kc3-lang/libjpeg-turbo/simd/i386/jidctred-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/jidctred-mmx.asm
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; ; Reduced-size IDCT (32-bit MMX) ; ; 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_mmx) EXTN(jconst_idct_red_mmx): PW_F184_MF076 times 2 dw F_1_847, -F_0_765 PW_F256_F089 times 2 dw F_2_562, F_0_899 PW_F106_MF217 times 2 dw F_1_061, -F_2_172 PW_MF060_MF050 times 2 dw -F_0_601, -F_0_509 PW_F145_MF021 times 2 dw F_1_451, -F_0_211 PW_F362_MF127 times 2 dw F_3_624, -F_1_272 PW_F085_MF072 times 2 dw F_0_850, -F_0_720 PD_DESCALE_P1_4 times 2 dd 1 << (DESCALE_P1_4 - 1) PD_DESCALE_P2_4 times 2 dd 1 << (DESCALE_P2_4 - 1) PD_DESCALE_P1_2 times 2 dd 1 << (DESCALE_P1_2 - 1) PD_DESCALE_P2_2 times 2 dd 1 << (DESCALE_P2_2 - 1) PB_CENTERJSAMP times 8 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_mmx(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_MMWORD ; mmword wk[WK_NUM] %define WK_NUM 2 %define workspace wk(0) - DCTSIZE2 * SIZEOF_JCOEF ; JCOEF workspace[DCTSIZE2] align 32 GLOBAL_FUNCTION(jsimd_idct_4x4_mmx) EXTN(jsimd_idct_4x4_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] PUSHPIC 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_4X4_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(5, 0, esi, SIZEOF_JCOEF)] por mm0, MMWORD [MMBLOCK(6, 0, esi, SIZEOF_JCOEF)] por mm1, MMWORD [MMBLOCK(7, 0, esi, SIZEOF_JCOEF)] por mm0, mm1 packsswb mm0, mm0 movd eax, mm0 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_ISLOW_MULT_TYPE)] psllw mm0, PASS1_BITS 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(1, 0, edi, SIZEOF_JCOEF)], mm1 movq MMWORD [MMBLOCK(2, 0, edi, SIZEOF_JCOEF)], mm2 movq MMWORD [MMBLOCK(3, 0, edi, SIZEOF_JCOEF)], mm3 jmp near .nextcolumn ALIGNX 16, 7 %endif .columnDCT: ; -- Odd part movq mm0, MMWORD [MMBLOCK(1, 0, esi, SIZEOF_JCOEF)] movq mm1, MMWORD [MMBLOCK(3, 0, esi, SIZEOF_JCOEF)] pmullw mm0, MMWORD [MMBLOCK(1, 0, edx, SIZEOF_ISLOW_MULT_TYPE)] pmullw mm1, MMWORD [MMBLOCK(3, 0, edx, SIZEOF_ISLOW_MULT_TYPE)] movq mm2, MMWORD [MMBLOCK(5, 0, esi, SIZEOF_JCOEF)] movq mm3, MMWORD [MMBLOCK(7, 0, esi, SIZEOF_JCOEF)] pmullw mm2, MMWORD [MMBLOCK(5, 0, edx, SIZEOF_ISLOW_MULT_TYPE)] pmullw mm3, MMWORD [MMBLOCK(7, 0, edx, SIZEOF_ISLOW_MULT_TYPE)] movq mm4, mm0 movq mm5, mm0 punpcklwd mm4, mm1 punpckhwd mm5, mm1 movq mm0, mm4 movq mm1, mm5 pmaddwd mm4, [GOTOFF(ebx, PW_F256_F089)] ; mm4 = (tmp2L) pmaddwd mm5, [GOTOFF(ebx, PW_F256_F089)] ; mm5 = (tmp2H) pmaddwd mm0, [GOTOFF(ebx, PW_F106_MF217)] ; mm0 = (tmp0L) pmaddwd mm1, [GOTOFF(ebx, PW_F106_MF217)] ; mm1 = (tmp0H) movq mm6, mm2 movq mm7, mm2 punpcklwd mm6, mm3 punpckhwd mm7, mm3 movq mm2, mm6 movq mm3, mm7 pmaddwd mm6, [GOTOFF(ebx, PW_MF060_MF050)] ; mm6 = (tmp2L) pmaddwd mm7, [GOTOFF(ebx, PW_MF060_MF050)] ; mm7 = (tmp2H) pmaddwd mm2, [GOTOFF(ebx, PW_F145_MF021)] ; mm2 = (tmp0L) pmaddwd mm3, [GOTOFF(ebx, PW_F145_MF021)] ; mm3 = (tmp0H) paddd mm6, mm4 ; mm6 = tmp2L paddd mm7, mm5 ; mm7 = tmp2H paddd mm2, mm0 ; mm2 = tmp0L paddd mm3, mm1 ; mm3 = tmp0H movq MMWORD [wk(0)], mm2 ; wk(0) = tmp0L movq MMWORD [wk(1)], mm3 ; wk(1) = tmp0H ; -- Even part movq mm4, MMWORD [MMBLOCK(0, 0, esi, SIZEOF_JCOEF)] movq mm5, MMWORD [MMBLOCK(2, 0, esi, SIZEOF_JCOEF)] movq mm0, MMWORD [MMBLOCK(6, 0, esi, SIZEOF_JCOEF)] pmullw mm4, MMWORD [MMBLOCK(0, 0, edx, SIZEOF_ISLOW_MULT_TYPE)] pmullw mm5, MMWORD [MMBLOCK(2, 0, edx, SIZEOF_ISLOW_MULT_TYPE)] pmullw mm0, MMWORD [MMBLOCK(6, 0, edx, SIZEOF_ISLOW_MULT_TYPE)] pxor mm1, mm1 pxor mm2, mm2 punpcklwd mm1, mm4 ; mm1 = tmp0L punpckhwd mm2, mm4 ; mm2 = tmp0H psrad mm1, (16 - CONST_BITS - 1) ; psrad mm1, 16 & pslld mm1, CONST_BITS + 1 psrad mm2, (16 - CONST_BITS - 1) ; psrad mm2, 16 & pslld mm2, CONST_BITS + 1 movq mm3, mm5 ; mm5 = in2 = z2 punpcklwd mm5, mm0 ; mm0 = in6 = z3 punpckhwd mm3, mm0 pmaddwd mm5, [GOTOFF(ebx, PW_F184_MF076)] ; mm5 = tmp2L pmaddwd mm3, [GOTOFF(ebx, PW_F184_MF076)] ; mm3 = tmp2H movq mm4, mm1 movq mm0, mm2 paddd mm1, mm5 ; mm1 = tmp10L paddd mm2, mm3 ; mm2 = tmp10H psubd mm4, mm5 ; mm4 = tmp12L psubd mm0, mm3 ; mm0 = tmp12H ; -- Final output stage movq mm5, mm1 movq mm3, mm2 paddd mm1, mm6 ; mm1 = data0L paddd mm2, mm7 ; mm2 = data0H psubd mm5, mm6 ; mm5 = data3L psubd mm3, mm7 ; mm3 = data3H movq mm6, [GOTOFF(ebx, PD_DESCALE_P1_4)] ; mm6 = [PD_DESCALE_P1_4] paddd mm1, mm6 paddd mm2, mm6 psrad mm1, DESCALE_P1_4 psrad mm2, DESCALE_P1_4 paddd mm5, mm6 paddd mm3, mm6 psrad mm5, DESCALE_P1_4 psrad mm3, DESCALE_P1_4 packssdw mm1, mm2 ; mm1 = data0 = (00 01 02 03) packssdw mm5, mm3 ; mm5 = data3 = (30 31 32 33) movq mm7, MMWORD [wk(0)] ; mm7 = tmp0L movq mm6, MMWORD [wk(1)] ; mm6 = tmp0H movq mm2, mm4 movq mm3, mm0 paddd mm4, mm7 ; mm4 = data1L paddd mm0, mm6 ; mm0 = data1H psubd mm2, mm7 ; mm2 = data2L psubd mm3, mm6 ; mm3 = data2H movq mm7, [GOTOFF(ebx, PD_DESCALE_P1_4)] ; mm7 = [PD_DESCALE_P1_4] paddd mm4, mm7 paddd mm0, mm7 psrad mm4, DESCALE_P1_4 