1; 2; jquantf.asm - sample data conversion and quantization (SSE & SSE2) 3; 4; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB 5; Copyright (C) 2016, D. R. Commander. 6; 7; Based on the x86 SIMD extension for IJG JPEG library 8; Copyright (C) 1999-2006, MIYASAKA Masaru. 9; For conditions of distribution and use, see copyright notice in jsimdext.inc 10; 11; This file should be assembled with NASM (Netwide Assembler), 12; can *not* be assembled with Microsoft's MASM or any compatible 13; assembler (including Borland's Turbo Assembler). 14; NASM is available from http://nasm.sourceforge.net/ or 15; http://sourceforge.net/project/showfiles.php?group_id=6208 16 17%include "jsimdext.inc" 18%include "jdct.inc" 19 20; -------------------------------------------------------------------------- 21 SECTION SEG_TEXT 22 BITS 32 23; 24; Load data into workspace, applying unsigned->signed conversion 25; 26; GLOBAL(void) 27; jsimd_convsamp_float_sse2(JSAMPARRAY sample_data, JDIMENSION start_col, 28; FAST_FLOAT *workspace); 29; 30 31%define sample_data ebp + 8 ; JSAMPARRAY sample_data 32%define start_col ebp + 12 ; JDIMENSION start_col 33%define workspace ebp + 16 ; FAST_FLOAT *workspace 34 35 align 32 36 GLOBAL_FUNCTION(jsimd_convsamp_float_sse2) 37 38EXTN(jsimd_convsamp_float_sse2): 39 push ebp 40 mov ebp, esp 41 push ebx 42; push ecx ; need not be preserved 43; push edx ; need not be preserved 44 push esi 45 push edi 46 47 pcmpeqw xmm7, xmm7 48 psllw xmm7, 7 49 packsswb xmm7, xmm7 ; xmm7 = PB_CENTERJSAMPLE (0x808080..) 50 51 mov esi, JSAMPARRAY [sample_data] ; (JSAMPROW *) 52 mov eax, JDIMENSION [start_col] 53 mov edi, POINTER [workspace] ; (DCTELEM *) 54 mov ecx, DCTSIZE/2 55 alignx 16, 7 56.convloop: 57 mov ebx, JSAMPROW [esi+0*SIZEOF_JSAMPROW] ; (JSAMPLE *) 58 mov edx, JSAMPROW [esi+1*SIZEOF_JSAMPROW] ; (JSAMPLE *) 59 60 movq xmm0, XMM_MMWORD [ebx+eax*SIZEOF_JSAMPLE] 61 movq xmm1, XMM_MMWORD [edx+eax*SIZEOF_JSAMPLE] 62 63 psubb xmm0, xmm7 ; xmm0=(01234567) 64 psubb xmm1, xmm7 ; xmm1=(89ABCDEF) 65 66 punpcklbw xmm0, xmm0 ; xmm0=(*0*1*2*3*4*5*6*7) 67 punpcklbw xmm1, xmm1 ; xmm1=(*8*9*A*B*C*D*E*F) 68 69 punpcklwd xmm2, xmm0 ; xmm2=(***0***1***2***3) 70 punpckhwd xmm0, xmm0 ; xmm0=(***4***5***6***7) 71 punpcklwd xmm3, xmm1 ; xmm3=(***8***9***A***B) 72 punpckhwd xmm1, xmm1 ; xmm1=(***C***D***E***F) 73 74 psrad xmm2, (DWORD_BIT-BYTE_BIT) ; xmm2=(0123) 75 psrad xmm0, (DWORD_BIT-BYTE_BIT) ; xmm0=(4567) 76 cvtdq2ps xmm2, xmm2 ; xmm2=(0123) 77 cvtdq2ps xmm0, xmm0 ; xmm0=(4567) 78 psrad xmm3, (DWORD_BIT-BYTE_BIT) ; xmm3=(89AB) 79 psrad xmm1, (DWORD_BIT-BYTE_BIT) ; xmm1=(CDEF) 