ffmpeg / libavcodec / x86 / fft_3dn2.c @ a6493a8f
History  View  Annotate  Download (5.1 KB)
1 
/*


2 
* FFT/MDCT transform with Extended 3DNow! optimizations

3 
* Copyright (c) 20062008 Zuxy MENG Jie, Loren Merritt

4 
*

5 
* This file is part of FFmpeg.

6 
*

7 
* FFmpeg is free software; you can redistribute it and/or

8 
* modify it under the terms of the GNU Lesser General Public

9 
* License as published by the Free Software Foundation; either

10 
* version 2.1 of the License, or (at your option) any later version.

11 
*

12 
* FFmpeg is distributed in the hope that it will be useful,

13 
* but WITHOUT ANY WARRANTY; without even the implied warranty of

14 
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

15 
* Lesser General Public License for more details.

16 
*

17 
* You should have received a copy of the GNU Lesser General Public

18 
* License along with FFmpeg; if not, write to the Free Software

19 
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 021101301 USA

20 
*/

21  
22 
#include "libavutil/x86_cpu.h" 
23 
#include "libavcodec/dsputil.h" 
24  
25 
DECLARE_ALIGNED_8(static const int, m1m1[2]) = { 1<<31, 1<<31 }; 
26  
27 
#ifdef EMULATE_3DNOWEXT

28 
#define PSWAPD(s,d)\

29 
"movq "#s","#d"\n"\ 
30 
"psrlq $32,"#d"\n"\ 
31 
"punpckldq "#s","#d"\n" 
32 
#define ff_fft_calc_3dn2 ff_fft_calc_3dn

33 
#define ff_fft_dispatch_3dn2 ff_fft_dispatch_3dn

34 
#define ff_fft_dispatch_interleave_3dn2 ff_fft_dispatch_interleave_3dn

35 
#define ff_imdct_calc_3dn2 ff_imdct_calc_3dn

36 
#define ff_imdct_half_3dn2 ff_imdct_half_3dn

37 
#else

38 
#define PSWAPD(s,d) "pswapd "#s","#d"\n" 
39 
#endif

40  
41 
void ff_fft_dispatch_3dn2(FFTComplex *z, int nbits); 
42 
void ff_fft_dispatch_interleave_3dn2(FFTComplex *z, int nbits); 
43  
44 
void ff_fft_calc_3dn2(FFTContext *s, FFTComplex *z)

45 
{ 
46 
int n = 1<<s>nbits; 
47 
int i;

48 
ff_fft_dispatch_interleave_3dn2(z, s>nbits); 
49 
__asm__ volatile("femms"); 
50 
if(n <= 8) 
51 
for(i=0; i<n; i+=2) 
52 
FFSWAP(FFTSample, z[i].im, z[i+1].re);

53 
} 
54  
55 
void ff_imdct_half_3dn2(MDCTContext *s, FFTSample *output, const FFTSample *input) 
56 
{ 
57 
x86_reg j, k; 
58 
long n = 1 << s>nbits; 
59 
long n2 = n >> 1; 
60 
long n4 = n >> 2; 
61 
long n8 = n >> 3; 
62 
const uint16_t *revtab = s>fft.revtab;

63 
const FFTSample *tcos = s>tcos;

64 
const FFTSample *tsin = s>tsin;

65 
const FFTSample *in1, *in2;

66 
FFTComplex *z = (FFTComplex *)output; 
67  
68 
/* pre rotation */

69 
in1 = input; 
70 
in2 = input + n2  1;

71 
#ifdef EMULATE_3DNOWEXT

72 
__asm__ volatile("movd %0, %%mm7" ::"r"(1<<31)); 
73 
#endif

74 
for(k = 0; k < n4; k++) { 
75 
// FIXME a single block is faster, but gcc 2.95 and 3.4.x on 32bit can't compile it

76 
__asm__ volatile(

77 
"movd %0, %%mm0 \n"

78 
"movd %2, %%mm1 \n"

79 
"punpckldq %1, %%mm0 \n"

80 
"punpckldq %3, %%mm1 \n"

81 
"movq %%mm0, %%mm2 \n"

82 
PSWAPD( %%mm1, %%mm3 ) 
83 
"pfmul %%mm1, %%mm0 \n"

84 
"pfmul %%mm3, %%mm2 \n"

