Fix missing used attribute for inline assembly variables
[ffmpeg.git] / libavcodec / x86 / lpc.c
1 /*
2  * SIMD-optimized LPC functions
3  * Copyright (c) 2007 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 02110-1301 USA
20  */
21
22 #include "libavutil/attributes.h"
23 #include "libavutil/cpu.h"
24 #include "libavutil/mem.h"
25 #include "libavutil/x86/asm.h"
26 #include "libavutil/x86/cpu.h"
27 #include "libavcodec/lpc.h"
28
29 DECLARE_ASM_CONST(16, double, pd_1)[2] = { 1.0, 1.0 };
30 DECLARE_ASM_CONST(16, double, pd_2)[2] = { 2.0, 2.0 };
31
32 #if HAVE_SSE2_INLINE
33
34 static void lpc_apply_welch_window_sse2(const int32_t *data, int len,
35                                         double *w_data)
36 {
37     double c = 2.0 / (len-1.0);
38     int n2 = len>>1;
39     x86_reg i = -n2*sizeof(int32_t);
40     x86_reg j =  n2*sizeof(int32_t);
41     __asm__ volatile(
42         "movsd   %4,     %%xmm7                \n\t"
43         "movapd  "MANGLE(pd_1)", %%xmm6        \n\t"
44         "movapd  "MANGLE(pd_2)", %%xmm5        \n\t"
45         "movlhps %%xmm7, %%xmm7                \n\t"
46         "subpd   %%xmm5, %%xmm7                \n\t"
47         "addsd   %%xmm6, %%xmm7                \n\t"
48         "test    $1,     %5                    \n\t"
49         "jz      2f                            \n\t"
50 #define WELCH(MOVPD, offset)\
51         "1:                                    \n\t"\
52         "movapd   %%xmm7,  %%xmm1              \n\t"\
53         "mulpd    %%xmm1,  %%xmm1              \n\t"\
54         "movapd   %%xmm6,  %%xmm0              \n\t"\
55         "subpd    %%xmm1,  %%xmm0              \n\t"\
56         "pshufd   $0x4e,   %%xmm0, %%xmm1      \n\t"\
57         "cvtpi2pd (%3,%0), %%xmm2              \n\t"\
58         "cvtpi2pd "#offset"*4(%3,%1), %%xmm3   \n\t"\
59         "mulpd    %%xmm0,  %%xmm2              \n\t"\
60         "mulpd    %%xmm1,  %%xmm3              \n\t"\
61         "movapd   %%xmm2, (%2,%0,2)            \n\t"\
62         MOVPD"    %%xmm3, "#offset"*8(%2,%1,2) \n\t"\
63         "subpd    %%xmm5,  %%xmm7              \n\t"\
64         "sub      $8,      %1                  \n\t"\
65         "add      $8,      %0                  \n\t"\
66         "jl 1b                                 \n\t"\
67
68         WELCH("movupd", -1)
69         "jmp 3f                                \n\t"
70         "2:                                    \n\t"
71         WELCH("movapd", -2)
72         "3:                                    \n\t"
73         :"+&r"(i), "+&r"(j)
74         :"r"(w_data+n2), "r"(data+n2), "m"(c), "r"(len)
75          NAMED_CONSTRAINTS_ARRAY_ADD(pd_1,pd_2)
76          XMM_CLOBBERS_ONLY("%xmm0", "%xmm1", "%xmm2", "%xmm3",
77                                     "%xmm5", "%xmm6", "%xmm7")
78     );
79 #undef WELCH
80 }
81
82 static void lpc_compute_autocorr_sse2(const double *data, int len, int lag,
83                                       double *autoc)
84 {
85     int j;
86
87     if((x86_reg)data & 15)
88         data++;
89
90     for(j=0; j<lag; j+=2){
91         x86_reg i = -len*sizeof(double);
92         if(j == lag-2) {
93             __asm__ volatile(
94                 "movsd    "MANGLE(pd_1)", %%xmm0    \n\t"
95                 "movsd    "MANGLE(pd_1)", %%xmm1    \n\t"
