| ; |
| ; jfdctfst.asm - fast integer FDCT (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 forward DCT (Discrete Cosine Transform). The following code is |
| ; based directly on the IJG's original jfdctfst.c; see the jfdctfst.c |
| ; for more details. |
| ; |
| ; [TAB8] |
| |
| %include "jsimdext.inc" |
| %include "jdct.inc" |
| |
| ; -------------------------------------------------------------------------- |
| |
| %define CONST_BITS 8 ; 14 is also OK. |
| |
| %if CONST_BITS == 8 |
| F_0_382 equ 98 ; FIX(0.382683433) |
| F_0_541 equ 139 ; FIX(0.541196100) |
| F_0_707 equ 181 ; FIX(0.707106781) |
| F_1_306 equ 334 ; FIX(1.306562965) |
| %else |
| ; NASM cannot do compile-time arithmetic on floating-point constants. |
| %define DESCALE(x,n) (((x)+(1<<((n)-1)))>>(n)) |
| F_0_382 equ DESCALE( 410903207,30-CONST_BITS) ; FIX(0.382683433) |
| F_0_541 equ DESCALE( 581104887,30-CONST_BITS) ; FIX(0.541196100) |
| F_0_707 equ DESCALE( 759250124,30-CONST_BITS) ; FIX(0.707106781) |
| F_1_306 equ DESCALE(1402911301,30-CONST_BITS) ; FIX(1.306562965) |
| %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_fdct_ifast_mmx) |
| |
| EXTN(jconst_fdct_ifast_mmx): |
| |
| PW_F0707 times 4 dw F_0_707 << CONST_SHIFT |
| PW_F0382 times 4 dw F_0_382 << CONST_SHIFT |
| PW_F0541 times 4 dw F_0_541 << CONST_SHIFT |
| PW_F1306 times 4 dw F_1_306 << CONST_SHIFT |
| |
| alignz 16 |
| |
| ; -------------------------------------------------------------------------- |
| SECTION SEG_TEXT |
| BITS 32 |
| ; |
| ; Perform the forward DCT on one block of samples. |
| ; |
| ; GLOBAL(void) |
| ; jsimd_fdct_ifast_mmx (DCTELEM *data) |
| ; |
| |
| %define data(b) (b)+8 ; DCTELEM *data |
| |
| %define original_ebp ebp+0 |
| %define wk(i) ebp-(WK_NUM-(i))*SIZEOF_MMWORD ; mmword wk[WK_NUM] |
| %define WK_NUM 2 |
| |
| align 16 |
| global EXTN(jsimd_fdct_ifast_mmx) |
| |
| EXTN(jsimd_fdct_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, [wk(0)] |
| pushpic ebx |
| ; push ecx ; need not be preserved |
| ; push edx ; need not be preserved |
| ; push esi ; unused |
| ; push edi ; unused |
| |
| get_GOT ebx ; get GOT address |
| |
| ; ---- Pass 1: process rows. |
| |
| mov edx, POINTER [data(eax)] ; (DCTELEM *) |
| mov ecx, DCTSIZE/4 |
| alignx 16,7 |
| .rowloop: |
