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flutter / third_party / libjpeg-turbo / cf888486d10e3888bacac9c193c607f051042802 / . / simd / jsimd_arm64_neon.S
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/*
* ARMv8 NEON optimizations for libjpeg-turbo
*
* Copyright (C) 2009-2011 Nokia Corporation and/or its subsidiary(-ies).
* All rights reserved.
* Author: Siarhei Siamashka <siarhei.siamashka@nokia.com>
* Copyright (C) 2013-2014, Linaro Limited
* Author: Ragesh Radhakrishnan <ragesh.r@linaro.org>
* Copyright (C) 2014-2016, D. R. Commander. All Rights Reserved.
* Copyright (C) 2015-2016, Matthieu Darbois. All Rights Reserved.
* Copyright (C) 2016, Siarhei Siamashka. All Rights Reserved.
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event will the authors be held liable for any damages
* arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
*/
#if defined(__linux__) && defined(__ELF__)
.section .note.GNU-stack, "", %progbits /* mark stack as non-executable */
#endif
.text
#define RESPECT_STRICT_ALIGNMENT 1
/*****************************************************************************/
/* Supplementary macro for setting function attributes */
.macro asm_function fname
#ifdef __APPLE__
.globl _\fname
_\fname:
#else
.global \fname
#ifdef __ELF__
.hidden \fname
.type \fname, %function
#endif
\fname:
#endif
.endm
/* Transpose elements of single 128 bit registers */
.macro transpose_single x0, x1, xi, xilen, literal
ins \xi\xilen[0], \x0\xilen[0]
ins \x1\xilen[0], \x0\xilen[1]
trn1 \x0\literal, \x0\literal, \x1\literal
trn2 \x1\literal, \xi\literal, \x1\literal
.endm
/* Transpose elements of 2 differnet registers */
.macro transpose x0, x1, xi, xilen, literal
mov \xi\xilen, \x0\xilen
trn1 \x0\literal, \x0\literal, \x1\literal
trn2 \x1\literal, \xi\literal, \x1\literal
.endm
/* Transpose a block of 4x4 coefficients in four 64-bit registers */
.macro transpose_4x4_32 x0, x0len, x1, x1len, x2, x2len, x3, x3len, xi, xilen
mov \xi\xilen, \x0\xilen
trn1 \x0\x0len, \x0\x0len, \x2\x2len
trn2 \x2\x2len, \xi\x0len, \x2\x2len
mov \xi\xilen, \x1\xilen
trn1 \x1\x1len, \x1\x1len, \x3\x3len
trn2 \x3\x3len, \xi\x1len, \x3\x3len
.endm
.macro transpose_4x4_16 x0, x0len, x1, x1len, x2, x2len, x3, x3len, xi, xilen
mov \xi\xilen, \x0\xilen
trn1 \x0\x0len, \x0\x0len, \x1\x1len
trn2 \x1\x2len, \xi\x0len, \x1\x2len
mov \xi\xilen, \x2\xilen
trn1 \x2\x2len, \x2\x2len, \x3\x3len
trn2 \x3\x2len, \xi\x1len, \x3\x3len
.endm
.macro transpose_4x4 x0, x1, x2, x3, x5
transpose_4x4_16 \x0, .4h, \x1, .4h, \x2, .4h, \x3, .4h, \x5, .16b
transpose_4x4_32 \x0, .2s, \x1, .2s, \x2, .2s, \x3, .2s, \x5, .16b
.endm
.macro transpose_8x8 l0, l1, l2, l3, l4, l5, l6, l7, t0, t1, t2, t3
trn1 \t0\().8h, \l0\().8h, \l1\().8h
trn1 \t1\().8h, \l2\().8h, \l3\().8h
trn1 \t2\().8h, \l4\().8h, \l5\().8h
trn1 \t3\().8h, \l6\().8h, \l7\().8h
trn2 \l1\().8h, \l0\().8h, \l1\().8h
trn2 \l3\().8h, \l2\().8h, \l3\().8h
trn2 \l5\().8h, \l4\().8h, \l5\().8h
trn2 \l7\().8h, \l6\().8h, \l7\().8h
trn1 \l4\().4s, \t2\().4s, \t3\().4s
trn2 \t3\().4s, \t2\().4s, \t3\().4s
trn1 \t2\().4s, \t0\().4s, \t1\().4s
trn2 \l2\().4s, \t0\().4s, \t1\().4s
trn1 \t0\().4s, \l1\().4s, \l3\().4s
trn2 \l3\().4s, \l1\().4s, \l3\().4s
trn2 \t1\().4s, \l5\().4s, \l7\().4s
trn1 \l5\().4s, \l5\().4s, \l7\().4s
trn2 \l6\().2d, \l2\().2d, \t3\().2d
trn1 \l0\().2d, \t2\().2d, \l4\().2d
trn1 \l1\().2d, \t0\().2d, \l5\().2d
trn2 \l7\().2d, \l3\().2d, \t1\().2d
trn1 \l2\().2d, \l2\().2d, \t3\().2d
trn2 \l4\().2d, \t2\().2d, \l4\().2d
trn1 \l3\().2d, \l3\().2d, \t1\().2d
trn2 \l5\().2d, \t0\().2d, \l5\().2d
.endm
#define CENTERJSAMPLE 128
/*****************************************************************************/
/*
* Perform dequantization and inverse DCT on one block of coefficients.
*
* GLOBAL(void)
* jsimd_idct_islow_neon (void * dct_table, JCOEFPTR coef_block,
* JSAMPARRAY output_buf, JDIMENSION output_col)
*/
#define CONST_BITS 13
#define PASS1_BITS 2
#define F_0_298 2446 /* FIX(0.298631336) */
#define F_0_390 3196 /* FIX(0.390180644) */
#define F_0_541 4433 /* FIX(0.541196100) */
#define F_0_765 6270 /* FIX(0.765366865) */
#define F_0_899 7373 /* FIX(0.899976223) */
#define F_1_175 9633 /* FIX(1.175875602) */
#define F_1_501 12299 /* FIX(1.501321110) */
#define F_1_847 15137 /* FIX(1.847759065) */
#define F_1_961 16069 /* FIX(1.961570560) */
#define F_2_053 16819 /* FIX(2.053119869) */
#define F_2_562 20995 /* FIX(2.562915447) */
#define F_3_072 25172 /* FIX(3.072711026) */
.balign 16
Ljsimd_idct_islow_neon_consts:
.short F_0_298
.short -F_0_390
.short F_0_541
.short F_0_765
.short - F_0_899
.short F_1_175
.short F_1_501
.short - F_1_847
.short - F_1_961
.short F_2_053
.short - F_2_562
.short F_3_072
.short 0 /* padding */
.short 0
.short 0
.short 0
#undef F_0_298
#undef F_0_390
#undef F_0_541
#undef F_0_765
#undef F_0_899
#undef F_1_175
#undef F_1_501
#undef F_1_847
#undef F_1_961
#undef F_2_053
#undef F_2_562
#undef F_3_072
#define XFIX_P_0_298 v0.h[0]
#define XFIX_N_0_390 v0.h[1]
#define XFIX_P_0_541 v0.h[2]
#define XFIX_P_0_765 v0.h[3]
#define XFIX_N_0_899 v0.h[4]
#define XFIX_P_1_175 v0.h[5]
#define XFIX_P_1_501 v0.h[6]
#define XFIX_N_1_847 v0.h[7]
#define XFIX_N_1_961 v1.h[0]
#define XFIX_P_2_053 v1.h[1]
#define XFIX_N_2_562 v1.h[2]
#define XFIX_P_3_072 v1.h[3]
asm_function jsimd_idct_islow_neon
DCT_TABLE .req x0
COEF_BLOCK .req x1
OUTPUT_BUF .req x2
OUTPUT_COL .req x3
TMP1 .req x0
TMP2 .req x1
TMP3 .req x9
TMP4 .req x10
TMP5 .req x11
TMP6 .req x12
TMP7 .req x13
TMP8 .req x14
sub sp, sp, #64
adr x15, Ljsimd_idct_islow_neon_consts
st1 {v8.8b, v9.8b, v10.8b, v11.8b}, [sp], #32
st1 {v12.8b, v13.8b, v14.8b, v15.8b}, [sp], #32
ld1 {v0.8h, v1.8h}, [x15]
ld1 {v2.8h, v3.8h, v4.8h, v5.8h}, [COEF_BLOCK], #64
ld1 {v18.8h, v19.8h, v20.8h, v21.8h}, [DCT_TABLE], #64
ld1 {v6.8h, v7.8h, v8.8h, v9.8h}, [COEF_BLOCK], #64
ld1 {v22.8h, v23.8h, v24.8h, v25.8h}, [DCT_TABLE], #64
cmeq v16.8h, v3.8h, #0
cmeq v26.8h, v4.8h, #0
cmeq v27.8h, v5.8h, #0
cmeq v28.8h, v6.8h, #0
cmeq v29.8h, v7.8h, #0
cmeq v30.8h, v8.8h, #0
cmeq v31.8h, v9.8h, #0
and v10.16b, v16.16b, v26.16b
and v11.16b, v27.16b, v28.16b
and v12.16b, v29.16b, v30.16b
and v13.16b, v31.16b, v10.16b
and v14.16b, v11.16b, v12.16b
mul v2.8h, v2.8h, v18.8h
and v15.16b, v13.16b, v14.16b
shl v10.8h, v2.8h, #(PASS1_BITS)
sqxtn v16.8b, v15.8h
mov TMP1, v16.d[0]
sub sp, sp, #64
mvn TMP2, TMP1
cbnz TMP2, 2f
/* case all AC coeffs are zeros */
dup v2.2d, v10.d[0]
dup v6.2d, v10.d[1]
mov v3.16b, v2.16b
mov v7.16b, v6.16b
mov v4.16b, v2.16b
mov v8.16b, v6.16b
mov v5.16b, v2.16b
mov v9.16b, v6.16b
1:
/* for this transpose, we should organise data like this:
* 00, 01, 02, 03, 40, 41, 42, 43
* 10, 11, 12, 13, 50, 51, 52, 53
* 20, 21, 22, 23, 60, 61, 62, 63
* 30, 31, 32, 33, 70, 71, 72, 73
* 04, 05, 06, 07, 44, 45, 46, 47
* 14, 15, 16, 17, 54, 55, 56, 57
* 24, 25, 26, 27, 64, 65, 66, 67
* 34, 35, 36, 37, 74, 75, 76, 77
*/
trn1 v28.8h, v2.8h, v3.8h
trn1 v29.8h, v4.8h, v5.8h
trn1 v30.8h, v6.8h, v7.8h
trn1 v31.8h, v8.8h, v9.8h
trn2 v16.8h, v2.8h, v3.8h
trn2 v17.8h, v4.8h, v5.8h
trn2 v18.8h, v6.8h, v7.8h
trn2 v19.8h, v8.8h, v9.8h
trn1 v2.4s, v28.4s, v29.4s
trn1 v6.4s, v30.4s, v31.4s
trn1 v3.4s, v16.4s, v17.4s
trn1 v7.4s, v18.4s, v19.4s
trn2 v4.4s, v28.4s, v29.4s
trn2 v8.4s, v30.4s, v31.4s
trn2 v5.4s, v16.4s, v17.4s
trn2 v9.4s, v18.4s, v19.4s
/* Even part: reverse the even part of the forward DCT. */
add v18.8h, v4.8h, v8.8h /* z2 + z3 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]) + DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]) */
add v22.8h, v2.8h, v6.8h /* z2 + z3 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]) + DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]) */
smull2 v19.4s, v18.8h, XFIX_P_0_541 /* z1h z1 = MULTIPLY(z2 + z3, FIX_0_541196100); */
sub v26.8h, v2.8h, v6.8h /* z2 - z3 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]) - DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]) */
smull v18.4s, v18.4h, XFIX_P_0_541 /* z1l z1 = MULTIPLY(z2 + z3, FIX_0_541196100); */
sshll2 v23.4s, v22.8h, #(CONST_BITS) /* tmp0h tmp0 = LEFT_SHIFT(z2 + z3, CONST_BITS); */
mov v21.16b, v19.16b /* tmp3 = z1 */
mov v20.16b, v18.16b /* tmp3 = z1 */
smlal2 v19.4s, v8.8h, XFIX_N_1_847 /* tmp2h tmp2 = z1 + MULTIPLY(z3, - FIX_1_847759065); */
smlal v18.4s, v8.4h, XFIX_N_1_847 /* tmp2l tmp2 = z1 + MULTIPLY(z3, - FIX_1_847759065); */
sshll2 v27.4s, v26.8h, #(CONST_BITS) /* tmp1h tmp1 = LEFT_SHIFT(z2 - z3, CONST_BITS); */
smlal2 v21.4s, v4.8h, XFIX_P_0_765 /* tmp3h tmp3 = z1 + MULTIPLY(z2, FIX_0_765366865); */
smlal v20.4s, v4.4h, XFIX_P_0_765 /* tmp3l tmp3 = z1 + MULTIPLY(z2, FIX_0_765366865); */
sshll v22.4s, v22.4h, #(CONST_BITS) /* tmp0l tmp0 = LEFT_SHIFT(z2 + z3, CONST_BITS); */
sshll v26.4s, v26.4h, #(CONST_BITS) /* tmp1l tmp1 = LEFT_SHIFT(z2 - z3, CONST_BITS); */
add v2.4s, v22.4s, v20.4s /* tmp10l tmp10 = tmp0 + tmp3; */
sub v6.4s, v22.4s, v20.4s /* tmp13l tmp13 = tmp0 - tmp3; */
add v8.4s, v26.4s, v18.4s /* tmp11l tmp11 = tmp1 + tmp2; */
sub v4.4s, v26.4s, v18.4s /* tmp12l tmp12 = tmp1 - tmp2; */
add v28.4s, v23.4s, v21.4s /* tmp10h tmp10 = tmp0 + tmp3; */
sub v31.4s, v23.4s, v21.4s /* tmp13h tmp13 = tmp0 - tmp3; */
add v29.4s, v27.4s, v19.4s /* tmp11h tmp11 = tmp1 + tmp2; */
sub v30.4s, v27.4s, v19.4s /* tmp12h tmp12 = tmp1 - tmp2; */
/* Odd part per figure 8; the matrix is unitary and hence its
* transpose is its inverse. i0..i3 are y7,y5,y3,y1 respectively.