85 
#ifdef EMULATE_3DNOWEXT

86 
"movq %%mm0, %%mm1 \n"

87 
"punpckhdq %%mm2, %%mm0 \n"

88 
"punpckldq %%mm2, %%mm1 \n"

89 
"pxor %%mm7, %%mm0 \n"

90 
"pfadd %%mm1, %%mm0 \n"

91 
#else

92 
"pfpnacc %%mm2, %%mm0 \n"

93 
#endif

94 
::"m"(in2[2*k]), "m"(in1[2*k]), 
95 
"m"(tcos[k]), "m"(tsin[k]) 
96 
); 
97 
__asm__ volatile(

98 
"movq %%mm0, %0 \n\t"

99 
:"=m"(z[revtab[k]])

100 
); 
101 
} 
102  
103 
ff_fft_dispatch_3dn2(z, s>fft.nbits); 
104  
105 
#define CMUL(j,mm0,mm1)\

106 
"movq (%2,"#j",2), %%mm6 \n"\ 
107 
"movq 8(%2,"#j",2), "#mm0"\n"\ 
108 
"movq %%mm6, "#mm1"\n"\ 
109 
"movq "#mm0",%%mm7 \n"\ 
110 
"pfmul (%3,"#j"), %%mm6 \n"\ 
111 
"pfmul (%4,"#j"), "#mm0"\n"\ 
112 
"pfmul (%4,"#j"), "#mm1"\n"\ 
113 
"pfmul (%3,"#j"), %%mm7 \n"\ 
114 
"pfsub %%mm6, "#mm0"\n"\ 
115 
"pfadd %%mm7, "#mm1"\n" 
116  
117 
/* post rotation */

118 
j = n2; 
119 
k = n28;

120 
__asm__ volatile(

121 
"1: \n"

122 
CMUL(%0, %%mm0, %%mm1)

123 
CMUL(%1, %%mm2, %%mm3)

124 
"movd %%mm0, (%2,%0,2) \n"

125 
"movd %%mm1,12(%2,%1,2) \n"

126 
"movd %%mm2, (%2,%1,2) \n"

127 
"movd %%mm3,12(%2,%0,2) \n"

128 
"psrlq $32, %%mm0 \n"

129 
"psrlq $32, %%mm1 \n"

130 
"psrlq $32, %%mm2 \n"

131 
"psrlq $32, %%mm3 \n"

132 
"movd %%mm0, 8(%2,%0,2) \n"

133 
"movd %%mm1, 4(%2,%1,2) \n"

134 
"movd %%mm2, 8(%2,%1,2) \n"

135 
"movd %%mm3, 4(%2,%0,2) \n"

136 
"sub $8, %1 \n"

137 
"add $8, %0 \n"

138 
"jl 1b \n"

139 
:"+r"(j), "+r"(k) 
140 
:"r"(z+n8), "r"(tcos+n8), "r"(tsin+n8) 
141 
:"memory"

142 
); 
143 
__asm__ volatile("femms"); 
144 
} 
145  
146 
void ff_imdct_calc_3dn2(MDCTContext *s, FFTSample *output, const FFTSample *input) 
147 
{ 
148 
x86_reg j, k; 
149 
long n = 1 << s>nbits; 
150 
long n4 = n >> 2; 
151  
152 
ff_imdct_half_3dn2(s, output+n4, input); 
153  
154 
j = n; 
155 
k = n8;

156 
__asm__ volatile(

157 
"movq %4, %%mm7 \n"

158 
"1: \n"

159 
PSWAPD((%2,%1), %%mm0) 
160 
PSWAPD((%3,%0), %%mm1) 
161 
"pxor %%mm7, %%mm0 \n"

162 
"movq %%mm1, (%3,%1) \n"

163 
"movq %%mm0, (%2,%0) \n"

164 
"sub $8, %1 \n"

165 
"add $8, %0 \n"

166 
"jl 1b \n"

167 
:"+r"(j), "+r"(k) 
168 
:"r"(output+n4), "r"(output+n4*3), 
169 
"m"(*m1m1)

170 
); 
171 
__asm__ volatile("femms"); 
172 
} 
173 