| ; |
| ; jquanti.asm - sample data conversion and quantization (SSE2) |
| ; |
| ; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB |
| ; |
| ; 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), |
| ; 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 |
| ; |
| ; [TAB8] |
| |
| %include "jsimdext.inc" |
| %include "jdct.inc" |
| |
| ; -------------------------------------------------------------------------- |
| SECTION SEG_TEXT |
| BITS 32 |
| ; |
| ; Load data into workspace, applying unsigned->signed conversion |
| ; |
| ; GLOBAL(void) |
| ; jsimd_convsamp_sse2 (JSAMPARRAY sample_data, JDIMENSION start_col, |
| ; DCTELEM *workspace); |
| ; |
| |
| %define sample_data ebp+8 ; JSAMPARRAY sample_data |
| %define start_col ebp+12 ; JDIMENSION start_col |
| %define workspace ebp+16 ; DCTELEM *workspace |
| |
| align 16 |
| global EXTN(jsimd_convsamp_sse2) PRIVATE |
| |
| EXTN(jsimd_convsamp_sse2): |
| push ebp |
| mov ebp,esp |
| push ebx |
| ; push ecx ; need not be preserved |
| ; push edx ; need not be preserved |
| push esi |
| push edi |
| |
| pxor xmm6,xmm6 ; xmm6=(all 0's) |
| pcmpeqw xmm7,xmm7 |
| psllw xmm7,7 ; xmm7={0xFF80 0xFF80 0xFF80 0xFF80 ..} |
| |
| mov esi, JSAMPARRAY [sample_data] ; (JSAMPROW *) |
| mov eax, JDIMENSION [start_col] |
| mov edi, POINTER [workspace] ; (DCTELEM *) |
| mov ecx, DCTSIZE/4 |
| alignx 16,7 |
| .convloop: |
| mov ebx, JSAMPROW [esi+0*SIZEOF_JSAMPROW] ; (JSAMPLE *) |
| mov edx, JSAMPROW [esi+1*SIZEOF_JSAMPROW] ; (JSAMPLE *) |
| |
| movq xmm0, XMM_MMWORD [ebx+eax*SIZEOF_JSAMPLE] ; xmm0=(01234567) |
| movq xmm1, XMM_MMWORD [edx+eax*SIZEOF_JSAMPLE] ; xmm1=(89ABCDEF) |
| |
| mov ebx, JSAMPROW [esi+2*SIZEOF_JSAMPROW] ; (JSAMPLE *) |
| mov edx, JSAMPROW [esi+3*SIZEOF_JSAMPROW] ; (JSAMPLE *) |
| |
| movq xmm2, XMM_MMWORD [ebx+eax*SIZEOF_JSAMPLE] ; xmm2=(GHIJKLMN) |
| movq xmm3, XMM_MMWORD [edx+eax*SIZEOF_JSAMPLE] ; xmm3=(OPQRSTUV) |
| |
| punpcklbw xmm0,xmm6 ; xmm0=(01234567) |
| punpcklbw xmm1,xmm6 ; xmm1=(89ABCDEF) |
| paddw xmm0,xmm7 |
| paddw xmm1,xmm7 |
| punpcklbw xmm2,xmm6 ; xmm2=(GHIJKLMN) |
| punpcklbw xmm3,xmm6 ; xmm3=(OPQRSTUV) |
| paddw xmm2,xmm7 |
| paddw xmm3,xmm7 |
| |
| movdqa XMMWORD [XMMBLOCK(0,0,edi,SIZEOF_DCTELEM)], xmm0 |
| movdqa XMMWORD [XMMBLOCK(1,0,edi,SIZEOF_DCTELEM)], xmm1 |
| movdqa XMMWORD [XMMBLOCK(2,0,edi,SIZEOF_DCTELEM)], xmm2 |
| movdqa XMMWORD [XMMBLOCK(3,0,edi,SIZEOF_DCTELEM)], xmm3 |
| |
| add esi, byte 4*SIZEOF_JSAMPROW |
| add edi, byte 4*DCTSIZE*SIZEOF_DCTELEM |
| dec ecx |
| jnz short .convloop |
| |
| pop edi |
| pop esi |
| ; pop edx ; need not be preserved |
| ; pop ecx ; need not be preserved |
| pop ebx |
| pop ebp |
| ret |
| |
| ; -------------------------------------------------------------------------- |
| ; |
| ; Quantize/descale the coefficients, and store into coef_block |
| ; |
| ; This implementation is based on an algorithm described in |
| ; "How to optimize for the Pentium family of microprocessors" |
