ARM: make FASTDIV() an inline function
[libav.git] / libavutil / internal.h
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1/*
2 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
3 *
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4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
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7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
b78e7197 9 * version 2.1 of the License, or (at your option) any later version.
04d7f601 10 *
b78e7197 11 * FFmpeg is distributed in the hope that it will be useful,
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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
b78e7197 17 * License along with FFmpeg; if not, write to the Free Software
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18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
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21/**
22 * @file internal.h
23 * common internal api header.
24 */
25
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26#ifndef AVUTIL_INTERNAL_H
27#define AVUTIL_INTERNAL_H
05020c89 28
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29#if !defined(DEBUG) && !defined(NDEBUG)
30# define NDEBUG
31#endif
32
99545457 33#include <stdint.h>
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34#include <stddef.h>
35#include <assert.h>
99545457 36
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37#ifndef attribute_align_arg
38#if defined(__GNUC__) && (__GNUC__ > 4 || __GNUC__ == 4 && __GNUC_MINOR__>1)
39# define attribute_align_arg __attribute__((force_align_arg_pointer))
40#else
41# define attribute_align_arg
42#endif
43#endif
44
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45#ifndef attribute_used
46#if defined(__GNUC__) && (__GNUC__ > 3 || __GNUC__ == 3 && __GNUC_MINOR__ > 0)
47# define attribute_used __attribute__((used))
48#else
49# define attribute_used
50#endif
51#endif
52
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53#ifndef INT16_MIN
54#define INT16_MIN (-0x7fff-1)
55#endif
56
57#ifndef INT16_MAX
58#define INT16_MAX 0x7fff
59#endif
60
61#ifndef INT32_MIN
62#define INT32_MIN (-0x7fffffff-1)
63#endif
64
65#ifndef INT32_MAX
66#define INT32_MAX 0x7fffffff
67#endif
68
69#ifndef UINT32_MAX
70#define UINT32_MAX 0xffffffff
71#endif
72
73#ifndef INT64_MIN
74#define INT64_MIN (-0x7fffffffffffffffLL-1)
75#endif
76
77#ifndef INT64_MAX
8da9266c 78#define INT64_MAX INT64_C(9223372036854775807)
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79#endif
80
81#ifndef UINT64_MAX
8da9266c 82#define UINT64_MAX UINT64_C(0xFFFFFFFFFFFFFFFF)
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83#endif
84
85#ifndef INT_BIT
86# if INT_MAX != 2147483647
87# define INT_BIT 64
88# else
89# define INT_BIT 32
90# endif
91#endif
92
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93#if ( defined(__PIC__) || defined(__pic__) ) && ! defined(PIC)
94# define PIC
95#endif
96
a087028a 97#include "config.h"
cf1e119b 98#include "intreadwrite.h"
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99#include "bswap.h"
100
05020c89 101#ifndef offsetof
635eb0cc 102# define offsetof(T,F) ((unsigned int)((char *)&((T *)0)->F))
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103#endif
104
05020c89 105// Use rip-relative addressing if compiling PIC code on x86-64.
b4d96ba2 106#if defined(ARCH_X86_64) && defined(PIC)
df22c35d 107# define LOCAL_MANGLE(a) #a "(%%rip)"
edfd6975 108#else
df22c35d 109# define LOCAL_MANGLE(a) #a
635eb0cc 110#endif
05020c89 111
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112#define MANGLE(a) EXTERN_PREFIX LOCAL_MANGLE(a)
113
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114/* debug stuff */
115
05020c89 116/* dprintf macros */
635eb0cc 117#ifdef DEBUG
318c5e05 118# define dprintf(pctx, ...) av_log(pctx, AV_LOG_DEBUG, __VA_ARGS__)
635eb0cc 119#else
318c5e05 120# define dprintf(pctx, ...)
635eb0cc 121#endif
05020c89 122
635eb0cc 123#define av_abort() do { av_log(NULL, AV_LOG_ERROR, "Abort at %s:%d\n", __FILE__, __LINE__); abort(); } while (0)
05020c89 124
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125/* math */
126
36cd3069 127extern const uint32_t ff_inverse[256];
05020c89 128
3cd52279 129#if defined(ARCH_X86)
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130# define FASTDIV(a,b) \
131 ({\
132 int ret,dmy;\
be449fca 133 __asm__ volatile(\
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134 "mull %3"\
135 :"=d"(ret),"=a"(dmy)\
36cd3069 136 :"1"(a),"g"(ff_inverse[b])\
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137 );\
138 ret;\
139 })
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140#elif defined(HAVE_ARMV6)
141static inline av_const int FASTDIV(int a, int b)
142{
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143 int r, t;
144 __asm__ volatile("cmp %3, #2 \n\t"
145 "ldr %1, [%4, %3, lsl #2] \n\t"
146 "lsrle %0, %2, #1 \n\t"
147 "smmulgt %0, %1, %2 \n\t"
148 : "=&r"(r), "=&r"(t) : "r"(a), "r"(b), "r"(ff_inverse));
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149 return r;
150}
a2fc0f6a 151#elif defined(ARCH_ARM)
