Check rvc_normal in real_isdenormal.

[-Inf, -Inf] is being flushed to [-Inf, -0.0] because real_isdenormal
is being overly pessimistic.  It is missing a check for rvc_normal.
This doesn't cause problems in real.cc because all uses of
real_isdenormal are already on the rvc_normal path.  The uses in
value-range.cc however, are not.

This patch adds a check for rvc_normal.

gcc/ChangeLog:

	* real.h (real_isdenormal): Check rvc_normal.
	* value-range.cc (range_tests_floats): New test.

1 files changed, 1 insertions, 1 deletions

diff --git a/gcc/real.h b/gcc/real.h
index f9528d7..306e959 100644
--- a/gcc/real.h
+++ b/gcc/real.h
@@ -290,7 +290,7 @@ extern bool real_issignaling_nan (const REAL_VALUE_TYPE *);
 inline bool
 real_isdenormal (const REAL_VALUE_TYPE *r)
 {
-  return (r->sig[SIGSZ-1] & SIG_MSB) == 0;
+  return r->cl == rvc_normal && (r->sig[SIGSZ-1] & SIG_MSB) == 0;
 }
 
 /* Determine whether a floating-point value X is finite.  */