psrad mm0, DESCALE_P1_4 paddd mm2, mm7 paddd mm3, mm7 psrad mm2, DESCALE_P1_4 psrad mm3, DESCALE_P1_4 packssdw mm4, mm0 ; mm4 = data1 = (10 11 12 13) packssdw mm2, mm3 ; mm2 = data2 = (20 21 22 23) movq mm6, mm1 ; transpose coefficients(phase 1) punpcklwd mm1, mm4 ; mm1 = (00 10 01 11) punpckhwd mm6, mm4 ; mm6 = (02 12 03 13) movq mm7, mm2 ; transpose coefficients(phase 1) punpcklwd mm2, mm5 ; mm2 = (20 30 21 31) punpckhwd mm7, mm5 ; mm7 = (22 32 23 33) movq mm0, mm1 ; transpose coefficients(phase 2) punpckldq mm1, mm2 ; mm1 = (00 10 20 30) punpckhdq mm0, mm2 ; mm0 = (01 11 21 31) movq mm3, mm6 ; transpose coefficients(phase 2) punpckldq mm6, mm7 ; mm6 = (02 12 22 32) punpckhdq mm3, mm7 ; mm3 = (03 13 23 33) movq MMWORD [MMBLOCK(0, 0, edi, SIZEOF_JCOEF)], mm1 movq MMWORD [MMBLOCK(1, 0, edi, SIZEOF_JCOEF)], mm0 movq MMWORD [MMBLOCK(2, 0, edi, SIZEOF_JCOEF)], mm6 movq MMWORD [MMBLOCK(3, 0, edi, SIZEOF_JCOEF)], mm3 .nextcolumn: add esi, byte 4 * SIZEOF_JCOEF ; coef_block add edx, byte 4 * SIZEOF_ISLOW_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)] ; -- Odd part movq mm0, MMWORD [MMBLOCK(1, 0, esi, SIZEOF_JCOEF)] movq mm1, MMWORD [MMBLOCK(3, 0, esi, SIZEOF_JCOEF)] movq mm2, MMWORD [MMBLOCK(5, 0, esi, SIZEOF_JCOEF)] movq mm3, MMWORD [MMBLOCK(7, 0, esi, SIZEOF_JCOEF)] movq mm4, mm0 movq mm5, mm0 punpcklwd mm4, mm1 punpckhwd mm5, mm1 movq mm0, mm4 movq mm1, mm5 pmaddwd mm4, [GOTOFF(ebx, PW_F256_F089)] ; mm4 = (tmp2L) pmaddwd mm5, [GOTOFF(ebx, PW_F256_F089)] ; mm5 = (tmp2H) pmaddwd mm0, [GOTOFF(ebx, PW_F106_MF217)] ; mm0 = (tmp0L) pmaddwd mm1, [GOTOFF(ebx, PW_F106_MF217)] ; mm1 = (tmp0H) movq mm6, mm2 movq mm7, mm2 punpcklwd mm6, mm3 punpckhwd mm7, mm3 movq mm2, mm6 movq mm3, mm7 pmaddwd mm6, [GOTOFF(ebx, PW_MF060_MF050)] ; mm6 = (tmp2L) pmaddwd mm7, [GOTOFF(ebx, PW_MF060_MF050)] ; mm7 = (tmp2H) pmaddwd mm2, [GOTOFF(ebx, PW_F145_MF021)] ; mm2 = (tmp0L) pmaddwd mm3, [GOTOFF(ebx, PW_F145_MF021)] ; mm3 = (tmp0H) paddd mm6, mm4 ; mm6 = tmp2L paddd mm7, mm5 ; mm7 = tmp2H paddd mm2, mm0 ; mm2 = tmp0L paddd mm3, mm1 ; mm3 = tmp0H movq MMWORD [wk(0)], mm2 ; wk(0) = tmp0L movq MMWORD [wk(1)], mm3 ; wk(1) = tmp0H ; -- Even part movq mm4, MMWORD [MMBLOCK(0, 0, esi, SIZEOF_JCOEF)] movq mm5, MMWORD [MMBLOCK(2, 0, esi, SIZEOF_JCOEF)] movq mm0, MMWORD [MMBLOCK(6, 0, esi, SIZEOF_JCOEF)] pxor mm1, mm1 pxor mm2, mm2 punpcklwd mm1, mm4 ; mm1 = tmp0L punpckhwd mm2, mm4 ; mm2 = tmp0H psrad mm1, (16 - CONST_BITS - 1) ; psrad mm1, 