diff options
Diffstat (limited to 'sysdeps/libm-ieee754/s_isinff.c')
| -rw-r--r-- | sysdeps/libm-ieee754/s_isinff.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/sysdeps/libm-ieee754/s_isinff.c b/sysdeps/libm-ieee754/s_isinff.c new file mode 100644 index 0000000000..1d81f15986 --- /dev/null +++ b/sysdeps/libm-ieee754/s_isinff.c @@ -0,0 +1,31 @@ +/* + * Written by J.T. Conklin <jtc@netbsd.org>. + * Public domain. + */ + +#if defined(LIBM_SCCS) && !defined(lint) +static char rcsid[] = "$NetBSD: s_isinff.c,v 1.3 1995/05/11 23:20:21 jtc Exp $"; +#endif + +/* + * isinff(x) returns 1 is x is inf, else 0; + * no branching! + */ + +#include "math.h" +#include "math_private.h" + +#ifdef __STDC__ + int __isinff(float x) +#else + int __isinff(x) + float x; +#endif +{ + int32_t ix; + GET_FLOAT_WORD(ix,x); + ix &= 0x7fffffff; + ix ^= 0x7f800000; + return (ix == 0); +} +weak_alias (__isinff, isinff) |