*/
add v22.8h, v9.8h, v5.8h /* z3 = tmp0 + tmp2 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]) + DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]) */
add v24.8h, v7.8h, v3.8h /* z4 = tmp1 + tmp3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]) + DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]) */
add v18.8h, v9.8h, v3.8h /* z1 = tmp0 + tmp3 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]) + DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]) */
add v20.8h, v7.8h, v5.8h /* z2 = tmp1 + tmp2 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]) + DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]) */
add v26.8h, v22.8h, v24.8h /* z5 = z3 + z4 */
smull2 v11.4s, v9.8h, XFIX_P_0_298 /* tmp0 = MULTIPLY(tmp0, FIX_0_298631336) */
smull2 v13.4s, v7.8h, XFIX_P_2_053 /* tmp1 = MULTIPLY(tmp1, FIX_2_053119869) */
smull2 v15.4s, v5.8h, XFIX_P_3_072 /* tmp2 = MULTIPLY(tmp2, FIX_3_072711026) */
smull2 v17.4s, v3.8h, XFIX_P_1_501 /* tmp3 = MULTIPLY(tmp3, FIX_1_501321110) */
smull2 v27.4s, v26.8h, XFIX_P_1_175 /* z5h z5 = MULTIPLY(z3 + z4, FIX_1_175875602) */
smull2 v23.4s, v22.8h, XFIX_N_1_961 /* z3 = MULTIPLY(z3, - FIX_1_961570560) */
smull2 v25.4s, v24.8h, XFIX_N_0_390 /* z4 = MULTIPLY(z4, - FIX_0_390180644) */
smull2 v19.4s, v18.8h, XFIX_N_0_899 /* z1 = MULTIPLY(z1, - FIX_0_899976223) */
smull2 v21.4s, v20.8h, XFIX_N_2_562 /* z2 = MULTIPLY(z2, - FIX_2_562915447) */
smull v10.4s, v9.4h, XFIX_P_0_298 /* tmp0 = MULTIPLY(tmp0, FIX_0_298631336) */
smull v12.4s, v7.4h, XFIX_P_2_053 /* tmp1 = MULTIPLY(tmp1, FIX_2_053119869) */
smull v14.4s, v5.4h, XFIX_P_3_072 /* tmp2 = MULTIPLY(tmp2, FIX_3_072711026) */
smull v16.4s, v3.4h, XFIX_P_1_501 /* tmp3 = MULTIPLY(tmp3, FIX_1_501321110) */
smull v26.4s, v26.4h, XFIX_P_1_175 /* z5l z5 = MULTIPLY(z3 + z4, FIX_1_175875602) */
smull v22.4s, v22.4h, XFIX_N_1_961 /* z3 = MULTIPLY(z3, - FIX_1_961570560) */
smull v24.4s, v24.4h, XFIX_N_0_390 /* z4 = MULTIPLY(z4, - FIX_0_390180644) */
smull v18.4s, v18.4h, XFIX_N_0_899 /* z1 = MULTIPLY(z1, - FIX_0_899976223) */
smull v20.4s, v20.4h, XFIX_N_2_562 /* z2 = MULTIPLY(z2, - FIX_2_562915447) */
add v23.4s, v23.4s, v27.4s /* z3 += z5 */
add v22.4s, v22.4s, v26.4s /* z3 += z5 */
add v25.4s, v25.4s, v27.4s /* z4 += z5 */
add v24.4s, v24.4s, v26.4s /* z4 += z5 */
add v11.4s, v11.4s, v19.4s /* tmp0 += z1 */
add v10.4s, v10.4s, v18.4s /* tmp0 += z1 */
add v13.4s, v13.4s, v21.4s /* tmp1 += z2 */
add v12.4s, v12.4s, v20.4s /* tmp1 += z2 */
add v15.4s, v15.4s, v21.4s /* tmp2 += z2 */
add v14.4s, v14.4s, v20.4s /* tmp2 += z2 */
add v17.4s, v17.4s, v19.4s /* tmp3 += z1 */
add v16.4s, v16.4s, v18.4s /* tmp3 += z1 */
add v11.4s, v11.4s, v23.4s /* tmp0 += z3 */
add v10.4s, v10.4s, v22.4s /* tmp0 += z3 */
add v13.4s, v13.4s, v25.4s /* tmp1 += z4 */
add v12.4s, v12.4s, v24.4s /* tmp1 += z4 */
add v17.4s, v17.4s, v25.4s /* tmp3 += z4 */
add v16.4s, v16.4s, v24.4s /* tmp3 += z4 */
add v15.4s, v15.4s, v23.4s /* tmp2 += z3 */
add v14.4s, v14.4s, v22.4s /* tmp2 += z3 */
/* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */
add v18.4s, v2.4s, v16.4s /* tmp10 + tmp3 */
add v19.4s, v28.4s, v17.4s /* tmp10 + tmp3 */
sub v20.4s, v2.4s, v16.4s /* tmp10 - tmp3 */
sub v21.4s, v28.4s, v17.4s /* tmp10 - tmp3 */
add v22.4s, v8.4s, v14.4s /* tmp11 + tmp2 */
add v23.4s, v29.4s, v15.4s /* tmp11 + tmp2 */
sub v24.4s, v8.4s, v14.4s /* tmp11 - tmp2 */
sub v25.4s, v29.4s, v15.4s /* tmp11 - tmp2 */
add v26.4s, v4.4s, v12.4s /* tmp12 + tmp1 */
add v27.4s, v30.4s, v13.4s /* tmp12 + tmp1 */
sub v28.4s, v4.4s, v12.4s /* tmp12 - tmp1 */
sub v29.4s, v30.4s, v13.4s /* tmp12 - tmp1 */
add v14.4s, v6.4s, v10.4s /* tmp13 + tmp0 */
add v15.4s, v31.4s, v11.4s /* tmp13 + tmp0 */
sub v16.4s, v6.4s, v10.4s /* tmp13 - tmp0 */
sub v17.4s, v31.4s, v11.4s /* tmp13 - tmp0 */
shrn v2.4h, v18.4s, #16 /* wsptr[DCTSIZE*0] = (int) DESCALE(tmp10 + tmp3, CONST_BITS+PASS1_BITS+3) */
shrn v9.4h, v20.4s, #16 /* wsptr[DCTSIZE*7] = (int) DESCALE(tmp10 - tmp3, CONST_BITS+PASS1_BITS+3) */
shrn v3.4h, v22.4s, #16 /* wsptr[DCTSIZE*1] = (int) DESCALE(tmp11 + tmp2, CONST_BITS+PASS1_BITS+3) */
shrn v8.4h, v24.4s, #16 /* wsptr[DCTSIZE*6] = (int) DESCALE(tmp11 - tmp2, CONST_BITS+PASS1_BITS+3) */
shrn v4.4h, v26.4s, #16 /* wsptr[DCTSIZE*2] = (int) DESCALE(tmp12 + tmp1, CONST_BITS+PASS1_BITS+3) */
shrn v7.4h, v28.4s, #16 /* wsptr[DCTSIZE*5] = (int) DESCALE(tmp12 - tmp1, CONST_BITS+PASS1_BITS+3) */
shrn v5.4h, v14.4s, #16 /* wsptr[DCTSIZE*3] = (int) DESCALE(tmp13 + tmp0, CONST_BITS+PASS1_BITS+3) */
shrn v6.4h, v16.4s, #16 /* wsptr[DCTSIZE*4] = (int) DESCALE(tmp13 - tmp0, CONST_BITS+PASS1_BITS+3) */
shrn2 v2.8h, v19.4s, #16 /* wsptr[DCTSIZE*0] = (int) DESCALE(tmp10 + tmp3, CONST_BITS+PASS1_BITS+3) */
shrn2 v9.8h, v21.4s, #16 /* wsptr[DCTSIZE*7] = (int) DESCALE(tmp10 - tmp3, CONST_BITS+PASS1_BITS+3) */
shrn2 v3.8h, v23.4s, #16 /* wsptr[DCTSIZE*1] = (int) DESCALE(tmp11 + tmp2, CONST_BITS+PASS1_BITS+3) */
shrn2 v8.8h, v25.4s, #16 /* wsptr[DCTSIZE*6] = (int) DESCALE(tmp11 - tmp2, CONST_BITS+PASS1_BITS+3) */
shrn2 v4.8h, v27.4s, #16 /* wsptr[DCTSIZE*2] = (int) DESCALE(tmp12 + tmp1, CONST_BITS+PASS1_BITS+3) */
shrn2 v7.8h, v29.4s, #16 /* wsptr[DCTSIZE*5] = (int) DESCALE(tmp12 - tmp1, CONST_BITS+PASS1_BITS+3) */
shrn2 v5.8h, v15.4s, #16 /* wsptr[DCTSIZE*3] = (int) DESCALE(tmp13 + tmp0, CONST_BITS+PASS1_BITS+3) */
shrn2 v6.8h, v17.4s, #16 /* wsptr[DCTSIZE*4] = (int) DESCALE(tmp13 - tmp0, CONST_BITS+PASS1_BITS+3) */
movi v0.16b, #(CENTERJSAMPLE)
/* Prepare pointers (dual-issue with NEON instructions) */
ldp TMP1, TMP2, [OUTPUT_BUF], 16
sqrshrn v28.8b, v2.8h, #(CONST_BITS+PASS1_BITS+3-16)
ldp TMP3, TMP4, [OUTPUT_BUF], 16
sqrshrn v29.8b, v3.8h, #(CONST_BITS+PASS1_BITS+3-16)
add TMP1, TMP1, OUTPUT_COL
sqrshrn v30.8b, v4.8h, #(CONST_BITS+PASS1_BITS+3-16)
add TMP2, TMP2, OUTPUT_COL
sqrshrn v31.8b, v5.8h, #(CONST_BITS+PASS1_BITS+3-16)
add TMP3, TMP3, OUTPUT_COL
sqrshrn2 v28.16b, v6.8h, #(CONST_BITS+PASS1_BITS+3-16)
add TMP4, TMP4, OUTPUT_COL
sqrshrn2 v29.16b, v7.8h, #(CONST_BITS+PASS1_BITS+3-16)
ldp TMP5, TMP6, [OUTPUT_BUF], 16
sqrshrn2 v30.16b, v8.8h, #(CONST_BITS+PASS1_BITS+3-16)
ldp TMP7, TMP8, [OUTPUT_BUF], 16
sqrshrn2 v31.16b, v9.8h, #(CONST_BITS+PASS1_BITS+3-16)
add TMP5, TMP5, OUTPUT_COL
add v16.16b, v28.16b, v0.16b
add TMP6, TMP6, OUTPUT_COL
add v18.16b, v29.16b, v0.16b
add TMP7, TMP7, OUTPUT_COL
add v20.16b, v30.16b, v0.16b
add TMP8, TMP8, OUTPUT_COL
add v22.16b, v31.16b, v0.16b
/* Transpose the final 8-bit samples */
trn1 v28.16b, v16.16b, v18.16b
trn1 v30.16b, v20.16b, v22.16b
trn2 v29.16b, v16.16b, v18.16b
trn2 v31.16b, v20.16b, v22.16b
trn1 v16.8h, v28.8h, v30.8h
trn2 v18.8h, v28.8h, v30.8h
trn1 v20.8h, v29.8h, v31.8h
trn2 v22.8h, v29.8h, v31.8h
uzp1 v28.4s, v16.4s, v18.4s
uzp2 v30.4s, v16.4s, v18.4s
uzp1 v29.4s, v20.4s, v22.4s
uzp2 v31.4s, v20.4s, v22.4s
/* Store results to the output buffer */
st1 {v28.d}[0], [TMP1]
st1 {v29.d}[0], [TMP2]
st1 {v28.d}[1], [TMP3]
st1 {v29.d}[1], [TMP4]
st1 {v30.d}[0], [TMP5]
st1 {v31.d}[0], [TMP6]
st1 {v30.d}[1], [TMP7]
st1 {v31.d}[1], [TMP8]
ld1 {v8.8b, v9.8b, v10.8b, v11.8b}, [sp], #32
ld1 {v12.8b, v13.8b, v14.8b, v15.8b}, [sp], #32
blr x30
.balign 16
2:
mul v3.8h, v3.8h, v19.8h
mul v4.8h, v4.8h, v20.8h
mul v5.8h, v5.8h, v21.8h
add TMP4, xzr, TMP2, LSL #32
mul v6.8h, v6.8h, v22.8h
mul v7.8h, v7.8h, v23.8h
adds TMP3, xzr, TMP2, LSR #32
mul v8.8h, v8.8h, v24.8h
mul v9.8h, v9.8h, v25.8h
b.ne 3f
/* Right AC coef is zero */
dup v15.2d, v10.d[1]
/* Even part: reverse the even part of the forward DCT. */
add v18.4h, v4.4h, v8.4h /* z2 + z3 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]) + DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]) */
add v22.4h, v2.4h, v6.4h /* z2 + z3 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]) + DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]) */
sub v26.4h, v2.4h, v6.4h /* z2 - z3 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]) - DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]) */
smull v18.4s, v18.4h, XFIX_P_0_541 /* z1l z1 = MULTIPLY(z2 + z3, FIX_0_541196100); */
sshll v22.4s, v22.4h, #(CONST_BITS) /* tmp0l tmp0 = LEFT_SHIFT(z2 + z3, CONST_BITS); */
mov v20.16b, v18.16b /* tmp3 = z1 */
sshll v26.4s, v26.4h, #(CONST_BITS) /* tmp1l tmp1 = LEFT_SHIFT(z2 - z3, CONST_BITS); */
smlal v18.4s, v8.4h, XFIX_N_1_847 /* tmp2l tmp2 = z1 + MULTIPLY(z3, - FIX_1_847759065); */
smlal v20.4s, v4.4h, XFIX_P_0_765 /* tmp3l tmp3 = z1 + MULTIPLY(z2, FIX_0_765366865); */
add v2.4s, v22.4s, v20.4s /* tmp10l tmp10 = tmp0 + tmp3; */
sub v6.4s, v22.4s, v20.4s /* tmp13l tmp13 = tmp0 - tmp3; */
add v8.4s, v26.4s, v18.4s /* tmp11l tmp11 = tmp1 + tmp2; */
sub v4.4s, v26.4s, v18.4s /* tmp12l tmp12 = tmp1 - tmp2; */
/* Odd part per figure 8; the matrix is unitary and hence its
* transpose is its inverse. i0..i3 are y7,y5,y3,y1 respectively.
*/
add v22.4h, v9.4h, v5.4h /* z3 = tmp0 + tmp2 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]) + DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]) */
add v24.4h, v7.4h, v3.4h /* z4 = tmp1 + tmp3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]) + DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]) */
add v18.4h, v9.4h, v3.4h /* z1 = tmp0 + tmp3 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]) + DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]) */
add v20.4h, v7.4h, v5.4h /* z2 = tmp1 + tmp2 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]) + DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]) */
add v26.4h, v22.4h, v24.4h /* z5 = z3 + z4 */
smull v10.4s, v9.4h, XFIX_P_0_298 /* tmp0 = MULTIPLY(tmp0, FIX_0_298631336) */
smull v12.4s, v7.4h, XFIX_P_2_053 /* tmp1 = MULTIPLY(tmp1, FIX_2_053119869) */
smull v14.4s, v5.4h, XFIX_P_3_072 /* tmp2 = MULTIPLY(tmp2, FIX_3_072711026) */
smull v16.4s, v3.4h, XFIX_P_1_501 /* tmp3 = MULTIPLY(tmp3, FIX_1_501321110) */
smull v26.4s, v26.4h, XFIX_P_1_175 /* z5l z5 = MULTIPLY(z3 + z4, FIX_1_175875602) */
smull v22.4s, v22.4h, XFIX_N_1_961 /* z3 = MULTIPLY(z3, - FIX_1_961570560) */
smull v24.4s, v24.4h, XFIX_N_0_390 /* z4 = MULTIPLY(z4, - FIX_0_390180644) */
smull v18.4s, v18.4h, XFIX_N_0_899 /* z1 = MULTIPLY(z1, - FIX_0_899976223) */
smull v20.4s, v20.4h, XFIX_N_2_562 /* z2 = MULTIPLY(z2, - FIX_2_562915447) */
add v22.4s, v22.4s, v26.4s /* z3 += z5 */
add v24.4s, v24.4s, v26.4s /* z4 += z5 */
add v10.4s, v10.4s, v18.4s /* tmp0 += z1 */
add v12.4s, v12.4s, v20.4s /* tmp1 += z2 */
add v14.4s, v14.4s, v20.4s /* tmp2 += z2 */
add v16.4s, v16.4s, v18.4s /* tmp3 += z1 */
add v10.4s, v10.4s, v22.4s /* tmp0 += z3 */
add v12.4s, v12.4s, v24.4s /* tmp1 += z4 */
add v16.4s, v16.4s, v24.4s /* tmp3 += z4 */
add v14.4s, v14.4s, v22.4s /* tmp2 += z3 */
/* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */
add v18.4s, v2.4s, v16.4s /* tmp10 + tmp3 */
sub v20.4s, v2.4s, v16.4s /* tmp10 - tmp3 */
add v22.4s, v8.4s, v14.4s /* tmp11 + tmp2 */
sub v24.4s, v8.4s, v14.4s /* tmp11 - tmp2 */
add v26.4s, v4.4s, v12.4s /* tmp12 + tmp1 */
sub v28.4s, v4.4s, v12.4s /* tmp12 - tmp1 */
add v14.4s, v6.4s, v10.4s /* tmp13 + tmp0 */
sub v16.4s, v6.4s, v10.4s /* tmp13 - tmp0 */
rshrn v2.4h, v18.4s, #(CONST_BITS-PASS1_BITS) /* wsptr[DCTSIZE*0] = (int) DESCALE(tmp10 + tmp3, CONST_BITS-PASS1_BITS) */
rshrn v3.4h, v22.4s, #(CONST_BITS-PASS1_BITS) /* wsptr[DCTSIZE*1] = (int) DESCALE(tmp11 + tmp2, CONST_BITS-PASS1_BITS) */
rshrn v4.4h, v26.4s, #(CONST_BITS-PASS1_BITS) /* wsptr[DCTSIZE*2] = (int) DESCALE(tmp12 + tmp1, CONST_BITS-PASS1_BITS) */
rshrn v5.4h, v14.4s, #(CONST_BITS-PASS1_BITS) /* wsptr[DCTSIZE*3] = (int) DESCALE(tmp13 + tmp0, CONST_BITS-PASS1_BITS) */
rshrn2 v2.8h, v16.4s, #(CONST_BITS-PASS1_BITS) /* wsptr[DCTSIZE*4] = (int) DESCALE(tmp13 - tmp0, CONST_BITS-PASS1_BITS) */
rshrn2 v3.8h, v28.4s, #(CONST_BITS-PASS1_BITS) /* wsptr[DCTSIZE*5] = (int) DESCALE(tmp12 - tmp1, CONST_BITS-PASS1_BITS) */
rshrn2 v4.8h, v24.4s, #(CONST_BITS-PASS1_BITS) /* wsptr[DCTSIZE*6] = (int) DESCALE(tmp11 - tmp2, CONST_BITS-PASS1_BITS) */
rshrn2 v5.8h, v20.4s, #(CONST_BITS-PASS1_BITS) /* wsptr[DCTSIZE*7] = (int) DESCALE(tmp10 - tmp3, CONST_BITS-PASS1_BITS) */
mov v6.16b, v15.16b
mov v7.16b, v15.16b
mov v8.16b, v15.16b
mov v9.16b, v15.16b
b 1b
.balign 16
3:
cbnz TMP4, 4f
/* Left AC coef is zero */
dup v14.2d, v10.d[0]
/* Even part: reverse the even part of the forward DCT. */
add v18.8h, v4.8h, v8.8h /* z2 + z3 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]) + DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]) */
add v22.8h, v2.8h, v6.8h /* z2 + z3 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]) + DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]) */
smull2 v19.4s, v18.8h, XFIX_P_0_541 /* z1h z1 = MULTIPLY(z2 + z3, FIX_0_541196100); */
sub v26.8h, v2.8h, v6.8h /* z2 - z3 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]) - DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]) */
sshll2 v23.4s, v22.8h, #(CONST_BITS) /* tmp0h tmp0 = LEFT_SHIFT(z2 + z3, CONST_BITS); */
mov v21.16b, v19.16b /* tmp3 = z1 */
smlal2 v19.4s, v8.8h, XFIX_N_1_847 /* tmp2h tmp2 = z1 + MULTIPLY(z3, - FIX_1_847759065); */
sshll2 v27.4s, v26.8h, #(CONST_BITS) /* tmp1h tmp1 = LEFT_SHIFT(z2 - z3, CONST_BITS); */
smlal2 v21.4s, v4.8h, XFIX_P_0_765 /* tmp3h tmp3 = z1 + MULTIPLY(z2, FIX_0_765366865); */
add v28.4s, v23.4s, v21.4s /* tmp10h tmp10 = tmp0 + tmp3; */
sub v31.4s, v23.4s, v21.4s /* tmp13h tmp13 = tmp0 - tmp3; */
add v29.4s, v27.4s, v19.4s /* tmp11h tmp11 = tmp1 + tmp2; */
sub v30.4s, v27.4s, v19.4s /* tmp12h tmp12 = tmp1 - tmp2; */
/* Odd part per figure 8; the matrix is unitary and hence its
* transpose is its inverse. i0..i3 are y7,y5,y3,y1 respectively.
