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authorSzabolcs Nagy <nsz@port70.net>2014-09-18 17:02:24 +0200
committerSzabolcs Nagy <nsz@port70.net>2014-09-18 17:52:50 +0200
commit18daae313531ed597d0f6227d15af00b04b104c8 (patch)
tree9e4ccc417560cdad1bec3e7933855977139cd8fd /src/math/exp10l.c
parente2e1bb81485a37321d928a8d8b63f40b9d8fa228 (diff)
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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.
Diffstat (limited to 'src/math/exp10l.c')
-rw-r--r--src/math/exp10l.c7
1 files changed, 5 insertions, 2 deletions
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 <float.h>
 #include <math.h>
 #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];