2 ; jcqnts2i.asm - sample data conversion and quantization (SSE2)
4 ; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
7 ; 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
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
19 %include "jsimdext.inc"
22 ; --------------------------------------------------------------------------
26 ; Load data into workspace, applying unsigned->signed conversion
29 ; jsimd_convsamp_sse2 (JSAMPARRAY sample_data, JDIMENSION start_col,
30 ; DCTELEM * workspace);
33 %define sample_data ebp+8 ; JSAMPARRAY sample_data
34 %define start_col ebp+12 ; JDIMENSION start_col
35 %define workspace ebp+16 ; DCTELEM * workspace
38 global EXTN(jsimd_convsamp_sse2)
40 EXTN(jsimd_convsamp_sse2):
44 ; push ecx ; need not be preserved
45 ; push edx ; need not be preserved
49 pxor xmm6,xmm6 ; xmm6=(all 0's)
51 psllw xmm7,7 ; xmm7={0xFF80 0xFF80 0xFF80 0xFF80 ..}
53 mov esi, JSAMPARRAY [sample_data] ; (JSAMPROW *)
54 mov eax, JDIMENSION [start_col]
55 mov edi, POINTER [workspace] ; (DCTELEM *)
59 mov ebx, JSAMPROW [esi+0*SIZEOF_JSAMPROW] ; (JSAMPLE *)
60 mov edx, JSAMPROW [esi+1*SIZEOF_JSAMPROW] ; (JSAMPLE *)
62 movq xmm0, XMM_MMWORD [ebx+eax*SIZEOF_JSAMPLE] ; xmm0=(01234567)
63 movq xmm1, XMM_MMWORD [edx+eax*SIZEOF_JSAMPLE] ; xmm1=(89ABCDEF)
65 mov ebx, JSAMPROW [esi+2*SIZEOF_JSAMPROW] ; (JSAMPLE *)
66 mov edx, JSAMPROW [esi+3*SIZEOF_JSAMPROW] ; (JSAMPLE *)
68 movq xmm2, XMM_MMWORD [ebx+eax*SIZEOF_JSAMPLE] ; xmm2=(GHIJKLMN)
69 movq xmm3, XMM_MMWORD [edx+eax*SIZEOF_JSAMPLE] ; xmm3=(OPQRSTUV)
71 punpcklbw xmm0,xmm6 ; xmm0=(01234567)
72 punpcklbw xmm1,xmm6 ; xmm1=(89ABCDEF)
75 punpcklbw xmm2,xmm6 ; xmm2=(GHIJKLMN)
76 punpcklbw xmm3,xmm6 ; xmm3=(OPQRSTUV)
80 movdqa XMMWORD [XMMBLOCK(0,0,edi,SIZEOF_DCTELEM)], xmm0
81 movdqa XMMWORD [XMMBLOCK(1,0,edi,SIZEOF_DCTELEM)], xmm1
82 movdqa XMMWORD [XMMBLOCK(2,0,edi,SIZEOF_DCTELEM)], xmm2
83 movdqa XMMWORD [XMMBLOCK(3,0,edi,SIZEOF_DCTELEM)], xmm3
85 add esi, byte 4*SIZEOF_JSAMPROW
86 add edi, byte 4*DCTSIZE*SIZEOF_DCTELEM
92 ; pop edx ; need not be preserved
93 ; pop ecx ; need not be preserved
98 ; --------------------------------------------------------------------------
100 ; Quantize/descale the coefficients, and store into coef_block
102 ; This implementation is based on an algorithm described in
103 ; "How to optimize for the Pentium family of microprocessors"
104 ; (http://www.agner.org/assem/).
