; ; jfdctint.asm - accurate integer FDCT (MMX) ; ; Copyright 2009 Pierre Ossman for Cendio AB ; ; Based on ; 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 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. ; ; [TAB8] %include "jsimdext.inc" %include "jdct.inc" ; -------------------------------------------------------------------------- %define CONST_BITS 13 %define PASS1_BITS 2 %define DESCALE_P1 (CONST_BITS-PASS1_BITS) %define DESCALE_P2 (CONST_BITS+PASS1_BITS) %if CONST_BITS == 13 F_0_298 equ 2446 ; FIX(0.298631336) F_0_390 equ 3196 ; FIX(0.390180644) F_0_541 equ 4433 ; FIX(0.541196100) F_0_765 equ 6270 ; FIX(0.765366865) F_0_899 equ 7373 ; FIX(0.899976223) F_1_175 equ 9633 ; FIX(1.175875602) F_1_501 equ 12299 ; FIX(1.501321110) F_1_847 equ 15137 ; FIX(1.847759065) F_1_961 equ 16069 ; FIX(1.961570560) F_2_053 equ 16819 ; FIX(2.053119869) F_2_562 equ 20995 ; FIX(2.562915447) F_3_072 equ 25172 ; FIX(3.072711026) %else ; NASM cannot do compile-time arithmetic on floating-point constants. %define DESCALE(x,n) (((x)+(1<<((n)-1)))>>(n)) F_0_298 equ DESCALE( 320652955,30-CONST_BITS) ; FIX(0.298631336) F_0_390 equ DESCALE( 418953276,30-CONST_BITS) ; FIX(0.390180644) F_0_541 equ DESCALE( 581104887,30-CONST_BITS) ; FIX(0.541196100) F_0_765 equ DESCALE( 821806413,30-CONST_BITS) ; FIX(0.765366865) F_0_899 equ DESCALE( 966342111,30-CONST_BITS) ; FIX(0.899976223) F_1_175 equ DESCALE(1262586813,30-CONST_BITS) ; FIX(1.175875602) F_1_501 equ DESCALE(1612031267,30-CONST_BITS) ; FIX(1.501321110) F_1_847 equ DESCALE(1984016188,30-CONST_BITS) ; FIX(1.847759065) F_1_961 equ DESCALE(2106220350,30-CONST_BITS) ; FIX(1.961570560) F_2_053 equ DESCALE(2204520673,30-CONST_BITS) ; FIX(2.053119869) F_2_562 equ DESCALE(2751909506,30-CONST_BITS) ; FIX(2.562915447) F_3_072 equ DESCALE(3299298341,30-CONST_BITS) ; FIX(3.072711026) %endif ; -------------------------------------------------------------------------- SECTION SEG_CONST alignz 16 global EXTN(jconst_fdct_islow_mmx) EXTN(jconst_fdct_islow_mmx): PW_F130_F054 times 2 dw (F_0_541+F_0_765), F_0_541 PW_F054_MF130 times 2 dw F_0_541, (F_0_541-F_1_847) PW_MF078_F117 times 2 dw (F_1_175-F_1_961), F_1_175 PW_F117_F078 times 2 dw F_1_175, (F_1_175-F_0_390) PW_MF060_MF089 times 2 dw (F_0_298-F_0_899),-F_0_899 PW_MF089_F060 times 2 dw -F_0_899, (F_1_501-F_0_899) PW_MF050_MF256 times 2 dw (F_2_053-F_2_562),-F_2_562 PW_MF256_F050 times 2 dw -F_2_562, (F_3_072-F_2_562) PD_DESCALE_P1 times 2 dd 1 << (DESCALE_P1-1) PD_DESCALE_P2 times 2 dd 1 << (DESCALE_P2-1) PW_DESCALE_P2X times 4 dw 1 << (PASS1_BITS-1) alignz 16 ; -------------------------------------------------------------------------- SECTION SEG_TEXT BITS 32 ; ; Perform the forward DCT on one block of samples. ; ; GLOBAL(void) ; jsimd_fdct_islow_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_islow_mmx) EXTN(jsimd_fdct_islow_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 paddw mm5,mm7 ; mm5=tmp10 paddw mm0,mm4 ; mm0=tmp11 psubw mm1,mm7 ; mm1=tmp13 psubw mm6,mm4 ; mm6=tmp12 movq mm7,mm5 paddw mm5,mm0 ; mm5=tmp10+tmp11 psubw mm7,mm0 ; mm7=tmp10-tmp11 psllw mm5,PASS1_BITS ; mm5=data0 psllw mm7,PASS1_BITS ; mm7=data4 movq MMWORD [MMBLOCK(0,0,edx,SIZEOF_DCTELEM)], mm5 movq MMWORD [MMBLOCK(0,1,edx,SIZEOF_DCTELEM)], mm7 ; (Original) ; z1 = (tmp12 + tmp13) * 0.541196100; ; data2 = z1 + tmp13 * 0.765366865; ; data6 = z1 + tmp12 * -1.847759065; ; ; (This implementation) ; data2 = tmp13 * (0.541196100 + 0.765366865) + tmp12 * 0.541196100; ; data6 = tmp13 * 0.541196100 + tmp12 * (0.541196100 - 1.847759065); movq mm4,mm1 ; mm1=tmp13 movq mm0,mm1 punpcklwd mm4,mm6 ; mm6=tmp12 punpckhwd mm0,mm6 movq mm1,mm4 movq mm6,mm0 pmaddwd mm4,[GOTOFF(ebx,PW_F130_F054)] ; mm4=data2L pmaddwd mm0,[GOTOFF(ebx,PW_F130_F054)] ; mm0=data2H pmaddwd mm1,[GOTOFF(ebx,PW_F054_MF130)] ; mm1=data6L pmaddwd mm6,[GOTOFF(ebx,PW_F054_MF130)] ; mm6=data6H paddd mm4,[GOTOFF(ebx,PD_DESCALE_P1)] paddd mm0,[GOTOFF(ebx,PD_DESCALE_P1)] psrad mm4,DESCALE_P1 psrad mm0,DESCALE_P1 paddd mm1,[GOTOFF(ebx,PD_DESCALE_P1)] paddd mm6,[GOTOFF(ebx,PD_DESCALE_P1)] psrad mm1,DESCALE_P1 psrad mm6,DESCALE_P1 packssdw mm4,mm0 ; mm4=data2 packssdw mm1,mm6 ; mm1=data6 movq MMWORD [MMBLOCK(2,0,edx,SIZEOF_DCTELEM)], mm4 movq MMWORD [MMBLOCK(2,1,edx,SIZEOF_DCTELEM)], mm1 ; -- Odd part movq mm5, MMWORD [wk(0)] ; mm5=tmp6 movq mm7, MMWORD [wk(1)] ; mm7=tmp7 movq mm0,mm2 ; mm2=tmp4 movq mm6,mm3 ; mm3=tmp5 paddw mm0,mm5 ; mm0=z3 paddw mm6,mm7 ; mm6=z4 ; (Original) ; z5 = (z3 + z4) * 1.175875602; ; z3 = z3 * -1.961570560; z4 = z4 * -0.390180644; ; z3 += z5; z4 += z5; ; ; (This implementation) ; z3 = z3 * (1.175875602 - 1.961570560) + z4 * 1.175875602; ; z4 = z3 * 1.175875602 + z4 * (1.175875602 - 0.390180644); movq mm4,mm0 movq mm1,mm0 punpcklwd mm4,mm6 punpckhwd mm1,mm6 movq mm0,mm4 movq mm6,mm1 pmaddwd mm4,[GOTOFF(ebx,PW_MF078_F117)] ; mm4=z3L