| ; |
| ; jidctfst.asm - fast integer IDCT (MMX) |
| ; |
| ; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB |
| ; |
| ; Based on the x86 SIMD extension for IJG JPEG library |
| ; Copyright (C) 1999-2006, MIYASAKA Masaru. |
| ; For conditions of distribution and use, see copyright notice in jsimdext.inc |
| ; |
| ; This file should be assembled with NASM (Netwide Assembler), |
| ; can *not* be assembled with Microsoft's MASM or any compatible |
| ; assembler (including Borland's Turbo Assembler). |
| ; NASM is available from http://nasm.sourceforge.net/ or |
| ; http://sourceforge.net/project/showfiles.php?group_id=6208 |
| ; |
| ; This file contains a fast, not so accurate integer implementation of |
| ; the inverse DCT (Discrete Cosine Transform). The following code is |
| ; based directly on the IJG's original jidctfst.c; see the jidctfst.c |
| ; for more details. |
| ; |
| ; [TAB8] |
| |
| %include "jsimdext.inc" |
| %include "jdct.inc" |
| |
| ; -------------------------------------------------------------------------- |
| |
| %define CONST_BITS 8 ; 14 is also OK. |
| %define PASS1_BITS 2 |
| |
| %if IFAST_SCALE_BITS != PASS1_BITS |
| %error "'IFAST_SCALE_BITS' must be equal to 'PASS1_BITS'." |
| %endif |
| |
| %if CONST_BITS == 8 |
| F_1_082 equ 277 ; FIX(1.082392200) |
| F_1_414 equ 362 ; FIX(1.414213562) |
| F_1_847 equ 473 ; FIX(1.847759065) |
| F_2_613 equ 669 ; FIX(2.613125930) |
| F_1_613 equ (F_2_613 - 256) ; FIX(2.613125930) - FIX(1) |
| %else |
| ; NASM cannot do compile-time arithmetic on floating-point constants. |
| %define DESCALE(x,n) (((x)+(1<<((n)-1)))>>(n)) |
| F_1_082 equ DESCALE(1162209775,30-CONST_BITS) ; FIX(1.082392200) |
| F_1_414 equ DESCALE(1518500249,30-CONST_BITS) ; FIX(1.414213562) |
| F_1_847 equ DESCALE(1984016188,30-CONST_BITS) ; FIX(1.847759065) |
| F_2_613 equ DESCALE(2805822602,30-CONST_BITS) ; FIX(2.613125930) |
| F_1_613 equ (F_2_613 - (1 << CONST_BITS)) ; FIX(2.613125930) - FIX(1) |
| %endif |
| |
| ; -------------------------------------------------------------------------- |
| SECTION SEG_CONST |
| |
| ; PRE_MULTIPLY_SCALE_BITS <= 2 (to avoid overflow) |
| ; CONST_BITS + CONST_SHIFT + PRE_MULTIPLY_SCALE_BITS == 16 (for pmulhw) |
| |
| %define PRE_MULTIPLY_SCALE_BITS 2 |
| %define CONST_SHIFT (16 - PRE_MULTIPLY_SCALE_BITS - CONST_BITS) |
