public inbox for gcc-cvs@sourceware.org
help / color / mirror / Atom feed
* [gcc r12-2946] Improve autoprefetcher heuristic (partly fix regression in PR91598)
@ 2021-08-17 10:12 Maxim Kuvyrkov
0 siblings, 0 replies; only message in thread
From: Maxim Kuvyrkov @ 2021-08-17 10:12 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:6d527883072ce96a33169036fca7740172223b52
commit r12-2946-g6d527883072ce96a33169036fca7740172223b52
Author: Maxim Kuvyrkov <maxim.kuvyrkov@linaro.org>
Date: Thu Aug 29 15:21:36 2019 +0000
Improve autoprefetcher heuristic (partly fix regression in PR91598)
PR rtl-optimization/91598
* haifa-sched.c (autopref_rank_for_schedule): Prioritize "irrelevant"
insns after memory reads and before memory writes.
Diff:
---
gcc/haifa-sched.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/gcc/haifa-sched.c b/gcc/haifa-sched.c
index 26d11279551..5048dd4a5a3 100644
--- a/gcc/haifa-sched.c
+++ b/gcc/haifa-sched.c
@@ -5683,9 +5683,16 @@ autopref_rank_for_schedule (const rtx_insn *insn1, const rtx_insn *insn2)
int irrel2 = data2->status == AUTOPREF_MULTIPASS_DATA_IRRELEVANT;
if (!irrel1 && !irrel2)
+ /* Sort memory references from lowest offset to the largest. */
r = data1->offset - data2->offset;
- else
+ else if (write)
+ /* Schedule "irrelevant" insns before memory stores to resolve
+ as many producer dependencies of stores as possible. */
r = irrel2 - irrel1;
+ else
+ /* Schedule "irrelevant" insns after memory reads to avoid breaking
+ memory read sequences. */
+ r = irrel1 - irrel2;
}
return r;
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2021-08-17 10:12 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-08-17 10:12 [gcc r12-2946] Improve autoprefetcher heuristic (partly fix regression in PR91598) Maxim Kuvyrkov
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).