Index: third_party/libjpeg_turbo/simd/jimmxfst.asm |
=================================================================== |
--- third_party/libjpeg_turbo/simd/jimmxfst.asm (revision 0) |
+++ third_party/libjpeg_turbo/simd/jimmxfst.asm (revision 0) |
@@ -0,0 +1,500 @@ |
+; |
+; jimmxfst.asm - fast integer IDCT (MMX) |
+; |
+; Copyright 2009 Pierre Ossman <ossman@cendio.se> 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 fast, not so accurate integer implementation of |
+; the inverse DCT (Discrete Cosine Transform). The following code is |
+; based directly on the IJG's original jidctfst.c; see the jidctfst.c |
+; for more details. |
+; |
+; [TAB8] |
+ |
+%include "jsimdext.inc" |
+%include "jdct.inc" |
+ |
+; -------------------------------------------------------------------------- |
+ |
+%define CONST_BITS 8 ; 14 is also OK. |
+%define PASS1_BITS 2 |
+ |
+%if IFAST_SCALE_BITS != PASS1_BITS |
+%error "'IFAST_SCALE_BITS' must be equal to 'PASS1_BITS'." |
+%endif |
+ |
+%if CONST_BITS == 8 |
+F_1_082 equ 277 ; FIX(1.082392200) |
+F_1_414 equ 362 ; FIX(1.414213562) |
+F_1_847 equ 473 ; FIX(1.847759065) |
+F_2_613 equ 669 ; FIX(2.613125930) |
+F_1_613 equ (F_2_613 - 256) ; FIX(2.613125930) - FIX(1) |
+%else |
+; NASM cannot do compile-time arithmetic on floating-point constants. |
+%define DESCALE(x,n) (((x)+(1<<((n)-1)))>>(n)) |
+F_1_082 equ DESCALE(1162209775,30-CONST_BITS) ; FIX(1.082392200) |
+F_1_414 equ DESCALE(1518500249,30-CONST_BITS) ; FIX(1.414213562) |
+F_1_847 equ DESCALE(1984016188,30-CONST_BITS) ; FIX(1.847759065) |
+F_2_613 equ DESCALE(2805822602,30-CONST_BITS) ; FIX(2.613125930) |
+F_1_613 equ (F_2_613 - (1 << CONST_BITS)) ; FIX(2.613125930) - FIX(1) |
+%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_idct_ifast_mmx) |
+ |
+EXTN(jconst_idct_ifast_mmx): |
+ |
+PW_F1414 times 4 dw F_1_414 << CONST_SHIFT |
+PW_F1847 times 4 dw F_1_847 << CONST_SHIFT |
+PW_MF1613 times 4 dw -F_1_613 << CONST_SHIFT |
+PW_F1082 times 4 dw F_1_082 << CONST_SHIFT |
+PB_CENTERJSAMP times 8 db CENTERJSAMPLE |
+ |
+ alignz 16 |
+ |
+; -------------------------------------------------------------------------- |
+ SECTION SEG_TEXT |
+ BITS 32 |
+; |
+; Perform dequantization and inverse DCT on one block of coefficients. |