| |
| alignz 16 |
| global EXTN(jconst_idct_ifast_mmx) |
| |
| EXTN(jconst_idct_ifast_mmx): |
| |
| PW_F1414 times 4 dw F_1_414 << CONST_SHIFT |
| PW_F1847 times 4 dw F_1_847 << CONST_SHIFT |
| PW_MF1613 times 4 dw -F_1_613 << CONST_SHIFT |
| PW_F1082 times 4 dw F_1_082 << CONST_SHIFT |
| PB_CENTERJSAMP times 8 db CENTERJSAMPLE |
| |
| alignz 16 |
| |
| ; -------------------------------------------------------------------------- |
| SECTION SEG_TEXT |
| BITS 32 |
| ; |
| ; Perform dequantization and inverse DCT on one block of coefficients. |
| ; |
| ; GLOBAL(void) |
| ; jsimd_idct_ifast_mmx (void *dct_table, JCOEFPTR coef_block, |
| ; JSAMPARRAY output_buf, JDIMENSION output_col) |
| ; |
| |
| %define dct_table(b) (b)+8 ; jpeg_component_info *compptr |
| %define coef_block(b) (b)+12 ; JCOEFPTR coef_block |
| %define output_buf(b) (b)+16 ; JSAMPARRAY output_buf |
| %define output_col(b) (b)+20 ; JDIMENSION output_col |
| |
| %define original_ebp ebp+0 |
| %define wk(i) ebp-(WK_NUM-(i))*SIZEOF_MMWORD ; mmword wk[WK_NUM] |
| %define WK_NUM 2 |
| %define workspace wk(0)-DCTSIZE2*SIZEOF_JCOEF |
| ; JCOEF workspace[DCTSIZE2] |
| |
| align 16 |
| global EXTN(jsimd_idct_ifast_mmx) |
| |
| EXTN(jsimd_idct_ifast_mmx): |
| push ebp |
| mov eax,esp ; eax = original ebp |
| sub esp, byte 4 |
| and esp, byte (-SIZEOF_MMWORD) ; align to 64 bits |
| mov [esp],eax |
| mov ebp,esp ; ebp = aligned ebp |
| lea esp, [workspace] |
| push ebx |
| ; push ecx ; need not be preserved |
| ; push edx ; need not be preserved |
| push esi |
| push edi |
| |
| get_GOT ebx ; get GOT address |
| |
| ; ---- Pass 1: process columns from input, store into work array. |
| |
| ; mov eax, [original_ebp] |
| mov edx, POINTER [dct_table(eax)] ; quantptr |
| mov esi, JCOEFPTR [coef_block(eax)] ; inptr |
| lea edi, [workspace] ; JCOEF *wsptr |
| mov ecx, DCTSIZE/4 ; ctr |
| alignx 16,7 |
| .columnloop: |
| %ifndef NO_ZERO_COLUMN_TEST_IFAST_MMX |
| mov eax, DWORD [DWBLOCK(1,0,esi,SIZEOF_JCOEF)] |
| or eax, DWORD [DWBLOCK(2,0,esi,SIZEOF_JCOEF)] |
| jnz short .columnDCT |
| |
| movq mm0, MMWORD [MMBLOCK(1,0,esi,SIZEOF_JCOEF)] |
| movq mm1, MMWORD [MMBLOCK(2,0,esi,SIZEOF_JCOEF)] |
| por mm0, MMWORD [MMBLOCK(3,0,esi,SIZEOF_JCOEF)] |
| por mm1, MMWORD [MMBLOCK(4,0,esi,SIZEOF_JCOEF)] |