*/
add v22.8h, v9.8h, v5.8h /* z3 = tmp0 + tmp2 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]) + DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]) */
add v24.8h, v7.8h, v3.8h /* z4 = tmp1 + tmp3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]) + DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]) */
add v18.8h, v9.8h, v3.8h /* z1 = tmp0 + tmp3 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]) + DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]) */
add v20.8h, v7.8h, v5.8h /* z2 = tmp1 + tmp2 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]) + DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]) */
add v26.8h, v22.8h, v24.8h /* z5 = z3 + z4 */
smull2 v11.4s, v9.8h, XFIX_P_0_298 /* tmp0 = MULTIPLY(tmp0, FIX_0_298631336) */
smull2 v13.4s, v7.8h, XFIX_P_2_053 /* tmp1 = MULTIPLY(tmp1, FIX_2_053119869) */
smull2 v15.4s, v5.8h, XFIX_P_3_072 /* tmp2 = MULTIPLY(tmp2, FIX_3_072711026) */
smull2 v17.4s, v3.8h, XFIX_P_1_501 /* tmp3 = MULTIPLY(tmp3, FIX_1_501321110) */
smull2 v27.4s, v26.8h, XFIX_P_1_175 /* z5h z5 = MULTIPLY(z3 + z4, FIX_1_175875602) */
smull2 v23.4s, v22.8h, XFIX_N_1_961 /* z3 = MULTIPLY(z3, - FIX_1_961570560) */
smull2 v25.4s, v24.8h, XFIX_N_0_390 /* z4 = MULTIPLY(z4, - FIX_0_390180644) */
smull2 v19.4s, v18.8h, XFIX_N_0_899 /* z1 = MULTIPLY(z1, - FIX_0_899976223) */
smull2 v21.4s, v20.8h, XFIX_N_2_562 /* z2 = MULTIPLY(z2, - FIX_2_562915447) */
add v23.4s, v23.4s, v27.4s /* z3 += z5 */
add v22.4s, v22.4s, v26.4s /* z3 += z5 */
add v25.4s, v25.4s, v27.4s /* z4 += z5 */
add v24.4s, v24.4s, v26.4s /* z4 += z5 */
add v11.4s, v11.4s, v19.4s /* tmp0 += z1 */
add v13.4s, v13.4s, v21.4s /* tmp1 += z2 */
add v15.4s, v15.4s, v21.4s /* tmp2 += z2 */
add v17.4s, v17.4s, v19.4s /* tmp3 += z1 */
add v11.4s, v11.4s, v23.4s /* tmp0 += z3 */
add v13.4s, v13.4s, v25.4s /* tmp1 += z4 */
add v17.4s, v17.4s, v25.4s /* tmp3 += z4 */
add v15.4s, v15.4s, v23.4s /* tmp2 += z3 */
/* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */
add v19.4s, v28.4s, v17.4s /* tmp10 + tmp3 */
sub v21.4s, v28.4s, v17.4s /* tmp10 - tmp3 */
add v23.4s, v29.4s, v15.4s /* tmp11 + tmp2 */
sub v25.4s, v29.4s, v15.4s /* tmp11 - tmp2 */
add v27.4s, v30.4s, v13.4s /* tmp12 + tmp1 */
sub v29.4s, v30.4s, v13.4s /* tmp12 - tmp1 */
add v15.4s, v31.4s, v11.4s /* tmp13 + tmp0 */
sub v17.4s, v31.4s, v11.4s /* tmp13 - tmp0 */
mov v2.16b, v14.16b
mov v3.16b, v14.16b
mov v4.16b, v14.16b
mov v5.16b, v14.16b
rshrn v6.4h, v19.4s, #(CONST_BITS-PASS1_BITS) /* wsptr[DCTSIZE*0] = (int) DESCALE(tmp10 + tmp3, CONST_BITS-PASS1_BITS) */
rshrn v7.4h, v23.4s, #(CONST_BITS-PASS1_BITS) /* wsptr[DCTSIZE*1] = (int) DESCALE(tmp11 + tmp2, CONST_BITS-PASS1_BITS) */
rshrn v8.4h, v27.4s, #(CONST_BITS-PASS1_BITS) /* wsptr[DCTSIZE*2] = (int) DESCALE(tmp12 + tmp1, CONST_BITS-PASS1_BITS) */
rshrn v9.4h, v15.4s, #(CONST_BITS-PASS1_BITS) /* wsptr[DCTSIZE*3] = (int) DESCALE(tmp13 + tmp0, CONST_BITS-PASS1_BITS) */
rshrn2 v6.8h, v17.4s, #(CONST_BITS-PASS1_BITS) /* wsptr[DCTSIZE*4] = (int) DESCALE(tmp13 - tmp0, CONST_BITS-PASS1_BITS) */
rshrn2 v7.8h, v29.4s, #(CONST_BITS-PASS1_BITS) /* wsptr[DCTSIZE*5] = (int) DESCALE(tmp12 - tmp1, CONST_BITS-PASS1_BITS) */
rshrn2 v8.8h, v25.4s, #(CONST_BITS-PASS1_BITS) /* wsptr[DCTSIZE*6] = (int) DESCALE(tmp11 - tmp2, CONST_BITS-PASS1_BITS) */
rshrn2 v9.8h, v21.4s, #(CONST_BITS-PASS1_BITS) /* wsptr[DCTSIZE*7] = (int) DESCALE(tmp10 - tmp3, CONST_BITS-PASS1_BITS) */
b 1b
.balign 16
4:
/* "No" AC coef is zero */
/* Even part: reverse the even part of the forward DCT. */
add v18.8h, v4.8h, v8.8h /* z2 + z3 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]) + DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]) */
add v22.8h, v2.8h, v6.8h /* z2 + z3 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]) + DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]) */
smull2 v19.4s, v18.8h, XFIX_P_0_541 /* z1h z1 = MULTIPLY(z2 + z3, FIX_0_541196100); */
sub v26.8h, v2.8h, v6.8h /* z2 - z3 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]) - DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]) */
smull v18.4s, v18.4h, XFIX_P_0_541 /* z1l z1 = MULTIPLY(z2 + z3, FIX_0_541196100); */
sshll2 v23.4s, v22.8h, #(CONST_BITS) /* tmp0h tmp0 = LEFT_SHIFT(z2 + z3, CONST_BITS); */
mov v21.16b, v19.16b /* tmp3 = z1 */
mov v20.16b, v18.16b /* tmp3 = z1 */
smlal2 v19.4s, v8.8h, XFIX_N_1_847 /* tmp2h tmp2 = z1 + MULTIPLY(z3, - FIX_1_847759065); */
smlal v18.4s, v8.4h, XFIX_N_1_847 /* tmp2l tmp2 = z1 + MULTIPLY(z3, - FIX_1_847759065); */
sshll2 v27.4s, v26.8h, #(CONST_BITS) /* tmp1h tmp1 = LEFT_SHIFT(z2 - z3, CONST_BITS); */
smlal2 v21.4s, v4.8h, XFIX_P_0_765 /* tmp3h tmp3 = z1 + MULTIPLY(z2, FIX_0_765366865); */
smlal v20.4s, v4.4h, XFIX_P_0_765 /* tmp3l tmp3 = z1 + MULTIPLY(z2, FIX_0_765366865); */
sshll v22.4s, v22.4h, #(CONST_BITS) /* tmp0l tmp0 = LEFT_SHIFT(z2 + z3, CONST_BITS); */
sshll v26.4s, v26.4h, #(CONST_BITS) /* tmp1l tmp1 = LEFT_SHIFT(z2 - z3, CONST_BITS); */
add v2.4s, v22.4s, v20.4s /* tmp10l tmp10 = tmp0 + tmp3; */
sub v6.4s, v22.4s, v20.4s /* tmp13l tmp13 = tmp0 - tmp3; */
add v8.4s, v26.4s, v18.4s /* tmp11l tmp11 = tmp1 + tmp2; */
sub v4.4s, v26.4s, v18.4s /* tmp12l tmp12 = tmp1 - tmp2; */
add v28.4s, v23.4s, v21.4s /* tmp10h tmp10 = tmp0 + tmp3; */
sub v31.4s, v23.4s, v21.4s /* tmp13h tmp13 = tmp0 - tmp3; */
add v29.4s, v27.4s, v19.4s /* tmp11h tmp11 = tmp1 + tmp2; */
sub v30.4s, v27.4s, v19.4s /* tmp12h tmp12 = tmp1 - tmp2; */
/* Odd part per figure 8; the matrix is unitary and hence its
* transpose is its inverse. i0..i3 are y7,y5,y3,y1 respectively.
*/
add v22.8h, v9.8h, v5.8h /* z3 = tmp0 + tmp2 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]) + DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]) */
add v24.8h, v7.8h, v3.8h /* z4 = tmp1 + tmp3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]) + DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]) */
add v18.8h, v9.8h, v3.8h /* z1 = tmp0 + tmp3 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]) + DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]) */
add v20.8h, v7.8h, v5.8h /* z2 = tmp1 + tmp2 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]) + DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]) */
add v26.8h, v22.8h, v24.8h /* z5 = z3 + z4 */
smull2 v11.4s, v9.8h, XFIX_P_0_298 /* tmp0 = MULTIPLY(tmp0, FIX_0_298631336) */
smull2 v13.4s, v7.8h, XFIX_P_2_053 /* tmp1 = MULTIPLY(tmp1, FIX_2_053119869) */
smull2 v15.4s, v5.8h, XFIX_P_3_072 /* tmp2 = MULTIPLY(tmp2, FIX_3_072711026) */
smull2 v17.4s, v3.8h, XFIX_P_1_501 /* tmp3 = MULTIPLY(tmp3, FIX_1_501321110) */
smull2 v27.4s, v26.8h, XFIX_P_1_175 /* z5h z5 = MULTIPLY(z3 + z4, FIX_1_175875602) */
smull2 v23.4s, v22.8h, XFIX_N_1_961 /* z3 = MULTIPLY(z3, - FIX_1_961570560) */
smull2 v25.4s, v24.8h, XFIX_N_0_390 /* z4 = MULTIPLY(z4, - FIX_0_390180644) */
smull2 v19.4s, v18.8h, XFIX_N_0_899 /* z1 = MULTIPLY(z1, - FIX_0_899976223) */
smull2 v21.4s, v20.8h, XFIX_N_2_562 /* z2 = MULTIPLY(z2, - FIX_2_562915447) */
smull v10.4s, v9.4h, XFIX_P_0_298 /* tmp0 = MULTIPLY(tmp0, FIX_0_298631336) */
smull v12.4s, v7.4h, XFIX_P_2_053 /* tmp1 = MULTIPLY(tmp1, FIX_2_053119869) */
smull v14.4s, v5.4h, XFIX_P_3_072 /* tmp2 = MULTIPLY(tmp2, FIX_3_072711026) */
smull v16.4s, v3.4h, XFIX_P_1_501 /* tmp3 = MULTIPLY(tmp3, FIX_1_501321110) */
smull v26.4s, v26.4h, XFIX_P_1_175 /* z5l z5 = MULTIPLY(z3 + z4, FIX_1_175875602) */
smull v22.4s, v22.4h, XFIX_N_1_961 /* z3 = MULTIPLY(z3, - FIX_1_961570560) */
smull v24.4s, v24.4h, XFIX_N_0_390 /* z4 = MULTIPLY(z4, - FIX_0_390180644) */
smull v18.4s, v18.4h, XFIX_N_0_899 /* z1 = MULTIPLY(z1, - FIX_0_899976223) */
smull v20.4s, v20.4h, XFIX_N_2_562 /* z2 = MULTIPLY(z2, - FIX_2_562915447) */
add v23.4s, v23.4s, v27.4s /* z3 += z5 */
add v22.4s, v22.4s, v26.4s /* z3 += z5 */
add v25.4s, v25.4s, v27.4s /* z4 += z5 */
add v24.4s, v24.4s, v26.4s /* z4 += z5 */
add v11.4s, v11.4s, v19.4s /* tmp0 += z1 */
add v10.4s, v10.4s, v18.4s /* tmp0 += z1 */
add v13.4s, v13.4s, v21.4s /* tmp1 += z2 */
add v12.4s, v12.4s, v20.4s /* tmp1 += z2 */
add v15.4s, v15.4s, v21.4s /* tmp2 += z2 */
add v14.4s, v14.4s, v20.4s /* tmp2 += z2 */
add v17.4s, v17.4s, v19.4s /* tmp3 += z1 */
add v16.4s, v16.4s, v18.4s /* tmp3 += z1 */
add v11.4s, v11.4s, v23.4s /* tmp0 += z3 */
add v10.4s, v10.4s, v22.4s /* tmp0 += z3 */
add v13.4s, v13.4s, v25.4s /* tmp1 += z4 */
add v12.4s, v12.4s, v24.4s /* tmp1 += z4 */
add v17.4s, v17.4s, v25.4s /* tmp3 += z4 */
add v16.4s, v16.4s, v24.4s /* tmp3 += z4 */
add v15.4s, v15.4s, v23.4s /* tmp2 += z3 */
add v14.4s, v14.4s, v22.4s /* tmp2 += z3 */
/* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */
add v18.4s, v2.4s, v16.4s /* tmp10 + tmp3 */
add v19.4s, v28.4s, v17.4s /* tmp10 + tmp3 */
sub v20.4s, v2.4s, v16.4s /* tmp10 - tmp3 */
sub v21.4s, v28.4s, v17.4s /* tmp10 - tmp3 */
add v22.4s, v8.4s, v14.4s /* tmp11 + tmp2 */
add v23.4s, v29.4s, v15.4s /* tmp11 + tmp2 */
sub v24.4s, v8.4s, v14.4s /* tmp11 - tmp2 */
sub v25.4s, v29.4s, v15.4s /* tmp11 - tmp2 */
add v26.4s, v4.4s, v12.4s /* tmp12 + tmp1 */
add v27.4s, v30.4s, v13.4s /* tmp12 + tmp1 */
sub v28.4s, v4.4s, v12.4s /* tmp12 - tmp1 */
sub v29.4s, v30.4s, v13.4s /* tmp12 - tmp1 */
add v14.4s, v6.4s, v10.4s /* tmp13 + tmp0 */
add v15.4s, v31.4s, v11.4s /* tmp13 + tmp0 */
sub v16.4s, v6.4s, v10.4s /* tmp13 - tmp0 */
sub v17.4s, v31.4s, v11.4s /* tmp13 - tmp0 */
rshrn v2.4h, v18.4s, #(CONST_BITS-PASS1_BITS) /* wsptr[DCTSIZE*0] = (int) DESCALE(tmp10 + tmp3, CONST_BITS-PASS1_BITS) */
rshrn v3.4h, v22.4s, #(CONST_BITS-PASS1_BITS) /* wsptr[DCTSIZE*1] = (int) DESCALE(tmp11 + tmp2, CONST_BITS-PASS1_BITS) */
rshrn v4.4h, v26.4s, #(CONST_BITS-PASS1_BITS) /* wsptr[DCTSIZE*2] = (int) DESCALE(tmp12 + tmp1, CONST_BITS-PASS1_BITS) */
rshrn v5.4h, v14.4s, #(CONST_BITS-PASS1_BITS) /* wsptr[DCTSIZE*3] = (int) DESCALE(tmp13 + tmp0, CONST_BITS-PASS1_BITS) */
rshrn v6.4h, v19.4s, #(CONST_BITS-PASS1_BITS) /* wsptr[DCTSIZE*0] = (int) DESCALE(tmp10 + tmp3, CONST_BITS-PASS1_BITS) */
rshrn v7.4h, v23.4s, #(CONST_BITS-PASS1_BITS) /* wsptr[DCTSIZE*1] = (int) DESCALE(tmp11 + tmp2, CONST_BITS-PASS1_BITS) */
rshrn v8.4h, v27.4s, #(CONST_BITS-PASS1_BITS) /* wsptr[DCTSIZE*2] = (int) DESCALE(tmp12 + tmp1, CONST_BITS-PASS1_BITS) */
rshrn v9.4h, v15.4s, #(CONST_BITS-PASS1_BITS) /* wsptr[DCTSIZE*3] = (int) DESCALE(tmp13 + tmp0, CONST_BITS-PASS1_BITS) */
rshrn2 v2.8h, v16.4s, #(CONST_BITS-PASS1_BITS) /* wsptr[DCTSIZE*4] = (int) DESCALE(tmp13 - tmp0, CONST_BITS-PASS1_BITS) */
rshrn2 v3.8h, v28.4s, #(CONST_BITS-PASS1_BITS) /* wsptr[DCTSIZE*5] = (int) DESCALE(tmp12 - tmp1, CONST_BITS-PASS1_BITS) */
rshrn2 v4.8h, v24.4s, #(CONST_BITS-PASS1_BITS) /* wsptr[DCTSIZE*6] = (int) DESCALE(tmp11 - tmp2, CONST_BITS-PASS1_BITS) */
rshrn2 v5.8h, v20.4s, #(CONST_BITS-PASS1_BITS) /* wsptr[DCTSIZE*7] = (int) DESCALE(tmp10 - tmp3, CONST_BITS-PASS1_BITS) */
rshrn2 v6.8h, v17.4s, #(CONST_BITS-PASS1_BITS) /* wsptr[DCTSIZE*4] = (int) DESCALE(tmp13 - tmp0, CONST_BITS-PASS1_BITS) */
rshrn2 v7.8h, v29.4s, #(CONST_BITS-PASS1_BITS) /* wsptr[DCTSIZE*5] = (int) DESCALE(tmp12 - tmp1, CONST_BITS-PASS1_BITS) */
rshrn2 v8.8h, v25.4s, #(CONST_BITS-PASS1_BITS) /* wsptr[DCTSIZE*6] = (int) DESCALE(tmp11 - tmp2, CONST_BITS-PASS1_BITS) */
rshrn2 v9.8h, v21.4s, #(CONST_BITS-PASS1_BITS) /* wsptr[DCTSIZE*7] = (int) DESCALE(tmp10 - tmp3, CONST_BITS-PASS1_BITS) */
b 1b
.unreq DCT_TABLE
.unreq COEF_BLOCK
.unreq OUTPUT_BUF
.unreq OUTPUT_COL
.unreq TMP1
.unreq TMP2
.unreq TMP3
.unreq TMP4
.unreq TMP5
.unreq TMP6
.unreq TMP7
.unreq TMP8
#undef CENTERJSAMPLE
#undef CONST_BITS
#undef PASS1_BITS
#undef XFIX_P_0_298
#undef XFIX_N_0_390
#undef XFIX_P_0_541
#undef XFIX_P_0_765
#undef XFIX_N_0_899
#undef XFIX_P_1_175
#undef XFIX_P_1_501
#undef XFIX_N_1_847
#undef XFIX_N_1_961
#undef XFIX_P_2_053
#undef XFIX_N_2_562
#undef XFIX_P_3_072
/*****************************************************************************/
/*
* jsimd_idct_ifast_neon
*
* This function contains a fast, not so accurate integer implementation of
* the inverse DCT (Discrete Cosine Transform). It uses the same calculations
* and produces exactly the same output as IJG's original 'jpeg_idct_ifast'
* function from jidctfst.c
*
* Normally 1-D AAN DCT needs 5 multiplications and 29 additions.
* But in ARM NEON case some extra additions are required because VQDMULH
* instruction can't handle the constants larger than 1. So the expressions
* like "x * 1.082392200" have to be converted to "x * 0.082392200 + x",
* which introduces an extra addition. Overall, there are 6 extra additions
* per 1-D IDCT pass, totalling to 5 VQDMULH and 35 VADD/VSUB instructions.
