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authorJoseph Myers <joseph@codesourcery.com>2016-06-13 17:27:19 +0000
committerJoseph Myers <joseph@codesourcery.com>2016-06-13 17:27:19 +0000
commit88283451b26de29d08ba33148cf2f8cb2680f6f0 (patch)
tree334945ab68b411d9bac8696fbcaba40a6598ed2b /sysdeps/ieee754/ldbl-96
parentb39b6e0c902f0bf5f99d593b8f5953943777c610 (diff)
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Fix frexp (NaN) (bug 20250).
Various implementations of frexp functions return sNaN for sNaN
input.  This patch fixes them to add such arguments to themselves so
that qNaN is returned.

Tested for x86_64, x86, mips64 and powerpc.

	[BZ #20250]
	* sysdeps/i386/fpu/s_frexpl.S (__frexpl): Add non-finite input to
	itself.
	* sysdeps/ieee754/dbl-64/s_frexp.c (__frexp): Add non-finite or
	zero input to itself.
	* sysdeps/ieee754/dbl-64/wordsize-64/s_frexp.c (__frexp):
	Likewise.
	* sysdeps/ieee754/flt-32/s_frexpf.c (__frexpf): Likewise.
	* sysdeps/ieee754/ldbl-128/s_frexpl.c (__frexpl): Likewise.
	* sysdeps/ieee754/ldbl-128ibm/s_frexpl.c (__frexpl): Likewise.
	* sysdeps/ieee754/ldbl-96/s_frexpl.c (__frexpl): Likewise.
	* math/libm-test.inc (frexp_test_data): Add sNaN tests.
Diffstat (limited to 'sysdeps/ieee754/ldbl-96')
-rw-r--r--sysdeps/ieee754/ldbl-96/s_frexpl.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/sysdeps/ieee754/ldbl-96/s_frexpl.c b/sysdeps/ieee754/ldbl-96/s_frexpl.c
index ab217a659b..799880f373 100644
--- a/sysdeps/ieee754/ldbl-96/s_frexpl.c
+++ b/sysdeps/ieee754/ldbl-96/s_frexpl.c
@@ -46,7 +46,7 @@ long double __frexpl(long double x, int *eptr)
 	GET_LDOUBLE_WORDS(se,hx,lx,x);
 	ix = 0x7fff&se;
 	*eptr = 0;
-	if(ix==0x7fff||((ix|hx|lx)==0)) return x;	/* 0,inf,nan */
+	if(ix==0x7fff||((ix|hx|lx)==0)) return x + x;	/* 0,inf,nan */
 	if (ix==0x0000) {		/* subnormal */
 	    x *= two65;
 	    GET_LDOUBLE_EXP(se,x);