From: Uros Bizjak <ubizjak@gmail.com>
Date: Mon, 2 Aug 2010 17:26:40 +0000 (+0200)
Subject: alpha.c (alpha_build_builtin_va_list): Mark __offset as volatile.
X-Git-Tag: releases/gcc-4.6.0~5283
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fea8c257250f4535a05716673597577fe3a7a605;p=thirdparty%2Fgcc.git

alpha.c (alpha_build_builtin_va_list): Mark __offset as volatile.

	target/41089
	* config/alpha/alpha.c (alpha_build_builtin_va_list): Mark __offset
	as volatile.

From-SVN: r162826
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index ad2b271a5bb4..c37e93d3e13d 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2010-08-02  Uros Bizjak  <ubizjak@gmail.com>
+
+	PR target/41089
+	* config/alpha/alpha.c (alpha_build_builtin_va_list): Mark __offset
+	as volatile.
+
 2010-08-02  Sebastian Pop  <sebastian.pop@amd.com>
 
 	* common.opt (ftree-loop-distribute-patterns): New.
diff --git a/gcc/config/alpha/alpha.c b/gcc/config/alpha/alpha.c
index 35d66b64a0a9..1cfca586a87f 100644
--- a/gcc/config/alpha/alpha.c
+++ b/gcc/config/alpha/alpha.c
@@ -5950,6 +5950,10 @@ alpha_build_builtin_va_list (void)
 		    integer_type_node);
   DECL_FIELD_CONTEXT (ofs) = record;
   DECL_CHAIN (ofs) = space;
+  /* ??? This is a hack, __offset is marked volatile to prevent
+     DCE that confuses stdarg optimization and results in
+     gcc.c-torture/execute/stdarg-1.c failure.  See PR 41089.  */
+  TREE_THIS_VOLATILE (ofs) = 1;
 
   base = build_decl (BUILTINS_LOCATION,
 		     FIELD_DECL, get_identifier ("__base"),