+; |
+; GLOBAL(void) |
+; jsimd_idct_ifast_mmx (void * dct_table, JCOEFPTR coef_block, |
+; JSAMPARRAY output_buf, JDIMENSION output_col) |
+; |
+ |
+%define dct_table(b) (b)+8 ; jpeg_component_info * compptr |
+%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 16 |
+ global EXTN(jsimd_idct_ifast_mmx) |
+ |
+EXTN(jsimd_idct_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, [workspace] |
+ 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, 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_IFAST_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(4,0,esi,SIZEOF_JCOEF)] |
+ por mm0, MMWORD [MMBLOCK(5,0,esi,SIZEOF_JCOEF)] |
+ por mm1, MMWORD [MMBLOCK(6,0,esi,SIZEOF_JCOEF)] |
+ por mm0, MMWORD [MMBLOCK(7,0,esi,SIZEOF_JCOEF)] |
+ por mm1,mm0 |
+ packsswb mm1,mm1 |
+ movd eax,mm1 |
+ 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_IFAST_MULT_TYPE)] |
+ |
+ 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(0,1,edi,SIZEOF_JCOEF)], mm0 |
+ movq MMWORD [MMBLOCK(1,0,edi,SIZEOF_JCOEF)], mm1 |
+ movq MMWORD [MMBLOCK(1,1,edi,SIZEOF_JCOEF)], mm1 |
+ movq MMWORD [MMBLOCK(2,0,edi,SIZEOF_JCOEF)], mm2 |
+ movq MMWORD [MMBLOCK(2,1,edi,SIZEOF_JCOEF)], mm2 |
+ movq MMWORD [MMBLOCK(3,0,edi,SIZEOF_JCOEF)], mm3 |
+ movq MMWORD [MMBLOCK(3,1,edi,SIZEOF_JCOEF)], mm3 |
+ jmp near .nextcolumn |
+ alignx 16,7 |
+%endif |
+.columnDCT: |
+ |
+ ; -- Even part |
+ |
+ movq mm0, MMWORD [MMBLOCK(0,0,esi,SIZEOF_JCOEF)] |
+ movq mm1, MMWORD [MMBLOCK(2,0,esi,SIZEOF_JCOEF)] |
+ pmullw mm0, MMWORD [MMBLOCK(0,0,edx,SIZEOF_IFAST_MULT_TYPE)] |
+ pmullw mm1, MMWORD [MMBLOCK(2,0,edx,SIZEOF_IFAST_MULT_TYPE)] |
+ movq mm2, MMWORD [MMBLOCK(4,0,esi,SIZEOF_JCOEF)] |
+ movq mm3, MMWORD [MMBLOCK(6,0,esi,SIZEOF_JCOEF)] |
+ pmullw mm2, MMWORD [MMBLOCK(4,0,edx,SIZEOF_IFAST_MULT_TYPE)] |
+ pmullw mm3, MMWORD [MMBLOCK(6,0,edx,SIZEOF_IFAST_MULT_TYPE)] |
+ |
+ movq mm4,mm0 |
+ movq mm5,mm1 |
+ psubw mm0,mm2 ; mm0=tmp11 |
+ psubw mm1,mm3 |
+ paddw mm4,mm2 ; mm4=tmp10 |
+ paddw mm5,mm3 ; mm5=tmp13 |
+ |
+ psllw mm1,PRE_MULTIPLY_SCALE_BITS |
+ pmulhw mm1,[GOTOFF(ebx,PW_F1414)] |
+ psubw mm1,mm5 ; mm1=tmp12 |
+ |
+ movq mm6,mm4 |
+ movq mm7,mm0 |
+ psubw mm4,mm5 ; mm4=tmp3 |
+ psubw mm0,mm1 ; mm0=tmp2 |
+ paddw mm6,mm5 ; mm6=tmp0 |
+ paddw mm7,mm1 ; mm7=tmp1 |
+ |
+ movq MMWORD [wk(1)], mm4 ; wk(1)=tmp3 |
+ movq MMWORD [wk(0)], mm0 ; wk(0)=tmp2 |
+ |
+ ; -- Odd part |
+ |
+ movq mm2, MMWORD [MMBLOCK(1,0,esi,SIZEOF_JCOEF)] |
+ movq mm3, MMWORD [MMBLOCK(3,0,esi,SIZEOF_JCOEF)] |
+ pmullw mm2, MMWORD [MMBLOCK(1,0,edx,SIZEOF_IFAST_MULT_TYPE)] |
+ pmullw mm3, MMWORD [MMBLOCK(3,0,edx,SIZEOF_IFAST_MULT_TYPE)] |
+ movq mm5, MMWORD [MMBLOCK(5,0,esi,SIZEOF_JCOEF)] |
+ movq mm1, MMWORD [MMBLOCK(7,0,esi,SIZEOF_JCOEF)] |
+ pmullw mm5, MMWORD [MMBLOCK(5,0,edx,SIZEOF_IFAST_MULT_TYPE)] |
+ pmullw mm1, MMWORD [MMBLOCK(7,0,edx,SIZEOF_IFAST_MULT_TYPE)] |
+ |
+ movq mm4,mm2 |
+ movq mm0,mm5 |
+ psubw mm2,mm1 ; mm2=z12 |
+ psubw mm5,mm3 ; mm5=z10 |
+ paddw mm4,mm1 ; mm4=z11 |
+ paddw mm0,mm3 ; mm0=z13 |
+ |
+ movq mm1,mm5 ; mm1=z10(unscaled) |
+ psllw mm2,PRE_MULTIPLY_SCALE_BITS |
+ psllw mm5,PRE_MULTIPLY_SCALE_BITS |
+ |
+ movq mm3,mm4 |
+ psubw mm4,mm0 |
+ paddw mm3,mm0 ; mm3=tmp7 |
+ |
+ psllw mm4,PRE_MULTIPLY_SCALE_BITS |
+ pmulhw mm4,[GOTOFF(ebx,PW_F1414)] ; mm4=tmp11 |
+ |
+ ; To avoid overflow... |
+ ; |
+ ; (Original) |
+ ; tmp12 = -2.613125930 * z10 + z5; |
+ ; |
+ ; (This implementation) |
+ ; tmp12 = (-1.613125930 - 1) * z10 + z5; |
+ ; = -1.613125930 * z10 - z10 + z5; |
+ |
+ movq mm0,mm5 |
+ paddw mm5,mm2 |
+ pmulhw mm5,[GOTOFF(ebx,PW_F1847)] ; mm5=z5 |
+ pmulhw mm0,[GOTOFF(ebx,PW_MF1613)] |
+ pmulhw mm2,[GOTOFF(ebx,PW_F1082)] |
+ psubw mm0,mm1 |
+ psubw mm2,mm5 ; mm2=tmp10 |
+ paddw mm0,mm5 ; mm0=tmp12 |
+ |
+ ; -- Final output stage |
+ |
+ psubw mm0,mm3 ; mm0=tmp6 |
+ movq mm1,mm6 |
+ movq mm5,mm7 |
+ paddw mm6,mm3 ; mm6=data0=(00 01 02 03) |
+ paddw mm7,mm0 ; mm7=data1=(10 11 12 13) |
+ psubw mm1,mm3 ; mm1=data7=(70 71 72 73) |
+ psubw mm5,mm0 ; mm5=data6=(60 61 62 63) |
+ psubw mm4,mm0 ; mm4=tmp5 |
+ |
+ movq mm3,mm6 ; transpose coefficients(phase 1) |
+ punpcklwd mm6,mm7 ; mm6=(00 10 01 11) |
+ punpckhwd mm3,mm7 ; mm3=(02 12 03 13) |
+ movq mm0,mm5 ; transpose coefficients(phase 1) |
+ punpcklwd mm5,mm1 ; mm5=(60 70 61 71) |
+ punpckhwd mm0,mm1 ; mm0=(62 72 63 73) |
+ |
+ movq mm7, MMWORD [wk(0)] ; mm7=tmp2 |
+ movq mm1, MMWORD [wk(1)] ; mm1=tmp3 |
+ |
+ movq MMWORD [wk(0)], mm5 ; wk(0)=(60 70 61 71) |
+ movq MMWORD [wk(1)], mm0 ; wk(1)=(62 72 63 73) |
