From 56b6134d8cf6c93e24bf17b7f80610029274188d Mon Sep 17 00:00:00 2001
From: janis <janis@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Wed, 6 Feb 2002 22:13:01 +0000
Subject: [PATCH] * loop.c (remove_constant_addition): Avoid clobbering
a shared CONST expression.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@49556 138bc75d-0d04-0410-961f-82ee72b054a4
---
gcc/ChangeLog | 6 ++++++
gcc/loop.c | 13 ++++++++++++-
2 files changed, 18 insertions(+), 1 deletion(-)
diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 778b0d7c6213..6b413d62b1cc 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2002-02-06 Janis Johnson <janis187@us.ibm.com>
+ Jan Hubicka <jh@suse.cz>
+
+ * loop.c (remove_constant_addition): Avoid clobbering a shared
+ CONST expression.
+
2002-02-06 Ulrich Weigand <uweigand@de.ibm.com>
* config.gcc (s390x-*-linux*): Add t-linux64 makefile fragment.
diff --git a/gcc/loop.c b/gcc/loop.c
index 0067e7490fd4..e0847a8c32f7 100644
--- a/gcc/loop.c
+++ b/gcc/loop.c
@@ -3683,8 +3683,19 @@ remove_constant_addition (x)
HOST_WIDE_INT addval = 0;
rtx exp = *x;
+ /* Avoid clobbering a shared CONST expression. */
if (GET_CODE (exp) == CONST)
- exp = XEXP (exp, 0);
+ {
+ if (GET_CODE (XEXP (exp, 0)) == PLUS
+ && GET_CODE (XEXP (XEXP (exp, 0), 0)) == SYMBOL_REF
+ && GET_CODE (XEXP (XEXP (exp, 0), 1)) == CONST_INT)
+ {
+ *x = XEXP (XEXP (exp, 0), 0);
+ return INTVAL (XEXP (XEXP (exp, 0), 1));
+ }
+ return 0;
+ }
+
if (GET_CODE (exp) == CONST_INT)
{
addval = INTVAL (exp);
--
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