| |
| movq mm0, MMWORD [MMBLOCK(2,0,edx,SIZEOF_DCTELEM)] |
| movq mm1, MMWORD [MMBLOCK(3,0,edx,SIZEOF_DCTELEM)] |
| movq mm2, MMWORD [MMBLOCK(2,1,edx,SIZEOF_DCTELEM)] |
| movq mm3, MMWORD [MMBLOCK(3,1,edx,SIZEOF_DCTELEM)] |
| |
| ; mm0=(20 21 22 23), mm2=(24 25 26 27) |
| ; mm1=(30 31 32 33), mm3=(34 35 36 37) |
| |
| movq mm4,mm0 ; transpose coefficients(phase 1) |
| punpcklwd mm0,mm1 ; mm0=(20 30 21 31) |
| punpckhwd mm4,mm1 ; mm4=(22 32 23 33) |
| movq mm5,mm2 ; transpose coefficients(phase 1) |
| punpcklwd mm2,mm3 ; mm2=(24 34 25 35) |
| punpckhwd mm5,mm3 ; mm5=(26 36 27 37) |
| |
| movq mm6, MMWORD [MMBLOCK(0,0,edx,SIZEOF_DCTELEM)] |
| movq mm7, MMWORD [MMBLOCK(1,0,edx,SIZEOF_DCTELEM)] |
| movq mm1, MMWORD [MMBLOCK(0,1,edx,SIZEOF_DCTELEM)] |
| movq mm3, MMWORD [MMBLOCK(1,1,edx,SIZEOF_DCTELEM)] |
| |
| ; mm6=(00 01 02 03), mm1=(04 05 06 07) |
| ; mm7=(10 11 12 13), mm3=(14 15 16 17) |
| |
| movq MMWORD [wk(0)], mm4 ; wk(0)=(22 32 23 33) |
| movq MMWORD [wk(1)], mm2 ; wk(1)=(24 34 25 35) |
| |
| movq mm4,mm6 ; transpose coefficients(phase 1) |
| punpcklwd mm6,mm7 ; mm6=(00 10 01 11) |
| punpckhwd mm4,mm7 ; mm4=(02 12 03 13) |
| movq mm2,mm1 ; transpose coefficients(phase 1) |
| punpcklwd mm1,mm3 ; mm1=(04 14 05 15) |
| punpckhwd mm2,mm3 ; mm2=(06 16 07 17) |
| |
| movq mm7,mm6 ; transpose coefficients(phase 2) |
| punpckldq mm6,mm0 ; mm6=(00 10 20 30)=data0 |
| punpckhdq mm7,mm0 ; mm7=(01 11 21 31)=data1 |
| movq mm3,mm2 ; transpose coefficients(phase 2) |
| punpckldq mm2,mm5 ; mm2=(06 16 26 36)=data6 |
| punpckhdq mm3,mm5 ; mm3=(07 17 27 37)=data7 |
| |
| movq mm0,mm7 |
| movq mm5,mm6 |
| psubw mm7,mm2 ; mm7=data1-data6=tmp6 |
| psubw mm6,mm3 ; mm6=data0-data7=tmp7 |
| paddw mm0,mm2 ; mm0=data1+data6=tmp1 |
| paddw mm5,mm3 ; mm5=data0+data7=tmp0 |
| |
| movq mm2, MMWORD [wk(0)] ; mm2=(22 32 23 33) |
| movq mm3, MMWORD [wk(1)] ; mm3=(24 34 25 35) |
| movq MMWORD [wk(0)], mm7 ; wk(0)=tmp6 |
| movq MMWORD [wk(1)], mm6 ; wk(1)=tmp7 |
| |
| movq mm7,mm4 ; transpose coefficients(phase 2) |
| punpckldq mm4,mm2 ; mm4=(02 12 22 32)=data2 |
| punpckhdq mm7,mm2 ; mm7=(03 13 23 33)=data3 |
| movq mm6,mm1 ; transpose coefficients(phase 2) |
| punpckldq mm1,mm3 ; mm1=(04 14 24 34)=data4 |
| punpckhdq mm6,mm3 ; mm6=(05 15 25 35)=data5 |
| |