| por mm0, MMWORD [MMBLOCK(5,0,esi,SIZEOF_JCOEF)] |
| por mm1, MMWORD [MMBLOCK(6,0,esi,SIZEOF_JCOEF)] |
| por mm0, MMWORD [MMBLOCK(7,0,esi,SIZEOF_JCOEF)] |
| por mm1,mm0 |
| packsswb mm1,mm1 |
| movd eax,mm1 |
| test eax,eax |
| jnz short .columnDCT |
| |
| ; -- AC terms all zero |
| |
| movq mm0, MMWORD [MMBLOCK(0,0,esi,SIZEOF_JCOEF)] |
| pmullw mm0, MMWORD [MMBLOCK(0,0,edx,SIZEOF_IFAST_MULT_TYPE)] |
| |
| movq mm2,mm0 ; mm0=in0=(00 01 02 03) |
| punpcklwd mm0,mm0 ; mm0=(00 00 01 01) |
| punpckhwd mm2,mm2 ; mm2=(02 02 03 03) |
| |
| movq mm1,mm0 |
| punpckldq mm0,mm0 ; mm0=(00 00 00 00) |
| punpckhdq mm1,mm1 ; mm1=(01 01 01 01) |
| movq mm3,mm2 |
| punpckldq mm2,mm2 ; mm2=(02 02 02 02) |
| punpckhdq mm3,mm3 ; mm3=(03 03 03 03) |
| |
| movq MMWORD [MMBLOCK(0,0,edi,SIZEOF_JCOEF)], mm0 |
| movq MMWORD [MMBLOCK(0,1,edi,SIZEOF_JCOEF)], mm0 |
| movq MMWORD [MMBLOCK(1,0,edi,SIZEOF_JCOEF)], mm1 |
| movq MMWORD [MMBLOCK(1,1,edi,SIZEOF_JCOEF)], mm1 |
| movq MMWORD [MMBLOCK(2,0,edi,SIZEOF_JCOEF)], mm2 |
| movq MMWORD [MMBLOCK(2,1,edi,SIZEOF_JCOEF)], mm2 |
| movq MMWORD [MMBLOCK(3,0,edi,SIZEOF_JCOEF)], mm3 |
| movq MMWORD [MMBLOCK(3,1,edi,SIZEOF_JCOEF)], mm3 |
| jmp near .nextcolumn |
| alignx 16,7 |
| %endif |
| .columnDCT: |
| |
| ; -- Even part |
| |
| movq mm0, MMWORD [MMBLOCK(0,0,esi,SIZEOF_JCOEF)] |
| movq mm1, MMWORD [MMBLOCK(2,0,esi,SIZEOF_JCOEF)] |
| pmullw mm0, MMWORD [MMBLOCK(0,0,edx,SIZEOF_IFAST_MULT_TYPE)] |
| pmullw mm1, MMWORD [MMBLOCK(2,0,edx,SIZEOF_IFAST_MULT_TYPE)] |
| movq mm2, MMWORD [MMBLOCK(4,0,esi,SIZEOF_JCOEF)] |
| movq mm3, MMWORD [MMBLOCK(6,0,esi,SIZEOF_JCOEF)] |
| pmullw mm2, MMWORD [MMBLOCK(4,0,edx,SIZEOF_IFAST_MULT_TYPE)] |
| pmullw mm3, MMWORD [MMBLOCK(6,0,edx,SIZEOF_IFAST_MULT_TYPE)] |
| |
| movq mm4,mm0 |
| movq mm5,mm1 |
| psubw mm0,mm2 ; mm0=tmp11 |
| psubw mm1,mm3 |
| paddw mm4,mm2 ; mm4=tmp10 |
| paddw mm5,mm3 ; mm5=tmp13 |
| |
| psllw mm1,PRE_MULTIPLY_SCALE_BITS |
| pmulhw mm1,[GOTOFF(ebx,PW_F1414)] |
| psubw mm1,mm5 ; mm1=tmp12 |
| |
| movq mm6,mm4 |
| movq mm7,mm0 |
| psubw mm4,mm5 ; mm4=tmp3 |
| psubw mm0,mm1 ; mm0=tmp2 |
| paddw mm6,mm5 ; mm6=tmp0 |
| paddw mm7,mm1 ; mm7=tmp1 |
| |
| movq MMWORD [wk(1)], mm4 ; wk(1)=tmp3 |
| movq MMWORD [wk(0)], mm0 ; wk(0)=tmp2 |
| |
| ; -- Odd part |
| |
| movq mm2, MMWORD [MMBLOCK(1,0,esi,SIZEOF_JCOEF)] |