+ |
+ paddw mm2,mm4 ; mm2=tmp4 |
+ movq mm5,mm7 |
+ movq mm0,mm1 |
+ paddw mm7,mm4 ; mm7=data2=(20 21 22 23) |
+ paddw mm1,mm2 ; mm1=data4=(40 41 42 43) |
+ psubw mm5,mm4 ; mm5=data5=(50 51 52 53) |
+ psubw mm0,mm2 ; mm0=data3=(30 31 32 33) |
+ |
+ movq mm4,mm7 ; transpose coefficients(phase 1) |
+ punpcklwd mm7,mm0 ; mm7=(20 30 21 31) |
+ punpckhwd mm4,mm0 ; mm4=(22 32 23 33) |
+ movq mm2,mm1 ; transpose coefficients(phase 1) |
+ punpcklwd mm1,mm5 ; mm1=(40 50 41 51) |
+ punpckhwd mm2,mm5 ; mm2=(42 52 43 53) |
+ |
+ movq mm0,mm6 ; transpose coefficients(phase 2) |
+ punpckldq mm6,mm7 ; mm6=(00 10 20 30) |
+ punpckhdq mm0,mm7 ; mm0=(01 11 21 31) |
+ movq mm5,mm3 ; transpose coefficients(phase 2) |
+ punpckldq mm3,mm4 ; mm3=(02 12 22 32) |
+ punpckhdq mm5,mm4 ; mm5=(03 13 23 33) |
+ |
+ movq mm7, MMWORD [wk(0)] ; mm7=(60 70 61 71) |
+ movq mm4, MMWORD [wk(1)] ; mm4=(62 72 63 73) |
+ |
+ movq MMWORD [MMBLOCK(0,0,edi,SIZEOF_JCOEF)], mm6 |
+ movq MMWORD [MMBLOCK(1,0,edi,SIZEOF_JCOEF)], mm0 |
+ movq MMWORD [MMBLOCK(2,0,edi,SIZEOF_JCOEF)], mm3 |
+ movq MMWORD [MMBLOCK(3,0,edi,SIZEOF_JCOEF)], mm5 |
+ |
+ movq mm6,mm1 ; transpose coefficients(phase 2) |
+ punpckldq mm1,mm7 ; mm1=(40 50 60 70) |
+ punpckhdq mm6,mm7 ; mm6=(41 51 61 71) |
+ movq mm0,mm2 ; transpose coefficients(phase 2) |
+ punpckldq mm2,mm4 ; mm2=(42 52 62 72) |
+ punpckhdq mm0,mm4 ; mm0=(43 53 63 73) |
+ |
+ movq MMWORD [MMBLOCK(0,1,edi,SIZEOF_JCOEF)], mm1 |
+ movq MMWORD [MMBLOCK(1,1,edi,SIZEOF_JCOEF)], mm6 |
+ movq MMWORD [MMBLOCK(2,1,edi,SIZEOF_JCOEF)], mm2 |
+ movq MMWORD [MMBLOCK(3,1,edi,SIZEOF_JCOEF)], mm0 |
+ |
+.nextcolumn: |
+ add esi, byte 4*SIZEOF_JCOEF ; coef_block |
+ add edx, byte 4*SIZEOF_IFAST_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)] |
+ mov ecx, DCTSIZE/4 ; ctr |
+ alignx 16,7 |
+.rowloop: |
+ |
+ ; -- Even part |
+ |
+ movq mm0, MMWORD [MMBLOCK(0,0,esi,SIZEOF_JCOEF)] |
+ movq mm1, MMWORD [MMBLOCK(2,0,esi,SIZEOF_JCOEF)] |
+ movq mm2, MMWORD [MMBLOCK(4,0,esi,SIZEOF_JCOEF)] |
+ movq mm3, MMWORD [MMBLOCK(6,0,esi,SIZEOF_JCOEF)] |
+ |
+ movq mm4,mm0 |
+ movq mm5,mm1 |
+ psubw mm0,mm2 ; mm0=tmp11 |
+ psubw mm1,mm3 |
+ paddw mm4,mm2 ; mm4=tmp10 |
+ paddw mm5,mm3 ; mm5=tmp13 |
+ |