| movq mm2,mm7 |
| movq mm3,mm4 |
| paddw mm7,mm1 ; mm7=data3+data4=tmp3 |
| paddw mm4,mm6 ; mm4=data2+data5=tmp2 |
| psubw mm2,mm1 ; mm2=data3-data4=tmp4 |
| psubw mm3,mm6 ; mm3=data2-data5=tmp5 |
| |
| ; -- Even part |
| |
| movq mm1,mm5 |
| movq mm6,mm0 |
| psubw mm5,mm7 ; mm5=tmp13 |
| psubw mm0,mm4 ; mm0=tmp12 |
| paddw mm1,mm7 ; mm1=tmp10 |
| paddw mm6,mm4 ; mm6=tmp11 |
| |
| paddw mm0,mm5 |
| psllw mm0,PRE_MULTIPLY_SCALE_BITS |
| pmulhw mm0,[GOTOFF(ebx,PW_F0707)] ; mm0=z1 |
| |
| movq mm7,mm1 |
| movq mm4,mm5 |
| psubw mm1,mm6 ; mm1=data4 |
| psubw mm5,mm0 ; mm5=data6 |
| paddw mm7,mm6 ; mm7=data0 |
| paddw mm4,mm0 ; mm4=data2 |
| |
| movq MMWORD [MMBLOCK(0,1,edx,SIZEOF_DCTELEM)], mm1 |
| movq MMWORD [MMBLOCK(2,1,edx,SIZEOF_DCTELEM)], mm5 |
| movq MMWORD [MMBLOCK(0,0,edx,SIZEOF_DCTELEM)], mm7 |
| movq MMWORD [MMBLOCK(2,0,edx,SIZEOF_DCTELEM)], mm4 |
| |
| ; -- Odd part |
| |
| movq mm6, MMWORD [wk(0)] ; mm6=tmp6 |
| movq mm0, MMWORD [wk(1)] ; mm0=tmp7 |
| |
| paddw mm2,mm3 ; mm2=tmp10 |
| paddw mm3,mm6 ; mm3=tmp11 |
| paddw mm6,mm0 ; mm6=tmp12, mm0=tmp7 |
| |
| psllw mm2,PRE_MULTIPLY_SCALE_BITS |
| psllw mm6,PRE_MULTIPLY_SCALE_BITS |
| |
| psllw mm3,PRE_MULTIPLY_SCALE_BITS |
| pmulhw mm3,[GOTOFF(ebx,PW_F0707)] ; mm3=z3 |
| |
| movq mm1,mm2 ; mm1=tmp10 |
| psubw mm2,mm6 |
| pmulhw mm2,[GOTOFF(ebx,PW_F0382)] ; mm2=z5 |
| pmulhw mm1,[GOTOFF(ebx,PW_F0541)] ; mm1=MULTIPLY(tmp10,FIX_0_54119610) |
| pmulhw mm6,[GOTOFF(ebx,PW_F1306)] ; mm6=MULTIPLY(tmp12,FIX_1_30656296) |
| paddw mm1,mm2 ; mm1=z2 |
| paddw mm6,mm2 ; mm6=z4 |
| |
| movq mm5,mm0 |
| psubw mm0,mm3 ; mm0=z13 |
| paddw mm5,mm3 ; mm5=z11 |
| |
| movq mm7,mm0 |
| movq mm4,mm5 |
| psubw mm0,mm1 ; mm0=data3 |
| psubw mm5,mm6 ; mm5=data7 |
| paddw mm7,mm1 ; mm7=data5 |
| paddw mm4,mm6 ; mm4=data1 |
| |
| movq MMWORD [MMBLOCK(3,0,edx,SIZEOF_DCTELEM)], mm0 |
| movq MMWORD [MMBLOCK(3,1,edx,SIZEOF_DCTELEM)], mm5 |
| movq MMWORD [MMBLOCK(1,1,edx,SIZEOF_DCTELEM)], mm7 |
| movq MMWORD [MMBLOCK(1,0,edx,SIZEOF_DCTELEM)], mm4 |
| |
| add edx, byte 4*DCTSIZE*SIZEOF_DCTELEM |
| dec ecx |
| jnz near .rowloop |
| |
| ; ---- Pass 2: process columns. |
| |
| mov edx, POINTER [data(eax)] ; (DCTELEM *) |
| mov ecx, DCTSIZE/4 |
| alignx 16,7 |
| .columnloop: |
| |
| movq mm0, MMWORD [MMBLOCK(2,0,edx,SIZEOF_DCTELEM)] |
