зеркало из https://github.com/mozilla/pjs.git
172 строки
4.8 KiB
NASM
172 строки
4.8 KiB
NASM
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; jcqnts2f.asm - sample data conversion and quantization (SSE & SSE2)
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;
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; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
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;
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; Based on
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; x86 SIMD extension for IJG JPEG library
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; Copyright (C) 1999-2006, MIYASAKA Masaru.
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; For conditions of distribution and use, see copyright notice in jsimdext.inc
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;
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; This file should be assembled with NASM (Netwide Assembler),
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; can *not* be assembled with Microsoft's MASM or any compatible
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; assembler (including Borland's Turbo Assembler).
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; NASM is available from http://nasm.sourceforge.net/ or
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; http://sourceforge.net/project/showfiles.php?group_id=6208
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;
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; [TAB8]
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%include "jsimdext.inc"
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%include "jdct.inc"
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; --------------------------------------------------------------------------
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SECTION SEG_TEXT
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BITS 32
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;
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; Load data into workspace, applying unsigned->signed conversion
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;
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; GLOBAL(void)
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; jsimd_convsamp_float_sse2 (JSAMPARRAY sample_data, JDIMENSION start_col,
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; FAST_FLOAT * workspace);
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;
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%define sample_data ebp+8 ; JSAMPARRAY sample_data
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%define start_col ebp+12 ; JDIMENSION start_col
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%define workspace ebp+16 ; FAST_FLOAT * workspace
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align 16
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global EXTN(jsimd_convsamp_float_sse2)
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EXTN(jsimd_convsamp_float_sse2):
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push ebp
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mov ebp,esp
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push ebx
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; push ecx ; need not be preserved
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; push edx ; need not be preserved
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push esi
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push edi
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pcmpeqw xmm7,xmm7
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psllw xmm7,7
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packsswb xmm7,xmm7 ; xmm7 = PB_CENTERJSAMPLE (0x808080..)
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mov esi, JSAMPARRAY [sample_data] ; (JSAMPROW *)
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mov eax, JDIMENSION [start_col]
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mov edi, POINTER [workspace] ; (DCTELEM *)
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mov ecx, DCTSIZE/2
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alignx 16,7
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.convloop:
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mov ebx, JSAMPROW [esi+0*SIZEOF_JSAMPROW] ; (JSAMPLE *)
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mov edx, JSAMPROW [esi+1*SIZEOF_JSAMPROW] ; (JSAMPLE *)
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movq xmm0, XMM_MMWORD [ebx+eax*SIZEOF_JSAMPLE]
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movq xmm1, XMM_MMWORD [edx+eax*SIZEOF_JSAMPLE]
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psubb xmm0,xmm7 ; xmm0=(01234567)
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psubb xmm1,xmm7 ; xmm1=(89ABCDEF)
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punpcklbw xmm0,xmm0 ; xmm0=(*0*1*2*3*4*5*6*7)
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punpcklbw xmm1,xmm1 ; xmm1=(*8*9*A*B*C*D*E*F)
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punpcklwd xmm2,xmm0 ; xmm2=(***0***1***2***3)
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punpckhwd xmm0,xmm0 ; xmm0=(***4***5***6***7)
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punpcklwd xmm3,xmm1 ; xmm3=(***8***9***A***B)
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punpckhwd xmm1,xmm1 ; xmm1=(***C***D***E***F)
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psrad xmm2,(DWORD_BIT-BYTE_BIT) ; xmm2=(0123)
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psrad xmm0,(DWORD_BIT-BYTE_BIT) ; xmm0=(4567)
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cvtdq2ps xmm2,xmm2 ; xmm2=(0123)
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cvtdq2ps xmm0,xmm0 ; xmm0=(4567)
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psrad xmm3,(DWORD_BIT-BYTE_BIT) ; xmm3=(89AB)
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psrad xmm1,(DWORD_BIT-BYTE_BIT) ; xmm1=(CDEF)
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cvtdq2ps xmm3,xmm3 ; xmm3=(89AB)
