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tree-ssa-loop-ivcanon.c (try_unroll_loop_completely): Remove unused edges after loop duplication.

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2007-11-14  Sebastian Pop  <sebastian.pop@amd.com>

	* tree-ssa-loop-ivcanon.c (try_unroll_loop_completely): Remove
	unused edges after loop duplication.

From-SVN: r130182
This commit is contained in:
Sebastian Pop 2007-11-14 17:36:01 +00:00 committed by Sebastian Pop
parent 1e992e163d
commit 6c74788ed7
2 changed files with 22 additions and 23 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2007-11-14 Sebastian Pop <sebastian.pop@amd.com>
* tree-ssa-loop-ivcanon.c (try_unroll_loop_completely): Remove
unused edges after loop duplication.
2007-11-14 Uros Bizjak <ubizjak@gmail.com>
* config/i386/i386.h (TARGET_CPU_DEFAULT_*): Substitute with ...

40
gcc/tree-ssa-loop-ivcanon.c
View File

@ -163,7 +163,7 @@ try_unroll_loop_completely (struct loop *loop,
enum unroll_level ul)
{
unsigned HOST_WIDE_INT n_unroll, ninsns, max_unroll, unr_insns;
tree old_cond, cond, dont_exit, do_exit;
tree cond;
if (loop->inner)
return false;
@ -207,50 +207,44 @@ try_unroll_loop_completely (struct loop *loop,
}
}
if (exit->flags & EDGE_TRUE_VALUE)
{
dont_exit = boolean_false_node;
do_exit = boolean_true_node;
}
else
{
dont_exit = boolean_true_node;
do_exit = boolean_false_node;
}
cond = last_stmt (exit->src);
if (n_unroll)
{
sbitmap wont_exit;
edge e;
unsigned i;
VEC (edge, heap) *to_remove = NULL;
old_cond = COND_EXPR_COND (cond);
COND_EXPR_COND (cond) = dont_exit;
update_stmt (cond);
initialize_original_copy_tables ();
wont_exit = sbitmap_alloc (n_unroll + 1);
sbitmap_ones (wont_exit);
RESET_BIT (wont_exit, 0);
if (!tree_duplicate_loop_to_header_edge (loop, loop_preheader_edge (loop),
n_unroll, wont_exit,
exit, NULL,
exit, &to_remove,
DLTHE_FLAG_UPDATE_FREQ
| DLTHE_FLAG_COMPLETTE_PEEL))
{
COND_EXPR_COND (cond) = old_cond;
update_stmt (cond);
free_original_copy_tables ();
free (wont_exit);
return false;
}
for (i = 0; VEC_iterate (edge, to_remove, i, e); i++)
{
bool ok = remove_path (e);
gcc_assert (ok);
}
VEC_free (edge, heap, to_remove);
free (wont_exit);
free_original_copy_tables ();
}
COND_EXPR_COND (cond) = do_exit;
update_stmt (cond);
cond = last_stmt (exit->src);
COND_EXPR_COND (cond) = (exit->flags & EDGE_TRUE_VALUE) ? boolean_true_node
: boolean_false_node;
update_stmt (cond);
update_ssa (TODO_update_ssa);
if (dump_file && (dump_flags & TDF_DETAILS))