From 3bc400cdc1d413b96b07bf8d590a5e99bf9c326a Mon Sep 17 00:00:00 2001
From: Roger Sayle <sayle@gcc.gnu.org>
Date: Wed, 19 Feb 2003 22:59:33 +0000
Subject: [PATCH] fold-const.c (fold_real_zero_addition_p): Don't fold a zero
addition in the presence of signaling NaNs.
* fold-const.c (fold_real_zero_addition_p): Don't fold a zero
addition in the presence of signaling NaNs.
From-SVN: r63133
---
gcc/ChangeLog | 12 +++++++++---
gcc/fold-const.c | 4 ++++
2 files changed, 13 insertions(+), 3 deletions(-)
diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 26807a1c8992..da21d117faee 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2003-02-19 Roger Sayle <roger@eyesopen.com>
+
+ * fold-const.c (fold_real_zero_addition_p): Don't fold a zero
+ addition in the presence of signaling NaNs.
+
2003-02-19 Krister Walfridsson <cato@df.lth.se>
* tm.texi (INIT_CUMULATIVE_ARGS): Fix typo.
@@ -109,9 +114,10 @@ Tue Feb 18 23:50:59 CET 2003 Jan Hubicka <jh@suse.cz>
(cgraph_expand_function): Rewrite.
2003-02-18 Matt Austern <austern@apple.com>
+
* toplev.c, langhooks.c, langhooks-def.h: Move
write_global_declarations from toplev.c to langhooks.c.
-
+
2003-02-18 Kazu Hirata <kazu@cs.umass.edu>
* config/h8300/h8300.c (general_operand_src): Always check
@@ -168,8 +174,8 @@ Tue Feb 18 23:50:59 CET 2003 Jan Hubicka <jh@suse.cz>
Tue Feb 18 20:15:54 2003 J"orn Rennecke <joern.rennecke@superh.com>
- * sh.c (calc_live_regs): Also check GET_CODE when checking if initial value
- for PR_REG is still the PR_REG register.
+ * sh.c (calc_live_regs): Also check GET_CODE when checking if
+ initial value for PR_REG is still the PR_REG register.
2003-02-18 Jim Wilson <wilson@redhat.com>
diff --git a/gcc/fold-const.c b/gcc/fold-const.c
index 5dfa1e413ec7..6b50a86a097b 100644
--- a/gcc/fold-const.c
+++ b/gcc/fold-const.c
@@ -4642,6 +4642,10 @@ fold_real_zero_addition_p (type, addend, negate)
if (!real_zerop (addend))
return false;
+ /* Don't allow the fold with -fsignaling-nans. */
+ if (HONOR_SNANS (TYPE_MODE (type)))
+ return false;
+
/* Allow the fold if zeros aren't signed, or their sign isn't important. */
if (!HONOR_SIGNED_ZEROS (TYPE_MODE (type)))
return true;
--
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