pmaddwd mm1,[GOTOFF(ebx,PW_MF078_F117)] ; mm1=z3H pmaddwd mm0,[GOTOFF(ebx,PW_F117_F078)] ; mm0=z4L pmaddwd mm6,[GOTOFF(ebx,PW_F117_F078)] ; mm6=z4H movq MMWORD [wk(0)], mm4 ; wk(0)=z3L movq MMWORD [wk(1)], mm1 ; wk(1)=z3H ; (Original) ; z1 = tmp4 + tmp7; z2 = tmp5 + tmp6; ; tmp4 = tmp4 * 0.298631336; tmp5 = tmp5 * 2.053119869; ; tmp6 = tmp6 * 3.072711026; tmp7 = tmp7 * 1.501321110; ; z1 = z1 * -0.899976223; z2 = z2 * -2.562915447; ; data7 = tmp4 + z1 + z3; data5 = tmp5 + z2 + z4; ; data3 = tmp6 + z2 + z3; data1 = tmp7 + z1 + z4; ; ; (This implementation) ; tmp4 = tmp4 * (0.298631336 - 0.899976223) + tmp7 * -0.899976223; ; tmp5 = tmp5 * (2.053119869 - 2.562915447) + tmp6 * -2.562915447; ; tmp6 = tmp5 * -2.562915447 + tmp6 * (3.072711026 - 2.562915447); ; tmp7 = tmp4 * -0.899976223 + tmp7 * (1.501321110 - 0.899976223); ; data7 = tmp4 + z3; data5 = tmp5 + z4; ; data3 = tmp6 + z3; data1 = tmp7 + z4; movq mm4,mm2 movq mm1,mm2 punpcklwd mm4,mm7 punpckhwd mm1,mm7 movq mm2,mm4 movq mm7,mm1 pmaddwd mm4,[GOTOFF(ebx,PW_MF060_MF089)] ; mm4=tmp4L pmaddwd mm1,[GOTOFF(ebx,PW_MF060_MF089)] ; mm1=tmp4H pmaddwd mm2,[GOTOFF(ebx,PW_MF089_F060)] ; mm2=tmp7L pmaddwd mm7,[GOTOFF(ebx,PW_MF089_F060)] ; mm7=tmp7H paddd mm4, MMWORD [wk(0)] ; mm4=data7L paddd mm1, MMWORD [wk(1)] ; mm1=data7H paddd mm2,mm0 ; mm2=data1L paddd mm7,mm6 ; mm7=data1H paddd mm4,[GOTOFF(ebx,PD_DESCALE_P1)] paddd mm1,[GOTOFF(ebx,PD_DESCALE_P1)] psrad mm4,DESCALE_P1 psrad mm1,DESCALE_P1 paddd mm2,[GOTOFF(ebx,PD_DESCALE_P1)] paddd mm7,[GOTOFF(ebx,PD_DESCALE_P1)] psrad mm2,DESCALE_P1 psrad mm7,DESCALE_P1 packssdw mm4,mm1 ; mm4=data7 packssdw mm2,mm7 ; mm2=data1 movq MMWORD [MMBLOCK(3,1,edx,SIZEOF_DCTELEM)], mm4 movq MMWORD [MMBLOCK(1,0,edx,SIZEOF_DCTELEM)], mm2 movq mm1,mm3 movq mm7,mm3 punpcklwd mm1,mm5 punpckhwd mm7,mm5 movq mm3,mm1 movq mm5,mm7 pmaddwd mm1,[GOTOFF(ebx,PW_MF050_MF256)] ; mm1=tmp5L pmaddwd mm7,[GOTOFF(ebx,PW_MF050_MF256)] ; mm7=tmp5H pmaddwd mm3,[GOTOFF(ebx,PW_MF256_F050)] ; mm3=tmp6L pmaddwd mm5,[GOTOFF(ebx,PW_MF256_F050)] ; mm5=tmp6H paddd mm1,mm0 ; mm1=data5L paddd mm7,mm6 ; mm7=data5H paddd mm3, MMWORD [wk(0)] ; mm3=data3L paddd mm5, MMWORD [wk(1)] ; mm5=data3H paddd mm1,[GOTOFF(ebx,PD_DESCALE_P1)] paddd mm7,[GOTOFF(ebx,PD_DESCALE_P1)] psrad mm1,DESCALE_P1 psrad mm7,DESCALE_P1 paddd mm3,[GOTOFF(ebx,PD_DESCALE_P1)] paddd mm5,[GOTOFF(ebx,PD_DESCALE_P1)] psrad mm3,DESCALE_P1 psrad mm5,DESCALE_P1 packssdw