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authorJoseph Myers <joseph@codesourcery.com>2012-07-04 09:55:26 +0000
committerJoseph Myers <joseph@codesourcery.com>2012-07-04 09:55:26 +0000
commitca61cf32d934eda9130c4d3c6911892877ad7b0d (patch)
tree46022718d233a6b0ca7f2ba1d2d99d0356430aae /math/s_ctanh.c
parentca48a46a03da4b64e623ac300929dd137f41adc6 (diff)
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Fix ctan, ctanh of subnormals in round-upwards mode (bug 14328).
Diffstat (limited to 'math/s_ctanh.c')
-rw-r--r--math/s_ctanh.c18
1 files changed, 15 insertions, 3 deletions
diff --git a/math/s_ctanh.c b/math/s_ctanh.c
index 201871e..d288b7d 100644
--- a/math/s_ctanh.c
+++ b/math/s_ctanh.c
@@ -83,10 +83,22 @@ __ctanh (__complex__ double x)
}
else
{
- double sinhrx = __ieee754_sinh (__real__ x);
- double coshrx = __ieee754_cosh (__real__ x);
+ double sinhrx, coshrx;
+ if (fabs (__real__ x) > DBL_MIN)
+ {
+ sinhrx = __ieee754_sinh (__real__ x);
+ coshrx = __ieee754_cosh (__real__ x);
+ }
+ else
+ {
+ sinhrx = __real__ x;
+ coshrx = 1.0;
+ }
- den = sinhrx * sinhrx + cosix * cosix;
+ if (fabs (sinhrx) > fabs (cosix) * DBL_EPSILON)
+ den = sinhrx * sinhrx + cosix * cosix;
+ else
+ den = cosix * cosix;
__real__ res = sinhrx * coshrx / den;
__imag__ res = sinix * cosix / den;
}