re PR tree-optimization/59356 (ACATS C52102A and C52102C failures)

	PR tree-optimization/59356
	* tree-dfa.h (get_addr_base_and_unit_offset_1) <case ARRAY_REF>: Do the
	offset computation using the precision of the index type.

From-SVN: r205585

gcc/ChangeLog

+2013-12-02  Eric Botcazou  <ebotcazou@adacore.com>
+
+	PR tree-optimization/59356
+	* tree-dfa.h (get_addr_base_and_unit_offset_1) <case ARRAY_REF>: Do the
+	offset computation using the precision of the index type.
+
 2013-12-02  Yvan Roux  <yvan.roux@linaro.org>
 
 	PR target/58785

gcc/testsuite/ChangeLog

+2013-12-02  Eric Botcazou  <ebotcazou@adacore.com>
+
+	* gnat.dg/opt30.adb: New test.
+
 2013-12-01  Paul Thomas  <pault@gcc.gnu.org>
 
 	PR fortran/57354

gcc/testsuite/gnat.dg/opt30.adb

+-- { dg-do run }
+-- { dg-options "-O" }
+
+procedure Opt30 is
+
+   function Id_I (I : Integer) return Integer is
+   begin
+      return I;
+   end;
+
+   A : array (Integer range -4..4) of Integer;
+
+begin
+   A := (-ID_I(4), -ID_I(3), -ID_I(2), -ID_I(1), ID_I(100),
+          ID_I(1), ID_I(2), ID_I(3), ID_I(4));
+   A(-4..0) := A(0..4);
+   if A /= (100, 1, 2, 3, 4, 1, 2, 3, 4) then
+      raise Program_Error;
+   end if;
+end;

gcc/tree-dfa.h

@@ -102,11 +102,11 @@ get_addr_base_and_unit_offset_1 (tree exp, HOST_WIDE_INT *poffset,
 		&& (unit_size = array_ref_element_size (exp),
 		    TREE_CODE (unit_size) == INTEGER_CST))
 	      {
-		HOST_WIDE_INT hindex = TREE_INT_CST_LOW (index);
-
-		hindex -= TREE_INT_CST_LOW (low_bound);
-		hindex *= TREE_INT_CST_LOW (unit_size);
-		byte_offset += hindex;
+		double_int doffset
+		  = (TREE_INT_CST (index) - TREE_INT_CST (low_bound))
+		    .sext (TYPE_PRECISION (TREE_TYPE (index)));
+		doffset *= tree_to_double_int (unit_size);
+		byte_offset += doffset.to_shwi ();
 	      }
 	    else
 	      return NULL_TREE;