80 cvtdq2ps xmm3, xmm3 ; xmm3=(89AB) 81 cvtdq2ps xmm1, xmm1 ; xmm1=(CDEF) 82 83 movaps XMMWORD [XMMBLOCK(0,0,edi,SIZEOF_FAST_FLOAT)], xmm2 84 movaps XMMWORD [XMMBLOCK(0,1,edi,SIZEOF_FAST_FLOAT)], xmm0 85 movaps XMMWORD [XMMBLOCK(1,0,edi,SIZEOF_FAST_FLOAT)], xmm3 86 movaps XMMWORD [XMMBLOCK(1,1,edi,SIZEOF_FAST_FLOAT)], xmm1 87 88 add esi, byte 2*SIZEOF_JSAMPROW 89 add edi, byte 2*DCTSIZE*SIZEOF_FAST_FLOAT 90 dec ecx 91 jnz short .convloop 92 93 pop edi 94 pop esi 95; pop edx ; need not be preserved 96; pop ecx ; need not be preserved 97 pop ebx 98 pop ebp 99 ret 100 101; -------------------------------------------------------------------------- 102; 103; Quantize/descale the coefficients, and store into coef_block 104; 105; GLOBAL(void) 106; jsimd_quantize_float_sse2(JCOEFPTR coef_block, FAST_FLOAT *divisors, 107; FAST_FLOAT *workspace); 108; 109 110%define coef_block ebp + 8 ; JCOEFPTR coef_block 111%define divisors ebp + 12 ; FAST_FLOAT *divisors 112%define workspace ebp + 16 ; FAST_FLOAT *workspace 113 114 align 32 115 GLOBAL_FUNCTION(jsimd_quantize_float_sse2) 116 117EXTN(jsimd_quantize_float_sse2): 118 push ebp 119 mov ebp, esp 120; push ebx ; unused 121; push ecx ; unused 122; push edx ; need not be preserved 123 push esi 124 push edi 125 126 mov esi, POINTER [workspace] 127 mov edx, POINTER [divisors] 128 mov edi, JCOEFPTR [coef_block] 129 mov eax, DCTSIZE2/16 130 alignx 16, 7 131.quantloop: 132 movaps xmm0, XMMWORD [XMMBLOCK(0,0,esi,SIZEOF_FAST_FLOAT)] 133 movaps xmm1, XMMWORD [XMMBLOCK(0,1,esi,SIZEOF_FAST_FLOAT)] 134 mulps xmm0, XMMWORD [XMMBLOCK(0,0,edx,SIZEOF_FAST_FLOAT)] 135 mulps xmm1, XMMWORD [XMMBLOCK(0,1,edx,SIZEOF_FAST_FLOAT)] 136 movaps xmm2, XMMWORD [XMMBLOCK(1,0,esi,SIZEOF_FAST_FLOAT)] 137 movaps xmm3, XMMWORD [XMMBLOCK(1,1,esi,SIZEOF_FAST_FLOAT)] 138 mulps xmm2, XMMWORD [XMMBLOCK(1,0,edx,SIZEOF_FAST_FLOAT)] 139 mulps xmm3, XMMWORD [XMMBLOCK(1,1,edx,SIZEOF_FAST_FLOAT)] 140 141 cvtps2dq xmm0, xmm0 142 cvtps2dq xmm1, xmm1 143 cvtps2dq xmm2, xmm2 144 cvtps2dq xmm3, xmm3 145 146 packssdw xmm0, xmm1 147 packssdw xmm2, xmm3 148 149 movdqa XMMWORD [XMMBLOCK(0,0,edi,SIZEOF_JCOEF)], xmm0 150 movdqa XMMWORD [XMMBLOCK(1,0,edi,SIZEOF_JCOEF)], xmm2 151 152 add esi, byte 16*SIZEOF_FAST_FLOAT 153 add edx, byte 16*SIZEOF_FAST_FLOAT 154 add edi, byte 16*SIZEOF_JCOEF 155 dec eax 156 jnz short .quantloop 157 158 pop edi 159 pop esi 160; pop edx ; need not be preserved 161; pop ecx ; unused 162; pop ebx ; unused 163 pop ebp 164 ret 165 166; For some reason, the OS X linker does not honor the request to align the 167; segment unless we do this. 168 align 32 169