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[209.132.180.131]) by mx.google.com with ESMTPS id 87si212520pfh.330.2018.01.22.05.46.59 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 22 Jan 2018 05:46:59 -0800 (PST) Received-SPF: pass (google.com: domain of gcc-patches-return-471793-patch=linaro.org@gcc.gnu.org designates 209.132.180.131 as permitted sender) client-ip=209.132.180.131; Authentication-Results: mx.google.com; dkim=pass header.i=@gcc.gnu.org header.s=default header.b=Bt1UbKgM; spf=pass (google.com: domain of gcc-patches-return-471793-patch=linaro.org@gcc.gnu.org designates 209.132.180.131 as permitted sender) smtp.mailfrom=gcc-patches-return-471793-patch=linaro.org@gcc.gnu.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=linaro.org DomainKey-Signature: a=rsa-sha1; c=nofws; d=gcc.gnu.org; h=list-id :list-unsubscribe:list-archive:list-post:list-help:sender:from :to:cc:subject:date:message-id:in-reply-to:references; q=dns; s= default; b=I1kTO53IsAu1BWSjbRUOkAKZGjvwZwO9oTr78qkiwglsDPp5fnf4+ C92P/OnAA8IYLUaa1RaNdwoC2zAoe7tcatmZvo3XIpo2P5zrMNVnk1qcm9SblYAh AnSKDipNZ/fLahO5sZGlRnLiYmXPoYtSdPUCdAjTWY8WloUtP1oOLo= DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=gcc.gnu.org; h=list-id :list-unsubscribe:list-archive:list-post:list-help:sender:from :to:cc:subject:date:message-id:in-reply-to:references; s= default; bh=7lH8llLCx3H4w+DLsmO8jWwm06c=; b=Bt1UbKgMpJTwirKeZHR9 59o27qKdLOy27yiQEasIRAtMCe6MZl4TGEFiUsxrSV61WEaZu/nT7gr4Q7vIw2Yq CTcCLnZGCgtOnIMbmWiaqtyIcGbepaOdDYHeyLhH2OZLOnuro5JG0ou8xePYsGyG skCLWrU73q0hrVrE4oCiwVk= Received: (qmail 1614 invoked by alias); 22 Jan 2018 13:46:40 -0000 Mailing-List: contact gcc-patches-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Unsubscribe: List-Archive: List-Post: List-Help: Sender: gcc-patches-owner@gcc.gnu.org Delivered-To: mailing list gcc-patches@gcc.gnu.org Received: (qmail 1474 invoked by uid 89); 22 Jan 2018 13:46:39 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-26.9 required=5.0 tests=BAYES_00, GIT_PATCH_0, GIT_PATCH_1, GIT_PATCH_2, GIT_PATCH_3, RCVD_IN_DNSWL_NONE, SPF_PASS autolearn=ham version=3.3.2 spammy=Luis, 5566, prefetching, Minimum X-HELO: mail-qt0-f193.google.com Received: from mail-qt0-f193.google.com (HELO mail-qt0-f193.google.com) (209.85.216.193) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with ESMTP; Mon, 22 Jan 2018 13:46:36 +0000 Received: by mail-qt0-f193.google.com with SMTP id x27so20763181qtm.12 for ; Mon, 22 Jan 2018 05:46:36 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=jl2S8FU/+oxcWNuBAz7/kUjjoxNG6Gsi02dd7lykxjI=; b=lPLOEvmW3TjSW5+zyNXq15ZJYvIFu3SOlO3CHPnhcZWvcGeHN8cZY00KYq6hJuFutT /5GxbfxgU9Lm7CQPApZiMpNBQQgnGI7JSxqMSZyUqDATrNTcRSimvhZvC0Qh714Swxpw rrqpcD/KNboQAGnCv6t/EH6Ad1o+LBPxJ/p3GRcUhBP1CW98vinHLfCwvW/UsQ5lS5FM hMZDH1ewSA0jpH7NOEelNkcmkbyWA/y1sUL3p8D1EFppF8HETERiHHXQS5gSt8H/Prlk l0+LdL1LnT7h6/orKYMpFGh+eiM1iO6tjq9BnN/uQoJnLJO3rORqdp1VMb1hOpV78e78 c3bg== X-Gm-Message-State: AKwxytdrAZnCp+LFJJyfwigSte2iqkRUlK7NNS92pgLQKsTutMqjEazY wX4xRzrqvh0Ljmlf/elEHfNVpdgalMM= X-Received: by 10.55.132.2 with SMTP id g2mr2315719qkd.131.1516628794747; Mon, 22 Jan 2018 05:46:34 -0800 (PST) Received: from localhost.localdomain ([177.180.105.91]) by smtp.gmail.com with ESMTPSA id s39sm10492452qth.67.2018.01.22.05.46.32 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 22 Jan 2018 05:46:33 -0800 (PST) From: Luis Machado To: gcc-patches@gcc.gnu.org Cc: james.greenhalgh@arm.com, Richard.Earnshaw@arm.com Subject: [PATCH 1/2] Introduce prefetch-minimum stride option Date: Mon, 22 Jan 2018 11:46:09 -0200 Message-Id: <1516628770-25036-2-git-send-email-luis.machado@linaro.org> In-Reply-To: <1516628770-25036-1-git-send-email-luis.machado@linaro.org> References: <1516628770-25036-1-git-send-email-luis.machado@linaro.org> X-IsSubscribed: yes This patch adds a new option to control the minimum stride, for a memory reference, after which the loop