re PR rtl-optimization/42617 (TARGET_MEM_REF and plain INDIRECT_REFs are not handled...

2010-04-07  Richard Guenther  <rguenther@suse.de>

	PR middle-end/42617
	* expr.c (expand_expr_real_1): For TARGET_MEM_REFs with
	pointer bases build simple mem attributes to retain
	points-to information.

From-SVN: r158048

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 4c9b75ac9b9aac72e2954c042fb7ad244cac459a..b4aa73ebee4aa047bc7edb41861e4b3e35f8aeef 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+2010-04-07  Richard Guenther  <rguenther@suse.de>
+
+       PR middle-end/42617
+       * expr.c (expand_expr_real_1): For TARGET_MEM_REFs with
+       pointer bases build simple mem attributes to retain
+       points-to information.
+
 2010-04-07  Richard Guenther  <rguenther@suse.de>
 
        PR middle-end/42617

diff --git a/gcc/expr.c b/gcc/expr.c
index ad66d934d2f324532d1e6436a6dace93db132ed3..1f04ffb3bb44388e8521b8d28c6694173473b551 100644 (file)
--- a/gcc/expr.c
+++ b/gcc/expr.c
@@ -8730,6 +8730,7 @@ expand_expr_real_1 (tree exp, rtx target, enum machine_mode tmode,
       {
        addr_space_t as = TYPE_ADDR_SPACE (TREE_TYPE (exp));
        struct mem_address addr;
+       tree base;
 
        get_address_description (exp, &addr);
        op0 = addr_for_mem_ref (&addr, as, true);
@@ -8737,6 +8738,16 @@ expand_expr_real_1 (tree exp, rtx target, enum machine_mode tmode,
        temp = gen_rtx_MEM (mode, op0);
        set_mem_attributes (temp, TMR_ORIGINAL (exp), 0);
        set_mem_addr_space (temp, as);
+       base = get_base_address (TMR_ORIGINAL (exp));
+       if (INDIRECT_REF_P (base)
+           && TMR_BASE (exp)
+           && TREE_CODE (TMR_BASE (exp)) == SSA_NAME
+           && POINTER_TYPE_P (TREE_TYPE (TMR_BASE (exp))))
+         {
+           set_mem_expr (temp, build1 (INDIRECT_REF,
+                                       TREE_TYPE (exp), TMR_BASE (exp)));
+           set_mem_offset (temp, NULL_RTX);
+         }
       }
       return temp;