* calls.c (compute_argument_addresses): Force stack slots into

	alias set 0.
	* expr.c (emit_push_insn): Force pushes into alias set 0.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@34662 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 7 insertions, 0 deletions

diff --git a/gcc/calls.c b/gcc/calls.c
index 5892cba4ce1..3561f5987f4 100644
--- a/gcc/calls.c
+++ b/gcc/calls.c
@@ -1595,6 +1595,13 @@ compute_argument_addresses (args, argblock, num_actuals)
 	  args[i].stack_slot = gen_rtx_MEM (args[i].mode, addr);
 	  set_mem_attributes (args[i].stack_slot,
 			      TREE_TYPE (args[i].tree_value), 1);
+
+	  /* Function incoming arguments may overlap with sibling call
+	     outgoing arguments and we cannot allow reordering of reads
+	     from function arguments with stores to outgoing arguments
+	     of sibling calls.  */
+	  MEM_ALIAS_SET (args[i].stack) = 0;
+	  MEM_ALIAS_SET (args[i].stack_slot) = 0;
 	}
     }
 }