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
|
/*
* FFT/IFFT transforms
* AltiVec-enabled
* Copyright (c) 2009 Loren Merritt
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavcodec/fft.h"
#include "util_altivec.h"
#include "types_altivec.h"
#include "regs.h"
/**
* Do a complex FFT with the parameters defined in ff_fft_init(). The
* input data must be permuted before with s->revtab table. No
* 1.0/sqrt(n) normalization is done.
* AltiVec-enabled
* This code assumes that the 'z' pointer is 16 bytes-aligned
* It also assumes all FFTComplex are 8 bytes-aligned pair of float
*/
// Pointers to functions. Not using function pointer syntax, because
// that involves an extra level of indirection on some PPC ABIs.
extern void *ff_fft_dispatch_altivec[2][15];
// Convert from simd order to C order.
static void swizzle(vec_f *z, int n)
{
int i;
n >>= 1;
for (i = 0; i < n; i += 2) {
vec_f re = z[i];
vec_f im = z[i+1];
z[i] = vec_mergeh(re, im);
z[i+1] = vec_mergel(re, im);
}
}
static void ff_fft_calc_altivec(FFTContext *s, FFTComplex *z)
{
register vec_f v14 __asm__("v14") = {0,0,0,0};
register vec_f v15 __asm__("v15") = *(const vec_f*)ff_cos_16;
register vec_f v16 __asm__("v16") = {0, 0.38268343, M_SQRT1_2, 0.92387953};
register vec_f v17 __asm__("v17") = {-M_SQRT1_2, M_SQRT1_2, M_SQRT1_2,-M_SQRT1_2};
register vec_f v18 __asm__("v18") = { M_SQRT1_2, M_SQRT1_2, M_SQRT1_2, M_SQRT1_2};
register vec_u8 v19 __asm__("v19") = vcprm(s0,3,2,1);
register vec_u8 v20 __asm__("v20") = vcprm(0,1,s2,s1);
register vec_u8 v21 __asm__("v21") = vcprm(2,3,s0,s3);
register vec_u8 v22 __asm__("v22") = vcprm(2,s3,3,s2);
register vec_u8 v23 __asm__("v23") = vcprm(0,1,s0,s1);
register vec_u8 v24 __asm__("v24") = vcprm(2,3,s2,s3);
register vec_u8 v25 __asm__("v25") = vcprm(2,3,0,1);
register vec_u8 v26 __asm__("v26") = vcprm(1,2,s3,s0);
register vec_u8 v27 __asm__("v27") = vcprm(0,3,s2,s1);
register vec_u8 v28 __asm__("v28") = vcprm(0,2,s1,s3);
register vec_u8 v29 __asm__("v29") = vcprm(1,3,s0,s2);
register FFTSample *const*cos_tabs __asm__("r12") = ff_cos_tabs;
register FFTComplex *zarg __asm__("r3") = z;
__asm__(
"mtctr %0 \n"
"li "r(9)", 16 \n"
"subi "r(1)","r(1) ",%1 \n"
"bctrl \n"
"addi "r(1)","r(1) ",%1 \n"
::"r"(ff_fft_dispatch_altivec[1][s->nbits-2]), "i"(12*sizeof(void*)),
"r"(zarg), "r"(cos_tabs),
"v"(v14),"v"(v15),"v"(v16),"v"(v17),"v"(v18),"v"(v19),"v"(v20),"v"(v21),
"v"(v22),"v"(v23),"v"(v24),"v"(v25),"v"(v26),"v"(v27),"v"(v28),"v"(v29)
: "lr","ctr","r0","r4","r5","r6","r7","r8","r9","r10","r11",
"v0","v1","v2","v3","v4","v5","v6","v7","v8","v9","v10","v11","v12","v13"
);
if (s->nbits <= 4)
swizzle((vec_f*)z, 1<<s->nbits);
}
av_cold void ff_fft_init_altivec(FFTContext *s)
{
if (HAVE_GNU_AS)
s->fft_calc = ff_fft_calc_altivec;
}
|
