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* [gcc r14-2815] Remove recursive post-dominator traversal in sinking
@ 2023-07-27 9:32 Richard Biener
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From: Richard Biener @ 2023-07-27 9:32 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:e7cda6ef77d65839a21a0160cb0a81aa0cc5a7dc
commit r14-2815-ge7cda6ef77d65839a21a0160cb0a81aa0cc5a7dc
Author: Richard Biener <rguenther@suse.de>
Date: Thu Jul 27 10:23:16 2023 +0200
Remove recursive post-dominator traversal in sinking
The following turns the recursive post-dominator traversal in GIMPLE
code sinking to a worklist.
* tree-ssa-sink.cc (sink_code_in_bb): Remove recursion, instead
use a worklist ...
(pass_sink_code::execute): ... in the caller.
Diff:
---
gcc/tree-ssa-sink.cc | 27 ++++++++++++++++-----------
1 file changed, 16 insertions(+), 11 deletions(-)
diff --git a/gcc/tree-ssa-sink.cc b/gcc/tree-ssa-sink.cc
index b1ba7a2ad6c..cf0a32a954b 100644
--- a/gcc/tree-ssa-sink.cc
+++ b/gcc/tree-ssa-sink.cc
@@ -671,7 +671,6 @@ sink_common_stores_to_bb (basic_block bb)
static unsigned
sink_code_in_bb (basic_block bb)
{
- basic_block son;
gimple_stmt_iterator gsi;
edge_iterator ei;
edge e;
@@ -684,12 +683,12 @@ sink_code_in_bb (basic_block bb)
/* If this block doesn't dominate anything, there can't be any place to sink
the statements to. */
if (first_dom_son (CDI_DOMINATORS, bb) == NULL)
- goto earlyout;
+ return todo;
/* We can't move things across abnormal edges, so don't try. */
FOR_EACH_EDGE (e, ei, bb->succs)
if (e->flags & EDGE_ABNORMAL)
- goto earlyout;
+ return todo;
for (gsi = gsi_last_bb (bb); !gsi_end_p (gsi);)
{
@@ -763,13 +762,6 @@ sink_code_in_bb (basic_block bb)
gsi_prev (&gsi);
}
- earlyout:
- for (son = first_dom_son (CDI_POST_DOMINATORS, bb);
- son;
- son = next_dom_son (CDI_POST_DOMINATORS, son))
- {
- todo |= sink_code_in_bb (son);
- }
return todo;
}
@@ -859,7 +851,20 @@ pass_sink_code::execute (function *fun)
memset (&sink_stats, 0, sizeof (sink_stats));
calculate_dominance_info (CDI_DOMINATORS);
calculate_dominance_info (CDI_POST_DOMINATORS);
- todo |= sink_code_in_bb (EXIT_BLOCK_PTR_FOR_FN (fun));
+
+ auto_vec<basic_block, 64> worklist;
+ worklist.quick_push (EXIT_BLOCK_PTR_FOR_FN (fun));
+ do
+ {
+ basic_block bb = worklist.pop ();
+ todo |= sink_code_in_bb (bb);
+ for (basic_block son = first_dom_son (CDI_POST_DOMINATORS, bb);
+ son;
+ son = next_dom_son (CDI_POST_DOMINATORS, son))
+ worklist.safe_push (son);
+ }
+ while (!worklist.is_empty ());
+
statistics_counter_event (fun, "Sunk statements", sink_stats.sunk);
statistics_counter_event (fun, "Commoned stores", sink_stats.commoned);
free_dominance_info (CDI_POST_DOMINATORS);
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