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re PR middle-end/60482 (Loop optimization regression)

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PR middle-end/60482
	* tree-vrp.c (register_edge_assert_for_1): Don't add assert
	if there are multiple uses, but op doesn't live on E edge.
	* tree-cfg.c (assert_unreachable_fallthru_edge_p): Also ignore
	clobber stmts before __builtin_unreachable.

	* gcc.dg/vect/pr60482.c: New test.

From-SVN: r208506
This commit is contained in:
Jakub Jelinek 2014-03-12 10:15:08 +01:00 committed by Jakub Jelinek
parent 33a9145bb7
commit b24ca895d7
5 changed files with 38 additions and 8 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
2014-03-12 Jakub Jelinek <jakub@redhat.com>
PR middle-end/60482
* tree-vrp.c (register_edge_assert_for_1): Don't add assert
if there are multiple uses, but op doesn't live on E edge.
* tree-cfg.c (assert_unreachable_fallthru_edge_p): Also ignore
clobber stmts before __builtin_unreachable.
2014-03-11 Richard Sandiford <rdsandiford@googlemail.com>
* builtins.c (expand_builtin_setjmp_receiver): Use and clobber

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2014-03-12 Jakub Jelinek <jakub@redhat.com>
PR middle-end/60482
* gcc.dg/vect/pr60482.c: New test.
2014-03-11 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/60389

20
gcc/testsuite/gcc.dg/vect/pr60482.c Normal file
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@ -0,0 +1,20 @@
/* PR middle-end/60482 */
/* { dg-do compile } */
/* { dg-additional-options "-Ofast" } */
/* { dg-require-effective-target vect_int } */
double
foo (double *x, int n)
{
double p = 0.0;
int i;
x = __builtin_assume_aligned (x, 128);
if (n % 128)
__builtin_unreachable ();
for (i = 0; i < n; i++)
p += x[i];
return p;
}
/* { dg-final { scan-tree-dump-not "epilog loop required" "vect" } } */
/* { dg-final { cleanup-tree-dump "vect" } } */

4
gcc/tree-cfg.c
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@ -410,9 +410,9 @@ assert_unreachable_fallthru_edge_p (edge e)
if (gsi_end_p (gsi))
return false;
stmt = gsi_stmt (gsi);
if (is_gimple_debug (stmt))
while (is_gimple_debug (stmt) || gimple_clobber_p (stmt))
{
gsi_next_nondebug (&gsi);
gsi_next (&gsi);
if (gsi_end_p (gsi))
return false;
stmt = gsi_stmt (gsi);

9
gcc/tree-vrp.c
View File

@ -5423,12 +5423,9 @@ register_edge_assert_for_1 (tree op, enum tree_code code,
return false;
/* We know that OP will have a zero or nonzero value. If OP is used
more than once go ahead and register an assert for OP.
The FOUND_IN_SUBGRAPH support is not helpful in this situation as
it will always be set for OP (because OP is used in a COND_EXPR in
the subgraph). */
if (!has_single_use (op))
more than once go ahead and register an assert for OP. */
if (live_on_edge (e, op)
&& !has_single_use (op))
{
val = build_int_cst (TREE_TYPE (op), 0);
register_new_assert_for (op, op, code, val, NULL, e, bsi);