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authorJoseph Myers <joseph@codesourcery.com>2016-06-06 22:21:11 +0000
committerJoseph Myers <joseph@codesourcery.com>2016-06-06 22:21:11 +0000
commit3d8b06bc6108aa20a6591f52e7d9cbbd63c20e0a (patch)
tree4d39272f31ecc39b6e42fa8179a4b1c8591502c2 /sysdeps/ieee754
parentaf5fdf5a358329161cc3960f5e54fac16dbb8063 (diff)
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Fix dbl-64 asin (sNaN) (bug 20213).
The dbl-64 version of asin returns sNaN for sNaN arguments.  This
patch fixes it to add NaN arguments to themselves so that qNaN is
returned in this case.

Tested for x86_64 and x86.

	[BZ #20213]
	* sysdeps/ieee754/dbl-64/e_asin.c (__ieee754_asin): Add NaN
	argument to itself.
	* math/libm-test.inc (asin_test_data): Add sNaN tests.
Diffstat (limited to 'sysdeps/ieee754')
-rw-r--r--sysdeps/ieee754/dbl-64/e_asin.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/sysdeps/ieee754/dbl-64/e_asin.c b/sysdeps/ieee754/dbl-64/e_asin.c
index 5d5fb01132..23e9e7eddd 100644
--- a/sysdeps/ieee754/dbl-64/e_asin.c
+++ b/sysdeps/ieee754/dbl-64/e_asin.c
@@ -323,7 +323,7 @@ __ieee754_asin(double x){
   /*---------------------------- |x|>=1 -------------------------------*/
   else if (k==0x3ff00000 && u.i[LOW_HALF]==0) return (m>0)?hp0.x:-hp0.x;
   else
-  if (k>0x7ff00000 || (k == 0x7ff00000 && u.i[LOW_HALF] != 0)) return x;
+  if (k>0x7ff00000 || (k == 0x7ff00000 && u.i[LOW_HALF] != 0)) return x + x;
   else {
     u.i[HIGH_HALF]=0x7ff00000;
     v.i[HIGH_HALF]=0x7ff00000;