16 & pslld mm1, CONST_BITS + 1 psrad mm2, (16 - CONST_BITS - 1) ; psrad mm2, 16 & pslld mm2, CONST_BITS + 1 movq mm3, mm5 ; mm5 = in2 = z2 punpcklwd mm5, mm0 ; mm0 = in6 = z3 punpckhwd mm3, mm0 pmaddwd mm5, [GOTOFF(ebx, PW_F184_MF076)] ; mm5 = tmp2L pmaddwd mm3, [GOTOFF(ebx, PW_F184_MF076)] ; mm3 = tmp2H movq mm4, mm1 movq mm0, mm2 paddd mm1, mm5 ; mm1 = tmp10L paddd mm2, mm3 ; mm2 = tmp10H psubd mm4, mm5 ; mm4 = tmp12L psubd mm0, mm3 ; mm0 = tmp12H ; -- Final output stage movq mm5, mm1 movq mm3, mm2 paddd mm1, mm6 ; mm1 = data0L paddd mm2, mm7 ; mm2 = data0H psubd mm5, mm6 ; mm5 = data3L psubd mm3, mm7 ; mm3 = data3H movq mm6, [GOTOFF(ebx, PD_DESCALE_P2_4)] ; mm6 = [PD_DESCALE_P2_4] paddd mm1, mm6 paddd mm2, mm6 psrad mm1, DESCALE_P2_4 psrad mm2, DESCALE_P2_4 paddd mm5, mm6 paddd mm3, mm6 psrad mm5, DESCALE_P2_4 psrad mm3, DESCALE_P2_4 packssdw mm1, mm2 ; mm1 = data0 = (00 10 20 30) packssdw mm5, mm3 ; mm5 = data3 = (03 13 23 33) movq mm7, MMWORD [wk(0)] ; mm7 = tmp0L movq mm6, MMWORD [wk(1)] ; mm6 = tmp0H movq mm2, mm4 movq mm3, mm0 paddd mm4, mm7 ; mm4 = data1L paddd mm0, mm6 ; mm0 = data1H psubd mm2, mm7 ; mm2 = data2L psubd mm3, mm6 ; mm3 = data2H movq mm7, [GOTOFF(ebx, PD_DESCALE_P2_4)] ; mm7 = [PD_DESCALE_P2_4] paddd mm4, mm7 paddd mm0, mm7 psrad mm4, DESCALE_P2_4 psrad mm0, DESCALE_P2_4 paddd mm2, mm7 paddd mm3, mm7 psrad mm2, DESCALE_P2_4 psrad mm3, DESCALE_P2_4 packssdw mm4, mm0 ; mm4 = data1 = (01 11 21 31) packssdw mm2, mm3 ; mm2 = data2 = (02 12 22 32) movq mm6, [GOTOFF(ebx, PB_CENTERJSAMP)] ; mm6 = [PB_CENTERJSAMP] packsswb mm1, mm2 ; mm1 = (00 10 20 30 02 12 22 32) packsswb mm4, mm5 ; mm4 = (01 11 21 31 03 13 23 33) paddb mm1, mm6 paddb mm4, mm6 movq mm7, mm1 ; transpose coefficients(phase 1) punpcklbw mm1, mm4 ; mm1 = (00 01 10 11 20 21 30 31) punpckhbw mm7, mm4 ; mm7 = (02 03 12 13 22 23 32 33) movq mm0, mm1 ; transpose coefficients(phase 2) punpcklwd mm1, mm7 ; mm1 = (00 01 02 03 10 11 12 13) punpckhwd mm0, mm7 ; mm0 = (20 21 22 23 30 31 32 33) mov edx, JSAMPROW [edi + 0 * SIZEOF_JSAMPROW] mov esi, JSAMPROW [edi + 2 * SIZEOF_JSAMPROW] movd dword [edx + eax * SIZEOF_JSAMPLE], mm1 movd dword [esi + eax * SIZEOF_JSAMPLE], mm0 psrlq mm1, 4 * BYTE_BIT psrlq mm0, 4 * BYTE_BIT mov edx, JSAMPROW [edi + 1 * SIZEOF_JSAMPROW] mov esi, JSAMPROW [edi + 3 * SIZEOF_JSAMPROW] movd dword [edx + eax * SIZEOF_JSAMPLE], mm1 movd dword [esi + eax * SIZEOF_JSAMPLE], mm0 emms ; empty MMX state pop edi pop esi ; 