+ psllw mm1,PRE_MULTIPLY_SCALE_BITS |
+ pmulhw mm1,[GOTOFF(ebx,PW_F1414)] |
+ psubw mm1,mm5 ; mm1=tmp12 |
+ |
+ movq mm6,mm4 |
+ movq mm7,mm0 |
+ psubw mm4,mm5 ; mm4=tmp3 |
+ psubw mm0,mm1 ; mm0=tmp2 |
+ paddw mm6,mm5 ; mm6=tmp0 |
+ paddw mm7,mm1 ; mm7=tmp1 |
+ |
+ movq MMWORD [wk(1)], mm4 ; wk(1)=tmp3 |
+ movq MMWORD [wk(0)], mm0 ; wk(0)=tmp2 |
+ |
+ ; -- Odd part |
+ |
+ movq mm2, MMWORD [MMBLOCK(1,0,esi,SIZEOF_JCOEF)] |
+ movq mm3, MMWORD [MMBLOCK(3,0,esi,SIZEOF_JCOEF)] |
+ movq mm5, MMWORD [MMBLOCK(5,0,esi,SIZEOF_JCOEF)] |
+ movq mm1, MMWORD [MMBLOCK(7,0,esi,SIZEOF_JCOEF)] |
+ |
+ movq mm4,mm2 |
+ movq mm0,mm5 |
+ psubw mm2,mm1 ; mm2=z12 |
+ psubw mm5,mm3 ; mm5=z10 |
+ paddw mm4,mm1 ; mm4=z11 |
+ paddw mm0,mm3 ; mm0=z13 |
+ |
+ movq mm1,mm5 ; mm1=z10(unscaled) |
+ psllw mm2,PRE_MULTIPLY_SCALE_BITS |
+ psllw mm5,PRE_MULTIPLY_SCALE_BITS |
+ |
+ movq mm3,mm4 |
+ psubw mm4,mm0 |
+ paddw mm3,mm0 ; mm3=tmp7 |
+ |
+ psllw mm4,PRE_MULTIPLY_SCALE_BITS |
+ pmulhw mm4,[GOTOFF(ebx,PW_F1414)] ; mm4=tmp11 |
+ |
+ ; To avoid overflow... |
+ ; |
+ ; (Original) |
+ ; tmp12 = -2.613125930 * z10 + z5; |
+ ; |
+ ; (This implementation) |
+ ; tmp12 = (-1.613125930 - 1) * z10 + z5; |
+ ; = -1.613125930 * z10 - z10 + z5; |
+ |
+ movq mm0,mm5 |
+ paddw mm5,mm2 |
+ pmulhw mm5,[GOTOFF(ebx,PW_F1847)] ; mm5=z5 |
+ pmulhw mm0,[GOTOFF(ebx,PW_MF1613)] |
+ pmulhw mm2,[GOTOFF(ebx,PW_F1082)] |
+ psubw mm0,mm1 |
+ psubw mm2,mm5 ; mm2=tmp10 |
+ paddw mm0,mm5 ; mm0=tmp12 |
+ |
+ ; -- Final output stage |
+ |
+ psubw mm0,mm3 ; mm0=tmp6 |
+ movq mm1,mm6 |
+ movq mm5,mm7 |
+ paddw mm6,mm3 ; mm6=data0=(00 10 20 30) |
+ paddw mm7,mm0 ; mm7=data1=(01 11 21 31) |
+ psraw mm6,(PASS1_BITS+3) ; descale |
+ psraw mm7,(PASS1_BITS+3) ; descale |
+ psubw mm1,mm3 ; mm1=data7=(07 17 27 37) |
+ psubw mm5,mm0 ; mm5=data6=(06 16 26 36) |
+ psraw mm1,(PASS1_BITS+3) ; descale |
+ psraw mm5,(PASS1_BITS+3) ; descale |
+ psubw mm4,mm0 ; mm4=tmp5 |
+ |
+ packsswb mm6,mm5 ; mm6=(00 10 20 30 06 16 26 36) |
+ packsswb mm7,mm1 ; mm7=(01 11 21 31 07 17 27 37) |
+ |
+ movq mm3, MMWORD [wk(0)] ; mm3=tmp2 |
+ movq mm0, MMWORD [wk(1)] ; mm0=tmp3 |
+ |
+ paddw mm2,mm4 ; mm2=tmp4 |
+ movq mm5,mm3 |
+ movq mm1,mm0 |
+ paddw mm3,mm4 ; mm3=data2=(02 12 22 32) |
+ paddw mm0,mm2 ; mm0=data4=(04 14 24 34) |
