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

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
fea8c257 · Uros Bizjak · Uros Bizjak · 071bdb5f · fea8c257 · fea8c257
Commit fea8c257 authored Aug 02, 2010 by Uros Bizjak Committed by Uros Bizjak Aug 02, 2010
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gcc/ChangeLog
+6 -0

gcc/config/alpha/alpha.c
+4 -0

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--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
+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.

--- 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"),