107 ; jsimd_quantize_sse2 (JCOEFPTR coef_block, DCTELEM * divisors,
108 ; DCTELEM * workspace);
111 %define RECIPROCAL(m,n,b) XMMBLOCK(DCTSIZE*0+(m),(n),(b),SIZEOF_DCTELEM)
112 %define CORRECTION(m,n,b) XMMBLOCK(DCTSIZE*1+(m),(n),(b),SIZEOF_DCTELEM)
113 %define SCALE(m,n,b) XMMBLOCK(DCTSIZE*2+(m),(n),(b),SIZEOF_DCTELEM)
115 %define coef_block ebp+8 ; JCOEFPTR coef_block
116 %define divisors ebp+12 ; DCTELEM * divisors
117 %define workspace ebp+16 ; DCTELEM * workspace
120 global EXTN(jsimd_quantize_sse2)
122 EXTN(jsimd_quantize_sse2):
127 ; push edx ; need not be preserved
131 mov esi, POINTER [workspace]
132 mov edx, POINTER [divisors]
133 mov edi, JCOEFPTR [coef_block]
137 movdqa xmm4, XMMWORD [XMMBLOCK(0,0,esi,SIZEOF_DCTELEM)]
138 movdqa xmm5, XMMWORD [XMMBLOCK(1,0,esi,SIZEOF_DCTELEM)]
139 movdqa xmm6, XMMWORD [XMMBLOCK(2,0,esi,SIZEOF_DCTELEM)]
140 movdqa xmm7, XMMWORD [XMMBLOCK(3,0,esi,SIZEOF_DCTELEM)]
145 psraw xmm4,(WORD_BIT-1)
146 psraw xmm5,(WORD_BIT-1)
147 psraw xmm6,(WORD_BIT-1)
148 psraw xmm7,(WORD_BIT-1)
153 psubw xmm0,xmm4 ; if (xmm0 < 0) xmm0 = -xmm0;
154 psubw xmm1,xmm5 ; if (xmm1 < 0) xmm1 = -xmm1;
155 psubw xmm2,xmm6 ; if (xmm2 < 0) xmm2 = -xmm2;
156 psubw xmm3,xmm7 ; if (xmm3 < 0) xmm3 = -xmm3;
158 paddw xmm0, XMMWORD [CORRECTION(0,0,edx)] ; correction + roundfactor
159 paddw xmm1, XMMWORD [CORRECTION(1,0,edx)]
160 paddw xmm2, XMMWORD [CORRECTION(2,0,edx)]
161 paddw xmm3, XMMWORD [CORRECTION(3,0,edx)]
162 pmulhuw xmm0, XMMWORD [RECIPROCAL(0,0,edx)] ; reciprocal
163 pmulhuw xmm1, XMMWORD [RECIPROCAL(1,0,edx)]
164 pmulhuw xmm2, XMMWORD [RECIPROCAL(2,0,edx)]
165 pmulhuw xmm3, XMMWORD [RECIPROCAL(3,0,edx)]
166 pmulhuw xmm0, XMMWORD [SCALE(0,0,edx)] ; scale
167 pmulhuw xmm1, XMMWORD [SCALE(1,0,edx)]
168 pmulhuw xmm2, XMMWORD [SCALE(2,0,edx)]
169 pmulhuw xmm3, XMMWORD [SCALE(3,0,edx)]
179 movdqa XMMWORD [XMMBLOCK(0,0,edi,SIZEOF_DCTELEM)], xmm0
180 movdqa XMMWORD [XMMBLOCK(1,0,edi,SIZEOF_DCTELEM)], xmm1
181 movdqa XMMWORD [XMMBLOCK(2,0,edi,SIZEOF_DCTELEM)], xmm2
182 movdqa XMMWORD [XMMBLOCK(3,0,edi,SIZEOF_DCTELEM)], xmm3
184 add esi, byte 32*SIZEOF_DCTELEM
185 add edx, byte 32*SIZEOF_DCTELEM
186 add edi, byte 32*SIZEOF_JCOEF
192 ; pop edx ; need not be preserved
198 ; For some reason, the OS X linker does not honor the request to align the
199 ; segment unless we do this.