+ psraw mm3,(PASS1_BITS+3) ; descale |
+ psraw mm0,(PASS1_BITS+3) ; descale |
+ psubw mm5,mm4 ; mm5=data5=(05 15 25 35) |
+ psubw mm1,mm2 ; mm1=data3=(03 13 23 33) |
+ psraw mm5,(PASS1_BITS+3) ; descale |
+ psraw mm1,(PASS1_BITS+3) ; descale |
+ |
+ movq mm4,[GOTOFF(ebx,PB_CENTERJSAMP)] ; mm4=[PB_CENTERJSAMP] |
+ |
+ packsswb mm3,mm0 ; mm3=(02 12 22 32 04 14 24 34) |
+ packsswb mm1,mm5 ; mm1=(03 13 23 33 05 15 25 35) |
+ |
+ paddb mm6,mm4 |
+ paddb mm7,mm4 |
+ paddb mm3,mm4 |
+ paddb mm1,mm4 |
+ |
+ movq mm2,mm6 ; transpose coefficients(phase 1) |
+ punpcklbw mm6,mm7 ; mm6=(00 01 10 11 20 21 30 31) |
+ punpckhbw mm2,mm7 ; mm2=(06 07 16 17 26 27 36 37) |
+ movq mm0,mm3 ; transpose coefficients(phase 1) |
+ punpcklbw mm3,mm1 ; mm3=(02 03 12 13 22 23 32 33) |
+ punpckhbw mm0,mm1 ; mm0=(04 05 14 15 24 25 34 35) |
+ |
+ movq mm5,mm6 ; transpose coefficients(phase 2) |
+ punpcklwd mm6,mm3 ; mm6=(00 01 02 03 10 11 12 13) |
+ punpckhwd mm5,mm3 ; mm5=(20 21 22 23 30 31 32 33) |
+ movq mm4,mm0 ; transpose coefficients(phase 2) |
+ punpcklwd mm0,mm2 ; mm0=(04 05 06 07 14 15 16 17) |
+ punpckhwd mm4,mm2 ; mm4=(24 25 26 27 34 35 36 37) |
+ |
+ movq mm7,mm6 ; transpose coefficients(phase 3) |
+ punpckldq mm6,mm0 ; mm6=(00 01 02 03 04 05 06 07) |
+ punpckhdq mm7,mm0 ; mm7=(10 11 12 13 14 15 16 17) |
+ movq mm1,mm5 ; transpose coefficients(phase 3) |
+ punpckldq mm5,mm4 ; mm5=(20 21 22 23 24 25 26 27) |
+ punpckhdq mm1,mm4 ; mm1=(30 31 32 33 34 35 36 37) |
+ |
+ pushpic ebx ; save GOT address |
+ |
+ mov edx, JSAMPROW [edi+0*SIZEOF_JSAMPROW] |
+ mov ebx, JSAMPROW [edi+1*SIZEOF_JSAMPROW] |
+ movq MMWORD [edx+eax*SIZEOF_JSAMPLE], mm6 |
+ movq MMWORD [ebx+eax*SIZEOF_JSAMPLE], mm7 |
+ mov edx, JSAMPROW [edi+2*SIZEOF_JSAMPROW] |
+ mov ebx, JSAMPROW [edi+3*SIZEOF_JSAMPROW] |
+ movq MMWORD [edx+eax*SIZEOF_JSAMPLE], mm5 |
+ movq MMWORD [ebx+eax*SIZEOF_JSAMPLE], mm1 |
+ |
+ poppic ebx ; restore GOT address |
+ |
+ add esi, byte 4*SIZEOF_JCOEF ; wsptr |
+ add edi, byte 4*SIZEOF_JSAMPROW |
+ dec ecx ; ctr |
+ jnz near .rowloop |
+ |
+ emms ; empty MMX state |
+ |
+ pop edi |
+ pop esi |
+; pop edx ; need not be preserved |
+; pop ecx ; need not be preserved |
+ pop 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 |