*/
#define XFIX_1_082392200 v0.h[0]
#define XFIX_1_414213562 v0.h[1]
#define XFIX_1_847759065 v0.h[2]
#define XFIX_2_613125930 v0.h[3]
.balign 16
Ljsimd_idct_ifast_neon_consts:
.short (277 * 128 - 256 * 128) /* XFIX_1_082392200 */
.short (362 * 128 - 256 * 128) /* XFIX_1_414213562 */
.short (473 * 128 - 256 * 128) /* XFIX_1_847759065 */
.short (669 * 128 - 512 * 128) /* XFIX_2_613125930 */
asm_function jsimd_idct_ifast_neon
DCT_TABLE .req x0
COEF_BLOCK .req x1
OUTPUT_BUF .req x2
OUTPUT_COL .req x3
TMP1 .req x0
TMP2 .req x1
TMP3 .req x9
TMP4 .req x10
TMP5 .req x11
TMP6 .req x12
TMP7 .req x13
TMP8 .req x14
/* Load and dequantize coefficients into NEON registers
* with the following allocation:
* 0 1 2 3 | 4 5 6 7
* ---------+--------
* 0 | d16 | d17 ( v16.8h )
* 1 | d18 | d19 ( v17.8h )
* 2 | d20 | d21 ( v18.8h )
* 3 | d22 | d23 ( v19.8h )
* 4 | d24 | d25 ( v20.8h )
* 5 | d26 | d27 ( v21.8h )
* 6 | d28 | d29 ( v22.8h )
* 7 | d30 | d31 ( v23.8h )
*/
/* Save NEON registers used in fast IDCT */
adr TMP5, Ljsimd_idct_ifast_neon_consts
ld1 {v16.8h, v17.8h}, [COEF_BLOCK], 32
ld1 {v0.8h, v1.8h}, [DCT_TABLE], 32
ld1 {v18.8h, v19.8h}, [COEF_BLOCK], 32
mul v16.8h, v16.8h, v0.8h
ld1 {v2.8h, v3.8h}, [DCT_TABLE], 32
mul v17.8h, v17.8h, v1.8h
ld1 {v20.8h, v21.8h}, [COEF_BLOCK], 32
mul v18.8h, v18.8h, v2.8h
ld1 {v0.8h, v1.8h}, [DCT_TABLE], 32
mul v19.8h, v19.8h, v3.8h
ld1 {v22.8h, v23.8h}, [COEF_BLOCK], 32
mul v20.8h, v20.8h, v0.8h
ld1 {v2.8h, v3.8h}, [DCT_TABLE], 32
mul v22.8h, v22.8h, v2.8h
mul v21.8h, v21.8h, v1.8h
ld1 {v0.4h}, [TMP5] /* load constants */
mul v23.8h, v23.8h, v3.8h
/* 1-D IDCT, pass 1 */
sub v2.8h, v18.8h, v22.8h
add v22.8h, v18.8h, v22.8h
sub v1.8h, v19.8h, v21.8h
add v21.8h, v19.8h, v21.8h
sub v5.8h, v17.8h, v23.8h
add v23.8h, v17.8h, v23.8h
sqdmulh v4.8h, v2.8h, XFIX_1_414213562
sqdmulh v6.8h, v1.8h, XFIX_2_613125930
add v3.8h, v1.8h, v1.8h
sub v1.8h, v5.8h, v1.8h
add v18.8h, v2.8h, v4.8h
sqdmulh v4.8h, v1.8h, XFIX_1_847759065
sub v2.8h, v23.8h, v21.8h
add v3.8h, v3.8h, v6.8h
sqdmulh v6.8h, v2.8h, XFIX_1_414213562
add v1.8h, v1.8h, v4.8h
sqdmulh v4.8h, v5.8h, XFIX_1_082392200
sub v18.8h, v18.8h, v22.8h
add v2.8h, v2.8h, v6.8h
sub v6.8h, v16.8h, v20.8h
add v20.8h, v16.8h, v20.8h
add v17.8h, v5.8h, v4.8h
add v5.8h, v6.8h, v18.8h
sub v18.8h, v6.8h, v18.8h
add v6.8h, v23.8h, v21.8h
add v16.8h, v20.8h, v22.8h
sub v3.8h, v6.8h, v3.8h
sub v20.8h, v20.8h, v22.8h
sub v3.8h, v3.8h, v1.8h
sub v1.8h, v17.8h, v1.8h
add v2.8h, v3.8h, v2.8h
sub v23.8h, v16.8h, v6.8h
add v1.8h, v1.8h, v2.8h
add v16.8h, v16.8h, v6.8h
add v22.8h, v5.8h, v3.8h
sub v17.8h, v5.8h, v3.8h
sub v21.8h, v18.8h, v2.8h
add v18.8h, v18.8h, v2.8h
sub v19.8h, v20.8h, v1.8h
add v20.8h, v20.8h, v1.8h
transpose_8x8 v16, v17, v18, v19, v20, v21, v22, v23, v28, v29, v30, v31
/* 1-D IDCT, pass 2 */
sub v2.8h, v18.8h, v22.8h
add v22.8h, v18.8h, v22.8h
sub v1.8h, v19.8h, v21.8h
add v21.8h, v19.8h, v21.8h
sub v5.8h, v17.8h, v23.8h
add v23.8h, v17.8h, v23.8h
sqdmulh v4.8h, v2.8h, XFIX_1_414213562
sqdmulh v6.8h, v1.8h, XFIX_2_613125930
add v3.8h, v1.8h, v1.8h
sub v1.8h, v5.8h, v1.8h
add v18.8h, v2.8h, v4.8h
sqdmulh v4.8h, v1.8h, XFIX_1_847759065
sub v2.8h, v23.8h, v21.8h
add v3.8h, v3.8h, v6.8h
sqdmulh v6.8h, v2.8h, XFIX_1_414213562
add v1.8h, v1.8h, v4.8h
sqdmulh v4.8h, v5.8h, XFIX_1_082392200
sub v18.8h, v18.8h, v22.8h
add v2.8h, v2.8h, v6.8h
sub v6.8h, v16.8h, v20.8h
add v20.8h, v16.8h, v20.8h
add v17.8h, v5.8h, v4.8h
add v5.8h, v6.8h, v18.8h
sub v18.8h, v6.8h, v18.8h
add v6.8h, v23.8h, v21.8h
add v16.8h, v20.8h, v22.8h
sub v3.8h, v6.8h, v3.8h
sub v20.8h, v20.8h, v22.8h
sub v3.8h, v3.8h, v1.8h
sub v1.8h, v17.8h, v1.8h
add v2.8h, v3.8h, v2.8h
sub v23.8h, v16.8h, v6.8h
add v1.8h, v1.8h, v2.8h
add v16.8h, v16.8h, v6.8h
add v22.8h, v5.8h, v3.8h
sub v17.8h, v5.8h, v3.8h
sub v21.8h, v18.8h, v2.8h
add v18.8h, v18.8h, v2.8h
sub v19.8h, v20.8h, v1.8h
add v20.8h, v20.8h, v1.8h
/* Descale to 8-bit and range limit */
movi v0.16b, #0x80
/* Prepare pointers (dual-issue with NEON instructions) */
ldp TMP1, TMP2, [OUTPUT_BUF], 16
sqshrn v28.8b, v16.8h, #5
ldp TMP3, TMP4, [OUTPUT_BUF], 16
sqshrn v29.8b, v17.8h, #5
add TMP1, TMP1, OUTPUT_COL
sqshrn v30.8b, v18.8h, #5
add TMP2, TMP2, OUTPUT_COL
sqshrn v31.8b, v19.8h, #5
add TMP3, TMP3, OUTPUT_COL
sqshrn2 v28.16b, v20.8h, #5
add TMP4, TMP4, OUTPUT_COL
sqshrn2 v29.16b, v21.8h, #5
ldp TMP5, TMP6, [OUTPUT_BUF], 16
sqshrn2 v30.16b, v22.8h, #5
ldp TMP7, TMP8, [OUTPUT_BUF], 16
sqshrn2 v31.16b, v23.8h, #5
add TMP5, TMP5, OUTPUT_COL
add v16.16b, v28.16b, v0.16b
add TMP6, TMP6, OUTPUT_COL
add v18.16b, v29.16b, v0.16b
add TMP7, TMP7, OUTPUT_COL
add v20.16b, v30.16b, v0.16b
add TMP8, TMP8, OUTPUT_COL
add v22.16b, v31.16b, v0.16b
/* Transpose the final 8-bit samples */
trn1 v28.16b, v16.16b, v18.16b
trn1 v30.16b, v20.16b, v22.16b
trn2 v29.16b, v16.16b, v18.16b
trn2 v31.16b, v20.16b, v22.16b
trn1 v16.8h, v28.8h, v30.8h
trn2 v18.8h, v28.8h, v30.8h
trn1 v20.8h, v29.8h, v31.8h
trn2 v22.8h, v29.8h, v31.8h
uzp1 v28.4s, v16.4s, v18.4s
uzp2 v30.4s, v16.4s, v18.4s
uzp1 v29.4s, v20.4s, v22.4s
uzp2 v31.4s, v20.4s, v22.4s
/* Store results to the output buffer */
st1 {v28.d}[0], [TMP1]
st1 {v29.d}[0], [TMP2]
st1 {v28.d}[1], [TMP3]
st1 {v29.d}[1], [TMP4]
st1 {v30.d}[0], [TMP5]
st1 {v31.d}[0], [TMP6]
st1 {v30.d}[1], [TMP7]
st1 {v31.d}[1], [TMP8]
blr x30
.unreq DCT_TABLE
.unreq COEF_BLOCK
.unreq OUTPUT_BUF
.unreq OUTPUT_COL
.unreq TMP1
.unreq TMP2
.unreq TMP3
.unreq TMP4
.unreq TMP5
.unreq TMP6
.unreq TMP7
.unreq TMP8
/*****************************************************************************/
/*
* jsimd_idct_4x4_neon
*
* This function contains inverse-DCT code for getting reduced-size
* 4x4 pixels output from an 8x8 DCT block. It uses the same calculations
* and produces exactly the same output as IJG's original 'jpeg_idct_4x4'
* function from jpeg-6b (jidctred.c).
*
* NOTE: jpeg-8 has an improved implementation of 4x4 inverse-DCT, which
* requires much less arithmetic operations and hence should be faster.
* The primary purpose of this particular NEON optimized function is
* bit exact compatibility with jpeg-6b.
*
* TODO: a bit better instructions scheduling can be achieved by expanding
* idct_helper/transpose_4x4 macros and reordering instructions,
* but readability will suffer somewhat.
*/
#define CONST_BITS 13
#define FIX_0_211164243 (1730) /* FIX(0.211164243) */
#define FIX_0_509795579 (4176) /* FIX(0.509795579) */
#define FIX_0_601344887 (4926) /* FIX(0.601344887) */
#define FIX_0_720959822 (5906) /* FIX(0.720959822) */
#define FIX_0_765366865 (6270) /* FIX(0.765366865) */
#define FIX_0_850430095 (6967) /* FIX(0.850430095) */
#define FIX_0_899976223 (7373) /* FIX(0.899976223) */
#define FIX_1_061594337 (8697) /* FIX(1.061594337) */
#define FIX_1_272758580 (10426) /* FIX(1.272758580) */
#define FIX_1_451774981 (11893) /* FIX(1.451774981) */
#define FIX_1_847759065 (15137) /* FIX(1.847759065) */
#define FIX_2_172734803 (17799) /* FIX(2.172734803) */
#define FIX_2_562915447 (20995) /* FIX(2.562915447) */
#define FIX_3_624509785 (29692) /* FIX(3.624509785) */
.balign 16
Ljsimd_idct_4x4_neon_consts:
.short FIX_1_847759065 /* v0.h[0] */
.short -FIX_0_765366865 /* v0.h[1] */
.short -FIX_0_211164243 /* v0.h[2] */
.short FIX_1_451774981 /* v0.h[3] */
.short -FIX_2_172734803 /* d1[0] */
.short FIX_1_061594337 /* d1[1] */
.short -FIX_0_509795579 /* d1[2] */
.short -FIX_0_601344887 /* d1[3] */
.short FIX_0_899976223 /* v2.h[0] */
.short FIX_2_562915447 /* v2.h[1] */
.short 1 << (CONST_BITS+1) /* v2.h[2] */
.short 0 /* v2.h[3] */
.macro idct_helper x4, x6, x8, x10, x12, x14, x16, shift, y26, y27, y28, y29
smull v28.4s, \x4, v2.h[2]
smlal v28.4s, \x8, v0.h[0]
smlal v28.4s, \x14, v0.h[1]
smull v26.4s, \x16, v1.h[2]
smlal v26.4s, \x12, v1.h[3]
smlal v26.4s, \x10, v2.h[0]
smlal v26.4s, \x6, v2.h[1]
smull v30.4s, \x4, v2.h[2]
smlsl v30.4s, \x8, v0.h[0]
smlsl v30.4s, \x14, v0.h[1]
smull v24.4s, \x16, v0.h[2]
smlal v24.4s, \x12, v0.h[3]
smlal v24.4s, \x10, v1.h[0]
smlal v24.4s, \x6, v1.h[1]
add v20.4s, v28.4s, v26.4s
sub v28.4s, v28.4s, v26.4s
.if \shift > 16
srshr v20.4s, v20.4s, #\shift
srshr v28.4s, v28.4s, #\shift
xtn \y26, v20.4s
xtn \y29, v28.4s
.else
rshrn \y26, v20.4s, #\shift
rshrn \y29, v28.4s, #\shift
.endif
add v20.4s, v30.4s, v24.4s
sub v30.4s, v30.4s, v24.4s
.if \shift > 16
srshr v20.4s, v20.4s, #\shift
srshr v30.4s, v30.4s, #\shift
xtn \y27, v20.4s
xtn \y28, v30.4s
.else
rshrn \y27, v20.4s, #\shift
rshrn \y28, v30.4s, #\shift
.endif
.endm
asm_function jsimd_idct_4x4_neon
DCT_TABLE .req x0
COEF_BLOCK .req x1
OUTPUT_BUF .req x2
OUTPUT_COL .req x3
TMP1 .req x0
TMP2 .req x1
TMP3 .req x2
TMP4 .req x15
/* Save all used NEON registers */
sub sp, sp, 272
str x15, [sp], 16
/* Load constants (v3.4h is just used for padding) */
adr TMP4, Ljsimd_idct_4x4_neon_consts
st1 {v0.8b, v1.8b, v2.8b, v3.8b}, [sp], 32
st1 {v4.8b, v5.8b, v6.8b, v7.8b}, [sp], 32
st1 {v8.8b, v9.8b, v10.8b, v11.8b}, [sp], 32
st1 {v12.8b, v13.8b, v14.8b, v15.8b}, [sp], 32
st1 {v16.8b, v17.8b, v18.8b, v19.8b}, [sp], 32
st1 {v20.8b, v21.8b, v22.8b, v23.8b}, [sp], 32
st1 {v24.8b, v25.8b, v26.8b, v27.8b}, [sp], 32
st1 {v28.8b, v29.8b, v30.8b, v31.8b}, [sp], 32
ld1 {v0.4h, v1.4h, v2.4h, v3.4h}, [TMP4]
/* Load all COEF_BLOCK into NEON registers with the following allocation:
* 0 1 2 3 | 4 5 6 7
* ---------+--------
* 0 | v4.4h | v5.4h
* 1 | v6.4h | v7.4h
* 2 | v8.4h | v9.4h
* 3 | v10.4h | v11.4h
* 4 | - | -
* 5 | v12.4h | v13.4h
* 6 | v14.4h | v15.4h
* 7 | v16.4h | v17.4h
*/
ld1 {v4.4h, v5.4h, v6.4h, v7.4h}, [COEF_BLOCK], 32
ld1 {v8.4h, v9.4h, v10.4h, v11.4h}, [COEF_BLOCK], 32
add COEF_BLOCK, COEF_BLOCK, #16
ld1 {v12.4h, v13.4h, v14.4h, v15.4h}, [COEF_BLOCK], 32
ld1 {v16.4h, v17.4h}, [COEF_BLOCK], 16
/* dequantize */
ld1 {v18.4h, v19.4h, v20.4h, v21.4h}, [DCT_TABLE], 32
mul v4.4h, v4.4h, v18.4h
mul v5.4h, v5.4h, v19.4h
ins v4.d[1], v5.d[0] /* 128 bit q4 */
ld1 {v22.4h, v23.4h, v24.4h, v25.4h}, [DCT_TABLE], 32
mul v6.4h, v6.4h, v20.4h
mul v7.4h, v7.4h, v21.4h
ins v6.d[1], v7.d[0] /* 128 bit q6 */
mul v8.4h, v8.4h, v22.4h
mul v9.4h, v9.4h, v23.4h
ins v8.d[1], v9.d[0] /* 128 bit q8 */
add DCT_TABLE, DCT_TABLE, #16
ld1 {v26.4h, v27.4h, v28.4h, v29.4h}, [DCT_TABLE], 32
mul v10.4h, v10.4h, v24.4h
mul v11.4h, v11.4h, v25.4h
ins v10.d[1], v11.d[0] /* 128 bit q10 */
mul v12.4h, v12.4h, v26.4h
mul v13.4h, v13.4h, v27.4h
ins v12.d[1], v13.d[0] /* 128 bit q12 */
ld1 {v30.4h, v31.4h}, [DCT_TABLE], 16
mul v14.4h, v14.4h, v28.4h
mul v15.4h, v15.4h, v29.4h
ins v14.d[1], v15.d[0] /* 128 bit q14 */
mul v16.4h, v16.4h, v30.4h
mul v17.4h, v17.4h, v31.4h
ins v16.d[1], v17.d[0] /* 128 bit q16 */
/* Pass 1 */
idct_helper v4.4h, v6.4h, v8.4h, v10.4h, v12.4h, v14.4h, v16.4h, 12, \
v4.4h, v6.4h, v8.4h, v10.4h
transpose_4x4 v4, v6, v8, v10, v3
ins v10.d[1], v11.d[0]
idct_helper v5.4h, v7.4h, v9.4h, v11.4h, v13.4h, v15.4h, v17.4h, 12, \
v5.4h, v7.4h, v9.4h, v11.4h
transpose_4x4 v5, v7, v9, v11, v3
ins v10.d[1], v11.d[0]
/* Pass 2 */
idct_helper v4.4h, v6.4h, v8.4h, v10.4h, v7.4h, v9.4h, v11.4h, 19, \
v26.4h, v27.4h, v28.4h, v29.4h
transpose_4x4 v26, v27, v28, v29, v3
/* Range limit */
movi v30.8h, #0x80
ins v26.d[1], v27.d[0]
ins v28.d[1], v29.d[0]
add v26.8h, v26.8h, v30.8h
add v28.8h, v28.8h, v30.8h
sqxtun v26.8b, v26.8h
sqxtun v27.8b, v28.8h
/* Store results to the output buffer */
ldp TMP1, TMP2, [OUTPUT_BUF], 16
ldp TMP3, TMP4, [OUTPUT_BUF]
add TMP1, TMP1, OUTPUT_COL
add TMP2, TMP2, OUTPUT_COL
add TMP3, TMP3, OUTPUT_COL
add TMP4, TMP4, OUTPUT_COL
#if defined(__ARMEL__) && !RESPECT_STRICT_ALIGNMENT
/* We can use much less instructions on little endian systems if the
* OS kernel is not configured to trap unaligned memory accesses
*/
st1 {v26.s}[0], [TMP1], 4
st1 {v27.s}[0], [TMP3], 4
st1 {v26.s}[1], [TMP2], 4
st1 {v27.s}[1], [TMP4], 4
#else
st1 {v26.b}[0], [TMP1], 1
st1 {v27.b}[0], [TMP3], 1
st1 {v26.b}[1], [TMP1], 1
st1 {v27.b}[1], [TMP3], 1
st1 {v26.b}[2], [TMP1], 1
st1 {v27.b}[2], [TMP3], 1
st1 {v26.b}[3], [TMP1], 1
st1 {v27.b}[3], [TMP3], 1
st1 {v26.b}[4], [TMP2], 1
st1 {v27.b}[4], [TMP4], 1
st1 {v26.b}[5], [TMP2], 1
st1 {v27.b}[5], [TMP4], 1
st1 {v26.b}[6], [TMP2], 1
st1 {v27.b}[6], [TMP4], 1
st1 {v26.b}[7], [TMP2], 1
st1 {v27.b}[7], [TMP4], 1
#endif
/* vpop {v8.4h - v15.4h} ;not available */
sub sp, sp, #272
ldr x15, [sp], 16
ld1 {v0.8b, v1.8b, v2.8b, v3.8b}, [sp], 32
ld1 {v4.8b, v5.8b, v6.8b, v7.8b}, [sp], 32
ld1 {v8.8b, v9.8b, v10.8b, v11.8b}, [sp], 32
ld1 {v12.8b, v13.8b, v14.8b, v15.8b}, [sp], 32
ld1 {v16.8b, v17.8b, v18.8b, v19.8b}, [sp], 32
ld1 {v20.8b, v21.8b, v22.8b, v23.8b}, [sp], 32
ld1 {v24.8b, v25.8b, v26.8b, v27.8b}, [sp], 32
ld1 {v28.8b, v29.8b, v30.8b, v31.8b}, [sp], 32
blr x30
.unreq DCT_TABLE
.unreq COEF_BLOCK
.unreq OUTPUT_BUF
.unreq OUTPUT_COL
.unreq TMP1
.unreq TMP2
.unreq TMP3
.unreq TMP4
.purgem idct_helper
/*****************************************************************************/
/*
* jsimd_idct_2x2_neon
*
* This function contains inverse-DCT code for getting reduced-size
* 2x2 pixels output from an 8x8 DCT block. It uses the same calculations
* and produces exactly the same output as IJG's original 'jpeg_idct_2x2'
* function from jpeg-6b (jidctred.c).
