kc3-lang/libjpeg-turbo/simd/i386/jidctred-sse2.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/jidctred-sse2.asm
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; ; Reduced-size IDCT (32-bit SSE2) ; ; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB ; Copyright (C) 2016, 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 inverse DCT routines that produce reduced-size output: ; either 4x4 or 2x2 pixels from an 8x8 DCT block. The following code is based ; directly on the IJG's original jidctred.c; see jidctred.c for more details. %include "jsimdext.inc" %include "jdct.inc" ; -------------------------------------------------------------------------- %define CONST_BITS 13 %define PASS1_BITS 2 %define DESCALE_P1_4 (CONST_BITS - PASS1_BITS + 1) %define DESCALE_P2_4 (CONST_BITS + PASS1_BITS + 3 + 1) %define DESCALE_P1_2 (CONST_BITS - PASS1_BITS + 2) %define DESCALE_P2_2 (CONST_BITS + PASS1_BITS + 3 + 2) %if CONST_BITS == 13 F_0_211 equ 1730 ; FIX(0.211164243) F_0_509 equ 4176 ; FIX(0.509795579) F_0_601 equ 4926 ; FIX(0.601344887) F_0_720 equ 5906 ; FIX(0.720959822) F_0_765 equ 6270 ; FIX(0.765366865) F_0_850 equ 6967 ; FIX(0.850430095) F_0_899 equ 7373 ; FIX(0.899976223) F_1_061 equ 8697 ; FIX(1.061594337) F_1_272 equ 10426 ; FIX(1.272758580) F_1_451 equ 11893 ; FIX(1.451774981) F_1_847 equ 15137 ; FIX(1.847759065) F_2_172 equ 17799 ; FIX(2.172734803) F_2_562 equ 20995 ; FIX(2.562915447) F_3_624 equ 29692 ; FIX(3.624509785) %else ; NASM cannot do compile-time arithmetic on floating-point constants. %define DESCALE(x, n) (((x) + (1 << ((n) - 1))) >> (n)) F_0_211 equ DESCALE( 226735879, 30 - CONST_BITS) ; FIX(0.211164243) F_0_509 equ DESCALE( 547388834, 30 - CONST_BITS) ; FIX(0.509795579) F_0_601 equ DESCALE( 645689155, 30 - CONST_BITS) ; FIX(0.601344887) F_0_720 equ DESCALE( 774124714, 30 - CONST_BITS) ; FIX(0.720959822) F_0_765 equ DESCALE( 821806413, 30 - CONST_BITS) ; FIX(0.765366865) F_0_850 equ DESCALE( 913142361, 30 - CONST_BITS) ; FIX(0.850430095) F_0_899 equ DESCALE( 966342111, 30 - CONST_BITS) ; FIX(0.899976223) F_1_061 equ DESCALE(1139878239, 30 - CONST_BITS) ; FIX(1.061594337) F_1_272 equ DESCALE(1366614119, 30 - CONST_BITS) ; FIX(1.272758580) F_1_451 equ DESCALE(1558831516, 30 - CONST_BITS) ; FIX(1.451774981) F_1_847 