From: Richard Kenner <kenner@gcc.gnu.org>
Date: Sat, 9 Apr 1994 20:05:15 +0000 (-0400)
Subject: (fold): Avoid exponential work when simplifying conditional
X-Git-Tag: misc/cutover-egcs-0~6933
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4c64b884062ef166002a9482b43d0d29d4178698;p=thirdparty%2Fgcc.git

(fold): Avoid exponential work when simplifying conditional
expressions; don't recurse twice if ARG1 is constant.

From-SVN: r7010
---

diff --git a/gcc/fold-const.c b/gcc/fold-const.c
index 81f7b4f03011..b3e7e1f8f23c 100644
--- a/gcc/fold-const.c
+++ b/gcc/fold-const.c
@@ -3420,7 +3420,8 @@ fold (expr)
 	      tree lhs = fold (build (code, type, true_value, arg1));
 	      tree rhs = fold (build (code, type, false_value, arg1));
 
-	      if (TREE_CONSTANT (lhs) || TREE_CONSTANT (rhs))
+	      if (TREE_CONSTANT (lhs) || TREE_CONSTANT (rhs)
+		  || TREE_CONSTANT (arg1))
 		return fold (build (COND_EXPR, type, test, lhs, rhs));
 
 	      arg1 = save_expr (arg1);