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intmath.h
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1 /*
2  * Copyright (c) 2015 James Almer
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 #ifndef AVUTIL_X86_INTMATH_H
22 #define AVUTIL_X86_INTMATH_H
23 
24 #include <stdint.h>
25 #include <stdlib.h>
26 #if HAVE_FAST_CLZ
27 #if defined(_MSC_VER)
28 #include <intrin.h>
29 #elif defined(__INTEL_COMPILER)
30 #include <immintrin.h>
31 #endif
32 #endif
33 #include "config.h"
34 
35 #if HAVE_FAST_CLZ
36 #if (defined(__INTEL_COMPILER) && (__INTEL_COMPILER>=1216)) || defined(_MSC_VER)
37 # if defined(__INTEL_COMPILER)
38 # define ff_log2(x) (_bit_scan_reverse((x)|1))
39 # else
40 # define ff_log2 ff_log2_x86
41 static av_always_inline av_const int ff_log2_x86(unsigned int v)
42 {
43  unsigned long n;
44  _BitScanReverse(&n, v|1);
45  return n;
46 }
47 # endif
48 # define ff_log2_16bit av_log2
49 
50 #if defined(__INTEL_COMPILER) || (defined(_MSC_VER) && (_MSC_VER >= 1700))
51 # define ff_ctz(v) _tzcnt_u32(v)
52 
53 # if ARCH_X86_64
54 # define ff_ctzll(v) _tzcnt_u64(v)
55 # else
56 # define ff_ctzll ff_ctzll_x86
57 static av_always_inline av_const int ff_ctzll_x86(long long v)
58 {
59  return ((uint32_t)v == 0) ? _tzcnt_u32((uint32_t)(v >> 32)) + 32 : _tzcnt_u32((uint32_t)v);
60 }
61 # endif
62 #endif /* _MSC_VER */
63 
64 #endif /* __INTEL_COMPILER */
65 
66 #endif /* HAVE_FAST_CLZ */
67 
68 #if defined(__GNUC__)
69 
70 /* Our generic version of av_popcount is faster than GCC's built-in on
71  * CPUs that don't support the popcnt instruction.
72  */
73 #if defined(__POPCNT__)
74  #define av_popcount __builtin_popcount
75 #if ARCH_X86_64
76  #define av_popcount64 __builtin_popcountll
77 #endif
78 
79 #endif /* __POPCNT__ */
80 
81 #if defined(__BMI2__)
82 
83 #if AV_GCC_VERSION_AT_LEAST(5,1)
84 #define av_mod_uintp2 __builtin_ia32_bzhi_si
85 #elif HAVE_INLINE_ASM
86 /* GCC releases before 5.1.0 have a broken bzhi builtin, so for those we
87  * implement it using inline assembly
88  */
89 #define av_mod_uintp2 av_mod_uintp2_bmi2
90 static av_always_inline av_const unsigned av_mod_uintp2_bmi2(unsigned a, unsigned p)
91 {
92  if (av_builtin_constant_p(p))
93  return a & ((1 << p) - 1);
94  else {
95  unsigned x;
96  __asm__ ("bzhi %2, %1, %0 \n\t" : "=r"(x) : "rm"(a), "r"(p));
97  return x;
98  }
99 }
100 #endif /* AV_GCC_VERSION_AT_LEAST */
101 
102 #endif /* __BMI2__ */
103 
104 #if defined(__SSE2__) && !defined(__INTEL_COMPILER)
105 
106 #define av_clipd av_clipd_sse2
107 static av_always_inline av_const double av_clipd_sse2(double a, double amin, double amax)
108 {
109 #if defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
110  if (amin > amax) abort();
111 #endif
112  __asm__ ("minsd %2, %0 \n\t"
113  "maxsd %1, %0 \n\t"
114  : "+&x"(a) : "xm"(amin), "xm"(amax));
115  return a;
116 }
117 
118 #endif /* __SSE2__ */
119 
120 #if defined(__SSE__) && !defined(__INTEL_COMPILER)
121 
122 #define av_clipf av_clipf_sse
123 static av_always_inline av_const float av_clipf_sse(float a, float amin, float amax)
124 {
125 #if defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
126  if (amin > amax) abort();
127 #endif
128  __asm__ ("minss %2, %0 \n\t"
129  "maxss %1, %0 \n\t"
130  : "+&x"(a) : "xm"(amin), "xm"(amax));
131  return a;
132 }
133 
134 #endif /* __SSE__ */
135 
136 #endif /* __GNUC__ */
137 
138 #endif /* AVUTIL_X86_INTMATH_H */
#define av_const
Definition: attributes.h:76
int n
Definition: avisynth_c.h:547
#define av_builtin_constant_p
Definition: attributes.h:155
#define av_always_inline
Definition: attributes.h:39