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optimize signbit macro
author
Rich Felker
<dalias@aerifal.cx>
Sat, 31 Mar 2012 03:41:43 +0000
(23:41 -0400)
committer
Rich Felker
<dalias@aerifal.cx>
Sat, 31 Mar 2012 03:41:43 +0000
(23:41 -0400)
include/math.h
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diff --git
a/include/math.h
b/include/math.h
index
8791bba
..
ff62cb7
100644
(file)
--- a/
include/math.h
+++ b/
include/math.h
@@
-77,8
+77,8
@@
int __signbitf(float);
int __signbitl(long double);
#define signbit(x) ( \
int __signbitl(long double);
#define signbit(x) ( \
- sizeof(x) == sizeof(float) ?
!!(__FLOAT_BITS(x) & 0x80000000
) : \
- sizeof(x) == sizeof(double) ?
!!(__DOUBLE_BITS(x) & (__uint64_t)1<<
63) : \
+ sizeof(x) == sizeof(float) ?
(int)(__FLOAT_BITS(x)>>31
) : \
+ sizeof(x) == sizeof(double) ?
(int)(__DOUBLE_BITS(x)>>
63) : \
__signbitl(x) )
#define isunordered(x,y) (isnan((x)) ? ((void)(y),1) : isnan((y)))
__signbitl(x) )
#define isunordered(x,y) (isnan((x)) ? ((void)(y),1) : isnan((y)))