*
* NOTE: jpeg-8 has an improved implementation of 2x2 inverse-DCT, which
* requires much less arithmetic operations and hence should be faster.
* The primary purpose of this particular NEON optimized function is
* bit exact compatibility with jpeg-6b.
*/
.balign 8
Ljsimd_idct_2x2_neon_consts:
.short -FIX_0_720959822 /* v14[0] */
.short FIX_0_850430095 /* v14[1] */
.short -FIX_1_272758580 /* v14[2] */
.short FIX_3_624509785 /* v14[3] */
.macro idct_helper x4, x6, x10, x12, x16, shift, y26, y27
sshll v15.4s, \x4, #15
smull v26.4s, \x6, v14.h[3]
smlal v26.4s, \x10, v14.h[2]
smlal v26.4s, \x12, v14.h[1]
smlal v26.4s, \x16, v14.h[0]
add v20.4s, v15.4s, v26.4s
sub v15.4s, v15.4s, v26.4s
.if \shift > 16
srshr v20.4s, v20.4s, #\shift
srshr v15.4s, v15.4s, #\shift
xtn \y26, v20.4s
xtn \y27, v15.4s
.else
rshrn \y26, v20.4s, #\shift
rshrn \y27, v15.4s, #\shift
.endif
.endm
asm_function jsimd_idct_2x2_neon
DCT_TABLE .req x0
COEF_BLOCK .req x1
OUTPUT_BUF .req x2
OUTPUT_COL .req x3
TMP1 .req x0
TMP2 .req x15
/* vpush {v8.4h - v15.4h} ; not available */
sub sp, sp, 208
str x15, [sp], 16
/* Load constants */
adr TMP2, Ljsimd_idct_2x2_neon_consts
st1 {v4.8b, v5.8b, v6.8b, v7.8b}, [sp], 32
st1 {v8.8b, v9.8b, v10.8b, v11.8b}, [sp], 32
st1 {v12.8b, v13.8b, v14.8b, v15.8b}, [sp], 32
st1 {v16.8b, v17.8b, v18.8b, v19.8b}, [sp], 32
st1 {v21.8b, v22.8b}, [sp], 16
st1 {v24.8b, v25.8b, v26.8b, v27.8b}, [sp], 32
st1 {v30.8b, v31.8b}, [sp], 16
ld1 {v14.4h}, [TMP2]
/* Load all COEF_BLOCK into NEON registers with the following allocation:
* 0 1 2 3 | 4 5 6 7
* ---------+--------
* 0 | v4.4h | v5.4h
* 1 | v6.4h | v7.4h
* 2 | - | -
* 3 | v10.4h | v11.4h
* 4 | - | -
* 5 | v12.4h | v13.4h
* 6 | - | -
* 7 | v16.4h | v17.4h
*/
ld1 {v4.4h, v5.4h, v6.4h, v7.4h}, [COEF_BLOCK], 32
add COEF_BLOCK, COEF_BLOCK, #16
ld1 {v10.4h, v11.4h}, [COEF_BLOCK], 16
add COEF_BLOCK, COEF_BLOCK, #16
ld1 {v12.4h, v13.4h}, [COEF_BLOCK], 16
add COEF_BLOCK, COEF_BLOCK, #16
ld1 {v16.4h, v17.4h}, [COEF_BLOCK], 16
/* Dequantize */
ld1 {v18.4h, v19.4h, v20.4h, v21.4h}, [DCT_TABLE], 32
mul v4.4h, v4.4h, v18.4h
mul v5.4h, v5.4h, v19.4h
ins v4.d[1], v5.d[0]
mul v6.4h, v6.4h, v20.4h
mul v7.4h, v7.4h, v21.4h
ins v6.d[1], v7.d[0]
add DCT_TABLE, DCT_TABLE, #16
ld1 {v24.4h, v25.4h}, [DCT_TABLE], 16
mul v10.4h, v10.4h, v24.4h
mul v11.4h, v11.4h, v25.4h
ins v10.d[1], v11.d[0]
add DCT_TABLE, DCT_TABLE, #16
ld1 {v26.4h, v27.4h}, [DCT_TABLE], 16
mul v12.4h, v12.4h, v26.4h
mul v13.4h, v13.4h, v27.4h
ins v12.d[1], v13.d[0]
add DCT_TABLE, DCT_TABLE, #16
ld1 {v30.4h, v31.4h}, [DCT_TABLE], 16
mul v16.4h, v16.4h, v30.4h
mul v17.4h, v17.4h, v31.4h
ins v16.d[1], v17.d[0]
/* Pass 1 */
#if 0
idct_helper v4.4h, v6.4h, v10.4h, v12.4h, v16.4h, 13, v4.4h, v6.4h
transpose_4x4 v4.4h, v6.4h, v8.4h, v10.4h
idct_helper v5.4h, v7.4h, v11.4h, v13.4h, v17.4h, 13, v5.4h, v7.4h
transpose_4x4 v5.4h, v7.4h, v9.4h, v11.4h
#else
smull v26.4s, v6.4h, v14.h[3]
smlal v26.4s, v10.4h, v14.h[2]
smlal v26.4s, v12.4h, v14.h[1]
smlal v26.4s, v16.4h, v14.h[0]
smull v24.4s, v7.4h, v14.h[3]
smlal v24.4s, v11.4h, v14.h[2]
smlal v24.4s, v13.4h, v14.h[1]
smlal v24.4s, v17.4h, v14.h[0]
sshll v15.4s, v4.4h, #15
sshll v30.4s, v5.4h, #15
add v20.4s, v15.4s, v26.4s
sub v15.4s, v15.4s, v26.4s
rshrn v4.4h, v20.4s, #13
rshrn v6.4h, v15.4s, #13
add v20.4s, v30.4s, v24.4s
sub v15.4s, v30.4s, v24.4s
rshrn v5.4h, v20.4s, #13
rshrn v7.4h, v15.4s, #13
ins v4.d[1], v5.d[0]
ins v6.d[1], v7.d[0]
transpose v4, v6, v3, .16b, .8h
transpose v6, v10, v3, .16b, .4s
ins v11.d[0], v10.d[1]
ins v7.d[0], v6.d[1]
#endif
/* Pass 2 */
idct_helper v4.4h, v6.4h, v10.4h, v7.4h, v11.4h, 20, v26.4h, v27.4h
/* Range limit */
movi v30.8h, #0x80
ins v26.d[1], v27.d[0]
add v26.8h, v26.8h, v30.8h
sqxtun v30.8b, v26.8h
ins v26.d[0], v30.d[0]
sqxtun v27.8b, v26.8h
/* Store results to the output buffer */
ldp TMP1, TMP2, [OUTPUT_BUF]
add TMP1, TMP1, OUTPUT_COL
add TMP2, TMP2, OUTPUT_COL
st1 {v26.b}[0], [TMP1], 1
st1 {v27.b}[4], [TMP1], 1
st1 {v26.b}[1], [TMP2], 1
st1 {v27.b}[5], [TMP2], 1
sub sp, sp, #208
ldr x15, [sp], 16
ld1 {v4.8b, v5.8b, v6.8b, v7.8b}, [sp], 32
ld1 {v8.8b, v9.8b, v10.8b, v11.8b}, [sp], 32
ld1 {v12.8b, v13.8b, v14.8b, v15.8b}, [sp], 32
ld1 {v16.8b, v17.8b, v18.8b, v19.8b}, [sp], 32
ld1 {v21.8b, v22.8b}, [sp], 16
ld1 {v24.8b, v25.8b, v26.8b, v27.8b}, [sp], 32
ld1 {v30.8b, v31.8b}, [sp], 16
blr x30
.unreq DCT_TABLE
.unreq COEF_BLOCK
.unreq OUTPUT_BUF
.unreq OUTPUT_COL
.unreq TMP1
.unreq TMP2
.purgem idct_helper
/*****************************************************************************/
/*
* jsimd_ycc_extrgb_convert_neon
* jsimd_ycc_extbgr_convert_neon
* jsimd_ycc_extrgbx_convert_neon
* jsimd_ycc_extbgrx_convert_neon
* jsimd_ycc_extxbgr_convert_neon
* jsimd_ycc_extxrgb_convert_neon
*
* Colorspace conversion YCbCr -> RGB
*/
#if defined(__APPLE__) || defined(__ANDROID__)
/* TODO: expand this to include other devices that are known not to have a slow
* ld3 implementation. */
#define ST3_IS_FAST
#endif
.macro do_load size
.if \size == 8
ld1 {v4.8b}, [U], 8
ld1 {v5.8b}, [V], 8
ld1 {v0.8b}, [Y], 8
prfm pldl1keep, [U, #64]
prfm pldl1keep, [V, #64]
prfm pldl1keep, [Y, #64]
.elseif \size == 4
ld1 {v4.b}[0], [U], 1
ld1 {v4.b}[1], [U], 1
ld1 {v4.b}[2], [U], 1
ld1 {v4.b}[3], [U], 1
ld1 {v5.b}[0], [V], 1
ld1 {v5.b}[1], [V], 1
ld1 {v5.b}[2], [V], 1
ld1 {v5.b}[3], [V], 1
ld1 {v0.b}[0], [Y], 1
ld1 {v0.b}[1], [Y], 1
ld1 {v0.b}[2], [Y], 1
ld1 {v0.b}[3], [Y], 1
.elseif \size == 2
ld1 {v4.b}[4], [U], 1
ld1 {v4.b}[5], [U], 1
ld1 {v5.b}[4], [V], 1
ld1 {v5.b}[5], [V], 1
ld1 {v0.b}[4], [Y], 1
ld1 {v0.b}[5], [Y], 1
.elseif \size == 1
ld1 {v4.b}[6], [U], 1
ld1 {v5.b}[6], [V], 1
ld1 {v0.b}[6], [Y], 1
.else
.error unsupported macroblock size
.endif
.endm
.macro do_store bpp, size
.if \bpp == 24
.if \size == 8
#ifdef ST3_IS_FAST
st3 {v10.8b, v11.8b, v12.8b}, [RGB], 24
#else
st1 {v10.b}[0], [RGB], #1
st1 {v11.b}[0], [RGB], #1
st1 {v12.b}[0], [RGB], #1
st1 {v10.b}[1], [RGB], #1
st1 {v11.b}[1], [RGB], #1
st1 {v12.b}[1], [RGB], #1
st1 {v10.b}[2], [RGB], #1
st1 {v11.b}[2], [RGB], #1
st1 {v12.b}[2], [RGB], #1
st1 {v10.b}[3], [RGB], #1
st1 {v11.b}[3], [RGB], #1
st1 {v12.b}[3], [RGB], #1
st1 {v10.b}[4], [RGB], #1
st1 {v11.b}[4], [RGB], #1
st1 {v12.b}[4], [RGB], #1
st1 {v10.b}[5], [RGB], #1
st1 {v11.b}[5], [RGB], #1
st1 {v12.b}[5], [RGB], #1
st1 {v10.b}[6], [RGB], #1
st1 {v11.b}[6], [RGB], #1
st1 {v12.b}[6], [RGB], #1
st1 {v10.b}[7], [RGB], #1
st1 {v11.b}[7], [RGB], #1
st1 {v12.b}[7], [RGB], #1
#endif
.elseif \size == 4
st3 {v10.b, v11.b, v12.b}[0], [RGB], 3
st3 {v10.b, v11.b, v12.b}[1], [RGB], 3
st3 {v10.b, v11.b, v12.b}[2], [RGB], 3
st3 {v10.b, v11.b, v12.b}[3], [RGB], 3
.elseif \size == 2
st3 {v10.b, v11.b, v12.b}[4], [RGB], 3
st3 {v10.b, v11.b, v12.b}[5], [RGB], 3
.elseif \size == 1
st3 {v10.b, v11.b, v12.b}[6], [RGB], 3
.else
.error unsupported macroblock size
.endif
.elseif \bpp == 32
.if \size == 8
st4 {v10.8b, v11.8b, v12.8b, v13.8b}, [RGB], 32
.elseif \size == 4
st4 {v10.b, v11.b, v12.b, v13.b}[0], [RGB], 4
st4 {v10.b, v11.b, v12.b, v13.b}[1], [RGB], 4
st4 {v10.b, v11.b, v12.b, v13.b}[2], [RGB], 4
st4 {v10.b, v11.b, v12.b, v13.b}[3], [RGB], 4
.elseif \size == 2
st4 {v10.b, v11.b, v12.b, v13.b}[4], [RGB], 4
st4 {v10.b, v11.b, v12.b, v13.b}[5], [RGB], 4
.elseif \size == 1
st4 {v10.b, v11.b, v12.b, v13.b}[6], [RGB], 4
.else
.error unsupported macroblock size
.endif
.elseif \bpp==16
.if \size == 8
st1 {v25.8h}, [RGB], 16
.elseif \size == 4
st1 {v25.4h}, [RGB], 8
.elseif \size == 2
st1 {v25.h}[4], [RGB], 2
st1 {v25.h}[5], [RGB], 2
.elseif \size == 1
st1 {v25.h}[6], [RGB], 2
.else
.error unsupported macroblock size
.endif
.else
.error unsupported bpp
.endif
.endm
.macro generate_jsimd_ycc_rgb_convert_neon colorid, bpp, r_offs, rsize, g_offs, gsize, b_offs, bsize, defsize
/*
* 2-stage pipelined YCbCr->RGB conversion
*/
.macro do_yuv_to_rgb_stage1
uaddw v6.8h, v2.8h, v4.8b /* q3 = u - 128 */
uaddw v8.8h, v2.8h, v5.8b /* q2 = v - 128 */
smull v20.4s, v6.4h, v1.h[1] /* multiply by -11277 */
smlal v20.4s, v8.4h, v1.h[2] /* multiply by -23401 */
smull2 v22.4s, v6.8h, v1.h[1] /* multiply by -11277 */
smlal2 v22.4s, v8.8h, v1.h[2] /* multiply by -23401 */
smull v24.4s, v8.4h, v1.h[0] /* multiply by 22971 */
smull2 v26.4s, v8.8h, v1.h[0] /* multiply by 22971 */
smull v28.4s, v6.4h, v1.h[3] /* multiply by 29033 */
smull2 v30.4s, v6.8h, v1.h[3] /* multiply by 29033 */
.endm
.macro do_yuv_to_rgb_stage2
rshrn v20.4h, v20.4s, #15
rshrn2 v20.8h, v22.4s, #15
rshrn v24.4h, v24.4s, #14
rshrn2 v24.8h, v26.4s, #14
rshrn v28.4h, v28.4s, #14
rshrn2 v28.8h, v30.4s, #14
uaddw v20.8h, v20.8h, v0.8b
uaddw v24.8h, v24.8h, v0.8b
uaddw v28.8h, v28.8h, v0.8b
.if \bpp != 16
sqxtun v1\g_offs\defsize, v20.8h
sqxtun v1\r_offs\defsize, v24.8h
sqxtun v1\b_offs\defsize, v28.8h
.else
sqshlu v21.8h, v20.8h, #8
sqshlu v25.8h, v24.8h, #8
sqshlu v29.8h, v28.8h, #8
sri v25.8h, v21.8h, #5
sri v25.8h, v29.8h, #11
.endif
.endm
.macro do_yuv_to_rgb_stage2_store_load_stage1
rshrn v20.4h, v20.4s, #15
rshrn v24.4h, v24.4s, #14
rshrn v28.4h, v28.4s, #14
ld1 {v4.8b}, [U], 8
rshrn2 v20.8h, v22.4s, #15
rshrn2 v24.8h, v26.4s, #14
rshrn2 v28.8h, v30.4s, #14
ld1 {v5.8b}, [V], 8
uaddw v20.8h, v20.8h, v0.8b
uaddw v24.8h, v24.8h, v0.8b
uaddw v28.8h, v28.8h, v0.8b
.if \bpp != 16 /**************** rgb24/rgb32 ******************************/
sqxtun v1\g_offs\defsize, v20.8h
ld1 {v0.8b}, [Y], 8
sqxtun v1\r_offs\defsize, v24.8h
prfm pldl1keep, [U, #64]
prfm pldl1keep, [V, #64]
prfm pldl1keep, [Y, #64]
sqxtun v1\b_offs\defsize, v28.8h
uaddw v6.8h, v2.8h, v4.8b /* v6.16b = u - 128 */
uaddw v8.8h, v2.8h, v5.8b /* q2 = v - 128 */
smull v20.4s, v6.4h, v1.h[1] /* multiply by -11277 */
smlal v20.4s, v8.4h, v1.h[2] /* multiply by -23401 */
smull2 v22.4s, v6.8h, v1.h[1] /* multiply by -11277 */
smlal2 v22.4s, v8.8h, v1.h[2] /* multiply by -23401 */
smull v24.4s, v8.4h, v1.h[0] /* multiply by 22971 */
smull2 v26.4s, v8.8h, v1.h[0] /* multiply by 22971 */
.else /**************************** rgb565 ********************************/
sqshlu v21.8h, v20.8h, #8
sqshlu v25.8h, v24.8h, #8
sqshlu v29.8h, v28.8h, #8
uaddw v6.8h, v2.8h, v4.8b /* v6.16b = u - 128 */
uaddw v8.8h, v2.8h, v5.8b /* q2 = v - 128 */
ld1 {v0.8b}, [Y], 8
smull v20.4s, v6.4h, v1.h[1] /* multiply by -11277 */
smlal v20.4s, v8.4h, v1.h[2] /* multiply by -23401 */
smull2 v22.4s, v6.8h, v1.h[1] /* multiply by -11277 */
smlal2 v22.4s, v8.8h, v1.h[2] /* multiply by -23401 */
sri v25.8h, v21.8h, #5
smull v24.4s, v8.4h, v1.h[0] /* multiply by 22971 */
smull2 v26.4s, v8.8h, v1.h[0] /* multiply by 22971 */
prfm pldl1keep, [U, #64]
prfm pldl1keep, [V, #64]
prfm pldl1keep, [Y, #64]
sri v25.8h, v29.8h, #11
.endif
do_store \bpp, 8
smull v28.4s, v6.4h, v1.h[3] /* multiply by 29033 */
smull2 v30.4s, v6.8h, v1.h[3] /* multiply by 29033 */
.endm
.macro do_yuv_to_rgb
do_yuv_to_rgb_stage1
do_yuv_to_rgb_stage2
.endm
/* Apple gas crashes on adrl, work around that by using adr.