| movq mm3, MMWORD [MMBLOCK(3,0,esi,SIZEOF_JCOEF)] |
| pmullw mm2, MMWORD [MMBLOCK(1,0,edx,SIZEOF_IFAST_MULT_TYPE)] |
| pmullw mm3, MMWORD [MMBLOCK(3,0,edx,SIZEOF_IFAST_MULT_TYPE)] |
| movq mm5, MMWORD [MMBLOCK(5,0,esi,SIZEOF_JCOEF)] |
| movq mm1, MMWORD [MMBLOCK(7,0,esi,SIZEOF_JCOEF)] |
| pmullw mm5, MMWORD [MMBLOCK(5,0,edx,SIZEOF_IFAST_MULT_TYPE)] |
| pmullw mm1, MMWORD [MMBLOCK(7,0,edx,SIZEOF_IFAST_MULT_TYPE)] |
| |
| movq mm4,mm2 |
| movq mm0,mm5 |
| psubw mm2,mm1 ; mm2=z12 |
| psubw mm5,mm3 ; mm5=z10 |
| paddw mm4,mm1 ; mm4=z11 |
| paddw mm0,mm3 ; mm0=z13 |
| |
| movq mm1,mm5 ; mm1=z10(unscaled) |
| psllw mm2,PRE_MULTIPLY_SCALE_BITS |
| psllw mm5,PRE_MULTIPLY_SCALE_BITS |
| |
| movq mm3,mm4 |
| psubw mm4,mm0 |
| paddw mm3,mm0 ; mm3=tmp7 |
| |
| psllw mm4,PRE_MULTIPLY_SCALE_BITS |
| pmulhw mm4,[GOTOFF(ebx,PW_F1414)] ; mm4=tmp11 |
| |
| ; To avoid overflow... |
| ; |
| ; (Original) |
| ; tmp12 = -2.613125930 * z10 + z5; |
| ; |
| ; (This implementation) |
| ; tmp12 = (-1.613125930 - 1) * z10 + z5; |
| ; = -1.613125930 * z10 - z10 + z5; |
| |
| movq mm0,mm5 |
| paddw mm5,mm2 |
| pmulhw mm5,[GOTOFF(ebx,PW_F1847)] ; mm5=z5 |
| pmulhw mm0,[GOTOFF(ebx,PW_MF1613)] |
| pmulhw mm2,[GOTOFF(ebx,PW_F1082)] |
| psubw mm0,mm1 |
| psubw mm2,mm5 ; mm2=tmp10 |
| paddw mm0,mm5 ; mm0=tmp12 |
| |
| ; -- Final output stage |
| |
| psubw mm0,mm3 ; mm0=tmp6 |
| movq mm1,mm6 |
| movq mm5,mm7 |
| paddw mm6,mm3 ; mm6=data0=(00 01 02 03) |
| paddw mm7,mm0 ; mm7=data1=(10 11 12 13) |
| psubw mm1,mm3 ; mm1=data7=(70 71 72 73) |
| psubw mm5,mm0 ; mm5=data6=(60 61 62 63) |
| psubw mm4,mm0 ; mm4=tmp5 |
| |
| movq mm3,mm6 ; transpose coefficients(phase 1) |
| punpcklwd mm6,mm7 ; mm6=(00 10 01 11) |
| punpckhwd mm3,mm7 ; mm3=(02 12 03 13) |
| movq mm0,mm5 ; transpose coefficients(phase 1) |
| punpcklwd mm5,mm1 ; mm5=(60 70 61 71) |
| punpckhwd mm0,mm1 ; mm0=(62 72 63 73) |
| |
| movq mm7, MMWORD [wk(0)] ; mm7=tmp2 |
| movq mm1, MMWORD [wk(1)] ; mm1=tmp3 |
| |
| movq MMWORD [wk(0)], mm5 ; wk(0)=(60 70 61 71) |
| movq MMWORD [wk(1)], mm0 ; wk(1)=(62 72 63 73) |
| |
| paddw mm2,mm4 ; mm2=tmp4 |
| movq mm5,mm7 |
| movq mm0,mm1 |
| paddw mm7,mm4 ; mm7=data2=(20 21 22 23) |
| paddw mm1,mm2 ; mm1=data4=(40 41 42 43) |
| psubw mm5,mm4 ; mm5=data5=(50 51 52 53) |
| psubw mm0,mm2 ; mm0=data3=(30 31 32 33) |
| |