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152static inline av_const int FASTDIV(int a, int b)
153{
154 int r, t;
155 __asm__ volatile ("umull %1, %0, %2, %3"
156 : "=&r"(r), "=&r"(t) : "r"(a), "r"(ff_inverse[b]));
157 return r;
158}
05020c89 159#elif defined(CONFIG_FASTDIV)
36cd3069 160# define FASTDIV(a,b) ((uint32_t)((((uint64_t)a)*ff_inverse[b])>>32))
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161#else
162# define FASTDIV(a,b) ((a)/(b))
163#endif
164
c448a096 165extern const uint8_t ff_sqrt_tab[256];
05020c89 166
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167static inline int av_log2_16bit(unsigned int v);
168
85074d3c 169static inline av_const unsigned int ff_sqrt(unsigned int a)
05020c89 170{
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171 unsigned int b;
172
173 if(a<255) return (ff_sqrt_tab[a+1]-1)>>4;
174 else if(a<(1<<12)) b= ff_sqrt_tab[a>>4 ]>>2;
175#ifndef CONFIG_SMALL
176 else if(a<(1<<14)) b= ff_sqrt_tab[a>>6 ]>>1;
177 else if(a<(1<<16)) b= ff_sqrt_tab[a>>8 ] ;
178#endif
179 else{
180 int s= av_log2_16bit(a>>16)>>1;
181 unsigned int c= a>>(s+2);
182 b= ff_sqrt_tab[c>>(s+8)];
183 b= FASTDIV(c,b) + (b<<s);
05020c89 184 }
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185
186 return b - (a<b*b);
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187}
188
3cd52279 189#if defined(ARCH_X86)
05020c89 190#define MASK_ABS(mask, level)\
be449fca 191 __asm__ volatile(\
7e14b808 192 "cltd \n\t"\
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193 "xorl %1, %0 \n\t"\
194 "subl %1, %0 \n\t"\
195 : "+a" (level), "=&d" (mask)\
196 );
197#else
198#define MASK_ABS(mask, level)\
199 mask= level>>31;\
200 level= (level^mask)-mask;
201#endif
202
94e4c3a3 203#ifdef HAVE_CMOV
05020c89 204#define COPY3_IF_LT(x,y,a,b,c,d)\
be449fca 205__asm__ volatile (\
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206 "cmpl %0, %3 \n\t"\
207 "cmovl %3, %0 \n\t"\
208 "cmovl %4, %1 \n\t"\
209 "cmovl %5, %2 \n\t"\
8c2e2040 210 : "+&r" (x), "+&r" (a), "+r" (c)\
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211 : "r" (y), "r" (b), "r" (d)\
212);
213#else
214#define COPY3_IF_LT(x,y,a,b,c,d)\
215if((y)<(x)){\
216 (x)=(y);\
217 (a)=(b);\
218 (c)=(d);\
219}
220#endif
221
222/* avoid usage of various functions */
84662c01 223#undef malloc
05020c89 224#define malloc please_use_av_malloc
84662c01 225#undef free
05020c89 226#define free please_use_av_free
84662c01 227#undef realloc
05020c89 228#define realloc please_use_av_realloc
84662c01 229#undef time
05020c89 230#define time time_is_forbidden_due_to_security_issues
84662c01 231#undef rand
3299fb45 232#define rand rand_is_forbidden_due_to_state_trashing_use_av_random
84662c01 233#undef srand
3299fb45 234#define srand srand_is_forbidden_due_to_state_trashing_use_av_init_random
84662c01 235#undef random
3299fb45 236#define random random_is_forbidden_due_to_state_trashing_use_av_random
84662c01 237#undef sprintf
05020c89 238#define sprintf sprintf_is_forbidden_due_to_security_issues_use_snprintf
84662c01 239#undef strcat
272605c7 240#define strcat strcat_is_forbidden_due_to_security_issues_use_av_strlcat
84662c01 241#undef exit
c367d067 242#define exit exit_is_forbidden
6123abad 243#ifndef LIBAVFORMAT_BUILD
84662c01 244#undef printf
05020c89 245#define printf please_use_av_log
84662c01 246#undef fprintf
05020c89 247#define fprintf please_use_av_log
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248#undef puts
249#define puts please_use_av_log
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250#undef perror
251#define perror please_use_av_log_instead_of_perror
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252#endif
253
254#define CHECKED_ALLOCZ(p, size)\
255{\
256 p= av_mallocz(size);\
257 if(p==NULL && (size)!=0){\
7f0cd6a5 258 av_log(NULL, AV_LOG_ERROR, "Cannot allocate memory.");\
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259 goto fail;\
260 }\
261}
262
a33cab3a 263#ifndef HAVE_LLRINT
85074d3c 264static av_always_inline av_const long long llrint(double x)
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265{
266 return rint(x);
267}
268#endif /* HAVE_LLRINT */
269
270#ifndef HAVE_LRINT
85074d3c 271static av_always_inline av_const long int lrint(double x)
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272{
273 return rint(x);
274}
275#endif /* HAVE_LRINT */
276
05020c89 277#ifndef HAVE_LRINTF
85074d3c 278static av_always_inline av_const long int lrintf(float x)
05020c89 279{
05020c89 280 return (int)(rint(x));
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281}
282#endif /* HAVE_LRINTF */
283
a33cab3a 284#ifndef HAVE_ROUND
85074d3c 285static av_always_inline av_const double round(double x)
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286{
287 return (x > 0) ? floor(x + 0.5) : ceil(x - 0.5);
288}
289#endif /* HAVE_ROUND */
290
291#ifndef HAVE_ROUNDF
85074d3c 292static av_always_inline av_const float roundf(float x)
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293{
294 return (x > 0) ? floor(x + 0.5) : ceil(x - 0.5);
295}
296#endif /* HAVE_ROUNDF */
297
98790382 298#endif /* AVUTIL_INTERNAL_H */