From 8354d0abeb7646e109b2fb982afbc253644b0925 Mon Sep 17 00:00:00 2001 From: Richard Biener Date: Tue, 28 Jun 2022 12:07:14 +0200 Subject: [PATCH] Speedup loop splitting SSA update 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 * tree-ssa-loop-split.cc (fix_loop_bb_probability): Do not call update_ssa. --- gcc/tree-ssa-loop-split.cc | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/gcc/tree-ssa-loop-split.cc b/gcc/tree-ssa-loop-split.cc index d61bad5ba47..bccf621493b 100644 --- a/gcc/tree-ssa-loop-split.cc +++ b/gcc/tree-ssa-loop-split.cc @@ -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; }