| movq mm4,mm7 ; transpose coefficients(phase 1) |
| punpcklwd mm7,mm0 ; mm7=(20 30 21 31) |
| punpckhwd mm4,mm0 ; mm4=(22 32 23 33) |
| movq mm2,mm1 ; transpose coefficients(phase 1) |
| punpcklwd mm1,mm5 ; mm1=(40 50 41 51) |
| punpckhwd mm2,mm5 ; mm2=(42 52 43 53) |
| |
| movq mm0,mm6 ; transpose coefficients(phase 2) |
| punpckldq mm6,mm7 ; mm6=(00 10 20 30) |
| punpckhdq mm0,mm7 ; mm0=(01 11 21 31) |
| movq mm5,mm3 ; transpose coefficients(phase 2) |
| punpckldq mm3,mm4 ; mm3=(02 12 22 32) |
| punpckhdq mm5,mm4 ; mm5=(03 13 23 33) |
| |
| movq mm7, MMWORD [wk(0)] ; mm7=(60 70 61 71) |
| movq mm4, MMWORD [wk(1)] ; mm4=(62 72 63 73) |
| |
| movq MMWORD [MMBLOCK(0,0,edi,SIZEOF_JCOEF)], mm6 |
| movq MMWORD [MMBLOCK(1,0,edi,SIZEOF_JCOEF)], mm0 |
| movq MMWORD [MMBLOCK(2,0,edi,SIZEOF_JCOEF)], mm3 |
| movq MMWORD [MMBLOCK(3,0,edi,SIZEOF_JCOEF)], mm5 |
| |
| movq mm6,mm1 ; transpose coefficients(phase 2) |
| punpckldq mm1,mm7 ; mm1=(40 50 60 70) |
| punpckhdq mm6,mm7 ; mm6=(41 51 61 71) |
| movq mm0,mm2 ; transpose coefficients(phase 2) |
| punpckldq mm2,mm4 ; mm2=(42 52 62 72) |
| punpckhdq mm0,mm4 ; mm0=(43 53 63 73) |
| |
| movq MMWORD [MMBLOCK(0,1,edi,SIZEOF_JCOEF)], mm1 |
| movq MMWORD [MMBLOCK(1,1,edi,SIZEOF_JCOEF)], mm6 |
| movq MMWORD [MMBLOCK(2,1,edi,SIZEOF_JCOEF)], mm2 |
| movq MMWORD [MMBLOCK(3,1,edi,SIZEOF_JCOEF)], mm0 |
| |
| .nextcolumn: |
| add esi, byte 4*SIZEOF_JCOEF ; coef_block |
| add edx, byte 4*SIZEOF_IFAST_MULT_TYPE ; quantptr |
| add edi, byte 4*DCTSIZE*SIZEOF_JCOEF ; wsptr |
| dec ecx ; ctr |
| jnz near .columnloop |
| |
| ; ---- Pass 2: process rows from work array, store into output array. |
| |
| mov eax, [original_ebp] |
| lea esi, [workspace] ; JCOEF *wsptr |
| mov edi, JSAMPARRAY [output_buf(eax)] ; (JSAMPROW *) |
| mov eax, JDIMENSION [output_col(eax)] |
| mov ecx, DCTSIZE/4 ; ctr |
| alignx 16,7 |
| .rowloop: |
| |
| ; -- Even part |
| |
| movq mm0, MMWORD [MMBLOCK(0,0,esi,SIZEOF_JCOEF)] |
| movq mm1, MMWORD [MMBLOCK(2,0,esi,SIZEOF_JCOEF)] |
| movq mm2, MMWORD [MMBLOCK(4,0,esi,SIZEOF_JCOEF)] |
| movq mm3, MMWORD [MMBLOCK(6,0,esi,SIZEOF_JCOEF)] |
| |
| movq mm4,mm0 |
| movq mm5,mm1 |
| psubw mm0,mm2 ; mm0=tmp11 |
| psubw mm1,mm3 |
| paddw mm4,mm2 ; mm4=tmp10 |
| paddw mm5,mm3 ; mm5=tmp13 |
| |
| psllw mm1,PRE_MULTIPLY_SCALE_BITS |
| pmulhw mm1,[GOTOFF(ebx,PW_F1414)] |