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 ; -------------------------------------------------------------------------- ; ; Perform dequantization and inverse DCT on one block of coefficients, ; producing a reduced-size 2x2 output block. ; ; GLOBAL(void) ; jsimd_idct_2x2_mmx(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_mmx) EXTN(jsimd_idct_2x2_mmx): 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 movq mm0, MMWORD [MMBLOCK(1, 0, esi, SIZEOF_JCOEF)] movq mm1, MMWORD [MMBLOCK(3, 0, esi, SIZEOF_JCOEF)] pmullw mm0, MMWORD [MMBLOCK(1, 0, edx, SIZEOF_ISLOW_MULT_TYPE)] pmullw mm1, MMWORD [MMBLOCK(3, 0, edx, SIZEOF_ISLOW_MULT_TYPE)] movq mm2, MMWORD [MMBLOCK(5, 0, esi, SIZEOF_JCOEF)] movq mm3, MMWORD [MMBLOCK(7, 0, esi, SIZEOF_JCOEF)] pmullw mm2, MMWORD [MMBLOCK(5, 0, edx, SIZEOF_ISLOW_MULT_TYPE)] pmullw mm3, MMWORD [MMBLOCK(7, 0, edx, SIZEOF_ISLOW_MULT_TYPE)] ; mm0 = (10 11 ** 13) ; mm1 = (30 31 ** 33) ; mm2 = (50 51 ** 53) ; mm3 = (70 71 ** 73) pcmpeqd mm7, mm7 pslld mm7, WORD_BIT ; mm7 = { 0x0000 0xFFFF 0x0000 0xFFFF } movq mm4, mm0 ; mm4 = (10 11 ** 13) movq mm5, mm2 ; mm5 = (50 51 ** 53) punpcklwd mm4, mm1 ; mm4 = (10 30 11 31) punpcklwd mm5, mm3 ; mm5 = (50 70 51 71) pmaddwd mm4, [GOTOFF(ebx, PW_F362_MF127)] pmaddwd mm5, [GOTOFF(ebx, PW_F085_MF072)] psrld mm0, WORD_BIT ; mm0 = (11 -- 13 --) pand mm1, mm7 ; mm1 = (-- 31 -- 33) psrld mm2, WORD_BIT ; mm2 = (51 -- 53 --) pand mm3, mm7 ; mm3 = (-- 71 -- 73) por mm0, mm1 ; mm0 = (11 31 13 33) por mm2, mm3 ; mm2 = (51 71 53 73) pmaddwd mm0, [GOTOFF(ebx, PW_F362_MF127)] pmaddwd mm2, [GOTOFF(ebx, PW_F085_MF072)] paddd mm4, mm5 ; mm4 = tmp0[col0 col1] movq mm6, MMWORD [MMBLOCK(1, 1, esi, SIZEOF_JCOEF)] movq mm1, MMWORD [MMBLOCK(3, 1, esi, SIZEOF_JCOEF)] pmullw mm6, MMWORD [MMBLOCK(1, 1, edx, SIZEOF_ISLOW_MULT_TYPE)] pmullw mm1, MMWORD [MMBLOCK(3, 1, edx, SIZEOF_ISLOW_MULT_TYPE)] movq mm3, MMWORD [MMBLOCK(5, 1, esi, SIZEOF_JCOEF)] movq mm5, MMWORD [MMBLOCK(7, 1, esi, SIZEOF_JCOEF)] pmullw mm3, MMWORD [MMBLOCK(5, 1, edx, SIZEOF_ISLOW_MULT_TYPE)] pmullw mm5, MMWORD [MMBLOCK(7, 1, edx, SIZEOF_ISLOW_MULT_TYPE)] ; mm6 = (** 15 ** 17) ; mm1 = (** 35 ** 37) ; mm3 = (** 55 ** 57) ; mm5 = (** 75 ** 77) psrld mm6, WORD_BIT ; mm6 = (15 -- 17 --) pand mm1, mm7 ; mm1 = (-- 35 -- 37) psrld mm3, WORD_BIT ; mm3 = (55 -- 57 --) pand mm5, mm7 ; mm5 = (-- 75 -- 77) por mm6, mm1 ; mm6 = (15 35 17 37) por mm3, mm5 ; mm3 = (55 75 57 77) pmaddwd mm6, [GOTOFF(ebx, PW_F362_MF127)] pmaddwd