| movq mm1, MMWORD [MMBLOCK(3,0,edx,SIZEOF_DCTELEM)] |
| movq mm2, MMWORD [MMBLOCK(6,0,edx,SIZEOF_DCTELEM)] |
| movq mm3, MMWORD [MMBLOCK(7,0,edx,SIZEOF_DCTELEM)] |
| |
| ; mm0=(02 12 22 32), mm2=(42 52 62 72) |
| ; mm1=(03 13 23 33), mm3=(43 53 63 73) |
| |
| movq mm4,mm0 ; transpose coefficients(phase 1) |
| punpcklwd mm0,mm1 ; mm0=(02 03 12 13) |
| punpckhwd mm4,mm1 ; mm4=(22 23 32 33) |
| movq mm5,mm2 ; transpose coefficients(phase 1) |
| punpcklwd mm2,mm3 ; mm2=(42 43 52 53) |
| punpckhwd mm5,mm3 ; mm5=(62 63 72 73) |
| |
| movq mm6, MMWORD [MMBLOCK(0,0,edx,SIZEOF_DCTELEM)] |
| movq mm7, MMWORD [MMBLOCK(1,0,edx,SIZEOF_DCTELEM)] |
| movq mm1, MMWORD [MMBLOCK(4,0,edx,SIZEOF_DCTELEM)] |
| movq mm3, MMWORD [MMBLOCK(5,0,edx,SIZEOF_DCTELEM)] |
| |
| ; mm6=(00 10 20 30), mm1=(40 50 60 70) |
| ; mm7=(01 11 21 31), mm3=(41 51 61 71) |
| |
| movq MMWORD [wk(0)], mm4 ; wk(0)=(22 23 32 33) |
| movq MMWORD [wk(1)], mm2 ; wk(1)=(42 43 52 53) |
| |
| movq mm4,mm6 ; transpose coefficients(phase 1) |
| punpcklwd mm6,mm7 ; mm6=(00 01 10 11) |
| punpckhwd mm4,mm7 ; mm4=(20 21 30 31) |
| movq mm2,mm1 ; transpose coefficients(phase 1) |
| punpcklwd mm1,mm3 ; mm1=(40 41 50 51) |
| punpckhwd mm2,mm3 ; mm2=(60 61 70 71) |
| |
| movq mm7,mm6 ; transpose coefficients(phase 2) |
| punpckldq mm6,mm0 ; mm6=(00 01 02 03)=data0 |
| punpckhdq mm7,mm0 ; mm7=(10 11 12 13)=data1 |
| movq mm3,mm2 ; transpose coefficients(phase 2) |
| punpckldq mm2,mm5 ; mm2=(60 61 62 63)=data6 |
| punpckhdq mm3,mm5 ; mm3=(70 71 72 73)=data7 |
| |
| movq mm0,mm7 |
| movq mm5,mm6 |
| psubw mm7,mm2 ; mm7=data1-data6=tmp6 |
| psubw mm6,mm3 ; mm6=data0-data7=tmp7 |
| paddw mm0,mm2 ; mm0=data1+data6=tmp1 |
| paddw mm5,mm3 ; mm5=data0+data7=tmp0 |
| |
| movq mm2, MMWORD [wk(0)] ; mm2=(22 23 32 33) |
| movq mm3, MMWORD [wk(1)] ; mm3=(42 43 52 53) |
| movq MMWORD [wk(0)], mm7 ; wk(0)=tmp6 |
| movq MMWORD [wk(1)], mm6 ; wk(1)=tmp7 |
| |
| movq mm7,mm4 ; transpose coefficients(phase 2) |
| punpckldq mm4,mm2 ; mm4=(20 21 22 23)=data2 |
| punpckhdq mm7,mm2 ; mm7=(30 31 32 33)=data3 |
| movq mm6,mm1 ; transpose coefficients(phase 2) |
| punpckldq mm1,mm3 ; mm1=(40 41 42 43)=data4 |
| punpckhdq mm6,mm3 ; mm6=(50 51 52 53)=data5 |
| |
| movq mm2,mm7 |
| movq mm3,mm4 |
