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dsputil_x86.c
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1 /*
2  * Copyright (c) 2009 Loren Merritt <lorenm@u.washington.edu>
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include "config.h"
22 #include "libavutil/x86/asm.h"
23 #include "dsputil_x86.h"
24 
25 #if HAVE_INLINE_ASM
26 
27 #if HAVE_7REGS
29  const uint8_t *diff, int w,
30  int *left, int *left_top)
31 {
32  x86_reg w2 = -w;
33  x86_reg x;
34  int l = *left & 0xff;
35  int tl = *left_top & 0xff;
36  int t;
37  __asm__ volatile (
38  "mov %7, %3 \n"
39  "1: \n"
40  "movzbl (%3, %4), %2 \n"
41  "mov %2, %k3 \n"
42  "sub %b1, %b3 \n"
43  "add %b0, %b3 \n"
44  "mov %2, %1 \n"
45  "cmp %0, %2 \n"
46  "cmovg %0, %2 \n"
47  "cmovg %1, %0 \n"
48  "cmp %k3, %0 \n"
49  "cmovg %k3, %0 \n"
50  "mov %7, %3 \n"
51  "cmp %2, %0 \n"
52  "cmovl %2, %0 \n"
53  "add (%6, %4), %b0 \n"
54  "mov %b0, (%5, %4) \n"
55  "inc %4 \n"
56  "jl 1b \n"
57  : "+&q"(l), "+&q"(tl), "=&r"(t), "=&q"(x), "+&r"(w2)
58  : "r"(dst + w), "r"(diff + w), "rm"(top + w)
59  );
60  *left = l;
61  *left_top = tl;
62 }
63 #endif
64 
65 #endif /* HAVE_INLINE_ASM */