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authorJoseph Myers <joseph@codesourcery.com>2016-06-08 22:24:06 +0000
committerJoseph Myers <joseph@codesourcery.com>2016-06-08 22:24:06 +0000
commitdf179d88080ad7a733edccc655cf5f6bbec6f8fc (patch)
treed1f7b50279ad7221529019078ad2a170fcea5aaf /sysdeps/i386/fpu/e_logl.S
parent9bd3ef8e19b19fb3cfcf99a33a1493035891b990 (diff)
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Fix i386/x86_64 logl (sNaN) (bug 20227).
The i386/x86_64 versions of logl return sNaN for sNaN input.  This
patch fixes them to add a NaN input to itself so that qNaN is returned
in this case.

Tested for x86_64 and x86 (including a build for i586 to cover the
non-i686 logl version).

	[BZ #20227]
	* sysdeps/i386/fpu/e_logl.S (__ieee754_logl): Add NaN input to
	itself.
	* sysdeps/i386/i686/fpu/e_logl.S (__ieee754_logl): Likewise.
	* sysdeps/x86_64/fpu/e_logl.S (__ieee754_logl): Likewise.
	* math/libm-test.inc (log_test_data): Add sNaN tests.
Diffstat (limited to 'sysdeps/i386/fpu/e_logl.S')
-rw-r--r--sysdeps/i386/fpu/e_logl.S1
1 files changed, 1 insertions, 0 deletions
diff --git a/sysdeps/i386/fpu/e_logl.S b/sysdeps/i386/fpu/e_logl.S
index 7a6d370e8f..53127d704e 100644
--- a/sysdeps/i386/fpu/e_logl.S
+++ b/sysdeps/i386/fpu/e_logl.S
@@ -67,6 +67,7 @@ ENTRY(__ieee754_logl)
 3:	jp	4b		// in case x is +-Inf
 	fstp	%st(1)
 	fstp	%st(1)
+	fadd	%st(0)
 	ret
 END (__ieee754_logl)