| psubw mm1,mm5 ; mm1=tmp12 |
| |
| movq mm6,mm4 |
| movq mm7,mm0 |
| psubw mm4,mm5 ; mm4=tmp3 |
| psubw mm0,mm1 ; mm0=tmp2 |
| paddw mm6,mm5 ; mm6=tmp0 |
| paddw mm7,mm1 ; mm7=tmp1 |
| |
| movq MMWORD [wk(1)], mm4 ; wk(1)=tmp3 |
| movq MMWORD [wk(0)], mm0 ; wk(0)=tmp2 |
| |
| ; -- Odd part |
| |
| movq mm2, MMWORD [MMBLOCK(1,0,esi,SIZEOF_JCOEF)] |
| movq mm3, MMWORD [MMBLOCK(3,0,esi,SIZEOF_JCOEF)] |
| movq mm5, MMWORD [MMBLOCK(5,0,esi,SIZEOF_JCOEF)] |
| movq mm1, MMWORD [MMBLOCK(7,0,esi,SIZEOF_JCOEF)] |
| |
| movq mm4,mm2 |
| movq mm0,mm5 |
| psubw mm2,mm1 ; mm2=z12 |
| psubw mm5,mm3 ; mm5=z10 |
| paddw mm4,mm1 ; mm4=z11 |
| paddw mm0,mm3 ; mm0=z13 |
| |
| movq mm1,mm5 ; mm1=z10(unscaled) |
| psllw mm2,PRE_MULTIPLY_SCALE_BITS |
| psllw mm5,PRE_MULTIPLY_SCALE_BITS |
| |
| movq mm3,mm4 |
| psubw mm4,mm0 |
| paddw mm3,mm0 ; mm3=tmp7 |
| |
| psllw mm4,PRE_MULTIPLY_SCALE_BITS |
| pmulhw mm4,[GOTOFF(ebx,PW_F1414)] ; mm4=tmp11 |
| |
| ; To avoid overflow... |
| ; |
| ; (Original) |
| ; tmp12 = -2.613125930 * z10 + z5; |
| ; |
| ; (This implementation) |
| ; tmp12 = (-1.613125930 - 1) * z10 + z5; |
| ; = -1.613125930 * z10 - z10 + z5; |
| |
| movq mm0,mm5 |
| paddw mm5,mm2 |
| pmulhw mm5,[GOTOFF(ebx,PW_F1847)] ; mm5=z5 |
| pmulhw mm0,[GOTOFF(ebx,PW_MF1613)] |
| pmulhw mm2,[GOTOFF(ebx,PW_F1082)] |
| psubw mm0,mm1 |
| psubw mm2,mm5 ; mm2=tmp10 |
| paddw mm0,mm5 ; mm0=tmp12 |
| |
| ; -- Final output stage |
| |
| psubw mm0,mm3 ; mm0=tmp6 |
| movq mm1,mm6 |
| movq mm5,mm7 |
| paddw mm6,mm3 ; mm6=data0=(00 10 20 30) |
| paddw mm7,mm0 ; mm7=data1=(01 11 21 31) |
| psraw mm6,(PASS1_BITS+3) ; descale |
| psraw mm7,(PASS1_BITS+3) ; descale |
| psubw mm1,mm3 ; mm1=data7=(07 17 27 37) |
| psubw mm5,mm0 ; mm5=data6=(06 16 26 36) |
| psraw mm1,(PASS1_BITS+3) ; descale |
| psraw mm5,(PASS1_BITS+3) ; descale |
| psubw mm4,mm0 ; mm4=tmp5 |
| |
| packsswb mm6,mm5 ; mm6=(00 10 20 30 06 16 26 36) |
| packsswb mm7,mm1 ; mm7=(01 11 21 31 07 17 27 37) |
| |
| movq mm3, MMWORD [wk(0)] ; mm3=tmp2 |
| movq mm0, MMWORD [wk(1)] ; mm0=tmp3 |
| |
| paddw mm2,mm4 ; mm2=tmp4 |
| movq mm5,mm3 |
| movq mm1,mm0 |
| paddw mm3,mm4 ; mm3=data2=(02 12 22 32) |
| paddw mm0,mm2 ; mm0=data4=(04 14 24 34) |
| psraw mm3,(PASS1_BITS+3) ; descale |
| psraw mm0,(PASS1_BITS+3) ; descale |
