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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 (HAVE_SSE2_INLINE && cpu_flags & (AV_CPU_FLAG_SSE2 | AV_CPU_FLAG_SSE2SLOW)) { | |
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 | } |