stor-layout.c (element_precision): New function.

2013-05-10  Marc Glisse  <marc.glisse@inria.fr>

gcc/
	* stor-layout.c (element_precision): New function.
	* machmode.h (element_precision): Declare it.
	* tree.c (build_minus_one_cst): New function.
	(element_precision): Likewise.
	* tree.h (build_minus_one_cst): Declare new function.
	(element_precision): Likewise.
	* fold-const.c (operand_equal_p): Use element_precision.
	(fold_binary_loc): Handle vector types.
	* convert.c (convert_to_integer): Use element_precision.
	* gimple.c (iterative_hash_canonical_type): Handle complex and vectors
	separately.

gcc/c-family/
	* c-common.c (vector_types_convertible_p): No TYPE_PRECISION for
	vectors.

gcc/testsuite/
	* gcc.dg/vector-shift.c: New testcase.

From-SVN: r198772

1 files changed, 52 insertions, 0 deletions

diff --git a/gcc/tree.c b/gcc/tree.c
index 55fa99b..d93c6ae 100644
--- a/gcc/tree.c
+++ b/gcc/tree.c
@@ -1643,6 +1643,45 @@ build_one_cst (tree type)
     }
 }
 
+/* Return a constant of arithmetic type TYPE which is the
+   opposite of the multiplicative identity of the set TYPE.  */
+
+tree
+build_minus_one_cst (tree type)
+{
+  switch (TREE_CODE (type))
+    {
+    case INTEGER_TYPE: case ENUMERAL_TYPE: case BOOLEAN_TYPE:
+    case POINTER_TYPE: case REFERENCE_TYPE:
+    case OFFSET_TYPE:
+      return build_int_cst (type, -1);
+
+    case REAL_TYPE:
+      return build_real (type, dconstm1);
+
+    case FIXED_POINT_TYPE:
+      /* We can only generate 1 for accum types.  */
+      gcc_assert (ALL_SCALAR_ACCUM_MODE_P (TYPE_MODE (type)));
+      return build_fixed (type, fixed_from_double_int (double_int_minus_one,
+						       TYPE_MODE (type)));
+
+    case VECTOR_TYPE:
+      {
+	tree scalar = build_minus_one_cst (TREE_TYPE (type));
+
+	return build_vector_from_val (type, scalar);
+      }
+
+    case COMPLEX_TYPE:
+      return build_complex (type,
+			    build_minus_one_cst (TREE_TYPE (type)),
+			    build_zero_cst (TREE_TYPE (type)));
+
+    default:
+      gcc_unreachable ();
+    }
+}
+
 /* Build 0 constant of type TYPE.  This is used by constructor folding
    and thus the constant should be represented in memory by
    zero(es).  */
@@ -6949,6 +6988,19 @@ valid_constant_size_p (const_tree size)
   return true;
 }
 
+/* Return the precision of the type, or for a complex or vector type the
+   precision of the type of its elements.  */
+
+unsigned int
+element_precision (const_tree type)
+{
+  enum tree_code code = TREE_CODE (type);
+  if (code == COMPLEX_TYPE || code == VECTOR_TYPE)
+    type = TREE_TYPE (type);
+
+  return TYPE_PRECISION (type);
+}
+
 /* Return true if CODE represents an associative tree code.  Otherwise
    return false.  */
 bool