| paddw mm7,mm1 ; mm7=data3+data4=tmp3 |
| paddw mm4,mm6 ; mm4=data2+data5=tmp2 |
| psubw mm2,mm1 ; mm2=data3-data4=tmp4 |
| psubw mm3,mm6 ; mm3=data2-data5=tmp5 |
| |
| ; -- Even part |
| |
| movq mm1,mm5 |
| movq mm6,mm0 |
| psubw mm5,mm7 ; mm5=tmp13 |
| psubw mm0,mm4 ; mm0=tmp12 |
| paddw mm1,mm7 ; mm1=tmp10 |
| paddw mm6,mm4 ; mm6=tmp11 |
| |
| paddw mm0,mm5 |
| psllw mm0,PRE_MULTIPLY_SCALE_BITS |
| pmulhw mm0,[GOTOFF(ebx,PW_F0707)] ; mm0=z1 |
| |
| movq mm7,mm1 |
| movq mm4,mm5 |
| psubw mm1,mm6 ; mm1=data4 |
| psubw mm5,mm0 ; mm5=data6 |
| paddw mm7,mm6 ; mm7=data0 |
| paddw mm4,mm0 ; mm4=data2 |
| |
| movq MMWORD [MMBLOCK(4,0,edx,SIZEOF_DCTELEM)], mm1 |
| movq MMWORD [MMBLOCK(6,0,edx,SIZEOF_DCTELEM)], mm5 |
| movq MMWORD [MMBLOCK(0,0,edx,SIZEOF_DCTELEM)], mm7 |
| movq MMWORD [MMBLOCK(2,0,edx,SIZEOF_DCTELEM)], mm4 |
| |
| ; -- Odd part |
| |
| movq mm6, MMWORD [wk(0)] ; mm6=tmp6 |
| movq mm0, MMWORD [wk(1)] ; mm0=tmp7 |
| |
| paddw mm2,mm3 ; mm2=tmp10 |
| paddw mm3,mm6 ; mm3=tmp11 |
| paddw mm6,mm0 ; mm6=tmp12, mm0=tmp7 |
| |
| psllw mm2,PRE_MULTIPLY_SCALE_BITS |
| psllw mm6,PRE_MULTIPLY_SCALE_BITS |
| |
| psllw mm3,PRE_MULTIPLY_SCALE_BITS |
| pmulhw mm3,[GOTOFF(ebx,PW_F0707)] ; mm3=z3 |
| |
| movq mm1,mm2 ; mm1=tmp10 |
| psubw mm2,mm6 |
| pmulhw mm2,[GOTOFF(ebx,PW_F0382)] ; mm2=z5 |
| pmulhw mm1,[GOTOFF(ebx,PW_F0541)] ; mm1=MULTIPLY(tmp10,FIX_0_54119610) |
| pmulhw mm6,[GOTOFF(ebx,PW_F1306)] ; mm6=MULTIPLY(tmp12,FIX_1_30656296) |
| paddw mm1,mm2 ; mm1=z2 |
| paddw mm6,mm2 ; mm6=z4 |
| |
| movq mm5,mm0 |
| psubw mm0,mm3 ; mm0=z13 |
| paddw mm5,mm3 ; mm5=z11 |
| |
| movq mm7,mm0 |
| movq mm4,mm5 |
| psubw mm0,mm1 ; mm0=data3 |
| psubw mm5,mm6 ; mm5=data7 |
| paddw mm7,mm1 ; mm7=data5 |
| paddw mm4,mm6 ; mm4=data1 |
| |
| movq MMWORD [MMBLOCK(3,0,edx,SIZEOF_DCTELEM)], mm0 |
| movq MMWORD [MMBLOCK(7,0,edx,SIZEOF_DCTELEM)], mm5 |
| movq MMWORD [MMBLOCK(5,0,edx,SIZEOF_DCTELEM)], mm7 |
| movq MMWORD [MMBLOCK(1,0,edx,SIZEOF_DCTELEM)], mm4 |
| |
| add edx, byte 4*SIZEOF_DCTELEM |
| dec ecx |
| jnz near .columnloop |
| |
| emms ; empty MMX state |
| |
| ; pop edi ; unused |
| ; pop esi ; unused |
| ; pop edx ; need not be preserved |
| ; pop ecx ; need not be preserved |
| poppic 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 |
