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- ;
- ; 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
- %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
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