Libav
svq1enc.c
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1 /*
2  * This file is part of Libav.
3  *
4  * Libav is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * Libav is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with Libav; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 #include "config.h"
20 #include "libavutil/attributes.h"
21 #include "libavutil/cpu.h"
22 #include "libavutil/x86/asm.h"
23 #include "libavutil/x86/cpu.h"
24 #include "libavcodec/svq1enc.h"
25 
26 #if HAVE_INLINE_ASM
27 
28 static int ssd_int8_vs_int16_mmx(const int8_t *pix1, const int16_t *pix2,
29  int size)
30 {
31  int sum;
32  x86_reg i = size;
33 
34  __asm__ volatile (
35  "pxor %%mm4, %%mm4 \n"
36  "1: \n"
37  "sub $8, %0 \n"
38  "movq (%2, %0), %%mm2 \n"
39  "movq (%3, %0, 2), %%mm0 \n"
40  "movq 8(%3, %0, 2), %%mm1 \n"
41  "punpckhbw %%mm2, %%mm3 \n"
42  "punpcklbw %%mm2, %%mm2 \n"
43  "psraw $8, %%mm3 \n"
44  "psraw $8, %%mm2 \n"
45  "psubw %%mm3, %%mm1 \n"
46  "psubw %%mm2, %%mm0 \n"
47  "pmaddwd %%mm1, %%mm1 \n"
48  "pmaddwd %%mm0, %%mm0 \n"
49  "paddd %%mm1, %%mm4 \n"
50  "paddd %%mm0, %%mm4 \n"
51  "jg 1b \n"
52  "movq %%mm4, %%mm3 \n"
53  "psrlq $32, %%mm3 \n"
54  "paddd %%mm3, %%mm4 \n"
55  "movd %%mm4, %1 \n"
56  : "+r" (i), "=r" (sum)
57  : "r" (pix1), "r" (pix2));
58 
59  return sum;
60 }
61 
62 #endif /* HAVE_INLINE_ASM */
63 
65 {
66 #if HAVE_INLINE_ASM
67  int cpu_flags = av_get_cpu_flags();
68 
69  if (INLINE_MMX(cpu_flags)) {
70  c->ssd_int8_vs_int16 = ssd_int8_vs_int16_mmx;
71  }
72 #endif /* HAVE_INLINE_ASM */
73 }
int size
int(* ssd_int8_vs_int16)(const int8_t *pix1, const int16_t *pix2, int size)
Definition: svq1enc.h:71
Macro definitions for various function/variable attributes.
#define av_cold
Definition: attributes.h:66
int x86_reg
Definition: asm.h:70
#define INLINE_MMX(flags)
Definition: cpu.h:63
av_cold void ff_svq1enc_init_x86(SVQ1EncContext *c)
Definition: svq1enc.c:64
int av_get_cpu_flags(void)
Return the flags which specify extensions supported by the CPU.
Definition: cpu.c:47