From: Wilco Dijkstra <Wilco.Dijkstra@arm.com>
To: GCC Patches <gcc-patches@gcc.gnu.org>,
James Greenhalgh <James.Greenhalgh@arm.com>
Cc: nd <nd@arm.com>
Subject: Re: [PATCH][AArch64] Enable AUTOPREFETCHER_WEAK with -mcpu=generic
Date: Thu, 20 Apr 2017 15:53:00 -0000 [thread overview]
Message-ID: <AM5PR0802MB2610F901D19DABDE93159873831B0@AM5PR0802MB2610.eurprd08.prod.outlook.com> (raw)
In-Reply-To: <AM5PR0802MB26108A29134FE37A5335A38F830A0@AM5PR0802MB2610.eurprd08.prod.outlook.com>
ping
From: Wilco Dijkstra
Sent: 05 April 2017 13:38
To: GCC Patches
Cc: nd; James Greenhalgh; Andrew.pinski@cavium.com; Evandro Menezes; jim.wilson@linaro.org
Subject: [PATCH][AArch64] Enable AUTOPREFETCHER_WEAK with -mcpu=generic
Many supported cores use the AUTOPREFETCHER_WEAK setting which tries
to order loads and stores to improve streaming performance. Since significant
gains were reported in http://patchwork.ozlabs.org/patch/534469/ it seems
like a good idea to enable this setting too for -mcpu=generic. Since the
weak model only keeps the order if it doesn't make the schedule worse, it
should not impact performance adversely on cores that don't show a gain.
Any objections?
ChangeLog:
2017-04-05 Wilco Dijkstra <wdijkstr@arm.com>
* gcc/config/aarch64/aarch64.c (generic_tunings): Update prefetch model.
--
diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c
index 8b729b1b1f87316e940d7fc657f235a935ffa93e..b249ce2b310707c7ded2827d505ce2ddfcfbf976 100644
--- a/gcc/config/aarch64/aarch64.c
+++ b/gcc/config/aarch64/aarch64.c
@@ -547,7 +547,7 @@ static const struct tune_params generic_tunings =
2, /* min_div_recip_mul_df. */
0, /* max_case_values. */
0, /* cache_line_size. */
- tune_params::AUTOPREFETCHER_OFF, /* autoprefetcher_model. */
+ tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */
(AARCH64_EXTRA_TUNE_NONE) /* tune_flags. */
};
next prev parent reply other threads:[~2017-04-20 15:41 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-05 12:38 Wilco Dijkstra
2017-04-05 16:17 ` Andrew Pinski
2017-04-05 16:44 ` Jim Wilson
2017-04-20 15:53 ` Wilco Dijkstra [this message]
2017-05-04 10:29 ` Richard Earnshaw (lists)
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