diff options
Diffstat (limited to 'sysdeps/libm-ieee754/s_isinff.c')
| -rw-r--r-- | sysdeps/libm-ieee754/s_isinff.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/sysdeps/libm-ieee754/s_isinff.c b/sysdeps/libm-ieee754/s_isinff.c index 1d81f15986..9acc0df6ec 100644 --- a/sysdeps/libm-ieee754/s_isinff.c +++ b/sysdeps/libm-ieee754/s_isinff.c @@ -8,7 +8,7 @@ static char rcsid[] = "$NetBSD: s_isinff.c,v 1.3 1995/05/11 23:20:21 jtc Exp $"; #endif /* - * isinff(x) returns 1 is x is inf, else 0; + * isinff(x) returns 1 if x is inf, -1 if x is -inf, else 0; * no branching! */ @@ -22,10 +22,11 @@ static char rcsid[] = "$NetBSD: s_isinff.c,v 1.3 1995/05/11 23:20:21 jtc Exp $"; float x; #endif { - int32_t ix; + int32_t ix,t; GET_FLOAT_WORD(ix,x); - ix &= 0x7fffffff; - ix ^= 0x7f800000; - return (ix == 0); + t = ix & 0x7fffffff; + t ^= 0x7f800000; + t |= -t; + return ~(t >> 31) & (1 - ((ix & 0x80000000) >> 30)); } weak_alias (__isinff, isinff) |