mm1,mm7 ; mm1=data5 packssdw mm3,mm5 ; mm3=data3 movq MMWORD [MMBLOCK(1,1,edx,SIZEOF_DCTELEM)], mm1 movq MMWORD [MMBLOCK(3,0,edx,SIZEOF_DCTELEM)], mm3 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 paddw mm5,mm7 ; mm5=tmp10 paddw mm0,mm4 ; mm0=tmp11 psubw mm1,mm7 ; mm1=tmp13 psubw mm6,mm4 ; mm6=tmp12 movq mm7,mm5 paddw mm5,mm0 ; mm5=tmp10+tmp11 psubw mm7,mm0 ; mm7=tmp10-tmp11 paddw mm5,[GOTOFF(ebx,PW_DESCALE_P2X)] paddw mm7,[GOTOFF(ebx,PW_DESCALE_P2X)] psraw mm5,PASS1_BITS ; mm5=data0 psraw mm7,PASS1_BITS ; mm7=data4 movq MMWORD [MMBLOCK(0,0,edx,SIZEOF_DCTELEM)], mm5 movq MMWORD [MMBLOCK(4,0,edx,SIZEOF_DCTELEM)], mm7 ; (Original) ; z1 = (tmp12 + tmp13) * 0.541196100; ; data2 = z1 + tmp13 * 0.765366865; ; data6 = z1 + tmp12 * -1.847759065; ; ; (This implementation) ; data2 = tmp13 * (0.541196100 + 0.765366865) + tmp12 * 0.541196100; ; data6 = tmp13 * 0.541196100 + tmp12 * (0.541196100 - 1.847759065); movq mm4,mm1 ; mm1=tmp13 movq mm0,mm1 punpcklwd mm4,mm6 ; mm6=tmp12 punpckhwd mm0,mm6 movq mm1,mm4 movq mm6,mm0 pmaddwd mm4,[GOTOFF(ebx,PW_F130_F054)] ; mm4=data2L pmaddwd mm0,[GOTOFF(ebx,PW_F130_F054)] ; mm0=data2H pmaddwd mm1,[GOTOFF(ebx,PW_F054_MF130)] ; mm1=data6L pmaddwd mm6,[GOTOFF(ebx,PW_F054_MF130)] ; mm6=data6H paddd mm4,[GOTOFF(ebx,PD_DESCALE_P2)] paddd mm0,[GOTOFF(ebx,PD_DESCALE_P2)] psrad mm4,DESCALE_P2 psrad mm0,DESCALE_P2 paddd mm1,[GOTOFF(ebx,PD_DESCALE_P2)] paddd mm6,[GOTOFF(ebx,PD_DESCALE_P2)] psrad mm1,DESCALE_P2 psrad mm6,DESCALE_P2 packssdw mm4,mm0 ; mm4=data2 packssdw mm1,mm6 ; mm1=data6 movq MMWORD [MMBLOCK(2,0,edx,SIZEOF_DCTELEM)], mm4 movq MMWORD [MMBLOCK(6,0,edx,SIZEOF_DCTELEM)], mm1 ; -- Odd part movq mm5, MMWORD [wk(0)] ; mm5=tmp6 movq mm7, MMWORD [wk(1)] ; mm7=tmp7 movq mm0,mm2 ; mm2=tmp4 movq mm6,mm3 ; mm3=tmp5 paddw mm0,mm5 ; mm0=z3 paddw mm6,mm7 ; mm6=z4 ; (Original) ; z5 = (z3 + z4) * 1.175875602; ; z3 = z3 * -1.961570560; z4 = z4 * -0.390180644; ; z3 += z5; z4 += z5; ; ; (This implementation) ; z3 = z3 * (1.175875602 - 1.961570560) + z4 * 1.175875602; ; z4 = z3 * 1.175875602 + z4 * (1.175875602 - 0.390180644); movq mm4,mm0 movq mm1,mm0 punpcklwd mm4,mm6 punpckhwd mm1,mm6 movq mm0,mm4 movq mm6,mm1 pmaddwd mm4,[GOTOFF(ebx,PW_MF078_F117)] ; mm4=z3L pmaddwd mm1,[GOTOFF(ebx,PW_MF078_F117)] ; mm1=z3H pmaddwd mm0,[GOTOFF(ebx,PW_F117_F078)] ; mm0=z4L pmaddwd mm6,[GOTOFF(ebx,PW_F117_F078)] ; mm6=z4H movq MMWORD [wk(0)], mm4 ; wk(0)=z3L movq MMWORD [wk(1)], mm1 ; wk(1)=z3H ; (Original) ; z1 = tmp4 + tmp7; z2 = tmp5 + tmp6; ; tmp4 = tmp4 * 0.298631336; tmp5 = tmp5 * 2.053119869; ; tmp6 = tmp6 * 3.072711026; tmp7 = tmp7 * 1.501321110; ; z1 = z1 * -0.899976223; z2 = z2 * -2.562915447; ; data7 = tmp4 + z1 + z3; data5 = tmp5 + z2 + z4; ; data3 = tmp6 + z2 + z3; data1 = tmp7 + z1 + z4; ; ; (This implementation) ; tmp4 = tmp4 * (0.298631336 - 0.899976223) + tmp7 * -0.899976223; ; tmp5 = tmp5 * (2.053119869 - 2.562915447) + tmp6 * -2.562915447; ; tmp6 = tmp5 * -2.562915447 + tmp6 * (3.072711026 - 2.562915447); ; tmp7 = tmp4 * -0.899976223 + tmp7 * (1.501321110 - 0.899976223); ; data7 = tmp4 + z3; data5 = tmp5 + z4; ; data3 = tmp6 + z3; data1 = tmp7 + z4; movq mm4,mm2 movq mm1,mm2 punpcklwd mm4,mm7 punpckhwd mm1,mm7 movq mm2,mm4 movq mm7,mm1 pmaddwd mm4,[GOTOFF(ebx,PW_MF060_MF089)] ; mm4=tmp4L pmaddwd mm1,[GOTOFF(ebx,PW_MF060_MF089)] ; mm1=tmp4H pmaddwd mm2,[GOTOFF(ebx,PW_MF089_F060)] ; mm2=tmp7L pmaddwd mm7,[GOTOFF(ebx,PW_MF089_F060)] ; mm7=tmp7H paddd mm4, MMWORD [wk(0)] ; mm4=data7L paddd mm1, MMWORD [wk(1)] ; mm1=data7H paddd mm2,mm0 ; mm2=data1L paddd mm7,mm6 ; mm7=data1H paddd mm4,[GOTOFF(ebx,PD_DESCALE_P2)] paddd mm1,[GOTOFF(ebx,PD_DESCALE_P2)] psrad mm4,DESCALE_P2 psrad mm1,DESCALE_P2 paddd mm2,[GOTOFF(ebx,PD_DESCALE_P2)] paddd mm7,[GOTOFF(ebx,PD_DESCALE_P2)] psrad mm2,DESCALE_P2 psrad mm7,DESCALE_P2 packssdw mm4,mm1 ; mm4=data7 packssdw mm2,mm7 ; mm2=data1 movq MMWORD [MMBLOCK(7,0,edx,SIZEOF_DCTELEM)], mm4 movq MMWORD [MMBLOCK(1,0,edx,SIZEOF_DCTELEM)], mm2 movq mm1,mm3 movq mm7,mm3 punpcklwd mm1,mm5 punpckhwd mm7,mm5 movq mm3,mm1 movq mm5,mm7 pmaddwd mm1,[GOTOFF(ebx,PW_MF050_MF256)] ; mm1=tmp5L pmaddwd mm7,[GOTOFF(ebx,PW_MF050_MF256)] ; mm7=tmp5H pmaddwd mm3,[GOTOFF(ebx,PW_MF256_F050)] ; mm3=tmp6L pmaddwd mm5,[GOTOFF(ebx,PW_MF256_F050)] ; mm5=tmp6H paddd mm1,mm0 ; mm1=data5L paddd mm7,mm6 ; mm7=data5H paddd mm3, MMWORD [wk(0)] ; mm3=data3L paddd mm5, MMWORD [wk(1)] ; mm5=data3H paddd mm1,[GOTOFF(ebx,PD_DESCALE_P2)] paddd mm7,[GOTOFF(ebx,PD_DESCALE_P2)] psrad mm1,DESCALE_P2 psrad mm7,DESCALE_P2 paddd mm3,[GOTOFF(ebx,PD_DESCALE_P2)] paddd mm5,[GOTOFF(ebx,PD_DESCALE_P2)] psrad mm3,DESCALE_P2 psrad mm5,DESCALE_P2 packssdw mm1,mm7 ; mm1=data5 packssdw mm3,mm5 ; mm3=data3 movq MMWORD [MMBLOCK(5,0,edx,SIZEOF_DCTELEM)], mm1 movq MMWORD [MMBLOCK(3,0,edx,SIZEOF_DCTELEM)], mm3 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