From: Eric Botcazou <ebotcazou@libertysurf.fr>
Date: Sun, 24 Nov 2002 22:14:19 +0000 (+0000)
Subject: re PR rtl-optimization/8275 (ICE in simplify_subreg, at simplify-rtx.c:2452)
X-Git-Tag: releases/gcc-3.2.2~251
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6c789e46a0efec9e527d96b93662f6d8a30a021a;p=thirdparty%2Fgcc.git

re PR rtl-optimization/8275 (ICE in simplify_subreg, at simplify-rtx.c:2452)

	PR optimization/8275

	Merge from mainline:
	2002-09-19 �Dale Johannesen <dalej@apple.com>

	* combine.c (make_extraction): Don't create
	invalid subreg.

From-SVN: r59440
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 0389723068bd..c32a397933d8 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,13 @@
+2002-11-24  Eric Botcazou  <ebotcazou@libertysurf.fr>
+
+	PR optimization/8275
+
+	Merge from mainline:
+	2002-09-19  Dale Johannesen <dalej@apple.com>
+
+	* combine.c (make_extraction): Don't create
+	invalid subreg.
+
 2002-11-23  Marek Michalkiewicz  <marekm@amelek.gda.pl>
 
 	2002-09-26  Theodore A. Roth  <troth@verinet.com>
diff --git a/gcc/combine.c b/gcc/combine.c
index acaf3b15869a..65564d98310d 100644
--- a/gcc/combine.c
+++ b/gcc/combine.c
@@ -6016,6 +6016,11 @@ make_extraction (mode, inner, pos, pos_rtx, len,
 		final_word += (GET_MODE_SIZE (inner_mode)
 			       - GET_MODE_SIZE (tmode)) % UNITS_PER_WORD;
 
+	      /* Avoid creating invalid subregs, for example when
+		 simplifying (x>>32)&255. */
+	      if (final_word >= GET_MODE_SIZE (inner_mode))
+		return NULL_RTX;
+
 	      new = gen_rtx_SUBREG (tmode, inner, final_word);
 	    }
 	  else