equ DESCALE(1984016188, 30 - CONST_BITS) ; FIX(1.847759065) F_2_172 equ DESCALE(2332956230, 30 - CONST_BITS) ; FIX(2.172734803) F_2_562 equ DESCALE(2751909506, 30 - CONST_BITS) ; FIX(2.562915447) F_3_624 equ DESCALE(3891787747, 30 - CONST_BITS) ; FIX(3.624509785) %endif ; -------------------------------------------------------------------------- SECTION SEG_CONST ALIGNZ 32 GLOBAL_DATA(jconst_idct_red_sse2) EXTN(jconst_idct_red_sse2): PW_F184_MF076 times 4 dw F_1_847, -F_0_765 PW_F256_F089 times 4 dw F_2_562, F_0_899 PW_F106_MF217 times 4 dw F_1_061, -F_2_172 PW_MF060_MF050 times 4 dw -F_0_601, -F_0_509 PW_F145_MF021 times 4 dw F_1_451, -F_0_211 PW_F362_MF127 times 4 dw F_3_624, -F_1_272 PW_F085_MF072 times 4 dw F_0_850, -F_0_720 PD_DESCALE_P1_4 times 4 dd 1 << (DESCALE_P1_4 - 1) PD_DESCALE_P2_4 times 4 dd 1 << (DESCALE_P2_4 - 1) PD_DESCALE_P1_2 times 4 dd 1 << (DESCALE_P1_2 - 1) PD_DESCALE_P2_2 times 4 dd 1 << (DESCALE_P2_2 - 1) PB_CENTERJSAMP times 16 db CENTERJSAMPLE ALIGNZ 32 ; -------------------------------------------------------------------------- SECTION SEG_TEXT BITS 32 ; Perform dequantization and inverse DCT on one block of coefficients, ; producing a reduced-size 4x4 output block. ; ; GLOBAL(void) ; jsimd_idct_4x4_sse2(void *dct_table, JCOEFPTR coef_block, ; JSAMPARRAY output_buf, JDIMENSION output_col) %define dct_table(b) (b) + 8 ; void *dct_table %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_XMMWORD ; xmmword wk[WK_NUM] %define WK_NUM 2 align 32 GLOBAL_FUNCTION(jsimd_idct_4x4_sse2) EXTN(jsimd_idct_4x4_sse2): push ebp mov eax, esp ; eax = original ebp sub esp, byte 4 and esp, byte (-SIZEOF_XMMWORD) ; align to 128 bits mov [esp], eax mov ebp, esp ; ebp = aligned ebp lea esp, [wk(0)] PUSHPIC ebx ; push ecx ; unused ; push edx ; need not be preserved push esi push edi GET_GOT ebx ; get GOT address ; ---- Pass 1: process columns from input. ; mov eax, [original_ebp] mov edx, POINTER [dct_table(eax)] ; quantptr mov esi, JCOEFPTR [coef_block(eax)] ; inptr %ifndef NO_ZERO_COLUMN_TEST_4X4_SSE2 mov eax, dword [DWBLOCK(1, 0, esi, SIZEOF_JCOEF)] or eax, dword [DWBLOCK(2, 0, esi, SIZEOF_JCOEF)] jnz short .columnDCT movdqa xmm0, XMMWORD [XMMBLOCK(1, 0, esi, SIZEOF_JCOEF)] movdqa xmm1, XMMWORD [XMMBLOCK(2, 0, esi, SIZEOF_JCOEF)] por xmm0, XMMWORD [XMMBLOCK(3, 0, esi, SIZEOF_JCOEF)] por xmm1, XMMWORD [XMMBLOCK(5, 0, esi, SIZEOF_JCOEF)] por xmm0, XMMWORD [XMMBLOCK(6, 0, esi, SIZEOF_JCOEF)] por xmm1, XMMWORD [XMMBLOCK(7, 0, esi, SIZEOF_JCOEF)] por xmm0, xmm1 packsswb xmm0, xmm0 packsswb xmm0, xmm0 movd eax, xmm0 test eax, eax jnz short .columnDCT ; -- AC terms all zero movdqa xmm0, XMMWORD [XMMBLOCK(0, 0, esi, SIZEOF_JCOEF)] pmullw xmm0, XMMWORD [XMMBLOCK(0, 0, edx, SIZEOF_ISLOW_MULT_TYPE)] psllw xmm0, PASS1_BITS movdqa xmm3, xmm0 ; xmm0 = in0 = (00 01 02 03 04 05 06 07) punpcklwd xmm0, xmm0 ; xmm0 = (00 00 01 01 02 02 03 03) punpckhwd xmm3, xmm3 ; xmm3 = (04 04 05 05 06 06 07 07) pshufd xmm1, xmm0, 0x50 ; xmm1 = [col0 col1] = (00 00 00 00 01 01 01 01) pshufd xmm0, xmm0, 0xFA ; xmm0 = [col2 col3] = (02 02 02 02 03 03 03 03) pshufd xmm6, xmm3, 0x50 ; xmm6 = [col4 col5] = (04 04 04 04 05 05 05 05) pshufd xmm3, xmm3, 0xFA ; xmm3 = [col6 col7] = (06 06 06 06 07 07 07 07) jmp near .column_end ALIGNX 16, 7 %endif .columnDCT: ; -- Odd part movdqa xmm0, XMMWORD [XMMBLOCK(1, 0, esi, SIZEOF_JCOEF)] movdqa xmm1, XMMWORD [XMMBLOCK(3, 0, esi, SIZEOF_JCOEF)] pmullw xmm0, XMMWORD [XMMBLOCK(1, 0, edx, SIZEOF_ISLOW_MULT_TYPE)] pmullw xmm1, XMMWORD [XMMBLOCK(3, 0, edx, SIZEOF_ISLOW_MULT_TYPE)] movdqa xmm2, XMMWORD [XMMBLOCK(5, 0, esi, SIZEOF_JCOEF)] movdqa xmm3, XMMWORD [XMMBLOCK(7, 0, esi, SIZEOF_JCOEF)] pmullw xmm2, XMMWORD [XMMBLOCK(5, 0, edx, SIZEOF_ISLOW_MULT_TYPE)] pmullw xmm3, XMMWORD [XMMBLOCK(7, 0, edx, SIZEOF_ISLOW_MULT_TYPE)] movdqa xmm4, xmm0 movdqa xmm5, xmm0 punpcklwd xmm4, xmm1 punpckhwd xmm5, xmm1 movdqa xmm0, xmm4 movdqa xmm1, xmm5 pmaddwd xmm4, [GOTOFF(ebx, PW_F256_F089)] ; xmm4 = (tmp2L) pmaddwd xmm5, [GOTOFF(ebx, PW_F256_F089)] ; xmm5 = (tmp2H) pmaddwd xmm0, [GOTOFF(ebx, PW_F106_MF217)] ; xmm0 = (tmp0L) pmaddwd xmm1, [GOTOFF(ebx, PW_F106_MF217)] ; xmm1 = (tmp0H) movdqa xmm6, xmm2 movdqa xmm7, xmm2 punpcklwd xmm6, xmm3 punpckhwd xmm7, xmm3 movdqa xmm2, xmm6 movdqa xmm3, xmm7 pmaddwd xmm6, [GOTOFF(ebx, PW_MF060_MF050)] ; xmm6 = (tmp2L) pmaddwd xmm7, [GOTOFF(ebx, PW_MF060_MF050)] ; xmm7 = (tmp2H) pmaddwd xmm2, [GOTOFF(ebx, PW_F145_MF021)] ; xmm2 = (tmp0L) pmaddwd xmm3, [GOTOFF(ebx, PW_F145_MF021)] ; xmm3 = (tmp0H) paddd xmm6, xmm4 ; xmm6 = tmp2L paddd xmm7, xmm5 ; xmm7 = tmp2H paddd xmm2, xmm0 ; xmm2 = tmp0L paddd xmm3, xmm1 ; xmm3 = tmp0H movdqa XMMWORD [wk(0)], xmm2 ; wk(0) = tmp0L movdqa XMMWORD [wk(1)], xmm3 ; wk(1) = tmp0H ; -- Even part movdqa xmm4, XMMWORD [XMMBLOCK(0, 0, esi, SIZEOF_JCOEF)] movdqa xmm5, XMMWORD [XMMBLOCK(2, 0, esi, SIZEOF_JCOEF)] movdqa xmm0, XMMWORD [XMMBLOCK(6, 0, esi, SIZEOF_JCOEF)] pmullw xmm4, XMMWORD [XMMBLOCK(0, 0, edx, SIZEOF_ISLOW_MULT_TYPE)] pmullw xmm5, XMMWORD [XMMBLOCK(2, 0, edx, SIZEOF_ISLOW_MULT_TYPE)] pmullw xmm0, XMMWORD [XMMBLOCK(6, 0, edx, SIZEOF_ISLOW_MULT_TYPE)] pxor xmm1, xmm1 pxor xmm2, xmm2 punpcklwd xmm1, xmm4 ; xmm1 = tmp0L punpckhwd xmm2, xmm4 ; xmm2 = tmp0H psrad xmm1, (16 - CONST_BITS - 1) ; psrad xmm1, 16 & pslld xmm1, CONST_BITS + 1 psrad xmm2, (16 - CONST_BITS - 1) ; psrad xmm2, 16 & pslld xmm2, CONST_BITS + 1 movdqa xmm3, xmm5 ; xmm5 = in2 = z2 punpcklwd xmm5, xmm0 ; xmm0 = in6 = z3 punpckhwd xmm3, xmm0 pmaddwd xmm5, [GOTOFF(ebx, PW_F184_MF076)] ; xmm5 = tmp2L pmaddwd xmm3, [GOTOFF(ebx, PW_F184_MF076)] ; xmm3 = tmp2H movdqa xmm4, xmm1 movdqa xmm0, xmm2 paddd xmm1, xmm5 ; xmm1 = tmp10L paddd xmm2, xmm3 ; xmm2 = tmp10H psubd xmm4, xmm5 ; xmm4 = tmp12L psubd xmm0, xmm3 ; xmm0 = tmp12H ; -- Final output stage movdqa xmm5, xmm1 movdqa xmm3, xmm2 paddd xmm1, xmm6 ; xmm1 = data0L paddd xmm2, xmm7 ; xmm2 = data0H psubd xmm5, xmm6 ; xmm5 = data3L psubd xmm3, xmm7 ; xmm3 = data3H movdqa xmm6, [GOTOFF(ebx, PD_DESCALE_P1_4)] ; xmm6 = [PD_DESCALE_P1_4] paddd xmm1, xmm6 paddd xmm2, xmm6 psrad xmm1, DESCALE_P1_4 psrad xmm2, DESCALE_P1_4 paddd xmm5, xmm6 paddd xmm3, xmm6 psrad xmm5, DESCALE_P1_4 psrad xmm3, DESCALE_P1_4 packssdw xmm1, xmm2 ; xmm1 = data0 = (00 01 02 03 04 05 06 07) packssdw xmm5, xmm3 ; xmm5 = data3 = (30 31 32 33 34 35 36 37) movdqa xmm7, XMMWORD [wk(0)] ; xmm7 = tmp0L movdqa xmm6, XMMWORD [wk(1)] ; xmm6 = tmp0H movdqa xmm2, xmm4 movdqa xmm3, xmm0 paddd xmm4, xmm7 ; xmm4 = data1L paddd xmm0, xmm6 ; xmm0 = data1H psubd xmm2, xmm7 ; xmm2 = data2L psubd xmm3, xmm6 ; xmm3 = data2H movdqa xmm7, [GOTOFF(ebx, PD_DESCALE_P1_4)] ; xmm7 = [PD_DESCALE_P1_4] paddd xmm4, xmm7 paddd xmm0, xmm7 psrad xmm4, DESCALE_P1_4 psrad xmm0, DESCALE_P1_4 paddd xmm2, xmm7 paddd xmm3, xmm7 psrad xmm2, DESCALE_P1_4 psrad xmm3, DESCALE_P1_4 packssdw xmm4, xmm0 ; xmm4 = data1 = (10 11 12 13 14 15 16 17) packssdw xmm2, xmm3 ; xmm2 = data2 = (20 21 22 23 24 25 26 27) movdqa xmm6, xmm1 ; transpose coefficients(phase 1) punpcklwd xmm1, xmm4 ; xmm1 = (00 10 01 11 02 12 03 13) punpckhwd xmm6, xmm4 ; xmm6 = (04 14 05 15 06 16 07 17) movdqa xmm7, xmm2 ; transpose coefficients(phase 1) punpcklwd xmm2, xmm5 ; xmm2 = (20 30 21 31 22 32 23 33) punpckhwd xmm7, xmm5 ; xmm7 = (24 34 25 35 26 36 27 37) movdqa xmm0, xmm1 ; transpose coefficients(phase 2) punpckldq xmm1, xmm2 ; xmm1 = [col0 col1] = (00 10 20 30 01 11 21 31) punpckhdq xmm0, xmm2 ; xmm0 = [col2 col3] = (02 12 22 32 03 13 23 33) movdqa xmm3, xmm6 ; transpose coefficients(phase 2) punpckldq xmm6, xmm7 ; xmm6 = [col4 col5] = (04 14 24 34 05 15 25 35) punpckhdq xmm3, xmm7 ; xmm3 = [col6 col7] = (06 16 26 36 07 17 27 37) .column_end: ; -- Prefetch the next coefficient block prefetchnta [esi + DCTSIZE2 * SIZEOF_JCOEF + 0 * 32] prefetchnta [esi + DCTSIZE2 * SIZEOF_JCOEF + 1 * 32] prefetchnta [esi + DCTSIZE2 * SIZEOF_JCOEF + 2 * 32] prefetchnta [esi + DCTSIZE2 * SIZEOF_JCOEF + 3 * 32] ; ---- Pass 2: process rows, store into output array. mov eax, [original_ebp] mov edi, JSAMPARRAY [output_buf(eax)] ; (JSAMPROW *) mov eax, JDIMENSION [output_col(eax)] ; -- Even part pxor xmm4, xmm4 punpcklwd xmm4, xmm1 ; xmm4 = tmp0 psrad xmm4, (16 - CONST_BITS - 1) ; psrad xmm4, 16 & pslld xmm4, CONST_BITS + 1 ; -- Odd part punpckhwd xmm1, xmm0 punpckhwd xmm6, xmm3 movdqa xmm5, xmm1 movdqa xmm2, xmm6 pmaddwd xmm1, [GOTOFF(ebx, PW_F256_F089)] ; xmm1 = (tmp2) pmaddwd xmm6, [GOTOFF(ebx, PW_MF060_MF050)] ; xmm6 = (tmp2) pmaddwd xmm5, [GOTOFF(ebx, PW_F106_MF217)] ; xmm5 = (tmp0) pmaddwd xmm2, [GOTOFF(ebx, PW_F145_MF021)] ; xmm2 = (tmp0) paddd xmm6, xmm1 ; xmm6 = tmp2 paddd xmm2, xmm5 ; xmm2 = tmp0 ; -- Even part punpcklwd xmm0, xmm3 pmaddwd xmm0, [GOTOFF(ebx, PW_F184_MF076)] ; xmm0 = tmp2 movdqa xmm7, xmm4 paddd xmm4, xmm0 ; xmm4 = tmp10 psubd xmm7, xmm0 ; xmm7 = tmp12 ; -- Final output stage movdqa xmm1, [GOTOFF(ebx, PD_DESCALE_P2_4)] ; xmm1 = [PD_DESCALE_P2_4] movdqa xmm5, xmm4 movdqa xmm3, xmm7 paddd xmm4, xmm6 ; xmm4 = data0 = (00 10 20 30) paddd xmm7, xmm2 ; xmm7 = data1 = (01 11 21 31) psubd xmm5, xmm6 ; xmm5 = data3 = (03 13 23 33) psubd xmm3, xmm2 ; xmm3 = data2 = (02 12 22 