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authorJoseph Myers <joseph@codesourcery.com>2013-04-26 19:26:22 +0000
committerJoseph Myers <joseph@codesourcery.com>2013-04-26 19:26:22 +0000
commit9457fd952cafc701375fc9fae575a4aca1374de3 (patch)
tree0116832c92205eb0c42197ce9c269a7f52d09c5e /math/s_catan.c
parentf0302940e7c2acb587971e3c99dfbd00aa4e2134 (diff)
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Fix catan, catanh missing underflows (bug 15406).
Diffstat (limited to 'math/s_catan.c')
-rw-r--r--math/s_catan.c13
1 files changed, 12 insertions, 1 deletions
diff --git a/math/s_catan.c b/math/s_catan.c
index 783941a..6a1016e 100644
--- a/math/s_catan.c
+++ b/math/s_catan.c
@@ -20,7 +20,7 @@
#include <complex.h>
#include <math.h>
#include <math_private.h>
-
+#include <float.h>
__complex__ double
__catan (__complex__ double x)
@@ -83,6 +83,17 @@ __catan (__complex__ double x)
num = 4.0 * __imag__ x;
__imag__ res = 0.25 * __log1p (num / den);
}
+
+ if (fabs (__real__ res) < DBL_MIN)
+ {
+ volatile double force_underflow = __real__ res * __real__ res;
+ (void) force_underflow;
+ }
+ if (fabs (__imag__ res) < DBL_MIN)
+ {
+ volatile double force_underflow = __imag__ res * __imag__ res;
+ (void) force_underflow;
+ }
}
return res;