mm3, [GOTOFF(ebx, PW_F085_MF072)] paddd mm0, mm2 ; mm0 = tmp0[col1 col3] paddd mm6, mm3 ; mm6 = tmp0[col5 col7] ; -- Even part movq mm1, MMWORD [MMBLOCK(0, 0, esi, SIZEOF_JCOEF)] movq mm5, MMWORD [MMBLOCK(0, 1, esi, SIZEOF_JCOEF)] pmullw mm1, MMWORD [MMBLOCK(0, 0, edx, SIZEOF_ISLOW_MULT_TYPE)] pmullw mm5, MMWORD [MMBLOCK(0, 1, edx, SIZEOF_ISLOW_MULT_TYPE)] ; mm1 = (00 01 ** 03) ; mm5 = (** 05 ** 07) movq mm2, mm1 ; mm2 = (00 01 ** 03) pslld mm1, WORD_BIT ; mm1 = (-- 00 -- **) psrad mm1, (WORD_BIT - CONST_BITS - 2) ; mm1 = tmp10[col0 ****] pand mm2, mm7 ; mm2 = (-- 01 -- 03) pand mm5, mm7 ; mm5 = (-- 05 -- 07) psrad mm2, (WORD_BIT - CONST_BITS - 2) ; mm2 = tmp10[col1 col3] psrad mm5, (WORD_BIT - CONST_BITS - 2) ; mm5 = tmp10[col5 col7] ; -- Final output stage movq mm3, mm1 paddd mm1, mm4 ; mm1 = data0[col0 ****] = (A0 **) psubd mm3, mm4 ; mm3 = data1[col0 ****] = (B0 **) punpckldq mm1, mm3 ; mm1 = (A0 B0) movq mm7, [GOTOFF(ebx, PD_DESCALE_P1_2)] ; mm7 = [PD_DESCALE_P1_2] movq mm4, mm2 movq mm3, mm5 paddd mm2, mm0 ; mm2 = data0[col1 col3] = (A1 A3) paddd mm5, mm6 ; mm5 = data0[col5 col7] = (A5 A7) psubd mm4, mm0 ; mm4 = data1[col1 col3] = (B1 B3) psubd mm3, mm6 ; mm3 = data1[col5 col7] = (B5 B7) paddd mm1, mm7 psrad mm1, DESCALE_P1_2 paddd mm2, mm7 paddd mm5, mm7 psrad mm2, DESCALE_P1_2 psrad mm5, DESCALE_P1_2 paddd mm4, mm7 paddd mm3, mm7 psrad mm4, DESCALE_P1_2 psrad mm3, DESCALE_P1_2 ; ---- 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 mm2, mm4 ; mm2 = (A1 A3 B1 B3) packssdw mm5, mm3 ; mm5 = (A5 A7 B5 B7) pmaddwd mm2, [GOTOFF(ebx, PW_F362_MF127)] pmaddwd mm5, [GOTOFF(ebx, PW_F085_MF072)] paddd mm2, mm5 ; mm2 = tmp0[row0 row1] ; -- Even part pslld mm1, (CONST_BITS + 2) ; mm1 = tmp10[row0 row1] ; -- Final output stage movq mm0, [GOTOFF(ebx, PD_DESCALE_P2_2)] ; mm0 = [PD_DESCALE_P2_2] movq mm6, mm1 paddd mm1, mm2 ; mm1 = data0[row0 row1] = (C0 C1) psubd mm6, mm2 ; mm6 = data1[row0 row1] = (D0 D1) paddd mm1, mm0 paddd mm6, mm0 psrad mm1, DESCALE_P2_2 psrad mm6, DESCALE_P2_2 movq mm7, mm1 ; transpose coefficients punpckldq mm1, mm6 ; mm1 = (C0 D0) punpckhdq mm7, mm6 ; mm7 = (C1 D1) packssdw mm1, mm7 ; mm1 = (C0 D0 C1 D1) packsswb mm1, mm1 ; mm1 = (C0 D0 C1 D1 C0 D0 C1 D1) paddb mm1, [GOTOFF(ebx, PB_CENTERJSAMP)] movd ecx, mm1 movd ebx, mm1 ; ebx = (C0 D0 C1 D1) shr ecx, 2 * BYTE_BIT ; 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 emms ; empty MMX state 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