2012-05-02 Richard Guenther <rguenther@suse.de>

	* tree.c (valid_constant_size_p): New function.
	* tree.h (valid_constant_size_p): Declare.
	* cfgexpand.c (expand_one_var): Adjust check for too large
	variables by using valid_constant_size_p.
	* varasm.c (assemble_variable): Likewise.

	c/
	* c-decl.c (grokdeclarator): Properly check for sizes that
	cover more than half of the address-space.

	cp/
	* decl.c (grokdeclarator): Properly check for sizes that
	cover more than half of the address-space.

2012-05-02  Richard Guenther  <rguenther@suse.de>

	* fold-const.c (div_if_zero_remainder): sizetypes no longer
	sign-extend.
	(int_const_binop_1): New worker for int_const_binop with
	overflowable parameter.  Pass it through
	to force_fit_type_double.
	(int_const_binop): Wrap around int_const_binop_1 with overflowable
	equal to one.
	(size_binop_loc): Call int_const_binop_1 with overflowable equal
	to minus one, forcing overflow detection for even unsigned types.
	(extract_muldiv_1): Remove bogus TYPE_IS_SIZETYPE special-casing.
	(fold_binary_loc): Call try_move_mult_to_index with signed offset.
	* stor-layout.c (initialize_sizetypes): sizetypes no longer
	sign-extend.
	(layout_type): For zero-sized arrays ignore overflow on the
	size calculations.
	* tree-ssa-ccp.c (bit_value_unop_1): Likewise.
	(bit_value_binop_1): Likewise.
	* tree.c (double_int_to_tree): Likewise.
	(double_int_fits_to_tree_p): Likewise.
	(force_fit_type_double): Likewise.
	(host_integerp): Likewise.
	(int_fits_type_p): Likewise.
	* varasm.c (output_constructor_regular_field): Sign-extend the
	field-offset to cater for negative offsets produced by the Ada frontend.
	* omp-low.c (extract_omp_for_data): Convert the loop step to
	signed for pointer adjustments.

	* g++.dg/tree-ssa/pr19807.C: Adjust.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@187042 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 2 insertions, 1 deletions

diff --git a/gcc/cfgexpand.c b/gcc/cfgexpand.c
index 9de3e51c673..4c27e762df5 100644
--- a/gcc/cfgexpand.c
+++ b/gcc/cfgexpand.c
@@ -1241,8 +1241,9 @@ expand_one_var (tree var, bool toplevel, bool really_expand)
       if (really_expand)
         expand_one_register_var (origvar);
     }
-  else if (!host_integerp (DECL_SIZE_UNIT (var), 1))
+  else if (! valid_constant_size_p (DECL_SIZE_UNIT (var)))
     {
+      /* Reject variables which cover more than half of the address-space.  */
       if (really_expand)
 	{
 	  error ("size of variable %q+D is too large", var);