| ; (http://www.agner.org/assem/). |
| ; |
| ; GLOBAL(void) |
| ; jsimd_quantize_sse2 (JCOEFPTR coef_block, DCTELEM *divisors, |
| ; DCTELEM *workspace); |
| ; |
| |
| %define RECIPROCAL(m,n,b) XMMBLOCK(DCTSIZE*0+(m),(n),(b),SIZEOF_DCTELEM) |
| %define CORRECTION(m,n,b) XMMBLOCK(DCTSIZE*1+(m),(n),(b),SIZEOF_DCTELEM) |
| %define SCALE(m,n,b) XMMBLOCK(DCTSIZE*2+(m),(n),(b),SIZEOF_DCTELEM) |
| |
| %define coef_block ebp+8 ; JCOEFPTR coef_block |
| %define divisors ebp+12 ; DCTELEM *divisors |
| %define workspace ebp+16 ; DCTELEM *workspace |
| |
| align 16 |
| global EXTN(jsimd_quantize_sse2) PRIVATE |
| |
| EXTN(jsimd_quantize_sse2): |
| push ebp |
| mov ebp,esp |
| ; push ebx ; unused |
| ; push ecx ; unused |
| ; push edx ; need not be preserved |
| push esi |
| push edi |
| |
| mov esi, POINTER [workspace] |
| mov edx, POINTER [divisors] |
| mov edi, JCOEFPTR [coef_block] |
| mov eax, DCTSIZE2/32 |
| alignx 16,7 |
| .quantloop: |
| movdqa xmm4, XMMWORD [XMMBLOCK(0,0,esi,SIZEOF_DCTELEM)] |
| movdqa xmm5, XMMWORD [XMMBLOCK(1,0,esi,SIZEOF_DCTELEM)] |
| movdqa xmm6, XMMWORD [XMMBLOCK(2,0,esi,SIZEOF_DCTELEM)] |
| movdqa xmm7, XMMWORD [XMMBLOCK(3,0,esi,SIZEOF_DCTELEM)] |
| movdqa xmm0,xmm4 |
| movdqa xmm1,xmm5 |
| movdqa xmm2,xmm6 |
| movdqa xmm3,xmm7 |
| psraw xmm4,(WORD_BIT-1) |
| psraw xmm5,(WORD_BIT-1) |
| psraw xmm6,(WORD_BIT-1) |
| psraw xmm7,(WORD_BIT-1) |
| pxor xmm0,xmm4 |
| pxor xmm1,xmm5 |
| pxor xmm2,xmm6 |
| pxor xmm3,xmm7 |
| psubw xmm0,xmm4 ; if (xmm0 < 0) xmm0 = -xmm0; |
| psubw xmm1,xmm5 ; if (xmm1 < 0) xmm1 = -xmm1; |
| psubw xmm2,xmm6 ; if (xmm2 < 0) xmm2 = -xmm2; |
| psubw xmm3,xmm7 ; if (xmm3 < 0) xmm3 = -xmm3; |
| |
| paddw xmm0, XMMWORD [CORRECTION(0,0,edx)] ; correction + roundfactor |
| paddw xmm1, XMMWORD [CORRECTION(1,0,edx)] |
| paddw xmm2, XMMWORD [CORRECTION(2,0,edx)] |
| paddw xmm3, XMMWORD [CORRECTION(3,0,edx)] |
| pmulhuw xmm0, XMMWORD [RECIPROCAL(0,0,edx)] ; reciprocal |
| pmulhuw xmm1, XMMWORD [RECIPROCAL(1,0,edx)] |
| pmulhuw xmm2, XMMWORD [RECIPROCAL(2,0,edx)] |
| pmulhuw xmm3, XMMWORD [RECIPROCAL(3,0,edx)] |
| pmulhuw xmm0, XMMWORD [SCALE(0,0,edx)] ; scale |
| pmulhuw xmm1, XMMWORD [SCALE(1,0,edx)] |
| pmulhuw xmm2, XMMWORD [SCALE(2,0,edx)] |
| pmulhuw xmm3, XMMWORD [SCALE(3,0,edx)] |
| |
| pxor xmm0,xmm4 |
| pxor xmm1,xmm5 |
| pxor xmm2,xmm6 |
| pxor xmm3,xmm7 |
| psubw xmm0,xmm4 |
| psubw xmm1,xmm5 |
| psubw xmm2,xmm6 |
| psubw xmm3,xmm7 |
| movdqa XMMWORD [XMMBLOCK(0,0,edi,SIZEOF_DCTELEM)], xmm0 |
| movdqa XMMWORD [XMMBLOCK(1,0,edi,SIZEOF_DCTELEM)], xmm1 |
| movdqa XMMWORD [XMMBLOCK(2,0,edi,SIZEOF_DCTELEM)], xmm2 |
| movdqa XMMWORD [XMMBLOCK(3,0,edi,SIZEOF_DCTELEM)], xmm3 |
| |
| add esi, byte 32*SIZEOF_DCTELEM |
| add edx, byte 32*SIZEOF_DCTELEM |
| add edi, byte 32*SIZEOF_JCOEF |
| dec eax |
| jnz near .quantloop |
| |
| pop edi |
| pop esi |
| ; pop edx ; need not be preserved |
| ; pop ecx ; unused |
| ; pop ebx ; unused |
| 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 |
