1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
|
;
; jquanti.asm - sample data conversion and quantization (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_sse2(JSAMPARRAY sample_data, JDIMENSION start_col,
; DCTELEM *workspace);
;
%define sample_data ebp + 8 ; JSAMPARRAY sample_data
%define start_col ebp + 12 ; JDIMENSION start_col
%define workspace ebp + 16 ; DCTELEM *workspace
align 32
GLOBAL_FUNCTION(jsimd_convsamp_sse2)
EXTN(jsimd_convsamp_sse2):
push ebp
mov ebp, esp
push ebx
; push ecx ; need not be preserved
; push edx ; need not be preserved
push esi
push edi
pxor xmm6, xmm6 ; xmm6=(all 0's)
pcmpeqw xmm7, xmm7
psllw xmm7, 7 ; xmm7={0xFF80 0xFF80 0xFF80 0xFF80 ..}
mov esi, JSAMPARRAY [sample_data] ; (JSAMPROW *)
mov eax, JDIMENSION [start_col]
mov edi, POINTER [workspace] ; (DCTELEM *)
mov ecx, DCTSIZE/4
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] ; xmm0=(01234567)
movq xmm1, XMM_MMWORD [edx+eax*SIZEOF_JSAMPLE] ; xmm1=(89ABCDEF)
mov ebx, JSAMPROW [esi+2*SIZEOF_JSAMPROW] ; (JSAMPLE *)
mov edx, JSAMPROW [esi+3*SIZEOF_JSAMPROW] ; (JSAMPLE *)
movq xmm2, XMM_MMWORD [ebx+eax*SIZEOF_JSAMPLE] ; xmm2=(GHIJKLMN)
movq xmm3, XMM_MMWORD [edx+eax*SIZEOF_JSAMPLE] ; xmm3=(OPQRSTUV)
punpcklbw xmm0, xmm6 ; xmm0=(01234567)
punpcklbw xmm1, xmm6 ; xmm1=(89ABCDEF)
paddw xmm0, xmm7
paddw xmm1, xmm7
punpcklbw xmm2, xmm6 ; xmm2=(GHIJKLMN)
punpcklbw xmm3, xmm6 ; xmm3=(OPQRSTUV)
paddw xmm2, xmm7
paddw xmm3, xmm7
movdqa XMMWORD [XMMBLOCK(0,0,edi,SIZEOF_DCTELEM)], xmm0
movdqa XMMWORD [XMMBLOCK(1,0,edi,SIZEOF_DCTELEM)], xmm1
movdqa XMMWORD [XMMBLOCK(2,0,edi,SIZEOF_DCTELEM)], xmm2
movdqa XMMWORD [XMMBLOCK(3,0,edi,SIZEOF_DCTELEM)], xmm3
add esi, byte 4*SIZEOF_JSAMPROW
add edi, byte 4*DCTSIZE*SIZEOF_DCTELEM
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
;
; This implementation is based on an algorithm described in
; "How to optimize for the Pentium family of microprocessors"
; (http://www.agner.org/assem/).
;
; GLOBAL(void)
; jsimd_quantize_sse2(JCOEFPTR coef_block, DCTELEM *divisors,
; DCTELEM *workspace);
;
%define RECIPROCAL(m, n, b) \
XMMBLOCK(DCTSIZE * 0 + (m), (n), (b), SIZEOF_DCTELEM)
%define CORRECTION(m, n, b) \
XMMBLOCK(DCTSIZE * 1 + (m), (n), (b), SIZEOF_DCTELEM)
%define SCALE(m, n, b) \
XMMBLOCK(DCTSIZE * 2 + (m), (n), (b), SIZEOF_DCTELEM)
%define coef_block ebp + 8 ; JCOEFPTR coef_block
%define divisors ebp + 12 ; DCTELEM *divisors
%define workspace ebp + 16 ; DCTELEM *workspace
align 32
GLOBAL_FUNCTION(jsimd_quantize_sse2)
EXTN(jsimd_quantize_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, DCTSIZE2/32
alignx 16, 7
.quantloop:
movdqa xmm4, XMMWORD [XMMBLOCK(0,0,esi,SIZEOF_DCTELEM)]
movdqa xmm5, XMMWORD [XMMBLOCK(1,0,esi,SIZEOF_DCTELEM)]
movdqa xmm6, XMMWORD [XMMBLOCK(2,0,esi,SIZEOF_DCTELEM)]
movdqa xmm7, XMMWORD [XMMBLOCK(3,0,esi,SIZEOF_DCTELEM)]
movdqa xmm0, xmm4
movdqa xmm1, xmm5
movdqa xmm2, xmm6
movdqa xmm3, xmm7
psraw xmm4, (WORD_BIT-1)
psraw xmm5, (WORD_BIT-1)
psraw xmm6, (WORD_BIT-1)
psraw xmm7, (WORD_BIT-1)
pxor xmm0, xmm4
pxor xmm1, xmm5
pxor xmm2, xmm6
pxor xmm3, xmm7
psubw xmm0, xmm4 ; if (xmm0 < 0) xmm0 = -xmm0;
psubw xmm1, xmm5 ; if (xmm1 < 0) xmm1 = -xmm1;
psubw xmm2, xmm6 ; if (xmm2 < 0) xmm2 = -xmm2;
psubw xmm3, xmm7 ; if (xmm3 < 0) xmm3 = -xmm3;
paddw xmm0, XMMWORD [CORRECTION(0,0,edx)] ; correction + roundfactor
paddw xmm1, XMMWORD [CORRECTION(1,0,edx)]
paddw xmm2, XMMWORD [CORRECTION(2,0,edx)]
paddw xmm3, XMMWORD [CORRECTION(3,0,edx)]
pmulhuw xmm0, XMMWORD [RECIPROCAL(0,0,edx)] ; reciprocal
pmulhuw xmm1, XMMWORD [RECIPROCAL(1,0,edx)]
pmulhuw xmm2, XMMWORD [RECIPROCAL(2,0,edx)]
pmulhuw xmm3, XMMWORD [RECIPROCAL(3,0,edx)]
pmulhuw xmm0, XMMWORD [SCALE(0,0,edx)] ; scale
pmulhuw xmm1, XMMWORD [SCALE(1,0,edx)]
pmulhuw xmm2, XMMWORD [SCALE(2,0,edx)]
pmulhuw xmm3, XMMWORD [SCALE(3,0,edx)]
pxor xmm0, xmm4
pxor xmm1, xmm5
pxor xmm2, xmm6
pxor xmm3, xmm7
psubw xmm0, xmm4
psubw xmm1, xmm5
psubw xmm2, xmm6
psubw xmm3, xmm7
movdqa XMMWORD [XMMBLOCK(0,0,edi,SIZEOF_DCTELEM)], xmm0
movdqa XMMWORD [XMMBLOCK(1,0,edi,SIZEOF_DCTELEM)], xmm1
movdqa XMMWORD [XMMBLOCK(2,0,edi,SIZEOF_DCTELEM)], xmm2
movdqa XMMWORD [XMMBLOCK(3,0,edi,SIZEOF_DCTELEM)], xmm3
add esi, byte 32*SIZEOF_DCTELEM
add edx, byte 32*SIZEOF_DCTELEM
add edi, byte 32*SIZEOF_JCOEF
dec eax
jnz near .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
|
