From 6d527883072ce96a33169036fca7740172223b52 Mon Sep 17 00:00:00 2001 From: Maxim Kuvyrkov Date: Thu, 29 Aug 2019 15:21:36 +0000 Subject: 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. --- gcc/haifa-sched.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) (limited to 'gcc/haifa-sched.c') diff --git a/gcc/haifa-sched.c b/gcc/haifa-sched.c index 26d1127..5048dd4 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; -- cgit v1.1