From: Richard Kenner <kenner@gcc.gnu.org>
Date: Mon, 16 May 1994 20:21:39 +0000 (-0400)
Subject: (try_pre_increment_1): Don't try to create a pre-increment expression
X-Git-Tag: misc/cutover-egcs-0~6635
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=89861c38672f0615c9c2c104327a428fb6a997f6;p=thirdparty%2Fgcc.git

(try_pre_increment_1): Don't try to create a pre-increment expression
if the register dies in the succeeding insn.

From-SVN: r7308
---

diff --git a/gcc/flow.c b/gcc/flow.c
index 71d15ad7014f..448608cdc52a 100644
--- a/gcc/flow.c
+++ b/gcc/flow.c
@@ -2516,6 +2516,9 @@ try_pre_increment_1 (insn)
   rtx y = reg_next_use[regno];
   if (y != 0
       && BLOCK_NUM (y) == BLOCK_NUM (insn)
+      /* Don't do this if the reg dies, or gets set in y; a standard addressing
+	 mode would be better. */
+      && ! dead_or_set_p (y, SET_DEST (x))
       && try_pre_increment (y, SET_DEST (PATTERN (insn)),
 			    amount))
     {