From: Franz Sirl <Franz.Sirl-kernel@lauterbach.com>
Date: Mon, 3 Feb 2003 20:56:29 +0000 (+0000)
Subject: backport: integrate.c (copy_rtx_and_substitute): Squash MEM_EXPR when it refers to... 
X-Git-Tag: releases/gcc-3.2.2~10
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=33b2a2e04ae9067ac53c21ff317dc1b8526b20bb;p=thirdparty%2Fgcc.git

backport: integrate.c (copy_rtx_and_substitute): Squash MEM_EXPR when it refers to a subroutine parameter.

	2003-02-03  Franz Sirl  <Franz.Sirl-kernel@lauterbach.com>

	Backport following patch:

	2002-08-01  Richard Henderson  <rth@redhat.com>

	* integrate.c (copy_rtx_and_substitute): Squash MEM_EXPR when it
	refers to a subroutine parameter.

From-SVN: r62342
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index ff6b5a639e58..65ce1a414455 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,12 @@
+2003-02-03  Franz Sirl  <Franz.Sirl-kernel@lauterbach.com>
+
+	Backport following patch:
+
+	2002-08-01  Richard Henderson  <rth@redhat.com>
+
+	* integrate.c (copy_rtx_and_substitute): Squash MEM_EXPR when it
+	refers to a subroutine parameter.
+
 2003-02-03  Eric Botcazou  <ebotcazou@libertysurf.fr>
 
 	* cfgcleanup.c (try_forward_edges): Check for null insn.
diff --git a/gcc/integrate.c b/gcc/integrate.c
index d90e776637f0..ce2962d2cce7 100644
--- a/gcc/integrate.c
+++ b/gcc/integrate.c
@@ -2320,6 +2320,13 @@ copy_rtx_and_substitute (orig, map, for_lhs)
       if (inlining && !for_lhs)
 	RTX_UNCHANGING_P (copy) = 0;
 
+      /* If inlining, squish aliasing data that references the subroutine's
+	 parameter list, since that's no longer applicable.  */
+      if (inlining && MEM_EXPR (copy)
+	  && TREE_CODE (MEM_EXPR (copy)) == INDIRECT_REF
+	  && TREE_CODE (TREE_OPERAND (MEM_EXPR (copy), 0)) == PARM_DECL)
+	set_mem_expr (copy, NULL_TREE);
+
       return copy;
 
     default: