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Use C99-defined signbit macro

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Nobuyoshi Nakada 2021-08-27 12:42:23 +09:00
parent 04be8e84db
commit 80c1faf076
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Notes: git 2021-08-27 15:41:06 +09:00
5 changed files with 1 additions and 43 deletions
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19
missing/signbit.c
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@ -1,19 +0,0 @@
#include <limits.h>
#include "ruby.h"
int
signbit(double x)
{
enum {double_per_long = sizeof(double) / sizeof(long)};
enum {long_msb = sizeof(long) * CHAR_BIT - 1};
union {double d; unsigned long i[double_per_long];} u;
unsigned long l;
u.d = x;
#ifdef WORDS_BIGENDIAN
l = u.i[0];
#else
l = u.i[double_per_long - 1];
#endif
return (int)(l >> long_msb);
}