kc3-lang/libjpeg-turbo/simd/i386/jfdctint-mmx.asm
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Hash : 5e27ca23
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Date : 2025-09-19T14:21:49
x86: Reformat NASM code to improve readability (and simplify the checkstyle script)
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simd/i386/jfdctint-mmx.asm
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; ; Accurate integer FDCT (32-bit MMX) ; ; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB ; Copyright (C) 2016, 2020, 2024-2025, D. R. Commander. ; ; 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) or Yasm. ; ; This file contains a slower but more accurate integer implementation of the ; forward DCT (Discrete Cosine Transform). The following code is based ; directly on the IJG's original jfdctint.c; see jfdctint.c for more details. %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 32 GLOBAL_DATA(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 32 ; -------------------------------------------------------------------------- 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 32 GLOBAL_FUNCTION(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 32