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configure: Check for the math function rint 

Add a fallback implementation if it doesn't exist.

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Ronald S. Bultje 2012-06-26 15:05:28 +03:00 committed by Martin Storsjö
parent 781888da89
commit 183b1c2268
2 changed files with 9 additions and 0 deletions
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2
configure vendored
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@ -1124,6 +1124,7 @@ HAVE_LIST="
poll_h
posix_memalign
rdtsc
rint
round
roundf
rweflags
@ -2954,6 +2955,7 @@ check_mathfunc log2
check_mathfunc log2f
check_mathfunc lrint
check_mathfunc lrintf
check_mathfunc rint
check_mathfunc round
check_mathfunc roundf
check_mathfunc trunc

7
libavutil/libm.h
View File

@ -86,6 +86,13 @@ static av_always_inline av_const int isnan(float x)
#define log2f(x) ((float)log2(x))
#endif /* HAVE_LOG2F */
#if !HAVE_RINT
static inline double rint(double x)
{
return x >= 0 ? floor(x + 0.5) : ceil(x - 0.5);
}
#endif /* HAVE_RINT */
#if !HAVE_LRINT
static av_always_inline av_const long int lrint(double x)
{