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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_ctanhf.c
parentca48a46a03da4b64e623ac300929dd137f41adc6 (diff)
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Fix ctan, ctanh of subnormals in round-upwards mode (bug 14328).
Diffstat (limited to 'math/s_ctanhf.c')
-rw-r--r--math/s_ctanhf.c18
1 files changed, 15 insertions, 3 deletions
diff --git a/math/s_ctanhf.c b/math/s_ctanhf.c
index e505155774..ca36a83bfb 100644
--- a/math/s_ctanhf.c
+++ b/math/s_ctanhf.c
@@ -83,10 +83,22 @@ __ctanhf (__complex__ float x)
 	}
       else
 	{
-	  float sinhrx = __ieee754_sinhf (__real__ x);
-	  float coshrx = __ieee754_coshf (__real__ x);
+	  float sinhrx, coshrx;
+	  if (fabsf (__real__ x) > FLT_MIN)
+	    {
+	      sinhrx = __ieee754_sinhf (__real__ x);
+	      coshrx = __ieee754_coshf (__real__ x);
+	    }
+	  else
+	    {
+	      sinhrx = __real__ x;
+	      coshrx = 1.0f;
+	    }
 
-	  den = sinhrx * sinhrx + cosix * cosix;
+	  if (fabsf (sinhrx) > fabsf (cosix) * FLT_EPSILON)
+	    den = sinhrx * sinhrx + cosix * cosix;
+	  else
+	    den = cosix * cosix;
 	  __real__ res = sinhrx * coshrx / den;
 	  __imag__ res = sinix * cosix / den;
 	}