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cfgexpand.c (add_stack_var): Assert that the alignment is not zero. 

* cfgexpand.c (add_stack_var): Assert that the alignment is not zero.
	* tree-ssa-ccp.c (fold_builtin_alloca_for_var): Revert latest change.
	Force at least BITS_PER_UNIT alignment on the new variable.

From-SVN: r178499
This commit is contained in:
Eric Botcazou 2011-09-03 14:56:53 +00:00 committed by Eric Botcazou
parent 1822c31f05
commit 13868f4049
3 changed files with 10 additions and 2 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2011-09-03 Eric Botcazou <ebotcazou@adacore.com>
* cfgexpand.c (add_stack_var): Assert that the alignment is not zero.
* tree-ssa-ccp.c (fold_builtin_alloca_for_var): Revert latest change.
Force at least BITS_PER_UNIT alignment on the new variable.
2011-09-02 Gary Funck <gary@intrepid.com>
* opts.c (print_specific_help): Fix off-by-one compare in

2
gcc/cfgexpand.c
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@ -271,6 +271,8 @@ add_stack_var (tree decl)
if (v->size == 0)
v->size = 1;
v->alignb = align_local_variable (SSAVAR (decl));
/* An alignment of zero can mightily confuse us later. */
gcc_assert (v->alignb != 0);
/* All variables are initially in their own partition. */
v->representative = stack_vars_num;

4
gcc/tree-ssa-ccp.c
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@ -1708,8 +1708,6 @@ fold_builtin_alloca_for_var (gimple stmt)
return NULL_TREE;
size = TREE_INT_CST_LOW (arg);
if (size == 0)
return NULL_TREE;
/* Heuristic: don't fold large vlas. */
threshold = (unsigned HOST_WIDE_INT)PARAM_VALUE (PARAM_LARGE_STACK_FRAME);
@ -1726,6 +1724,8 @@ fold_builtin_alloca_for_var (gimple stmt)
elem_type = build_nonstandard_integer_type (BITS_PER_UNIT, 1);
n_elem = size * 8 / BITS_PER_UNIT;
align = MIN (size * 8, BIGGEST_ALIGNMENT);
if (align < BITS_PER_UNIT)
align = BITS_PER_UNIT;
array_type = build_array_type_nelts (elem_type, n_elem);
var = create_tmp_var (array_type, NULL);
DECL_ALIGN (var) = align;