From: Philip Blundell <philb@gnu.org>
Date: Fri, 12 Mar 2004 20:10:06 +0000 (+0000)
Subject: re PR target/10730 ([arm] -O2 generates invalid asm)
X-Git-Tag: releases/gcc-3.3.4~175
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=95cbc4964b81b5296650675801192358b05f0e70;p=thirdparty%2Fgcc.git

re PR target/10730 ([arm] -O2 generates invalid asm)

2004-03-12  Philip Blundell  <philb@gnu.org>

	PR target/10730
	Backport from trunk:
	2003-05-15  Philip Blundell  <philb@gnu.org>
	* config/arm/arm.c (adjacent_mem_locations): Reject offsets
	involving invalid constants.

From-SVN: r79405
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 7561fcd3d70e..41e9e8128528 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,11 @@
+2004-03-12  Philip Blundell  <philb@gnu.org>
+
+	PR target/10730
+	Backport from trunk:
+	2003-05-15  Philip Blundell  <philb@gnu.org>
+	* config/arm/arm.c (adjacent_mem_locations): Reject offsets
+	involving invalid constants.
+ 
 2004-03-12  Philip Blundell  <philb@gnu.org>
 
 	PR target/14558
diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c
index 7422f1d03aff..1efadc61db05 100644
--- a/gcc/config/arm/arm.c
+++ b/gcc/config/arm/arm.c
@@ -3778,6 +3778,12 @@ adjacent_mem_locations (a, b)
       else
 	reg1 = REGNO (XEXP (b, 0));
 
+      /* Don't accept any offset that will require multiple instructions to handle,
+	 since this would cause the arith_adjacentmem pattern to output an overlong
+	 sequence.  */
+      if (!const_ok_for_op (PLUS, val0) || !const_ok_for_op (PLUS, val1))
+	return 0;
+      
       return (reg0 == reg1) && ((val1 - val0) == 4 || (val0 - val1) == 4);
     }
   return 0;