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tree-parloops.c (loop_has_blocks_with_irreducible_flag): New.

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2008-01-12  Sebastian Pop  <sebastian.pop@amd.com>

	* tree-parloops.c (loop_has_blocks_with_irreducible_flag): New.
	(parallelize_loops): Don't parallelize irreducible components.

From-SVN: r131561
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Sebastian Pop 2008-01-16 02:44:04 +00:00 committed by Sebastian Pop
parent 8c87e2452f
commit 1d4af1e827
2 changed files with 26 additions and 0 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2008-01-12 Sebastian Pop <sebastian.pop@amd.com>
* tree-parloops.c (loop_has_blocks_with_irreducible_flag): New.
(parallelize_loops): Don't parallelize irreducible components.
2008-01-14 Manuel Lopez-Ibanez <manu@gcc.gnu.org>
PR c++/24924

21
gcc/tree-parloops.c
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@ -431,6 +431,26 @@ loop_parallel_p (struct loop *loop, htab_t reduction_list, struct tree_niter_des
return ret;
}
/* Return true when LOOP contains basic blocks marked with the
BB_IRREDUCIBLE_LOOP flag. */
static inline bool
loop_has_blocks_with_irreducible_flag (struct loop *loop)
{
unsigned i;
basic_block *bbs = get_loop_body_in_dom_order (loop);
bool res = true;
for (i = 0; i < loop->num_nodes; i++)
if (bbs[i]->flags & BB_IRREDUCIBLE_LOOP)
goto end;
res = false;
end:
free (bbs);
return res;
}
/* Assigns the address of OBJ in TYPE to an ssa name, and returns this name.
The assignment statement is placed before LOOP. DECL_ADDRESS maps decls
to their addresses that can be reused. The address of OBJ is known to
@ -1741,6 +1761,7 @@ parallelize_loops (void)
|| expected_loop_iterations (loop) <= n_threads
/* And of course, the loop must be parallelizable. */
|| !can_duplicate_loop_p (loop)
|| loop_has_blocks_with_irreducible_flag (loop)
|| !loop_parallel_p (loop, reduction_list, &niter_desc))
continue;