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re PR tree-optimization/48172 (incorrect vectorization of loop in GCC 4.5.* with -O3) 

2011-05-13  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/48172
	* tree-vect-loop-manip.c (vect_vfa_segment_size): Avoid
	multiplying by number of iterations for equal step.
	(vect_create_cond_for_alias_checks): Likewise.

From-SVN: r173725
This commit is contained in:
Richard Guenther 2011-05-13 08:31:18 +00:00 committed by Richard Biener
parent b88ecf553e
commit 208cb8cbad
2 changed files with 17 additions and 13 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2011-05-13 Richard Guenther <rguenther@suse.de>
PR tree-optimization/48172
* tree-vect-loop-manip.c (vect_vfa_segment_size): Avoid
multiplying by number of iterations for equal step.
(vect_create_cond_for_alias_checks): Likewise.
2011-05-13 Andreas Schwab <schwab@redhat.com>
* configure.ac: Use AS_HELP_STRING throughout.

23
gcc/tree-vect-loop-manip.c
View File

@ -2353,23 +2353,18 @@ vect_create_cond_for_align_checks (loop_vec_info loop_vinfo,
Input:
DR: The data reference.
VECT_FACTOR: vectorization factor.
SCALAR_LOOP_NITERS: number of iterations.
LENGTH_FACTOR: segment length to consider.
Return an expression whose value is the size of segment which will be
accessed by DR. */
static tree
vect_vfa_segment_size (struct data_reference *dr, int vect_factor,
tree scalar_loop_niters)
vect_vfa_segment_size (struct data_reference *dr, tree length_factor)
{
tree segment_length;
segment_length = size_binop (MULT_EXPR,
fold_convert (sizetype, DR_STEP (dr)),
size_int (vect_factor));
segment_length = size_binop (MULT_EXPR,
segment_length,
fold_convert (sizetype, scalar_loop_niters));
fold_convert (sizetype, length_factor));
if (vect_supportable_dr_alignment (dr, false)
== dr_explicit_realign_optimized)
{
@ -2417,7 +2412,7 @@ vect_create_cond_for_alias_checks (loop_vec_info loop_vinfo,
ddr_p ddr;
unsigned int i;
tree part_cond_expr;
tree part_cond_expr, length_factor;
/* Create expression
((store_ptr_0 + store_segment_length_0) < load_ptr_0)
@ -2465,10 +2460,12 @@ vect_create_cond_for_alias_checks (loop_vec_info loop_vinfo,
vect_create_addr_base_for_vector_ref (stmt_b, cond_expr_stmt_list,
NULL_TREE, loop);
segment_length_a = vect_vfa_segment_size (dr_a, vect_factor,
scalar_loop_iters);
segment_length_b = vect_vfa_segment_size (dr_b, vect_factor,
scalar_loop_iters);
if (!operand_equal_p (DR_STEP (dr_a), DR_STEP (dr_b), 0))
length_factor = scalar_loop_iters;
else
length_factor = size_int (vect_factor);
segment_length_a = vect_vfa_segment_size (dr_a, length_factor);
segment_length_b = vect_vfa_segment_size (dr_b, length_factor);
if (vect_print_dump_info (REPORT_DR_DETAILS))
{