96                 "movsd    "MANGLE(pd_1)", %%xmm2    \n\t"
97                 "1:                                 \n\t"
98                 "movapd   (%2,%0), %%xmm3           \n\t"
99                 "movupd -8(%3,%0), %%xmm4           \n\t"
100                 "movapd   (%3,%0), %%xmm5           \n\t"
101                 "mulpd     %%xmm3, %%xmm4           \n\t"
102                 "mulpd     %%xmm3, %%xmm5           \n\t"
103                 "mulpd -16(%3,%0), %%xmm3           \n\t"
104                 "addpd     %%xmm4, %%xmm1           \n\t"
105                 "addpd     %%xmm5, %%xmm0           \n\t"
106                 "addpd     %%xmm3, %%xmm2           \n\t"
107                 "add       $16,    %0               \n\t"
108                 "jl 1b                              \n\t"
109                 "movhlps   %%xmm0, %%xmm3           \n\t"
110                 "movhlps   %%xmm1, %%xmm4           \n\t"
111                 "movhlps   %%xmm2, %%xmm5           \n\t"
112                 "addsd     %%xmm3, %%xmm0           \n\t"
113                 "addsd     %%xmm4, %%xmm1           \n\t"
114                 "addsd     %%xmm5, %%xmm2           \n\t"
115                 "movsd     %%xmm0,   (%1)           \n\t"
116                 "movsd     %%xmm1,  8(%1)           \n\t"
117                 "movsd     %%xmm2, 16(%1)           \n\t"
118                 :"+&r"(i)
119                 :"r"(autoc+j), "r"(data+len), "r"(data+len-j)
120                  NAMED_CONSTRAINTS_ARRAY_ADD(pd_1)
121                 :"memory"
122             );
123         } else {
124             __asm__ volatile(
125                 "movsd    "MANGLE(pd_1)", %%xmm0    \n\t"
126                 "movsd    "MANGLE(pd_1)", %%xmm1    \n\t"
127                 "1:                                 \n\t"
128                 "movapd   (%3,%0), %%xmm3           \n\t"
129                 "movupd -8(%4,%0), %%xmm4           \n\t"
130                 "mulpd     %%xmm3, %%xmm4           \n\t"
131                 "mulpd    (%4,%0), %%xmm3           \n\t"
132                 "addpd     %%xmm4, %%xmm1           \n\t"
133                 "addpd     %%xmm3, %%xmm0           \n\t"
134                 "add       $16,    %0               \n\t"
135                 "jl 1b                              \n\t"
136                 "movhlps   %%xmm0, %%xmm3           \n\t"
137                 "movhlps   %%xmm1, %%xmm4           \n\t"
138                 "addsd     %%xmm3, %%xmm0           \n\t"
139                 "addsd     %%xmm4, %%xmm1           \n\t"
140                 "movsd     %%xmm0, %1               \n\t"
141                 "movsd     %%xmm1, %2               \n\t"
142                 :"+&r"(i), "=m"(autoc[j]), "=m"(autoc[j+1])
143                 :"r"(data+len), "r"(data+len-j)
144                  NAMED_CONSTRAINTS_ARRAY_ADD(pd_1)
145             );
146         }
147     }
148 }
149
150 #endif /* HAVE_SSE2_INLINE */
151
152 av_cold void ff_lpc_init_x86(LPCContext *c)
153 {
154 #if HAVE_SSE2_INLINE
155     int cpu_flags = av_get_cpu_flags();
156
157     if (INLINE_SSE2(cpu_flags) || INLINE_SSE2_SLOW(cpu_flags)) {
158         c->lpc_apply_welch_window = lpc_apply_welch_window_sse2;
159         c->lpc_compute_autocorr   = lpc_compute_autocorr_sse2;
160     }
161 #endif /* HAVE_SSE2_INLINE */
162 }