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authorSzabolcs Nagy <nsz@port70.net>2013-09-02 23:35:46 +0000
committerSzabolcs Nagy <nsz@port70.net>2013-09-05 11:30:07 +0000
commit98be442ee8a2b8b7e0802b604e384d5a2c43282e (patch)
treefe20ecbce7be9e457fd678a4e4cea6b0fe32e692 /src/math/logb.c
parent4cec31fc23b28271a2ed0b290e65699dffac3fee (diff)
downloadmusl-98be442ee8a2b8b7e0802b604e384d5a2c43282e.tar.gz
math: fix logb(-0.0) in downward rounding mode
use -1/(x*x) instead of -1/(x+0) to return -inf, -0+0 is -0 in downward rounding mode
Diffstat (limited to 'src/math/logb.c')
-rw-r--r--src/math/logb.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/math/logb.c b/src/math/logb.c
index 624425a8..7f8bdfae 100644
--- a/src/math/logb.c
+++ b/src/math/logb.c
@@ -1,4 +1,4 @@
-#include "libm.h"
+#include <math.h>
/*
special cases:
@@ -12,6 +12,6 @@ double logb(double x)
if (!isfinite(x))
return x * x;
if (x == 0)
- return -1/(x+0);
+ return -1/(x*x);
return ilogb(x);
}