* But this requires a copy of these constants for each function.
*/
.balign 16
Ljsimd_ycc_\colorid\()_neon_consts:
.short 0, 0, 0, 0
.short 22971, -11277, -23401, 29033
.short -128, -128, -128, -128
.short -128, -128, -128, -128
asm_function jsimd_ycc_\colorid\()_convert_neon
OUTPUT_WIDTH .req x0
INPUT_BUF .req x1
INPUT_ROW .req x2
OUTPUT_BUF .req x3
NUM_ROWS .req x4
INPUT_BUF0 .req x5
INPUT_BUF1 .req x6
INPUT_BUF2 .req x1
RGB .req x7
Y .req x8
U .req x9
V .req x10
N .req x15
sub sp, sp, 336
str x15, [sp], 16
/* Load constants to d1, d2, d3 (v0.4h is just used for padding) */
adr x15, Ljsimd_ycc_\colorid\()_neon_consts
/* Save NEON registers */
st1 {v0.8b, v1.8b, v2.8b, v3.8b}, [sp], 32
st1 {v4.8b, v5.8b, v6.8b, v7.8b}, [sp], 32
st1 {v8.8b, v9.8b, v10.8b, v11.8b}, [sp], 32
st1 {v12.8b, v13.8b, v14.8b, v15.8b}, [sp], 32
st1 {v16.8b, v17.8b, v18.8b, v19.8b}, [sp], 32
st1 {v20.8b, v21.8b, v22.8b, v23.8b}, [sp], 32
st1 {v24.8b, v25.8b, v26.8b, v27.8b}, [sp], 32
st1 {v28.8b, v29.8b, v30.8b, v31.8b}, [sp], 32
ld1 {v0.4h, v1.4h}, [x15], 16
ld1 {v2.8h}, [x15]
/* Save ARM registers and handle input arguments */
/* push {x4, x5, x6, x7, x8, x9, x10, x30} */
stp x4, x5, [sp], 16
stp x6, x7, [sp], 16
stp x8, x9, [sp], 16
stp x10, x30, [sp], 16
ldr INPUT_BUF0, [INPUT_BUF]
ldr INPUT_BUF1, [INPUT_BUF, #8]
ldr INPUT_BUF2, [INPUT_BUF, #16]
.unreq INPUT_BUF
/* Initially set v10, v11.4h, v12.8b, d13 to 0xFF */
movi v10.16b, #255
movi v13.16b, #255
/* Outer loop over scanlines */
cmp NUM_ROWS, #1
b.lt 9f
0:
lsl x16, INPUT_ROW, #3
ldr Y, [INPUT_BUF0, x16]
ldr U, [INPUT_BUF1, x16]
mov N, OUTPUT_WIDTH
ldr V, [INPUT_BUF2, x16]
add INPUT_ROW, INPUT_ROW, #1
ldr RGB, [OUTPUT_BUF], #8
/* Inner loop over pixels */
subs N, N, #8
b.lt 3f
do_load 8
do_yuv_to_rgb_stage1
subs N, N, #8
b.lt 2f
1:
do_yuv_to_rgb_stage2_store_load_stage1
subs N, N, #8
b.ge 1b
2:
do_yuv_to_rgb_stage2
do_store \bpp, 8
tst N, #7
b.eq 8f
3:
tst N, #4
b.eq 3f
do_load 4
3:
tst N, #2
b.eq 4f
do_load 2
4:
tst N, #1
b.eq 5f
do_load 1
5:
do_yuv_to_rgb
tst N, #4
b.eq 6f
do_store \bpp, 4
6:
tst N, #2
b.eq 7f
do_store \bpp, 2
7:
tst N, #1
b.eq 8f
do_store \bpp, 1
8:
subs NUM_ROWS, NUM_ROWS, #1
b.gt 0b
9:
/* Restore all registers and return */
sub sp, sp, #336
ldr x15, [sp], 16
ld1 {v0.8b, v1.8b, v2.8b, v3.8b}, [sp], 32
ld1 {v4.8b, v5.8b, v6.8b, v7.8b}, [sp], 32
ld1 {v8.8b, v9.8b, v10.8b, v11.8b}, [sp], 32
ld1 {v12.8b, v13.8b, v14.8b, v15.8b}, [sp], 32
ld1 {v16.8b, v17.8b, v18.8b, v19.8b}, [sp], 32
ld1 {v20.8b, v21.8b, v22.8b, v23.8b}, [sp], 32
ld1 {v24.8b, v25.8b, v26.8b, v27.8b}, [sp], 32
ld1 {v28.8b, v29.8b, v30.8b, v31.8b}, [sp], 32
/* pop {r4, r5, r6, r7, r8, r9, r10, pc} */
ldp x4, x5, [sp], 16
ldp x6, x7, [sp], 16
ldp x8, x9, [sp], 16
ldp x10, x30, [sp], 16
br x30
.unreq OUTPUT_WIDTH
.unreq INPUT_ROW
.unreq OUTPUT_BUF
.unreq NUM_ROWS
.unreq INPUT_BUF0
.unreq INPUT_BUF1
.unreq INPUT_BUF2
.unreq RGB
.unreq Y
.unreq U
.unreq V
.unreq N
.purgem do_yuv_to_rgb
.purgem do_yuv_to_rgb_stage1
.purgem do_yuv_to_rgb_stage2
.purgem do_yuv_to_rgb_stage2_store_load_stage1
.endm
/*--------------------------------- id ----- bpp R rsize G gsize B bsize defsize */
generate_jsimd_ycc_rgb_convert_neon extrgb, 24, 0, .4h, 1, .4h, 2, .4h, .8b
generate_jsimd_ycc_rgb_convert_neon extbgr, 24, 2, .4h, 1, .4h, 0, .4h, .8b
generate_jsimd_ycc_rgb_convert_neon extrgbx, 32, 0, .4h, 1, .4h, 2, .4h, .8b
generate_jsimd_ycc_rgb_convert_neon extbgrx, 32, 2, .4h, 1, .4h, 0, .4h, .8b
generate_jsimd_ycc_rgb_convert_neon extxbgr, 32, 3, .4h, 2, .4h, 1, .4h, .8b
generate_jsimd_ycc_rgb_convert_neon extxrgb, 32, 1, .4h, 2, .4h, 3, .4h, .8b
generate_jsimd_ycc_rgb_convert_neon rgb565, 16, 0, .4h, 0, .4h, 0, .4h, .8b
.purgem do_load
.purgem do_store
/*****************************************************************************/
/*
* jsimd_extrgb_ycc_convert_neon
* jsimd_extbgr_ycc_convert_neon
* jsimd_extrgbx_ycc_convert_neon
* jsimd_extbgrx_ycc_convert_neon
* jsimd_extxbgr_ycc_convert_neon
* jsimd_extxrgb_ycc_convert_neon
*
* Colorspace conversion RGB -> YCbCr
*/
.macro do_store size
.if \size == 8
st1 {v20.8b}, [Y], #8
st1 {v21.8b}, [U], #8
st1 {v22.8b}, [V], #8
.elseif \size == 4
st1 {v20.b}[0], [Y], #1
st1 {v20.b}[1], [Y], #1
st1 {v20.b}[2], [Y], #1
st1 {v20.b}[3], [Y], #1
st1 {v21.b}[0], [U], #1
st1 {v21.b}[1], [U], #1
st1 {v21.b}[2], [U], #1
st1 {v21.b}[3], [U], #1
st1 {v22.b}[0], [V], #1
st1 {v22.b}[1], [V], #1
st1 {v22.b}[2], [V], #1
st1 {v22.b}[3], [V], #1
.elseif \size == 2
st1 {v20.b}[4], [Y], #1
st1 {v20.b}[5], [Y], #1
st1 {v21.b}[4], [U], #1
st1 {v21.b}[5], [U], #1
st1 {v22.b}[4], [V], #1
st1 {v22.b}[5], [V], #1
.elseif \size == 1
st1 {v20.b}[6], [Y], #1
st1 {v21.b}[6], [U], #1
st1 {v22.b}[6], [V], #1
.else
.error unsupported macroblock size
.endif
.endm
#if defined(__APPLE__) || defined(__ANDROID__)
/* TODO: expand this to include other devices that are known not to have a slow
* ld3 implementation. */
#define LD3_IS_FAST
#endif
.macro do_load bpp, size
.if \bpp == 24
.if \size == 8
#ifdef LD3_IS_FAST
ld3 {v10.8b, v11.8b, v12.8b}, [RGB], #24
#else
ld1 {v10.b}[0], [RGB], #1
ld1 {v11.b}[0], [RGB], #1
ld1 {v12.b}[0], [RGB], #1
ld1 {v10.b}[1], [RGB], #1
ld1 {v11.b}[1], [RGB], #1
ld1 {v12.b}[1], [RGB], #1
ld1 {v10.b}[2], [RGB], #1
ld1 {v11.b}[2], [RGB], #1
ld1 {v12.b}[2], [RGB], #1
ld1 {v10.b}[3], [RGB], #1
ld1 {v11.b}[3], [RGB], #1
ld1 {v12.b}[3], [RGB], #1
ld1 {v10.b}[4], [RGB], #1
ld1 {v11.b}[4], [RGB], #1
ld1 {v12.b}[4], [RGB], #1
ld1 {v10.b}[5], [RGB], #1
ld1 {v11.b}[5], [RGB], #1
ld1 {v12.b}[5], [RGB], #1
ld1 {v10.b}[6], [RGB], #1
ld1 {v11.b}[6], [RGB], #1
ld1 {v12.b}[6], [RGB], #1
ld1 {v10.b}[7], [RGB], #1
ld1 {v11.b}[7], [RGB], #1
ld1 {v12.b}[7], [RGB], #1
#endif
prfm pldl1keep, [RGB, #128]
.elseif \size == 4
ld3 {v10.b, v11.b, v12.b}[0], [RGB], #3
ld3 {v10.b, v11.b, v12.b}[1], [RGB], #3
ld3 {v10.b, v11.b, v12.b}[2], [RGB], #3
ld3 {v10.b, v11.b, v12.b}[3], [RGB], #3
.elseif \size == 2
ld3 {v10.b, v11.b, v12.b}[4], [RGB], #3
ld3 {v10.b, v11.b, v12.b}[5], [RGB], #3
.elseif \size == 1
ld3 {v10.b, v11.b, v12.b}[6], [RGB], #3
.else
.error unsupported macroblock size
.endif
.elseif \bpp == 32
.if \size == 8
ld4 {v10.8b, v11.8b, v12.8b, v13.8b}, [RGB], #32
prfm pldl1keep, [RGB, #128]
.elseif \size == 4
ld4 {v10.b, v11.b, v12.b, v13.b}[0], [RGB], #4
ld4 {v10.b, v11.b, v12.b, v13.b}[1], [RGB], #4
ld4 {v10.b, v11.b, v12.b, v13.b}[2], [RGB], #4
ld4 {v10.b, v11.b, v12.b, v13.b}[3], [RGB], #4
.elseif \size == 2
ld4 {v10.b, v11.b, v12.b, v13.b}[4], [RGB], #4
ld4 {v10.b, v11.b, v12.b, v13.b}[5], [RGB], #4
.elseif \size == 1
ld4 {v10.b, v11.b, v12.b, v13.b}[6], [RGB], #4
.else
.error unsupported macroblock size
.endif
.else
.error unsupported bpp
.endif
.endm
.macro generate_jsimd_rgb_ycc_convert_neon colorid, bpp, r_offs, g_offs, b_offs
/*
* 2-stage pipelined RGB->YCbCr conversion
*/
.macro do_rgb_to_yuv_stage1
ushll v4.8h, v1\r_offs\().8b, #0 /* r = v4 */
ushll v6.8h, v1\g_offs\().8b, #0 /* g = v6 */
ushll v8.8h, v1\b_offs\().8b, #0 /* b = v8 */
rev64 v18.4s, v1.4s
rev64 v26.4s, v1.4s
rev64 v28.4s, v1.4s
rev64 v30.4s, v1.4s
umull v14.4s, v4.4h, v0.h[0]
umull2 v16.4s, v4.8h, v0.h[0]
umlsl v18.4s, v4.4h, v0.h[3]
umlsl2 v26.4s, v4.8h, v0.h[3]
umlal v28.4s, v4.4h, v0.h[5]
umlal2 v30.4s, v4.8h, v0.h[5]
umlal v14.4s, v6.4h, v0.h[1]
umlal2 v16.4s, v6.8h, v0.h[1]
umlsl v18.4s, v6.4h, v0.h[4]
umlsl2 v26.4s, v6.8h, v0.h[4]
umlsl v28.4s, v6.4h, v0.h[6]
umlsl2 v30.4s, v6.8h, v0.h[6]
umlal v14.4s, v8.4h, v0.h[2]
umlal2 v16.4s, v8.8h, v0.h[2]
umlal v18.4s, v8.4h, v0.h[5]
umlal2 v26.4s, v8.8h, v0.h[5]
umlsl v28.4s, v8.4h, v0.h[7]
umlsl2 v30.4s, v8.8h, v0.h[7]
.endm
.macro do_rgb_to_yuv_stage2
rshrn v20.4h, v14.4s, #16
shrn v22.4h, v18.4s, #16
shrn v24.4h, v28.4s, #16
rshrn2 v20.8h, v16.4s, #16
shrn2 v22.8h, v26.4s, #16
shrn2 v24.8h, v30.4s, #16
xtn v20.8b, v20.8h /* v20 = y */
xtn v21.8b, v22.8h /* v21 = u */
xtn v22.8b, v24.8h /* v22 = v */
.endm
.macro do_rgb_to_yuv
do_rgb_to_yuv_stage1
do_rgb_to_yuv_stage2
.endm
/* TODO: expand macros and interleave instructions if some in-order
* ARM64 processor actually can dual-issue LOAD/STORE with ALU */
.macro do_rgb_to_yuv_stage2_store_load_stage1
do_rgb_to_yuv_stage2
do_load \bpp, 8
st1 {v20.8b}, [Y], #8
st1 {v21.8b}, [U], #8
st1 {v22.8b}, [V], #8
do_rgb_to_yuv_stage1
.endm
.balign 16
Ljsimd_\colorid\()_ycc_neon_consts:
.short 19595, 38470, 7471, 11059
.short 21709, 32768, 27439, 5329
.short 32767, 128, 32767, 128
.short 32767, 128, 32767, 128
asm_function jsimd_\colorid\()_ycc_convert_neon
OUTPUT_WIDTH .req w0
INPUT_BUF .req x1
OUTPUT_BUF .req x2
OUTPUT_ROW .req x3
NUM_ROWS .req x4
OUTPUT_BUF0 .req x5
OUTPUT_BUF1 .req x6
OUTPUT_BUF2 .req x2 /* OUTPUT_BUF */
RGB .req x7
Y .req x9
U .req x10
V .req x11
N .req w12
/* Load constants to d0, d1, d2, d3 */
adr x13, Ljsimd_\colorid\()_ycc_neon_consts
ld1 {v0.8h, v1.8h}, [x13]
ldr OUTPUT_BUF0, [OUTPUT_BUF]
ldr OUTPUT_BUF1, [OUTPUT_BUF, #8]
ldr OUTPUT_BUF2, [OUTPUT_BUF, #16]
.unreq OUTPUT_BUF
/* Save NEON registers */
sub sp, sp, #64
st1 {v8.8b, v9.8b, v10.8b, v11.8b}, [sp], 32
st1 {v12.8b, v13.8b, v14.8b, v15.8b}, [sp], 32
/* Outer loop over scanlines */
cmp NUM_ROWS, #1
b.lt 9f
0:
ldr Y, [OUTPUT_BUF0, OUTPUT_ROW, lsl #3]
ldr U, [OUTPUT_BUF1, OUTPUT_ROW, lsl #3]
mov N, OUTPUT_WIDTH
ldr V, [OUTPUT_BUF2, OUTPUT_ROW, lsl #3]
add OUTPUT_ROW, OUTPUT_ROW, #1
ldr RGB, [INPUT_BUF], #8
/* Inner loop over pixels */
subs N, N, #8
b.lt 3f
do_load \bpp, 8
do_rgb_to_yuv_stage1
subs N, N, #8
b.lt 2f
1:
do_rgb_to_yuv_stage2_store_load_stage1
subs N, N, #8
b.ge 1b
2:
do_rgb_to_yuv_stage2
do_store 8
tst N, #7
b.eq 8f
3:
tbz N, #2, 3f
do_load \bpp, 4
3:
tbz N, #1, 4f
do_load \bpp, 2
4:
tbz N, #0, 5f
do_load \bpp, 1
5:
do_rgb_to_yuv
tbz N, #2, 6f
do_store 4
6:
tbz N, #1, 7f
do_store 2
7:
tbz N, #0, 8f
do_store 1
8:
subs NUM_ROWS, NUM_ROWS, #1
b.gt 0b
9:
/* Restore all registers and return */
sub sp, sp, #64
ld1 {v8.8b, v9.8b, v10.8b, v11.8b}, [sp], 32
ld1 {v12.8b, v13.8b, v14.8b, v15.8b}, [sp], 32
br x30
.unreq OUTPUT_WIDTH
.unreq OUTPUT_ROW
.unreq INPUT_BUF
.unreq NUM_ROWS
.unreq OUTPUT_BUF0
.unreq OUTPUT_BUF1
.unreq OUTPUT_BUF2
.unreq RGB
.unreq Y
.unreq U
.unreq V
.unreq N
.purgem do_rgb_to_yuv
.purgem do_rgb_to_yuv_stage1
.purgem do_rgb_to_yuv_stage2
.purgem do_rgb_to_yuv_stage2_store_load_stage1
.endm
/*--------------------------------- id ----- bpp R G B */
generate_jsimd_rgb_ycc_convert_neon extrgb, 24, 0, 1, 2
generate_jsimd_rgb_ycc_convert_neon extbgr, 24, 2, 1, 0
generate_jsimd_rgb_ycc_convert_neon extrgbx, 32, 0, 1, 2
generate_jsimd_rgb_ycc_convert_neon extbgrx, 32, 2, 1, 0
generate_jsimd_rgb_ycc_convert_neon extxbgr, 32, 3, 2, 1
generate_jsimd_rgb_ycc_convert_neon extxrgb, 32, 1, 2, 3
.purgem do_load
.purgem do_store
/*****************************************************************************/
/*
* Load data into workspace, applying unsigned->signed conversion
*
* TODO: can be combined with 'jsimd_fdct_ifast_neon' to get
* rid of VST1.16 instructions
*/
asm_function jsimd_convsamp_neon
SAMPLE_DATA .req x0
START_COL .req x1
WORKSPACE .req x2
TMP1 .req x9
TMP2 .req x10
TMP3 .req x11
TMP4 .req x12
TMP5 .req x13
TMP6 .req x14
TMP7 .req x15
TMP8 .req x4
TMPDUP .req w3
mov TMPDUP, #128
ldp TMP1, TMP2, [SAMPLE_DATA], 16
ldp TMP3, TMP4, [SAMPLE_DATA], 16
dup v0.8b, TMPDUP
add TMP1, TMP1, START_COL
add TMP2, TMP2, START_COL
ldp TMP5, TMP6, [SAMPLE_DATA], 16
add TMP3, TMP3, START_COL
add TMP4, TMP4, START_COL
ldp TMP7, TMP8, [SAMPLE_DATA], 16
add TMP5, TMP5, START_COL
add TMP6, TMP6, START_COL
ld1 {v16.8b}, [TMP1]
add TMP7, TMP7, START_COL
add TMP8, TMP8, START_COL
ld1 {v17.8b}, [TMP2]
usubl v16.8h, v16.8b, v0.8b
ld1 {v18.8b}, [TMP3]
usubl v17.8h, v17.8b, v0.8b
ld1 {v19.8b}, [TMP4]
usubl v18.8h, v18.8b, v0.8b
ld1 {v20.8b}, [TMP5]
usubl v19.8h, v19.8b, v0.8b
ld1 {v21.8b}, [TMP6]
st1 {v16.8h, v17.8h, v18.8h, v19.8h}, [WORKSPACE], 64
usubl v20.8h, v20.8b, v0.8b
ld1 {v22.8b}, [TMP7]
usubl v21.8h, v21.8b, v0.8b
ld1 {v23.8b}, [TMP8]
usubl v22.8h, v22.8b, v0.8b
usubl v23.8h, v23.8b, v0.8b
st1 {v20.8h, v21.8h, v22.8h, v23.8h}, [WORKSPACE], 64
br x30
.unreq SAMPLE_DATA
.unreq START_COL
.unreq WORKSPACE
.unreq TMP1
.unreq TMP2
.unreq TMP3
.unreq TMP4
.unreq TMP5
.unreq TMP6
.unreq TMP7
.unreq TMP8
.unreq TMPDUP
/*****************************************************************************/
/*
* jsimd_fdct_islow_neon
*
* This file contains a slow-but-accurate integer implementation of the
* forward DCT (Discrete Cosine Transform). The following code is based
* directly on the IJG''s original jfdctint.c; see the jfdctint.c for
* more details.