prefetch pass may issue software prefetch hints for. There are two motivations: * Make the pass less aggressive, only issuing prefetch hints for bigger strides that are more likely to benefit from prefetching. I've noticed a case in cpu2017 where we were issuing thousands of hints, for example. * For processors that have a hardware prefetcher, like Falkor, it allows the loop prefetch pass to defer prefetching of smaller (less than the threshold) strides to the hardware prefetcher instead. This prevents conflicts between the software prefetcher and the hardware prefetcher. I've noticed considerable reduction in the number of prefetch hints and slightly positive performance numbers. This aligns GCC and LLVM in terms of prefetch behavior for Falkor. The default settings should guarantee no changes for existing targets. Those are free to tweak the settings as necessary. No regressions in the testsuite and bootstrapped ok on aarch64-linux. Ok? 2018-01-22 Luis Machado Introduce option to limit software prefetching to known constant strides above a specific threshold with the goal of preventing conflicts with a hardware prefetcher. gcc/ * config/aarch64/aarch64-protos.h (cpu_prefetch_tune) : New const int field. * config/aarch64/aarch64.c (generic_prefetch_tune): Update to include minimum_stride field. (exynosm1_prefetch_tune): Likewise. (thunderxt88_prefetch_tune): Likewise. (thunderx_prefetch_tune): Likewise. (thunderx2t99_prefetch_tune): Likewise. (qdf24xx_prefetch_tune): Likewise. Set minimum_stride to 2048. (aarch64_override_options_internal): Update to set PARAM_PREFETCH_MINIMUM_STRIDE. * doc/invoke.texi (prefetch-minimum-stride): Document new option. * params.def (PARAM_PREFETCH_MINIMUM_STRIDE): New. * params.h (PARAM_PREFETCH_MINIMUM_STRIDE): Define. * tree-ssa-loop-prefetch.c (should_issue_prefetch_p): Return false if stride is constant and is below the minimum stride threshold. --- gcc/config/aarch64/aarch64-protos.h | 3 +++ gcc/config/aarch64/aarch64.c | 13 ++++++++++++- gcc/doc/invoke.texi | 15 +++++++++++++++ gcc/params.def | 9 +++++++++ gcc/params.h | 2 ++ gcc/tree-ssa-loop-prefetch.c | 16 ++++++++++++++++ 6 files changed, 57 insertions(+), 1 deletion(-) -- 2.7.4 diff --git a/gcc/config/aarch64/aarch64-protos.h b/gcc/config/aarch64/aarch64-protos.h index ef1b0bc..8736bd9 100644 --- a/gcc/config/aarch64/aarch64-protos.h +++ b/gcc/config/aarch64/aarch64-protos.h @@ -230,6 +230,9 @@ struct cpu_prefetch_tune const int l1_cache_size; const int l1_cache_line_size; const int l2_cache_size; + /* The minimum constant stride beyond which we should use prefetch + hints for. */ + const int minimum_stride; const int default_opt_level; }; diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c index 174310c..0ed9f14 100644 --- a/gcc/config/aarch64/aarch64.c +++ b/gcc/config/aarch64/aarch64.c @@ -547,6 +547,7 @@ static const cpu_prefetch_tune generic_prefetch_tune = -1, /* l1_cache_size */ -1, /* l1_cache_line_size */ -1, /* l2_cache_size */ + -1, /* minimum_stride */ -1 /* default_opt_level */ }; @@ -556,6 +557,7 @@ static const cpu_prefetch_tune exynosm1_prefetch_tune = -1, /* l1_cache_size */ 64, /* l1_cache_line_size */ -1, /* l2_cache_size */ + -1, /* minimum_stride */ -1 /* default_opt_level */ }; @@ -565,7 +567,8 @@ static const cpu_prefetch_tune qdf24xx_prefetch_tune = 32, /* l1_cache_size */ 64, /* l1_cache_line_size */ 1024, /* l2_cache_size */ - -1 /* default_opt_level */ + 2048, /* minimum_stride */ + 3 /* default_opt_level */ }; static const cpu_prefetch_tune thunderxt88_prefetch_tune = @@ -574,6 +577,7 @@ static const cpu_prefetch_tune thunderxt88_prefetch_tune = 32, /* l1_cache_size */ 128, /* l1_cache_line_size */ 16*1024, /* l2_cache_size */ + -1, /* minimum_stride */ 3 /* default_opt_level */ }; @@ -583,6 +587,7 @@ static const cpu_prefetch_tune thunderx_prefetch_tune = 32, /* l1_cache_size */ 128, /* l1_cache_line_size */ -1, /* l2_cache_size */ + -1, /* minimum_stride */ -1 /* default_opt_level */ }; @@ -592,6 +597,7 @@ static const cpu_prefetch_tune thunderx2t99_prefetch_tune = 32, /* l1_cache_size */ 64, /* l1_cache_line_size */ 256, /* l2_cache_size */ + -1, /* minimum_stride */ -1 /* default_opt_level */ }; @@ -10461,6 +10467,11 @@ aarch64_override_options_internal (struct gcc_options *opts) aarch64_tune_params.prefetch->l2_cache_size, opts->x_param_values, global_options_set.x_param_values); + if (aarch64_tune_params.prefetch->minimum_stride >= 0) + maybe_set_param_value (PARAM_PREFETCH_MINIMUM_STRIDE, + aarch64_tune_params.prefetch->minimum_stride, + opts->x_param_values, + global_options_set.x_param_values); /* Use the alternative scheduling-pressure algorithm by default. */ maybe_set_param_value (PARAM_SCHED_PRESSURE_ALGORITHM, SCHED_PRESSURE_MODEL, diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 27c5974..1cb1ef5 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -10567,6 +10567,21 @@ The size of L1 cache, in kilobytes. @item l2-cache-size The size of L2 cache, in kilobytes. +@item prefetch-minimum-stride +Minimum constant stride, in bytes, to start using prefetch hints for. If +the stride is less than this threshold, prefetch hints will not be issued. + +This setting is useful for processors that have hardware prefetchers, in +which case there may be conflicts between the hardware prefetchers and +the software prefetchers. If the hardware prefetchers have a maximum +stride they can handle, it should be used here to improve the use of +software prefetchers. + +A value of -1, the default, means we don't have a threshold and therefore +prefetch hints can be issued for any constant stride. + +This setting is only useful for strides that are known and constant. + @item loop-interchange-max-num-stmts The maximum number of stmts in a loop to be interchanged. diff --git a/gcc/params.def b/gcc/params.def index 930b318..bf2d12c 100644 --- a/gcc/params.def +++ b/gcc/params.def @@ -790,6 +790,15 @@ DEFPARAM (PARAM_L2_CACHE_SIZE, "The size of L2 cache.", 512, 0, 0) +/* The minimum constant stride beyond which we should use prefetch hints + for. */ + +DEFPARAM (PARAM_PREFETCH_MINIMUM_STRIDE, + "prefetch-minimum-stride", + "The minimum constant stride beyond which we should use prefetch " + "hints for.", + -1, 0, 0) + /* Maximum number of statements in loop nest for loop interchange. */ DEFPARAM (PARAM_LOOP_INTERCHANGE_MAX_NUM_STMTS, diff --git a/gcc/params.h b/gcc/params.h index 98249d2..96012db 100644 --- a/gcc/params.h +++ b/gcc/params.h @@ -196,6 +196,8 @@ extern void init_param_values (int *params); PARAM_VALUE (PARAM_L1_CACHE_LINE_SIZE) #define L2_CACHE_SIZE \ PARAM_VALUE (PARAM_L2_CACHE_SIZE) +#define PREFETCH_MINIMUM_STRIDE \ + PARAM_VALUE (PARAM_PREFETCH_MINIMUM_STRIDE) #define USE_CANONICAL_TYPES \ PARAM_VALUE (PARAM_USE_CANONICAL_TYPES) #define IRA_MAX_LOOPS_NUM \ diff --git a/gcc/tree-ssa-loop-prefetch.c b/gcc/tree-ssa-loop-prefetch.c index 2f10db1..112ccac 100644 --- a/gcc/tree-ssa-loop-prefetch.c +++ b/gcc/tree-ssa-loop-prefetch.c @@ -992,6 +992,22 @@ prune_by_reuse (struct mem_ref_group *groups) static bool should_issue_prefetch_p (struct mem_ref *ref) { + /* Some processors may have a hardware prefetcher that may conflict with + prefetch hints for a range of strides. Make sure we don't issue + prefetches for such cases if the stride is within this particular + range. */ + if (cst_and_fits_in_hwi (ref->group->step) + && absu_hwi (int_cst_value (ref->group->step)) < PREFETCH_MINIMUM_STRIDE) + { + if (dump_file && (dump_flags & TDF_DETAILS)) + fprintf (dump_file, + "Step for reference %u:%u (%d) is less than the mininum " + " required stride of %d\n", + ref->group->uid, ref->uid, int_cst_value (ref->group->step), + PREFETCH_MINIMUM_STRIDE); + return false; + } + /* For now do not issue prefetches for only first few of the iterations. */ if (ref->prefetch_before != PREFETCH_ALL)