tree-sra.c (build_ref_for_offset): Strip useless type conversions from the…

tree-sra.c (build_ref_for_offset): Strip useless type conversions from the address built for a reference with...

	* tree-sra.c (build_ref_for_offset): Strip useless type conversions
	from the address built for a reference with variable offset.

From-SVN: r171393

gcc/ChangeLog

+2011-03-24  Eric Botcazou  <ebotcazou@adacore.com>
+
+	* tree-sra.c (build_ref_for_offset): Strip useless type conversions
+	from the address built for a reference with variable offset.
+
 2011-03-24  Uros Bizjak  <ubizjak@gmail.com>
 
 	PR target/48237

gcc/testsuite/ChangeLog

+2011-03-24  Eric Botcazou  <ebotcazou@adacore.com>
+
+	* gnat.dg/array15.ad[sb]: New test.
+
 2011-03-24  Uros Bizjak  <ubizjak@gmail.com>
 
 	PR target/48237

gcc/testsuite/gnat.dg/array15.adb

+-- { dg-do compile }
+-- { dg-options "-O -gnatws" }
+
+package body Array15 is
+
+   type Arr is array (Natural range <>) of Integer;
+
+   Table : Arr (1 .. 4);
+
+   N : Natural := 1;
+
+   procedure Zero is
+   begin
+      N := 0;
+   end;
+
+   function F (I : Integer) return Integer is
+      A1 : Arr := (1 => I);
+      A2 : Arr := Table (1 .. N) & A1;
+   begin
+      return A2 (I);
+   end;
+
+end Array15;

gcc/testsuite/gnat.dg/array15.ads

+package Array15 is
+
+   function F (I : Integer) return Integer;
+
+end Array15;

gcc/tree-sra.c

@@ -1376,6 +1376,7 @@ build_ref_for_offset (location_t loc, tree base, HOST_WIDE_INT offset,
       add_referenced_var (tmp);
       tmp = make_ssa_name (tmp, NULL);
       addr = build_fold_addr_expr (unshare_expr (prev_base));
+      STRIP_USELESS_TYPE_CONVERSION (addr);
       stmt = gimple_build_assign (tmp, addr);
       gimple_set_location (stmt, loc);
       SSA_NAME_DEF_STMT (tmp) = stmt;