*
* TODO: can be combined with 'jsimd_convsamp_neon' to get
* rid of a bunch of VLD1.16 instructions
*/
#define CONST_BITS 13
#define PASS1_BITS 2
#define DESCALE_P1 (CONST_BITS-PASS1_BITS)
#define DESCALE_P2 (CONST_BITS+PASS1_BITS)
#define F_0_298 2446 /* FIX(0.298631336) */
#define F_0_390 3196 /* FIX(0.390180644) */
#define F_0_541 4433 /* FIX(0.541196100) */
#define F_0_765 6270 /* FIX(0.765366865) */
#define F_0_899 7373 /* FIX(0.899976223) */
#define F_1_175 9633 /* FIX(1.175875602) */
#define F_1_501 12299 /* FIX(1.501321110) */
#define F_1_847 15137 /* FIX(1.847759065) */
#define F_1_961 16069 /* FIX(1.961570560) */
#define F_2_053 16819 /* FIX(2.053119869) */
#define F_2_562 20995 /* FIX(2.562915447) */
#define F_3_072 25172 /* FIX(3.072711026) */
.balign 16
Ljsimd_fdct_islow_neon_consts:
.short F_0_298
.short -F_0_390
.short F_0_541
.short F_0_765
.short - F_0_899
.short F_1_175
.short F_1_501
.short - F_1_847
.short - F_1_961
.short F_2_053
.short - F_2_562
.short F_3_072
.short 0 /* padding */
.short 0
.short 0
.short 0
#undef F_0_298
#undef F_0_390
#undef F_0_541
#undef F_0_765
#undef F_0_899
#undef F_1_175
#undef F_1_501
#undef F_1_847
#undef F_1_961
#undef F_2_053
#undef F_2_562
#undef F_3_072
#define XFIX_P_0_298 v0.h[0]
#define XFIX_N_0_390 v0.h[1]
#define XFIX_P_0_541 v0.h[2]
#define XFIX_P_0_765 v0.h[3]
#define XFIX_N_0_899 v0.h[4]
#define XFIX_P_1_175 v0.h[5]
#define XFIX_P_1_501 v0.h[6]
#define XFIX_N_1_847 v0.h[7]
#define XFIX_N_1_961 v1.h[0]
#define XFIX_P_2_053 v1.h[1]
#define XFIX_N_2_562 v1.h[2]
#define XFIX_P_3_072 v1.h[3]
asm_function jsimd_fdct_islow_neon
DATA .req x0
TMP .req x9
/* Load constants */
adr TMP, Ljsimd_fdct_islow_neon_consts
ld1 {v0.8h, v1.8h}, [TMP]
/* Save NEON registers */
sub sp, sp, #64
st1 {v8.8b, v9.8b, v10.8b, v11.8b}, [sp], 32
st1 {v12.8b, v13.8b, v14.8b, v15.8b}, [sp], 32
/* Load all DATA into NEON registers with the following allocation:
* 0 1 2 3 | 4 5 6 7
* ---------+--------
* 0 | d16 | d17 | v16.8h
* 1 | d18 | d19 | v17.8h
* 2 | d20 | d21 | v18.8h
* 3 | d22 | d23 | v19.8h
* 4 | d24 | d25 | v20.8h
* 5 | d26 | d27 | v21.8h
* 6 | d28 | d29 | v22.8h
* 7 | d30 | d31 | v23.8h
*/
ld1 {v16.8h, v17.8h, v18.8h, v19.8h}, [DATA], 64
ld1 {v20.8h, v21.8h, v22.8h, v23.8h}, [DATA]
sub DATA, DATA, #64
/* Transpose */
transpose_8x8 v16, v17, v18, v19, v20, v21, v22, v23, v31, v2, v3, v4
/* 1-D FDCT */
add v24.8h, v16.8h, v23.8h /* tmp0 = dataptr[0] + dataptr[7]; */
sub v31.8h, v16.8h, v23.8h /* tmp7 = dataptr[0] - dataptr[7]; */
add v25.8h, v17.8h, v22.8h /* tmp1 = dataptr[1] + dataptr[6]; */
sub v30.8h, v17.8h, v22.8h /* tmp6 = dataptr[1] - dataptr[6]; */
add v26.8h, v18.8h, v21.8h /* tmp2 = dataptr[2] + dataptr[5]; */
sub v29.8h, v18.8h, v21.8h /* tmp5 = dataptr[2] - dataptr[5]; */
add v27.8h, v19.8h, v20.8h /* tmp3 = dataptr[3] + dataptr[4]; */
sub v28.8h, v19.8h, v20.8h /* tmp4 = dataptr[3] - dataptr[4]; */
/* even part */
add v8.8h, v24.8h, v27.8h /* tmp10 = tmp0 + tmp3; */
sub v9.8h, v24.8h, v27.8h /* tmp13 = tmp0 - tmp3; */
add v10.8h, v25.8h, v26.8h /* tmp11 = tmp1 + tmp2; */
sub v11.8h, v25.8h, v26.8h /* tmp12 = tmp1 - tmp2; */
add v16.8h, v8.8h, v10.8h /* tmp10 + tmp11 */
sub v20.8h, v8.8h, v10.8h /* tmp10 - tmp11 */
add v18.8h, v11.8h, v9.8h /* tmp12 + tmp13 */
shl v16.8h, v16.8h, #PASS1_BITS /* dataptr[0] = (DCTELEM) LEFT_SHIFT(tmp10 + tmp11, PASS1_BITS); */
shl v20.8h, v20.8h, #PASS1_BITS /* dataptr[4] = (DCTELEM) LEFT_SHIFT(tmp10 - tmp11, PASS1_BITS); */
smull2 v24.4s, v18.8h, XFIX_P_0_541 /* z1 hi = MULTIPLY(tmp12 + tmp13, XFIX_P_0_541); */
smull v18.4s, v18.4h, XFIX_P_0_541 /* z1 lo = MULTIPLY(tmp12 + tmp13, XFIX_P_0_541); */
mov v22.16b, v18.16b
mov v25.16b, v24.16b
smlal v18.4s, v9.4h, XFIX_P_0_765 /* lo z1 + MULTIPLY(tmp13, XFIX_P_0_765) */
smlal2 v24.4s, v9.8h, XFIX_P_0_765 /* hi z1 + MULTIPLY(tmp13, XFIX_P_0_765) */
smlal v22.4s, v11.4h, XFIX_N_1_847 /* lo z1 + MULTIPLY(tmp12, XFIX_N_1_847) */
smlal2 v25.4s, v11.8h, XFIX_N_1_847 /* hi z1 + MULTIPLY(tmp12, XFIX_N_1_847) */
rshrn v18.4h, v18.4s, #DESCALE_P1
rshrn v22.4h, v22.4s, #DESCALE_P1
rshrn2 v18.8h, v24.4s, #DESCALE_P1 /* dataptr[2] = (DCTELEM) DESCALE(z1 + MULTIPLY(tmp13, XFIX_P_0_765), CONST_BITS-PASS1_BITS); */
rshrn2 v22.8h, v25.4s, #DESCALE_P1 /* dataptr[6] = (DCTELEM) DESCALE(z1 + MULTIPLY(tmp12, XFIX_N_1_847), CONST_BITS-PASS1_BITS); */
/* Odd part */
add v8.8h, v28.8h, v31.8h /* z1 = tmp4 + tmp7; */
add v9.8h, v29.8h, v30.8h /* z2 = tmp5 + tmp6; */
add v10.8h, v28.8h, v30.8h /* z3 = tmp4 + tmp6; */
add v11.8h, v29.8h, v31.8h /* z4 = tmp5 + tmp7; */
smull v4.4s, v10.4h, XFIX_P_1_175 /* z5 lo = z3 lo * XFIX_P_1_175 */
smull2 v5.4s, v10.8h, XFIX_P_1_175
smlal v4.4s, v11.4h, XFIX_P_1_175 /* z5 = MULTIPLY(z3 + z4, FIX_1_175875602); */
smlal2 v5.4s, v11.8h, XFIX_P_1_175
smull2 v24.4s, v28.8h, XFIX_P_0_298
smull2 v25.4s, v29.8h, XFIX_P_2_053
smull2 v26.4s, v30.8h, XFIX_P_3_072
smull2 v27.4s, v31.8h, XFIX_P_1_501
smull v28.4s, v28.4h, XFIX_P_0_298 /* tmp4 = MULTIPLY(tmp4, FIX_0_298631336); */
smull v29.4s, v29.4h, XFIX_P_2_053 /* tmp5 = MULTIPLY(tmp5, FIX_2_053119869); */
smull v30.4s, v30.4h, XFIX_P_3_072 /* tmp6 = MULTIPLY(tmp6, FIX_3_072711026); */
smull v31.4s, v31.4h, XFIX_P_1_501 /* tmp7 = MULTIPLY(tmp7, FIX_1_501321110); */
smull2 v12.4s, v8.8h, XFIX_N_0_899
smull2 v13.4s, v9.8h, XFIX_N_2_562
smull2 v14.4s, v10.8h, XFIX_N_1_961
smull2 v15.4s, v11.8h, XFIX_N_0_390
smull v8.4s, v8.4h, XFIX_N_0_899 /* z1 = MULTIPLY(z1, - FIX_0_899976223); */
smull v9.4s, v9.4h, XFIX_N_2_562 /* z2 = MULTIPLY(z2, - FIX_2_562915447); */
smull v10.4s, v10.4h, XFIX_N_1_961 /* z3 = MULTIPLY(z3, - FIX_1_961570560); */
smull v11.4s, v11.4h, XFIX_N_0_390 /* z4 = MULTIPLY(z4, - FIX_0_390180644); */
add v10.4s, v10.4s, v4.4s /* z3 += z5 */
add v14.4s, v14.4s, v5.4s
add v11.4s, v11.4s, v4.4s /* z4 += z5 */
add v15.4s, v15.4s, v5.4s
add v28.4s, v28.4s, v8.4s /* tmp4 += z1 */
add v24.4s, v24.4s, v12.4s
add v29.4s, v29.4s, v9.4s /* tmp5 += z2 */
add v25.4s, v25.4s, v13.4s
add v30.4s, v30.4s, v10.4s /* tmp6 += z3 */
add v26.4s, v26.4s, v14.4s
add v31.4s, v31.4s, v11.4s /* tmp7 += z4 */
add v27.4s, v27.4s, v15.4s
add v28.4s, v28.4s, v10.4s /* tmp4 += z3 */
add v24.4s, v24.4s, v14.4s
add v29.4s, v29.4s, v11.4s /* tmp5 += z4 */
add v25.4s, v25.4s, v15.4s
add v30.4s, v30.4s, v9.4s /* tmp6 += z2 */
add v26.4s, v26.4s, v13.4s
add v31.4s, v31.4s, v8.4s /* tmp7 += z1 */
add v27.4s, v27.4s, v12.4s
rshrn v23.4h, v28.4s, #DESCALE_P1
rshrn v21.4h, v29.4s, #DESCALE_P1
rshrn v19.4h, v30.4s, #DESCALE_P1
rshrn v17.4h, v31.4s, #DESCALE_P1
rshrn2 v23.8h, v24.4s, #DESCALE_P1 /* dataptr[7] = (DCTELEM) DESCALE(tmp4 + z1 + z3, CONST_BITS-PASS1_BITS); */
rshrn2 v21.8h, v25.4s, #DESCALE_P1 /* dataptr[5] = (DCTELEM) DESCALE(tmp5 + z2 + z4, CONST_BITS-PASS1_BITS); */
rshrn2 v19.8h, v26.4s, #DESCALE_P1 /* dataptr[3] = (DCTELEM) DESCALE(tmp6 + z2 + z3, CONST_BITS-PASS1_BITS); */
rshrn2 v17.8h, v27.4s, #DESCALE_P1 /* dataptr[1] = (DCTELEM) DESCALE(tmp7 + z1 + z4, CONST_BITS-PASS1_BITS); */
/* Transpose */
transpose_8x8 v16, v17, v18, v19, v20, v21, v22, v23, v31, v2, v3, v4
/* 1-D FDCT */
add v24.8h, v16.8h, v23.8h /* tmp0 = dataptr[0] + dataptr[7]; */
sub v31.8h, v16.8h, v23.8h /* tmp7 = dataptr[0] - dataptr[7]; */
add v25.8h, v17.8h, v22.8h /* tmp1 = dataptr[1] + dataptr[6]; */
sub v30.8h, v17.8h, v22.8h /* tmp6 = dataptr[1] - dataptr[6]; */
add v26.8h, v18.8h, v21.8h /* tmp2 = dataptr[2] + dataptr[5]; */
sub v29.8h, v18.8h, v21.8h /* tmp5 = dataptr[2] - dataptr[5]; */
add v27.8h, v19.8h, v20.8h /* tmp3 = dataptr[3] + dataptr[4]; */
sub v28.8h, v19.8h, v20.8h /* tmp4 = dataptr[3] - dataptr[4]; */
/* even part */
add v8.8h, v24.8h, v27.8h /* tmp10 = tmp0 + tmp3; */
sub v9.8h, v24.8h, v27.8h /* tmp13 = tmp0 - tmp3; */
add v10.8h, v25.8h, v26.8h /* tmp11 = tmp1 + tmp2; */
sub v11.8h, v25.8h, v26.8h /* tmp12 = tmp1 - tmp2; */
add v16.8h, v8.8h, v10.8h /* tmp10 + tmp11 */
sub v20.8h, v8.8h, v10.8h /* tmp10 - tmp11 */
add v18.8h, v11.8h, v9.8h /* tmp12 + tmp13 */
srshr v16.8h, v16.8h, #PASS1_BITS /* dataptr[0] = (DCTELEM) DESCALE(tmp10 + tmp11, PASS1_BITS); */
srshr v20.8h, v20.8h, #PASS1_BITS /* dataptr[4] = (DCTELEM) DESCALE(tmp10 - tmp11, PASS1_BITS); */
smull2 v24.4s, v18.8h, XFIX_P_0_541 /* z1 hi = MULTIPLY(tmp12 + tmp13, XFIX_P_0_541); */
smull v18.4s, v18.4h, XFIX_P_0_541 /* z1 lo = MULTIPLY(tmp12 + tmp13, XFIX_P_0_541); */
mov v22.16b, v18.16b
mov v25.16b, v24.16b
smlal v18.4s, v9.4h, XFIX_P_0_765 /* lo z1 + MULTIPLY(tmp13, XFIX_P_0_765) */
smlal2 v24.4s, v9.8h, XFIX_P_0_765 /* hi z1 + MULTIPLY(tmp13, XFIX_P_0_765) */
smlal v22.4s, v11.4h, XFIX_N_1_847 /* lo z1 + MULTIPLY(tmp12, XFIX_N_1_847) */
smlal2 v25.4s, v11.8h, XFIX_N_1_847 /* hi z1 + MULTIPLY(tmp12, XFIX_N_1_847) */
rshrn v18.4h, v18.4s, #DESCALE_P2
rshrn v22.4h, v22.4s, #DESCALE_P2
rshrn2 v18.8h, v24.4s, #DESCALE_P2 /* dataptr[2] = (DCTELEM) DESCALE(z1 + MULTIPLY(tmp13, XFIX_P_0_765), CONST_BITS-PASS1_BITS); */
rshrn2 v22.8h, v25.4s, #DESCALE_P2 /* dataptr[6] = (DCTELEM) DESCALE(z1 + MULTIPLY(tmp12, XFIX_N_1_847), CONST_BITS-PASS1_BITS); */
/* Odd part */
add v8.8h, v28.8h, v31.8h /* z1 = tmp4 + tmp7; */
add v9.8h, v29.8h, v30.8h /* z2 = tmp5 + tmp6; */
add v10.8h, v28.8h, v30.8h /* z3 = tmp4 + tmp6; */
add v11.8h, v29.8h, v31.8h /* z4 = tmp5 + tmp7; */
smull v4.4s, v10.4h, XFIX_P_1_175 /* z5 lo = z3 lo * XFIX_P_1_175 */
smull2 v5.4s, v10.8h, XFIX_P_1_175
smlal v4.4s, v11.4h, XFIX_P_1_175 /* z5 = MULTIPLY(z3 + z4, FIX_1_175875602); */
smlal2 v5.4s, v11.8h, XFIX_P_1_175
smull2 v24.4s, v28.8h, XFIX_P_0_298
smull2 v25.4s, v29.8h, XFIX_P_2_053
smull2 v26.4s, v30.8h, XFIX_P_3_072
smull2 v27.4s, v31.8h, XFIX_P_1_501
smull v28.4s, v28.4h, XFIX_P_0_298 /* tmp4 = MULTIPLY(tmp4, FIX_0_298631336); */
smull v29.4s, v29.4h, XFIX_P_2_053 /* tmp5 = MULTIPLY(tmp5, FIX_2_053119869); */
smull v30.4s, v30.4h, XFIX_P_3_072 /* tmp6 = MULTIPLY(tmp6, FIX_3_072711026); */
smull v31.4s, v31.4h, XFIX_P_1_501 /* tmp7 = MULTIPLY(tmp7, FIX_1_501321110); */
smull2 v12.4s, v8.8h, XFIX_N_0_899
smull2 v13.4s, v9.8h, XFIX_N_2_562
smull2 v14.4s, v10.8h, XFIX_N_1_961
smull2 v15.4s, v11.8h, XFIX_N_0_390
smull v8.4s, v8.4h, XFIX_N_0_899 /* z1 = MULTIPLY(z1, - FIX_0_899976223); */
smull v9.4s, v9.4h, XFIX_N_2_562 /* z2 = MULTIPLY(z2, - FIX_2_562915447); */
smull v10.4s, v10.4h, XFIX_N_1_961 /* z3 = MULTIPLY(z3, - FIX_1_961570560); */
smull v11.4s, v11.4h, XFIX_N_0_390 /* z4 = MULTIPLY(z4, - FIX_0_390180644); */
add v10.4s, v10.4s, v4.4s
add v14.4s, v14.4s, v5.4s
add v11.4s, v11.4s, v4.4s
add v15.4s, v15.4s, v5.4s
add v28.4s, v28.4s, v8.4s /* tmp4 += z1 */
add v24.4s, v24.4s, v12.4s
add v29.4s, v29.4s, v9.4s /* tmp5 += z2 */
add v25.4s, v25.4s, v13.4s
add v30.4s, v30.4s, v10.4s /* tmp6 += z3 */
add v26.4s, v26.4s, v14.4s
add v31.4s, v31.4s, v11.4s /* tmp7 += z4 */
add v27.4s, v27.4s, v15.4s
add v28.4s, v28.4s, v10.4s /* tmp4 += z3 */
add v24.4s, v24.4s, v14.4s
add v29.4s, v29.4s, v11.4s /* tmp5 += z4 */
add v25.4s, v25.4s, v15.4s
add v30.4s, v30.4s, v9.4s /* tmp6 += z2 */
add v26.4s, v26.4s, v13.4s
add v31.4s, v31.4s, v8.4s /* tmp7 += z1 */
add v27.4s, v27.4s, v12.4s
rshrn v23.4h, v28.4s, #DESCALE_P2
rshrn v21.4h, v29.4s, #DESCALE_P2
rshrn v19.4h, v30.4s, #DESCALE_P2
rshrn v17.4h, v31.4s, #DESCALE_P2
