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authorJoseph Myers <joseph@codesourcery.com>2016-06-08 21:32:57 +0000
committerJoseph Myers <joseph@codesourcery.com>2016-06-08 21:32:57 +0000
commit9946e7a949d3b0f2795d930aa2f2ce7bda5e4f8a (patch)
treeb4d6e0cee63b44011a3cfbf6e4be60db0cd51de4 /math/w_scalblnf.c
parent40720ec9f98d57214d73d6fa98019e684f2eb45a (diff)
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Fix ldexp, scalbn, scalbln for sNaN input (bug 20225).
The wrapper implementations of ldexp / scalbn / scalbln
(architecture-independent), and their float / long double variants,
return sNaN for sNaN input.  This patch fixes them to add relevant
arguments to themselves so that qNaN is returned in this case.

Tested for x86_64 and x86.

	[BZ #20225]
	* math/s_ldexp.c (__ldexp): Add non-finite or zero argument to
	itself.
	* math/s_ldexpf.c (__ldexpf): Likewise.
	* math/s_ldexpl.c (__ldexpl): Likewise.
	* math/w_scalbln.c (__w_scalbln): Likewise.
	* math/w_scalblnf.c (__w_scalblnf): Likewise.
	* math/w_scalblnl.c (__w_scalblnl): Likewise.
	* math/libm-test.inc (scalbn_test_data): Add sNaN tests.
	(scalbln_test_data): Likewise.
Diffstat (limited to 'math/w_scalblnf.c')
-rw-r--r--math/w_scalblnf.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/math/w_scalblnf.c b/math/w_scalblnf.c
index de4dc47382..2a0b237352 100644
--- a/math/w_scalblnf.c
+++ b/math/w_scalblnf.c
@@ -24,7 +24,7 @@ float
 __w_scalblnf (float x, long int n)
 {
   if (!isfinite (x) || x == 0.0f)
-    return x;
+    return x + x;
 
   x = __scalblnf (x, n);