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cvtdq2ps xmm1,xmm1 ; xmm1=(CDEF)
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movaps XMMWORD [XMMBLOCK(0,0,edi,SIZEOF_FAST_FLOAT)], xmm2
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movaps XMMWORD [XMMBLOCK(0,1,edi,SIZEOF_FAST_FLOAT)], xmm0
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movaps XMMWORD [XMMBLOCK(1,0,edi,SIZEOF_FAST_FLOAT)], xmm3
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movaps XMMWORD [XMMBLOCK(1,1,edi,SIZEOF_FAST_FLOAT)], xmm1
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add esi, byte 2*SIZEOF_JSAMPROW
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add edi, byte 2*DCTSIZE*SIZEOF_FAST_FLOAT
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dec ecx
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jnz short .convloop
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pop edi
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pop esi
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; pop edx ; need not be preserved
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; pop ecx ; need not be preserved
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pop ebx
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pop ebp
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ret
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; --------------------------------------------------------------------------
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;
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; Quantize/descale the coefficients, and store into coef_block
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;
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; GLOBAL(void)
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; jsimd_quantize_float_sse2 (JCOEFPTR coef_block, FAST_FLOAT * divisors,
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; FAST_FLOAT * workspace);
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;
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%define coef_block ebp+8 ; JCOEFPTR coef_block
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%define divisors ebp+12 ; FAST_FLOAT * divisors
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%define workspace ebp+16 ; FAST_FLOAT * workspace
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align 16
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global EXTN(jsimd_quantize_float_sse2)
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EXTN(jsimd_quantize_float_sse2):
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push ebp
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mov ebp,esp
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; push ebx ; unused
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; push ecx ; unused
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; push edx ; need not be preserved
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push esi
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push edi
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mov esi, POINTER [workspace]
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mov edx, POINTER [divisors]
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mov edi, JCOEFPTR [coef_block]
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mov eax, DCTSIZE2/16
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alignx 16,7
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.quantloop:
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movaps xmm0, XMMWORD [XMMBLOCK(0,0,esi,SIZEOF_FAST_FLOAT)]
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movaps xmm1, XMMWORD [XMMBLOCK(0,1,esi,SIZEOF_FAST_FLOAT)]
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mulps xmm0, XMMWORD [XMMBLOCK(0,0,edx,SIZEOF_FAST_FLOAT)]
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mulps xmm1, XMMWORD [XMMBLOCK(0,1,edx,SIZEOF_FAST_FLOAT)]
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movaps xmm2, XMMWORD [XMMBLOCK(1,0,esi,SIZEOF_FAST_FLOAT)]
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movaps xmm3, XMMWORD [XMMBLOCK(1,1,esi,SIZEOF_FAST_FLOAT)]
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mulps xmm2, XMMWORD [XMMBLOCK(1,0,edx,SIZEOF_FAST_FLOAT)]
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mulps xmm3, XMMWORD [XMMBLOCK(1,1,edx,SIZEOF_FAST_FLOAT)]
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cvtps2dq xmm0,xmm0
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cvtps2dq xmm1,xmm1
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cvtps2dq xmm2,xmm2
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cvtps2dq xmm3,xmm3
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packssdw xmm0,xmm1
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packssdw xmm2,xmm3
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movdqa XMMWORD [XMMBLOCK(0,0,edi,SIZEOF_JCOEF)], xmm0
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movdqa XMMWORD [XMMBLOCK(1,0,edi,SIZEOF_JCOEF)], xmm2
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add esi, byte 16*SIZEOF_FAST_FLOAT
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add edx, byte 16*SIZEOF_FAST_FLOAT
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add edi, byte 16*SIZEOF_JCOEF
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dec eax
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jnz short .quantloop
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pop edi
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pop esi
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; pop edx ; need not be preserved
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; pop ecx ; unused
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; pop ebx ; unused
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pop ebp
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ret
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; For some reason, the OS X linker does not honor the request to align the
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; segment unless we do this.
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align 16
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