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
|
;
; jcqnts2i.asm - sample data conversion and quantization (64-bit SSE2)
;
; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
; Copyright 2009 D. R. Commander
;
; Based on
; 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
;
; [TAB8]
%include "jsimdext.inc"
%include "jdct.inc"
; --------------------------------------------------------------------------
SECTION SEG_TEXT
BITS 64
;
; Load data into workspace, applying unsigned->signed conversion
;
; GLOBAL(void)
; jsimd_convsamp_sse2 (JSAMPARRAY sample_data, JDIMENSION start_col,
; DCTELEM * workspace);
;
; r10 = JSAMPARRAY sample_data
; r11 = JDIMENSION start_col
; r12 = DCTELEM * workspace
align 16
global EXTN(jsimd_convsamp_sse2)
EXTN(jsimd_convsamp_sse2):
push rbp
mov rbp,rsp
push rbx
collect_args
pxor xmm6,xmm6 ; xmm6=(all 0's)
pcmpeqw xmm7,xmm7
psllw xmm7,7 ; xmm7={0xFF80 0xFF80 0xFF80 0xFF80 ..}
mov rsi, r10
mov rax, r11
mov rdi, r12
mov rcx, DCTSIZE/4
.convloop:
mov rbx, JSAMPROW [rsi+0*SIZEOF_JSAMPROW] ; (JSAMPLE *)
mov rdx, JSAMPROW [rsi+1*SIZEOF_JSAMPROW] ; (JSAMPLE *)
movq xmm0, XMM_MMWORD [rbx+rax*SIZEOF_JSAMPLE] ; xmm0=(01234567)
movq xmm1, XMM_MMWORD [rdx+rax*SIZEOF_JSAMPLE] ; xmm1=(89ABCDEF)
mov rbx, JSAMPROW [rsi+2*SIZEOF_JSAMPROW] ; (JSAMPLE *)
mov rdx, JSAMPROW [rsi+3*SIZEOF_JSAMPROW] ; (JSAMPLE *)
movq xmm2, XMM_MMWORD [rbx+rax*SIZEOF_JSAMPLE] ; xmm2=(GHIJKLMN)
movq xmm3, XMM_MMWORD [rdx+rax*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,rdi,SIZEOF_DCTELEM)], xmm0
movdqa XMMWORD [XMMBLOCK(1,0,rdi,SIZEOF_DCTELEM)], xmm1
movdqa XMMWORD [XMMBLOCK(2,0,rdi,SIZEOF_DCTELEM)], xmm2
movdqa XMMWORD [XMMBLOCK(3,0,rdi,SIZEOF_DCTELEM)], xmm3
add rsi, byte 4*SIZEOF_JSAMPROW
add rdi, byte 4*DCTSIZE*SIZEOF_DCTELEM
dec rcx
jnz short .convloop
uncollect_args
pop rbx
pop rbp
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)
; r10 = JCOEFPTR coef_block
; r11 = DCTELEM * divisors
; r12 = DCTELEM * workspace
align 16
global EXTN(jsimd_quantize_sse2)
EXTN(jsimd_quantize_sse2):
push rbp
mov rbp,rsp
collect_args
mov rsi, r12
mov rdx, r11
mov rdi, r10
mov rax, DCTSIZE2/32
.quantloop:
movdqa xmm4, XMMWORD [XMMBLOCK(0,0,rsi,SIZEOF_DCTELEM)]
movdqa xmm5, XMMWORD [XMMBLOCK(1,0,rsi,SIZEOF_DCTELEM)]
movdqa xmm6, XMMWORD [XMMBLOCK(2,0,rsi,SIZEOF_DCTELEM)]
movdqa xmm7, XMMWORD [XMMBLOCK(3,0,rsi,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,rdx)] ; correction + roundfactor
paddw xmm1, XMMWORD [CORRECTION(1,0,rdx)]
paddw xmm2, XMMWORD [CORRECTION(2,0,rdx)]
paddw xmm3, XMMWORD [CORRECTION(3,0,rdx)]
pmulhuw xmm0, XMMWORD [RECIPROCAL(0,0,rdx)] ; reciprocal
pmulhuw xmm1, XMMWORD [RECIPROCAL(1,0,rdx)]
pmulhuw xmm2, XMMWORD [RECIPROCAL(2,0,rdx)]
pmulhuw xmm3, XMMWORD [RECIPROCAL(3,0,rdx)]
pmulhuw xmm0, XMMWORD [SCALE(0,0,rdx)] ; scale
pmulhuw xmm1, XMMWORD [SCALE(1,0,rdx)]
pmulhuw xmm2, XMMWORD [SCALE(2,0,rdx)]
pmulhuw xmm3, XMMWORD [SCALE(3,0,rdx)]
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,rdi,SIZEOF_DCTELEM)], xmm0
movdqa XMMWORD [XMMBLOCK(1,0,rdi,SIZEOF_DCTELEM)], xmm1
movdqa XMMWORD [XMMBLOCK(2,0,rdi,SIZEOF_DCTELEM)], xmm2
movdqa XMMWORD [XMMBLOCK(3,0,rdi,SIZEOF_DCTELEM)], xmm3
add rsi, byte 32*SIZEOF_DCTELEM
add rdx, byte 32*SIZEOF_DCTELEM
add rdi, byte 32*SIZEOF_JCOEF
dec rax
jnz near .quantloop
uncollect_args
pop rbp
ret
; For some reason, the OS X linker does not honor the request to align the
; segment unless we do this.
align 16
|
