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Use gcc/clang builtins for av_sat_(add|sub)_64_c if available.

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Signed-off-by: Dale Curtis <dalecurtis@chromium.org>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Dale Curtis 2020-05-01 10:20:43 -07:00 committed by Michael Niedermayer
parent 61c1df73d6
commit fda1c74539
2 changed files with 16 additions and 0 deletions
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6
libavutil/attributes.h
View File

@ -34,6 +34,12 @@
# define AV_GCC_VERSION_AT_MOST(x,y) 0
#endif
#ifdef __has_builtin
# define AV_HAS_BUILTIN(x) __has_builtin(x)
#else
# define AV_HAS_BUILTIN(x) false
#endif
#ifndef av_always_inline
#if AV_GCC_VERSION_AT_LEAST(3,1)
# define av_always_inline __attribute__((always_inline)) inline

10
libavutil/common.h
View File

@ -299,11 +299,16 @@ static av_always_inline int av_sat_dsub32_c(int a, int b)
* @return sum with signed saturation
*/
static av_always_inline int64_t av_sat_add64_c(int64_t a, int64_t b) {
#if (!defined(__INTEL_COMPILER) && AV_GCC_VERSION_AT_LEAST(5,1)) || AV_HAS_BUILTIN(__builtin_add_overflow)
int64_t tmp;
return !__builtin_add_overflow(a, b, &tmp) ? tmp : (tmp < 0 ? INT64_MAX : INT64_MIN);
#else
if (b >= 0 && a >= INT64_MAX - b)
return INT64_MAX;
if (b <= 0 && a <= INT64_MIN - b)
return INT64_MIN;
return a + b;
#endif
}
/**
@ -314,11 +319,16 @@ static av_always_inline int64_t av_sat_add64_c(int64_t a, int64_t b) {
* @return difference with signed saturation
*/
static av_always_inline int64_t av_sat_sub64_c(int64_t a, int64_t b) {
#if (!defined(__INTEL_COMPILER) && AV_GCC_VERSION_AT_LEAST(5,1)) || AV_HAS_BUILTIN(__builtin_sub_overflow)
int64_t tmp;
return !__builtin_sub_overflow(a, b, &tmp) ? tmp : (tmp < 0 ? INT64_MAX : INT64_MIN);
#else
if (b <= 0 && a >= INT64_MAX + b)
return INT64_MAX;
if (b >= 0 && a <= INT64_MIN + b)
return INT64_MIN;
return a - b;
#endif
}
/**