From: Aldy Hernandez <aldyh@redhat.com>
Date: Tue, 20 Sep 2022 14:09:31 +0000 (+0200)
Subject: frange::maybe_isnan() should return FALSE for undefined ranges.
X-Git-Tag: basepoints/gcc-14~4465
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2438b6a4c8df0d1870881e123cc74cc62b7e58e8;p=thirdparty%2Fgcc.git

frange::maybe_isnan() should return FALSE for undefined ranges.

Undefined ranges have undefined NAN bits.  We can't depend on them,
as they may contain garbage.  This patch returns false from
maybe_isnan() for undefined ranges (the empty set).

gcc/ChangeLog:

	* value-range.h (frange::maybe_isnan): Return false for
	undefined ranges.
---

diff --git a/gcc/value-range.h b/gcc/value-range.h
index 7d5584a9294c..325ed08f290d 100644
--- a/gcc/value-range.h
+++ b/gcc/value-range.h
@@ -1210,6 +1210,8 @@ frange::known_isinf () const
 inline bool
 frange::maybe_isnan () const
 {
+  if (undefined_p ())
+    return false;
   return m_pos_nan || m_neg_nan;
 }