32) paddd xmm4, xmm1 paddd xmm7, xmm1 psrad xmm4, DESCALE_P2_4 psrad xmm7, DESCALE_P2_4 paddd xmm5, xmm1 paddd xmm3, xmm1 psrad xmm5, DESCALE_P2_4 psrad xmm3, DESCALE_P2_4 packssdw xmm4, xmm3 ; xmm4 = (00 10 20 30 02 12 22 32) packssdw xmm7, xmm5 ; xmm7 = (01 11 21 31 03 13 23 33) movdqa xmm0, xmm4 ; transpose coefficients(phase 1) punpcklwd xmm4, xmm7 ; xmm4 = (00 01 10 11 20 21 30 31) punpckhwd xmm0, xmm7 ; xmm0 = (02 03 12 13 22 23 32 33) movdqa xmm6, xmm4 ; transpose coefficients(phase 2) punpckldq xmm4, xmm0 ; xmm4 = (00 01 02 03 10 11 12 13) punpckhdq xmm6, xmm0 ; xmm6 = (20 21 22 23 30 31 32 33) packsswb xmm4, xmm6 ; xmm4 = (00 01 02 03 10 11 12 13 20 ..) paddb xmm4, [GOTOFF(ebx, PB_CENTERJSAMP)] pshufd xmm2, xmm4, 0x39 ; xmm2 = (10 11 12 13 20 21 22 23 30 ..) pshufd xmm1, xmm4, 0x4E ; xmm1 = (20 21 22 23 30 31 32 33 00 ..) pshufd xmm3, xmm4, 0x93 ; xmm3 = (30 31 32 33 00 01 02 03 10 ..) mov edx, JSAMPROW [edi + 0 * SIZEOF_JSAMPROW] mov esi, JSAMPROW [edi + 1 * SIZEOF_JSAMPROW] movd XMM_DWORD [edx + eax * SIZEOF_JSAMPLE], xmm4 movd XMM_DWORD [esi + eax * SIZEOF_JSAMPLE], xmm2 mov edx, JSAMPROW [edi + 2 * SIZEOF_JSAMPROW] mov esi, JSAMPROW [edi + 3 * SIZEOF_JSAMPROW] movd XMM_DWORD [edx + eax * SIZEOF_JSAMPLE], xmm1 movd XMM_DWORD [esi + eax * SIZEOF_JSAMPLE], xmm3 pop edi pop esi ; pop edx ; need not be preserved ; pop ecx ; unused POPPIC ebx mov esp, ebp ; esp <- aligned ebp pop esp ; esp <- original ebp pop ebp ret ; -------------------------------------------------------------------------- ; ; Perform dequantization and inverse DCT on one block of coefficients, ; producing a reduced-size 2x2 output block. ; ; GLOBAL(void) ; jsimd_idct_2x2_sse2(void *dct_table, JCOEFPTR coef_block, ; JSAMPARRAY output_buf, JDIMENSION output_col) %define dct_table(b) (b) + 8 ; void *dct_table %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 align 32 GLOBAL_FUNCTION(jsimd_idct_2x2_sse2) EXTN(jsimd_idct_2x2_sse2): push ebp mov ebp, esp 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. mov edx, POINTER [dct_table(ebp)] ; quantptr mov esi, JCOEFPTR [coef_block(ebp)] ; inptr ; | input: | result: | ; | 00 01 ** 03 ** 05 ** 07 | | ; | 10 11 ** 13 ** 15 ** 17 | | ; | ** ** ** ** ** ** ** ** | | ; | 30 31 ** 33 ** 35 ** 37 | A0 A1 A3 A5 A7 | ; | ** ** ** ** ** ** ** ** | B0 B1 B3 B5 B7 | ; | 50 51 ** 53 ** 55 ** 57 | | ; | ** ** ** ** ** ** ** ** | | ; | 70 71 ** 73 ** 75 ** 77 | | ; -- Odd part movdqa xmm0, XMMWORD [XMMBLOCK(1, 0, esi, SIZEOF_JCOEF)] movdqa xmm1, XMMWORD [XMMBLOCK(3, 0, esi, SIZEOF_JCOEF)] pmullw xmm0, XMMWORD [XMMBLOCK(1, 0, edx, SIZEOF_ISLOW_MULT_TYPE)] pmullw xmm1, XMMWORD [XMMBLOCK(3, 0, edx, SIZEOF_ISLOW_MULT_TYPE)] movdqa xmm2, XMMWORD [XMMBLOCK(5, 0, esi, SIZEOF_JCOEF)] movdqa xmm3, XMMWORD [XMMBLOCK(7, 0, esi, SIZEOF_JCOEF)] pmullw xmm2, XMMWORD [XMMBLOCK(5, 0, edx, SIZEOF_ISLOW_MULT_TYPE)] pmullw xmm3, XMMWORD [XMMBLOCK(7, 0, edx, SIZEOF_ISLOW_MULT_TYPE)] ; xmm0 = (10 11 ** 13 ** 15 ** 17) ; xmm1 = (30 31 ** 33 ** 35 ** 37) ; xmm2 = (50 51 ** 53 ** 55 ** 57) ; xmm3 = (70 71 ** 73 ** 75 ** 77) pcmpeqd xmm7, xmm7 pslld xmm7, WORD_BIT ; xmm7 = { 0x0000 0xFFFF 0x0000 0xFFFF .. } movdqa xmm4, xmm0 ; xmm4 = (10 11 ** 13 ** 15 ** 17) movdqa xmm5, xmm2 ; xmm5 = (50 51 ** 53 ** 55 ** 57) punpcklwd xmm4, xmm1 ; xmm4 = (10 30 11 31 ** ** 13 33) punpcklwd xmm5, xmm3 ; xmm5 = (50 70 51 71 ** ** 53 73) pmaddwd xmm4, [GOTOFF(ebx, PW_F362_MF127)] pmaddwd xmm5, [GOTOFF(ebx, PW_F085_MF072)] psrld xmm0, WORD_BIT ; xmm0 = (11 -- 13 -- 15 -- 17 --) pand xmm1, xmm7 ; xmm1 = (-- 31 -- 33 -- 35 -- 37) psrld xmm2, WORD_BIT ; xmm2 = (51 -- 53 -- 55 -- 57 --) pand xmm3, xmm7 ; xmm3 = (-- 71 -- 73 -- 75 -- 77) por xmm0, xmm1 ; xmm0 = (11 31 13 33 15 35 17 37) por xmm2, xmm3 ; xmm2 = (51 71 53 73 55 75 57 77) pmaddwd xmm0, [GOTOFF(ebx, PW_F362_MF127)] pmaddwd xmm2, [GOTOFF(ebx, PW_F085_MF072)] paddd xmm4, xmm5 ; xmm4 = tmp0[col0 col1 **** col3] paddd xmm0, xmm2 ; xmm0 = tmp0[col1 col3 col5 col7] ; -- Even part movdqa xmm6, XMMWORD [XMMBLOCK(0, 0, esi, SIZEOF_JCOEF)] pmullw xmm6, XMMWORD [XMMBLOCK(0, 0, edx, SIZEOF_ISLOW_MULT_TYPE)] ; xmm6 = (00 01 ** 03 ** 05 ** 07) movdqa xmm1, xmm6 ; xmm1 = (00 01 ** 03 ** 05 ** 07) pslld xmm6, WORD_BIT ; xmm6 = (-- 00 -- ** -- ** -- **) pand xmm1, xmm7 ; xmm1 = (-- 01 -- 03 -- 05 -- 07) psrad xmm6, (WORD_BIT - CONST_BITS - 2) ; xmm6 = tmp10[col0 **** **** ****] psrad xmm1, (WORD_BIT - CONST_BITS - 2) ; xmm1 = tmp10[col1 col3 col5 col7] ; -- Final output stage movdqa xmm3, xmm6 movdqa xmm5, xmm1 paddd xmm6, xmm4 ; xmm6 = data0[col0 **** **** ****] = (A0 ** ** **) paddd xmm1, xmm0 ; xmm1 = data0[col1 col3 col5 col7] = (A1 A3 A5 A7) psubd xmm3, xmm4 ; xmm3 = data1[col0 **** **** ****] = (B0 ** ** **) psubd xmm5, xmm0 ; xmm5 = data1[col1 col3 col5 col7] = (B1 B3 B5 B7) movdqa xmm2, [GOTOFF(ebx, PD_DESCALE_P1_2)] ; xmm2 = [PD_DESCALE_P1_2] punpckldq xmm6, xmm3 ; xmm6 = (A0 B0 ** **) movdqa xmm7, xmm1 punpcklqdq xmm1, xmm5 ; xmm1 = (A1 A3 B1 B3) punpckhqdq xmm7, xmm5 ; xmm7 = (A5 A7 B5 B7) paddd xmm6, xmm2 psrad xmm6, DESCALE_P1_2 paddd xmm1, xmm2 paddd xmm7, xmm2 psrad xmm1, DESCALE_P1_2 psrad xmm7, DESCALE_P1_2 ; -- Prefetch the next coefficient block prefetchnta [esi + DCTSIZE2 * SIZEOF_JCOEF + 0 * 32] prefetchnta [esi + DCTSIZE2 * SIZEOF_JCOEF + 1 * 32] prefetchnta [esi + DCTSIZE2 * SIZEOF_JCOEF + 2 * 32] prefetchnta [esi + DCTSIZE2 * SIZEOF_JCOEF + 3 * 32] ; ---- Pass 2: process rows, store into output array. mov edi, JSAMPARRAY [output_buf(ebp)] ; (JSAMPROW *) mov eax, JDIMENSION [output_col(ebp)] ; | input:| result:| ; | A0 B0 | | ; | A1 B1 | C0 C1 | ; | A3 B3 | D0 D1 | ; | A5 B5 | | ; | A7 B7 | | ; -- Odd part packssdw xmm1, xmm1 ; xmm1 = (A1 A3 B1 B3 A1 A3 B1 B3) packssdw xmm7, xmm7 ; xmm7 = (A5 A7 B5 B7 A5 A7 B5 B7) pmaddwd xmm1, [GOTOFF(ebx, PW_F362_MF127)] pmaddwd xmm7, [GOTOFF(ebx, PW_F085_MF072)] paddd xmm1, xmm7 ; xmm1 = tmp0[row0 row1 row0 row1] ; -- Even part pslld xmm6, (CONST_BITS + 2) ; xmm6 = tmp10[row0 row1 **** ****] ; -- Final output stage movdqa xmm4, xmm6 paddd xmm6, xmm1 ; xmm6 = data0[row0 row1 **** ****] = (C0 C1 ** **) psubd xmm4, xmm1 ; xmm4 = data1[row0 row1 **** ****] = (D0 D1 ** **) punpckldq xmm6, xmm4 ; xmm6 = (C0 D0 C1 D1) paddd xmm6, [GOTOFF(ebx, PD_DESCALE_P2_2)] psrad xmm6, DESCALE_P2_2 packssdw xmm6, xmm6 ; xmm6 = (C0 D0 C1 D1 C0 D0 C1 D1) packsswb xmm6, xmm6 ; xmm6 = (C0 D0 C1 D1 C0 D0 C1 D1 ..) paddb xmm6, [GOTOFF(ebx, PB_CENTERJSAMP)] pextrw ebx, xmm6, 0x00 ; ebx = (C0 D0 -- --) pextrw ecx, xmm6, 0x01 ; ecx = (C1 D1 -- --) mov edx, JSAMPROW [edi + 0 * SIZEOF_JSAMPROW] mov esi, JSAMPROW [edi + 1 * SIZEOF_JSAMPROW] mov word [edx + eax * SIZEOF_JSAMPLE], bx mov word [esi + eax * SIZEOF_JSAMPLE], cx pop edi pop esi ; pop edx ; need not be preserved ; pop ecx ; need not be preserved pop ebx 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