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Speedup loop splitting SSA update

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Since we never process loops with inner loops that have been split
we can delay SSA update until after the pass is done with the whole
loop, avoiding the O(function-size) work associated with it.

2022-06-28  Richard Biener  <rguenther@suse.de>

	* tree-ssa-loop-split.cc (fix_loop_bb_probability): Do not
	call update_ssa.
This commit is contained in:
Richard Biener 2022-06-28 12:07:14 +02:00
parent 07f49e855b
commit 8354d0abeb
1 changed files with 2 additions and 3 deletions
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5
gcc/tree-ssa-loop-split.cc
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@ -491,8 +491,6 @@ static void
fix_loop_bb_probability (class loop *loop1, class loop *loop2, edge true_edge,
edge false_edge)
{
update_ssa (TODO_update_ssa);
/* Proportion first loop's bb counts except those dominated by true
branch to avoid drop 1s down. */
basic_block *bbs1, *bbs2;
@ -1668,7 +1666,8 @@ tree_ssa_split_loops (void)
if (loop->aux)
{
/* If any of our inner loops was split, don't split us,
and mark our containing loop as having had splits as well. */
and mark our containing loop as having had splits as well.
This allows for delaying SSA update. */
loop_outer (loop)->aux = loop;
continue;
}