From 18daae313531ed597d0f6227d15af00b04b104c8 Mon Sep 17 00:00:00 2001 From: Szabolcs Nagy Date: Thu, 18 Sep 2014 17:02:24 +0200 Subject: math: fix exp10 not to raise invalid exception on NaN This was not caught earlier because gcc incorrectly generates quiet relational operators that never raise exceptions. --- src/math/exp10l.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) (limited to 'src/math/exp10l.c') diff --git a/src/math/exp10l.c b/src/math/exp10l.c index 4f9469ae..b758ebff 100644 --- a/src/math/exp10l.c +++ b/src/math/exp10l.c @@ -2,13 +2,14 @@ #include #include #include "libc.h" +#include "libm.h" #if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024 long double exp10l(long double x) { return exp10(x); } -#else +#elif (LDBL_MANT_DIG == 64 || LDBL_MANT_DIG == 113) && LDBL_MAX_EXP == 16384 long double exp10l(long double x) { static const long double p10[] = { @@ -18,7 +19,9 @@ long double exp10l(long double x) 1e10, 1e11, 1e12, 1e13, 1e14, 1e15 }; long double n, y = modfl(x, &n); - if (fabsl(n) < 16) { + union ldshape u = {n}; + /* fabsl(n) < 16 without raising invalid on nan */ + if ((u.i.se & 0x7fff) < 0x3fff+4) { if (!y) return p10[(int)n+15]; y = exp2l(3.32192809488736234787031942948939L * y); return y * p10[(int)n+15]; -- cgit v1.2.1