123f7258a8
The IJG convention is to format copyright notices as: Copyright (C) YYYY, Owner. We try to maintain this convention for any code that is part of the libjpeg API library (with the exception of preserving the copyright notices from Cendio's code verbatim, since those predate libjpeg-turbo.) Note that the phrase "All Rights Reserved" is no longer necessary, since all Buenos Aires Convention signatories signed onto the Berne Convention in 2000. However, our convention is to retain this phrase for any files that have a self-contained copyright header but to leave it off of any files that refer to another file for conditions of distribution and use. For instance, all of the non-SIMD files in the libjpeg API library refer to README.ijg, and the copyright message in that file contains "All Rights Reserved", so it is unnecessary to add it to the individual files. The TurboJPEG code retains my preferred formatting convention for copyright notices, which is based on that of VirtualGL (where the TurboJPEG API originated.)
171 lines
6.1 KiB
NASM
171 lines
6.1 KiB
NASM
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; jquantf.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 the 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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