| ; |
| ; jquantf.asm - sample data conversion and quantization (SSE & SSE2) |
| ; |
| ; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB |
| ; Copyright (C) 2016, 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), |
| ; 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_float_sse2(JSAMPARRAY sample_data, JDIMENSION start_col, |
| ; FAST_FLOAT *workspace); |
| ; |
| |
| %define sample_data ebp + 8 ; JSAMPARRAY sample_data |
| %define start_col ebp + 12 ; JDIMENSION start_col |
| %define workspace ebp + 16 ; FAST_FLOAT *workspace |
| |
| align 32 |
| GLOBAL_FUNCTION(jsimd_convsamp_float_sse2) |
| |
| EXTN(jsimd_convsamp_float_sse2): |
| push ebp |
| mov ebp, esp |
| push ebx |
| ; push ecx ; need not be preserved |
| ; push edx ; need not be preserved |
| push esi |
| push edi |
| |
| pcmpeqw xmm7, xmm7 |
| psllw xmm7, 7 |
| packsswb xmm7, xmm7 ; xmm7 = PB_CENTERJSAMPLE (0x808080..) |
| |
| mov esi, JSAMPARRAY [sample_data] ; (JSAMPROW *) |
| mov eax, JDIMENSION [start_col] |
| mov edi, POINTER [workspace] ; (DCTELEM *) |
| mov ecx, DCTSIZE/2 |
| 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] |
| movq xmm1, XMM_MMWORD [edx+eax*SIZEOF_JSAMPLE] |
| |
| psubb xmm0, xmm7 ; xmm0=(01234567) |
| psubb xmm1, xmm7 ; xmm1=(89ABCDEF) |
| |
| punpcklbw xmm0, xmm0 ; xmm0=(*0*1*2*3*4*5*6*7) |
| punpcklbw xmm1, xmm1 ; xmm1=(*8*9*A*B*C*D*E*F) |
| |
| punpcklwd xmm2, xmm0 ; xmm2=(***0***1***2***3) |
| punpckhwd xmm0, xmm0 ; xmm0=(***4***5***6***7) |
| punpcklwd xmm3, xmm1 ; xmm3=(***8***9***A***B) |
| punpckhwd xmm1, xmm1 ; xmm1=(***C***D***E***F) |
| |
| psrad xmm2, (DWORD_BIT-BYTE_BIT) ; xmm2=(0123) |
| psrad xmm0, (DWORD_BIT-BYTE_BIT) ; xmm0=(4567) |
| cvtdq2ps xmm2, xmm2 ; xmm2=(0123) |
| cvtdq2ps xmm0, xmm0 ; xmm0=(4567) |
| psrad xmm3, (DWORD_BIT-BYTE_BIT) ; xmm3=(89AB) |
| psrad xmm1, (DWORD_BIT-BYTE_BIT) ; xmm1=(CDEF) |
| cvtdq2ps xmm3, xmm3 ; xmm3=(89AB) |
| cvtdq2ps xmm1, xmm1 ; xmm1=(CDEF) |
| |
| movaps XMMWORD [XMMBLOCK(0,0,edi,SIZEOF_FAST_FLOAT)], xmm2 |
| movaps XMMWORD [XMMBLOCK(0,1,edi,SIZEOF_FAST_FLOAT)], xmm0 |
| movaps XMMWORD [XMMBLOCK(1,0,edi,SIZEOF_FAST_FLOAT)], xmm3 |
| movaps XMMWORD [XMMBLOCK(1,1,edi,SIZEOF_FAST_FLOAT)], xmm1 |
| |
| add esi, byte 2*SIZEOF_JSAMPROW |
| add edi, byte 2*DCTSIZE*SIZEOF_FAST_FLOAT |
| 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 |
| ; |
| ; GLOBAL(void) |
| ; jsimd_quantize_float_sse2(JCOEFPTR coef_block, FAST_FLOAT *divisors, |
| ; FAST_FLOAT *workspace); |
| ; |
| |
| %define coef_block ebp + 8 ; JCOEFPTR coef_block |
| %define divisors ebp + 12 ; FAST_FLOAT *divisors |
| %define workspace ebp + 16 ; FAST_FLOAT *workspace |
| |
| align 32 |
| GLOBAL_FUNCTION(jsimd_quantize_float_sse2) |
| |
| EXTN(jsimd_quantize_float_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, DCTSIZE2/16 |
| alignx 16, 7 |
| .quantloop: |
| movaps xmm0, XMMWORD [XMMBLOCK(0,0,esi,SIZEOF_FAST_FLOAT)] |
| movaps xmm1, XMMWORD [XMMBLOCK(0,1,esi,SIZEOF_FAST_FLOAT)] |
| mulps xmm0, XMMWORD [XMMBLOCK(0,0,edx,SIZEOF_FAST_FLOAT)] |
| mulps xmm1, XMMWORD [XMMBLOCK(0,1,edx,SIZEOF_FAST_FLOAT)] |
| movaps xmm2, XMMWORD [XMMBLOCK(1,0,esi,SIZEOF_FAST_FLOAT)] |
| movaps xmm3, XMMWORD [XMMBLOCK(1,1,esi,SIZEOF_FAST_FLOAT)] |
| mulps xmm2, XMMWORD [XMMBLOCK(1,0,edx,SIZEOF_FAST_FLOAT)] |
| mulps xmm3, XMMWORD [XMMBLOCK(1,1,edx,SIZEOF_FAST_FLOAT)] |
| |
| cvtps2dq xmm0, xmm0 |
| cvtps2dq xmm1, xmm1 |
| cvtps2dq xmm2, xmm2 |
| cvtps2dq xmm3, xmm3 |
| |
| packssdw xmm0, xmm1 |
| packssdw xmm2, xmm3 |
| |
| movdqa XMMWORD [XMMBLOCK(0,0,edi,SIZEOF_JCOEF)], xmm0 |
| movdqa XMMWORD [XMMBLOCK(1,0,edi,SIZEOF_JCOEF)], xmm2 |
| |
| add esi, byte 16*SIZEOF_FAST_FLOAT |
| add edx, byte 16*SIZEOF_FAST_FLOAT |
| add edi, byte 16*SIZEOF_JCOEF |
| dec eax |
| jnz short .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 32 |
