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mathops.h
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1 /*
2  * simple math operations
3  * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> et al
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 #ifndef AVCODEC_X86_MATHOPS_H
23 #define AVCODEC_X86_MATHOPS_H
24 
25 #include "config.h"
26 
27 #include "libavutil/common.h"
28 #include "libavutil/x86/asm.h"
29 
30 #if HAVE_INLINE_ASM
31 
32 #if ARCH_X86_32
33 
34 #define MULL MULL
35 static av_always_inline av_const int MULL(int a, int b, unsigned shift)
36 {
37  int rt, dummy;
38  __asm__ (
39  "imull %3 \n\t"
40  "shrdl %4, %%edx, %%eax \n\t"
41  :"=a"(rt), "=d"(dummy)
42  :"a"(a), "rm"(b), "ci"((uint8_t)shift)
43  );
44  return rt;
45 }
46 
47 #define MULH MULH
48 static av_always_inline av_const int MULH(int a, int b)
49 {
50  int rt, dummy;
51  __asm__ (
52  "imull %3"
53  :"=d"(rt), "=a"(dummy)
54  :"a"(a), "rm"(b)
55  );
56  return rt;
57 }
58 
59 #define MUL64 MUL64
60 static av_always_inline av_const int64_t MUL64(int a, int b)
61 {
62  int64_t rt;
63  __asm__ (
64  "imull %2"
65  :"=A"(rt)
66  :"a"(a), "rm"(b)
67  );
68  return rt;
69 }
70 
71 #endif /* ARCH_X86_32 */
72 
73 #if HAVE_I686
74 /* median of 3 */
75 #define mid_pred mid_pred
76 static inline av_const int mid_pred(int a, int b, int c)
77 {
78  int i=b;
79  __asm__ (
80  "cmp %2, %1 \n\t"
81  "cmovg %1, %0 \n\t"
82  "cmovg %2, %1 \n\t"
83  "cmp %3, %1 \n\t"
84  "cmovl %3, %1 \n\t"
85  "cmp %1, %0 \n\t"
86  "cmovg %1, %0 \n\t"
87  :"+&r"(i), "+&r"(a)
88  :"r"(b), "r"(c)
89  );
90  return i;
91 }
92 
93 #if HAVE_6REGS
94 #define COPY3_IF_LT(x, y, a, b, c, d)\
95 __asm__ volatile(\
96  "cmpl %0, %3 \n\t"\
97  "cmovl %3, %0 \n\t"\
98  "cmovl %4, %1 \n\t"\
99  "cmovl %5, %2 \n\t"\
100  : "+&r" (x), "+&r" (a), "+r" (c)\
101  : "r" (y), "r" (b), "r" (d)\
102 );
103 #endif /* HAVE_6REGS */
104 
105 #endif /* HAVE_I686 */
106 
107 #define MASK_ABS(mask, level) \
108  __asm__ ("cdq \n\t" \
109  "xorl %1, %0 \n\t" \
110  "subl %1, %0 \n\t" \
111  : "+a"(level), "=&d"(mask))
112 
113 // avoid +32 for shift optimization (gcc should do that ...)
114 #define NEG_SSR32 NEG_SSR32
115 static inline int32_t NEG_SSR32( int32_t a, int8_t s){
116  __asm__ ("sarl %1, %0\n\t"
117  : "+r" (a)
118  : "ic" ((uint8_t)(-s))
119  );
120  return a;
121 }
122 
123 #define NEG_USR32 NEG_USR32
124 static inline uint32_t NEG_USR32(uint32_t a, int8_t s){
125  __asm__ ("shrl %1, %0\n\t"
126  : "+r" (a)
127  : "ic" ((uint8_t)(-s))
128  );
129  return a;
130 }
131 
132 #endif /* HAVE_INLINE_ASM */
133 #endif /* AVCODEC_X86_MATHOPS_H */
#define MUL64(a, b)
Definition: mathops.h:54
#define av_const
Definition: attributes.h:76
static int shift(int a, int b)
Definition: sonic.c:82
const char * b
Definition: vf_curves.c:113
uint8_t
#define NEG_SSR32(a, s)
Definition: mathops.h:162
#define NEG_USR32(a, s)
Definition: mathops.h:166
int32_t
#define s(width, name)
Definition: cbs_vp9.c:257
int dummy
Definition: motion.c:64
#define mid_pred
Definition: mathops.h:97
common internal and external API header
static double c[64]
#define MULL(a, b, s)
Definition: mathops.h:58
#define av_always_inline
Definition: attributes.h:39
#define MULH
Definition: mathops.h:42