rshrn2 v23.8h, v24.4s, #DESCALE_P2 /* dataptr[7] = (DCTELEM) DESCALE(tmp4 + z1 + z3, CONST_BITS-PASS1_BITS); */
rshrn2 v21.8h, v25.4s, #DESCALE_P2 /* dataptr[5] = (DCTELEM) DESCALE(tmp5 + z2 + z4, CONST_BITS-PASS1_BITS); */
rshrn2 v19.8h, v26.4s, #DESCALE_P2 /* dataptr[3] = (DCTELEM) DESCALE(tmp6 + z2 + z3, CONST_BITS-PASS1_BITS); */
rshrn2 v17.8h, v27.4s, #DESCALE_P2 /* dataptr[1] = (DCTELEM) DESCALE(tmp7 + z1 + z4, CONST_BITS-PASS1_BITS); */
/* store results */
st1 {v16.8h, v17.8h, v18.8h, v19.8h}, [DATA], 64
st1 {v20.8h, v21.8h, v22.8h, v23.8h}, [DATA]
/* Restore NEON registers */
sub sp, sp, #64
ld1 {v8.8b, v9.8b, v10.8b, v11.8b}, [sp], 32
ld1 {v12.8b, v13.8b, v14.8b, v15.8b}, [sp], 32
br x30
.unreq DATA
.unreq TMP
#undef XFIX_P_0_298
#undef XFIX_N_0_390
#undef XFIX_P_0_541
#undef XFIX_P_0_765
#undef XFIX_N_0_899
#undef XFIX_P_1_175
#undef XFIX_P_1_501
#undef XFIX_N_1_847
#undef XFIX_N_1_961
#undef XFIX_P_2_053
#undef XFIX_N_2_562
#undef XFIX_P_3_072
/*****************************************************************************/
/*
* jsimd_fdct_ifast_neon
*
* This function contains a fast, not so accurate integer implementation of
* the forward DCT (Discrete Cosine Transform). It uses the same calculations
* and produces exactly the same output as IJG's original 'jpeg_fdct_ifast'
* function from jfdctfst.c
*
* TODO: can be combined with 'jsimd_convsamp_neon' to get
* rid of a bunch of VLD1.16 instructions
*/
#undef XFIX_0_541196100
#define XFIX_0_382683433 v0.h[0]
#define XFIX_0_541196100 v0.h[1]
#define XFIX_0_707106781 v0.h[2]
#define XFIX_1_306562965 v0.h[3]
.balign 16
Ljsimd_fdct_ifast_neon_consts:
.short (98 * 128) /* XFIX_0_382683433 */
.short (139 * 128) /* XFIX_0_541196100 */
.short (181 * 128) /* XFIX_0_707106781 */
.short (334 * 128 - 256 * 128) /* XFIX_1_306562965 */
asm_function jsimd_fdct_ifast_neon
DATA .req x0
TMP .req x9
/* Load constants */
adr TMP, Ljsimd_fdct_ifast_neon_consts
ld1 {v0.4h}, [TMP]
/* Load all DATA into NEON registers with the following allocation:
* 0 1 2 3 | 4 5 6 7
* ---------+--------
* 0 | d16 | d17 | v0.8h
* 1 | d18 | d19 | q9
* 2 | d20 | d21 | q10
* 3 | d22 | d23 | q11
* 4 | d24 | d25 | q12
* 5 | d26 | d27 | q13
* 6 | d28 | d29 | q14
* 7 | d30 | d31 | q15
*/
ld1 {v16.8h, v17.8h, v18.8h, v19.8h}, [DATA], 64
ld1 {v20.8h, v21.8h, v22.8h, v23.8h}, [DATA]
mov TMP, #2
sub DATA, DATA, #64
1:
/* Transpose */
transpose_8x8 v16, v17, v18, v19, v20, v21, v22, v23, v1, v2, v3, v4
subs TMP, TMP, #1
/* 1-D FDCT */
add v4.8h, v19.8h, v20.8h
sub v20.8h, v19.8h, v20.8h
sub v28.8h, v18.8h, v21.8h
add v18.8h, v18.8h, v21.8h
sub v29.8h, v17.8h, v22.8h
add v17.8h, v17.8h, v22.8h
sub v21.8h, v16.8h, v23.8h
add v16.8h, v16.8h, v23.8h
sub v6.8h, v17.8h, v18.8h
sub v7.8h, v16.8h, v4.8h
add v5.8h, v17.8h, v18.8h
add v6.8h, v6.8h, v7.8h
add v4.8h, v16.8h, v4.8h
sqdmulh v6.8h, v6.8h, XFIX_0_707106781
add v19.8h, v20.8h, v28.8h
add v16.8h, v4.8h, v5.8h
sub v20.8h, v4.8h, v5.8h
add v5.8h, v28.8h, v29.8h
add v29.8h, v29.8h, v21.8h
sqdmulh v5.8h, v5.8h, XFIX_0_707106781
sub v28.8h, v19.8h, v29.8h
add v18.8h, v7.8h, v6.8h
sqdmulh v28.8h, v28.8h, XFIX_0_382683433
sub v22.8h, v7.8h, v6.8h
sqdmulh v19.8h, v19.8h, XFIX_0_541196100
sqdmulh v7.8h, v29.8h, XFIX_1_306562965
add v6.8h, v21.8h, v5.8h
sub v5.8h, v21.8h, v5.8h
add v29.8h, v29.8h, v28.8h
add v19.8h, v19.8h, v28.8h
add v29.8h, v29.8h, v7.8h
add v21.8h, v5.8h, v19.8h
sub v19.8h, v5.8h, v19.8h
add v17.8h, v6.8h, v29.8h
sub v23.8h, v6.8h, v29.8h
b.ne 1b
/* store results */
st1 {v16.8h, v17.8h, v18.8h, v19.8h}, [DATA], 64
st1 {v20.8h, v21.8h, v22.8h, v23.8h}, [DATA]
br x30
.unreq DATA
.unreq TMP
#undef XFIX_0_382683433
#undef XFIX_0_541196100
#undef XFIX_0_707106781
#undef XFIX_1_306562965
/*****************************************************************************/
/*
* GLOBAL(void)
* jsimd_quantize_neon (JCOEFPTR coef_block, DCTELEM * divisors,
* DCTELEM * workspace);
*
*/
asm_function jsimd_quantize_neon
COEF_BLOCK .req x0
DIVISORS .req x1
WORKSPACE .req x2
RECIPROCAL .req DIVISORS
CORRECTION .req x9
SHIFT .req x10
LOOP_COUNT .req x11
mov LOOP_COUNT, #2
add CORRECTION, DIVISORS, #(64 * 2)
add SHIFT, DIVISORS, #(64 * 6)
1:
subs LOOP_COUNT, LOOP_COUNT, #1
ld1 {v0.8h, v1.8h, v2.8h, v3.8h}, [WORKSPACE], 64
ld1 {v4.8h, v5.8h, v6.8h, v7.8h}, [CORRECTION], 64
abs v20.8h, v0.8h
abs v21.8h, v1.8h
abs v22.8h, v2.8h
abs v23.8h, v3.8h
ld1 {v28.8h, v29.8h, v30.8h, v31.8h}, [RECIPROCAL], 64
add v20.8h, v20.8h, v4.8h /* add correction */
add v21.8h, v21.8h, v5.8h
add v22.8h, v22.8h, v6.8h
add v23.8h, v23.8h, v7.8h
umull v4.4s, v20.4h, v28.4h /* multiply by reciprocal */
umull2 v16.4s, v20.8h, v28.8h
umull v5.4s, v21.4h, v29.4h
umull2 v17.4s, v21.8h, v29.8h
umull v6.4s, v22.4h, v30.4h /* multiply by reciprocal */
umull2 v18.4s, v22.8h, v30.8h
umull v7.4s, v23.4h, v31.4h
umull2 v19.4s, v23.8h, v31.8h
ld1 {v24.8h, v25.8h, v26.8h, v27.8h}, [SHIFT], 64
shrn v4.4h, v4.4s, #16
shrn v5.4h, v5.4s, #16
shrn v6.4h, v6.4s, #16
shrn v7.4h, v7.4s, #16
shrn2 v4.8h, v16.4s, #16
shrn2 v5.8h, v17.4s, #16
shrn2 v6.8h, v18.4s, #16
shrn2 v7.8h, v19.4s, #16
neg v24.8h, v24.8h
neg v25.8h, v25.8h
neg v26.8h, v26.8h
neg v27.8h, v27.8h
sshr v0.8h, v0.8h, #15 /* extract sign */
sshr v1.8h, v1.8h, #15
sshr v2.8h, v2.8h, #15
sshr v3.8h, v3.8h, #15
ushl v4.8h, v4.8h, v24.8h /* shift */
ushl v5.8h, v5.8h, v25.8h
ushl v6.8h, v6.8h, v26.8h
ushl v7.8h, v7.8h, v27.8h
eor v4.16b, v4.16b, v0.16b /* restore sign */
eor v5.16b, v5.16b, v1.16b
eor v6.16b, v6.16b, v2.16b
eor v7.16b, v7.16b, v3.16b
sub v4.8h, v4.8h, v0.8h
sub v5.8h, v5.8h, v1.8h
sub v6.8h, v6.8h, v2.8h
sub v7.8h, v7.8h, v3.8h
st1 {v4.8h, v5.8h, v6.8h, v7.8h}, [COEF_BLOCK], 64
b.ne 1b
br x30 /* return */
.unreq COEF_BLOCK
.unreq DIVISORS
.unreq WORKSPACE
.unreq RECIPROCAL
.unreq CORRECTION
.unreq SHIFT
.unreq LOOP_COUNT
/*****************************************************************************/
/*
* Downsample pixel values of a single component.
* This version handles the common case of 2:1 horizontal and 1:1 vertical,
* without smoothing.
*
* GLOBAL(void)
* jsimd_h2v1_downsample_neon (JDIMENSION image_width, int max_v_samp_factor,
* JDIMENSION v_samp_factor,
* JDIMENSION width_blocks, JSAMPARRAY input_data,
* JSAMPARRAY output_data);
*/
.balign 16
Ljsimd_h2_downsample_neon_consts:
.byte 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, \
0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F /* diff 0 */
.byte 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, \
0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0E /* diff 1 */
.byte 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, \
0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0D, 0x0D /* diff 2 */
.byte 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, \
0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0C, 0x0C, 0x0C /* diff 3 */
.byte 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, \
0x08, 0x09, 0x0A, 0x0B, 0x0B, 0x0B, 0x0B, 0x0B /* diff 4 */
.byte 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, \
0x08, 0x09, 0x0A, 0x0A, 0x0A, 0x0A, 0x0A, 0x0A /* diff 5 */
.byte 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, \
0x08, 0x09, 0x09, 0x09, 0x09, 0x09, 0x09, 0x09 /* diff 6 */
.byte 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, \
0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08 /* diff 7 */
.byte 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, \
0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07 /* diff 8 */
.byte 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x06, \
0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06 /* diff 9 */
.byte 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x05, 0x05, \
0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05 /* diff 10 */
.byte 0x00, 0x01, 0x02, 0x03, 0x04, 0x04, 0x04, 0x04, \
0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04 /* diff 11 */
.byte 0x00, 0x01, 0x02, 0x03, 0x03, 0x03, 0x03, 0x03, \
0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03 /* diff 12 */
.byte 0x00, 0x01, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, \
0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02 /* diff 13 */
.byte 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, \
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01 /* diff 14 */
.byte 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 /* diff 15 */
asm_function jsimd_h2v1_downsample_neon
IMAGE_WIDTH .req x0
MAX_V_SAMP .req x1
V_SAMP .req x2
BLOCK_WIDTH .req x3
INPUT_DATA .req x4
OUTPUT_DATA .req x5
OUTPTR .req x9
INPTR .req x10
TMP1 .req x11
TMP2 .req x12
TMP3 .req x13
TMPDUP .req w15
mov TMPDUP, #0x10000
lsl TMP2, BLOCK_WIDTH, #4
sub TMP2, TMP2, IMAGE_WIDTH
adr TMP3, Ljsimd_h2_downsample_neon_consts
add TMP3, TMP3, TMP2, lsl #4
dup v16.4s, TMPDUP
ld1 {v18.16b}, [TMP3]
1: /* row loop */
ldr INPTR, [INPUT_DATA], #8
ldr OUTPTR, [OUTPUT_DATA], #8
subs TMP1, BLOCK_WIDTH, #1
b.eq 3f
2: /* columns */
ld1 {v0.16b}, [INPTR], #16
mov v4.16b, v16.16b
subs TMP1, TMP1, #1
uadalp v4.8h, v0.16b
shrn v6.8b, v4.8h, #1
st1 {v6.8b}, [OUTPTR], #8
b.ne 2b
3: /* last columns */
ld1 {v0.16b}, [INPTR]
mov v4.16b, v16.16b
subs V_SAMP, V_SAMP, #1
/* expand right */
tbl v2.16b, {v0.16b}, v18.16b
uadalp v4.8h, v2.16b
shrn v6.8b, v4.8h, #1
st1 {v6.8b}, [OUTPTR], #8
b.ne 1b
br x30
.unreq IMAGE_WIDTH
.unreq MAX_V_SAMP
.unreq V_SAMP
.unreq BLOCK_WIDTH
.unreq INPUT_DATA
.unreq OUTPUT_DATA
.unreq OUTPTR
.unreq INPTR
.unreq TMP1
.unreq TMP2
.unreq TMP3
.unreq TMPDUP
/*****************************************************************************/
/*
* Downsample pixel values of a single component.
* This version handles the common case of 2:1 horizontal and 2:1 vertical,
* without smoothing.
*
* GLOBAL(void)
* jsimd_h2v2_downsample_neon (JDIMENSION image_width, int max_v_samp_factor,
* JDIMENSION v_samp_factor, JDIMENSION width_blocks,
* JSAMPARRAY input_data, JSAMPARRAY output_data);
*/
.balign 16
asm_function jsimd_h2v2_downsample_neon
IMAGE_WIDTH .req x0
MAX_V_SAMP .req x1
V_SAMP .req x2
BLOCK_WIDTH .req x3
INPUT_DATA .req x4
OUTPUT_DATA .req x5
OUTPTR .req x9
INPTR0 .req x10
INPTR1 .req x14
TMP1 .req x11
TMP2 .req x12
TMP3 .req x13
TMPDUP .req w15
mov TMPDUP, #1
lsl TMP2, BLOCK_WIDTH, #4
lsl TMPDUP, TMPDUP, #17
sub TMP2, TMP2, IMAGE_WIDTH
adr TMP3, Ljsimd_h2_downsample_neon_consts
orr TMPDUP, TMPDUP, #1
add TMP3, TMP3, TMP2, lsl #4
dup v16.4s, TMPDUP
ld1 {v18.16b}, [TMP3]
1: /* row loop */
ldr INPTR0, [INPUT_DATA], #8
ldr OUTPTR, [OUTPUT_DATA], #8
ldr INPTR1, [INPUT_DATA], #8
subs TMP1, BLOCK_WIDTH, #1
b.eq 3f
2: /* columns */
ld1 {v0.16b}, [INPTR0], #16
ld1 {v1.16b}, [INPTR1], #16
mov v4.16b, v16.16b
subs TMP1, TMP1, #1
uadalp v4.8h, v0.16b
uadalp v4.8h, v1.16b
shrn v6.8b, v4.8h, #2
st1 {v6.8b}, [OUTPTR], #8
b.ne 2b
3: /* last columns */
ld1 {v0.16b}, [INPTR0], #16
ld1 {v1.16b}, [INPTR1], #16
mov v4.16b, v16.16b
subs V_SAMP, V_SAMP, #1
/* expand right */
tbl v2.16b, {v0.16b}, v18.16b
tbl v3.16b, {v1.16b}, v18.16b
uadalp v4.8h, v2.16b
uadalp v4.8h, v3.16b
shrn v6.8b, v4.8h, #2
st1 {v6.8b}, [OUTPTR], #8
b.ne 1b
br x30
.unreq IMAGE_WIDTH
.unreq MAX_V_SAMP
.unreq V_SAMP
.unreq BLOCK_WIDTH
.unreq INPUT_DATA
.unreq OUTPUT_DATA
.unreq OUTPTR
.unreq INPTR0
.unreq INPTR1
.unreq TMP1
.unreq TMP2
.unreq TMP3
.unreq TMPDUP