diff options
Diffstat (limited to 'libm/s_isinff.c')
| -rw-r--r-- | libm/s_isinff.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/libm/s_isinff.c b/libm/s_isinff.c new file mode 100644 index 000000000..33e274947 --- /dev/null +++ b/libm/s_isinff.c @@ -0,0 +1,30 @@ +/* + * 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 if x is inf, -1 if x is -inf, else 0; + * no branching! + */ + +#include "math.h" +#include "math_private.h" + +libm_hidden_proto(__isinff) +int +__isinff (float x) +{ + int32_t ix,t; + GET_FLOAT_WORD(ix,x); + t = ix & 0x7fffffff; + t ^= 0x7f800000; + t |= -t; + return ~(t >> 31) & (ix >> 30); +} +libm_hidden_def (__isinff) +weak_alias (__isinff, isinff) |