[PATCH] gdb/doublest.c: Avoid calling ldfrexp if long double is double.

[Will Newton <will.newton@linaro.org>]

There's no need to call ldfrexp if long double is the same size
as double, the standard frexp will be faster and more accurate.
This fixes a failure in ldbl_308.exp on ARM, where long double
is the same size as double.

gdb/ChangeLog:

2013-06-07  Will Newton  <will.newton@linaro.org>

	* doublest.c (convert_doublest_to_floatformat): If long
	double is the same size as double call frexp instead of
	ldfrexp.
---
 gdb/doublest.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/gdb/doublest.c b/gdb/doublest.c
index 9ddc7a6..4bc0bd6 100644
--- a/gdb/doublest.c
+++ b/gdb/doublest.c
@@ -466,7 +466,10 @@ convert_doublest_to_floatformat (CONST struct floatformat *fmt,
     }

 #ifdef HAVE_LONG_DOUBLE
-  mant = ldfrexp (dfrom, &exponent);
+  if (sizeof (long double) > sizeof (double))
+    mant = ldfrexp (dfrom, &exponent);
+  else
+    mant = frexp (dfrom, &exponent);
 #else
   mant = frexp (dfrom, &exponent);
 #endif
-- 
1.8.1.4