| psubw mm5,mm4 ; mm5=data5=(05 15 25 35) |
| psubw mm1,mm2 ; mm1=data3=(03 13 23 33) |
| psraw mm5,(PASS1_BITS+3) ; descale |
| psraw mm1,(PASS1_BITS+3) ; descale |
| |
| movq mm4,[GOTOFF(ebx,PB_CENTERJSAMP)] ; mm4=[PB_CENTERJSAMP] |
| |
| packsswb mm3,mm0 ; mm3=(02 12 22 32 04 14 24 34) |
| packsswb mm1,mm5 ; mm1=(03 13 23 33 05 15 25 35) |
| |
| paddb mm6,mm4 |
| paddb mm7,mm4 |
| paddb mm3,mm4 |
| paddb mm1,mm4 |
| |
| movq mm2,mm6 ; transpose coefficients(phase 1) |
| punpcklbw mm6,mm7 ; mm6=(00 01 10 11 20 21 30 31) |
| punpckhbw mm2,mm7 ; mm2=(06 07 16 17 26 27 36 37) |
| movq mm0,mm3 ; transpose coefficients(phase 1) |
| punpcklbw mm3,mm1 ; mm3=(02 03 12 13 22 23 32 33) |
| punpckhbw mm0,mm1 ; mm0=(04 05 14 15 24 25 34 35) |
| |
| movq mm5,mm6 ; transpose coefficients(phase 2) |
| punpcklwd mm6,mm3 ; mm6=(00 01 02 03 10 11 12 13) |
| punpckhwd mm5,mm3 ; mm5=(20 21 22 23 30 31 32 33) |
| movq mm4,mm0 ; transpose coefficients(phase 2) |
| punpcklwd mm0,mm2 ; mm0=(04 05 06 07 14 15 16 17) |
| punpckhwd mm4,mm2 ; mm4=(24 25 26 27 34 35 36 37) |
| |
| movq mm7,mm6 ; transpose coefficients(phase 3) |
| punpckldq mm6,mm0 ; mm6=(00 01 02 03 04 05 06 07) |
| punpckhdq mm7,mm0 ; mm7=(10 11 12 13 14 15 16 17) |
| movq mm1,mm5 ; transpose coefficients(phase 3) |
| punpckldq mm5,mm4 ; mm5=(20 21 22 23 24 25 26 27) |
| punpckhdq mm1,mm4 ; mm1=(30 31 32 33 34 35 36 37) |
| |
| pushpic ebx ; save GOT address |
| |
| mov edx, JSAMPROW [edi+0*SIZEOF_JSAMPROW] |
| mov ebx, JSAMPROW [edi+1*SIZEOF_JSAMPROW] |
| movq MMWORD [edx+eax*SIZEOF_JSAMPLE], mm6 |
| movq MMWORD [ebx+eax*SIZEOF_JSAMPLE], mm7 |
| mov edx, JSAMPROW [edi+2*SIZEOF_JSAMPROW] |
| mov ebx, JSAMPROW [edi+3*SIZEOF_JSAMPROW] |
| movq MMWORD [edx+eax*SIZEOF_JSAMPLE], mm5 |
| movq MMWORD [ebx+eax*SIZEOF_JSAMPLE], mm1 |
| |
| poppic ebx ; restore GOT address |
| |
| add esi, byte 4*SIZEOF_JCOEF ; wsptr |
| add edi, byte 4*SIZEOF_JSAMPROW |
| dec ecx ; ctr |
| jnz near .rowloop |
| |
| emms ; empty MMX state |
| |
| pop edi |
| pop esi |
| ; pop edx ; need not be preserved |
| ; pop ecx ; need not be preserved |
| pop ebx |
| mov esp,ebp ; esp <- aligned ebp |
| pop esp ; esp <- original ebp |
| pop ebp |
| ret |
| |
| ; For some reason, the OS X linker does not honor the request to align the |
| ; segment unless we do this. |
| align 16 |
