[PATCH] Fix tree-stdarg after "Mark objects death@end of scope" changes

[Jakub Jelinek]

Hi!

This fixes stdarg-2.c failures on i?86-linux, bootstrapped/regtested
on i686-linux, will commit as obvious tonight.

2011-11-11  Jakub Jelinek  <jakub@redhat.com>

	PR tree-optimization/51091
	* tree-stdarg.c (execute_optimize_stdarg): Ignore TREE_CLOBBER_P
	rhs also in the va_list_simple_ptr case.

--- gcc/tree-stdarg.c.jj	2011-11-08 23:35:12.000000000 +0100
+++ gcc/tree-stdarg.c	2011-11-11 15:02:59.005511553 +0100
@@ -847,8 +847,12 @@ execute_optimize_stdarg (void)
 		  if (get_gimple_rhs_class (gimple_assign_rhs_code (stmt))
 		      == GIMPLE_SINGLE_RHS)
 		    {
+		      /* Check for ap ={v} {}.  */
+		      if (TREE_CLOBBER_P (rhs))
+			continue;
+
 		      /* Check for tem = ap.  */
-		      if (va_list_ptr_read (&si, rhs, lhs))
+		      else if (va_list_ptr_read (&si, rhs, lhs))
 			continue;
 
 		      /* Check for the last insn in:
@@ -875,6 +879,7 @@ execute_optimize_stdarg (void)
 		      /* Check for ap ={v} {}.  */
 		      if (TREE_CLOBBER_P (rhs))
 			continue;
+
 		      /* Check for ap[0].field = temp.  */
 		      else if (va_list_counter_struct_op (&si, lhs, rhs, true))
 			continue;

	Jakub