From 0e256a822b855ecae6b5ef593b30a7e2e522e6d1 Mon Sep 17 00:00:00 2001
From: Andrew Pinski <pinskia@physics.uc.edu>
Date: Tue, 28 Dec 2004 15:56:51 +0000
Subject: [PATCH] fold-const.c (fold_build_cleanup_point_expr): For a
RETURN_EXPR...
2004-12-28 Andrew Pinski <pinskia@physics.uc.edu>
* fold-const.c (fold_build_cleanup_point_expr): For a RETURN_EXPR,
we only need a cleanup point expression when the expression on the
left hand side of the MODIFIY_EXPR inside the return has side
effects.
From-SVN: r92672
---
gcc/ChangeLog | 7 +++++++
gcc/fold-const.c | 15 +++++++++++++++
2 files changed, 22 insertions(+)
diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index af19fd89d5d2..ba2abe3d67d0 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+2004-12-28 Andrew Pinski <pinskia@physics.uc.edu>
+
+ * fold-const.c (fold_build_cleanup_point_expr): For a RETURN_EXPR,
+ we only need a cleanup point expression when the expression on the
+ left hand side of the MODIFIY_EXPR inside the return has side
+ effects.
+
2004-12-28 Dorit Naishlos <dorit@il.ibm.com>
* tree-vectorizer.c (vect_mark_relevant) First argument changed from
diff --git a/gcc/fold-const.c b/gcc/fold-const.c
index 8f8624cf5994..5006998352c6 100644
--- a/gcc/fold-const.c
+++ b/gcc/fold-const.c
@@ -10783,6 +10783,21 @@ fold_build_cleanup_point_expr (tree type, tree expr)
it with a cleanup point expression. */
if (!TREE_SIDE_EFFECTS (expr))
return expr;
+
+ /* If the expression is a return, check to see if the expression inside the
+ return has no side effects or the right hand side of the modify expression
+ inside the return. If either don't have side effects set we don't need to
+ wrap the expression in a cleanup point expression. Note we don't check the
+ left hand side of the modify because it should always be a return decl. */
+ if (TREE_CODE (expr) == RETURN_EXPR)
+ {
+ tree op = TREE_OPERAND (expr, 0);
+ if (!op || !TREE_SIDE_EFFECTS (op))
+ return expr;
+ op = TREE_OPERAND (op, 1);
+ if (!TREE_SIDE_EFFECTS (op))
+ return expr;
+ }
return build1 (CLEANUP_POINT_EXPR, type, expr);
}
--
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