From f00faa4a43706d85ad8d4d2c970d3f52f0f63bfb Mon Sep 17 00:00:00 2001
From: Joseph Myers <joseph@codesourcery.com>
Date: Thu, 9 Jun 2016 18:04:30 +0000
Subject: 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.
---
 sysdeps/x86_64/fpu/e_log2l.S | 1 +
 1 file changed, 1 insertion(+)

(limited to 'sysdeps/x86_64')

diff --git a/sysdeps/x86_64/fpu/e_log2l.S b/sysdeps/x86_64/fpu/e_log2l.S
index a063255..023ec29 100644
--- a/sysdeps/x86_64/fpu/e_log2l.S
+++ b/sysdeps/x86_64/fpu/e_log2l.S
@@ -63,6 +63,7 @@ ENTRY(__ieee754_log2l)
 	jnz	4b		// in case x is ħInf
 	fstp	%st(1)
 	fstp	%st(1)
+	fadd	%st(0)
 	ret
 END (__ieee754_log2l)
 
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