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authorJoseph Myers <joseph@codesourcery.com>2016-06-09 18:04:30 +0000
committerJoseph Myers <joseph@codesourcery.com>2016-06-09 18:04:30 +0000
commitf00faa4a43706d85ad8d4d2c970d3f52f0f63bfb (patch)
tree3ab8e31041ab2f0cd87b4b1501c1570a10a2d7dd /sysdeps/i386
parentb7519f61fe2c57981c69c0c65996968b9a4d9b62 (diff)
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Fix i386/x86_64 log2l (sNaN) (bug 20235).
The i386/x86_64 versions of log2l return sNaN for sNaN input.  This
patch fixes them to add NaN inputs to themselves so that qNaN is
returned in this case.

Tested for x86_64 and x86.

	[BZ #20235]
	* sysdeps/i386/fpu/e_log2l.S (__ieee754_log2l): Add NaN input to
	itself.
	* sysdeps/x86_64/fpu/e_log2l.S (__ieee754_log2l): Likewise.
	* math/libm-test.inc (log2_test_data): Add sNaN tests.
Diffstat (limited to 'sysdeps/i386')
-rw-r--r--sysdeps/i386/fpu/e_log2l.S1
1 files changed, 1 insertions, 0 deletions
diff --git a/sysdeps/i386/fpu/e_log2l.S b/sysdeps/i386/fpu/e_log2l.S
index 0f5f7e5789..73e62ea908 100644
--- a/sysdeps/i386/fpu/e_log2l.S
+++ b/sysdeps/i386/fpu/e_log2l.S
@@ -64,6 +64,7 @@ ENTRY(__ieee754_log2l)
 3:	jp	4b		// in case x is ħInf
 	fstp	%st(1)
 	fstp	%st(1)
+	fadd	%st(0)
 	ret
 END (__ieee754_log2l)
 strong_alias (__ieee754_log2l, __log2l_finite)