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Add a log2 replacement for systems that haven't quite caught up with the C99

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standard library.

Originally committed as revision 19395 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Alex Converse
2009-07-10 19:20:06 +00:00
parent 451ae25724
commit 291fd18a6e
2 changed files with 9 additions and 1 deletions
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3
configure vendored
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@@ -911,6 +911,7 @@ HAVE_LIST="
libdc1394_1 libdc1394_1
libdc1394_2 libdc1394_2
llrint llrint
log2
loongson loongson
lrint lrint
lrintf lrintf
@@ -2078,7 +2079,7 @@ check_lib math.h sin -lm
check_lib va/va.h vaInitialize -lva check_lib va/va.h vaInitialize -lva
# test for C99 functions in math.h # test for C99 functions in math.h
for func in llrint lrint lrintf round roundf truncf; do for func in llrint log2 lrint lrintf round roundf truncf; do
check_exec <<EOF && enable $func || disable $func check_exec <<EOF && enable $func || disable $func
#include <math.h> #include <math.h>
int main(void) { return ($func(3.999f) > 0)?0:1; } int main(void) { return ($func(3.999f) > 0)?0:1; }

7
libavutil/internal.h
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@@ -265,6 +265,13 @@ static av_always_inline av_const long long llrint(double x)
} }
#endif /* HAVE_LLRINT */ #endif /* HAVE_LLRINT */
#if !HAVE_LOG2
static av_always_inline av_const double log2(double x)
{
return log(x) * 1.44269504088896340736;
}
#endif /* HAVE_LOG2 */
#if !HAVE_LRINT #if !HAVE_LRINT
static av_always_inline av_const long int lrint(double x) static av_always_inline av_const long int lrint(double x)
{ {