From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by sourceware.org (Postfix) with ESMTPS id A3D793852759 for ; Mon, 18 Jul 2022 13:07:58 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org A3D793852759 Received: from mail-pj1-f72.google.com (mail-pj1-f72.google.com [209.85.216.72]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-615-a1xUUXSeNyueFyhGbtvckQ-1; Mon, 18 Jul 2022 09:07:55 -0400 X-MC-Unique: a1xUUXSeNyueFyhGbtvckQ-1 Received: by mail-pj1-f72.google.com with SMTP id k7-20020a17090a62c700b001ef9c16ba10so9518747pjs.1 for ; Mon, 18 Jul 2022 06:07:55 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=yTcVY3WeB2mSqZolF/fAO6VQiRLNQ5Dm5WT0HlV0S/8=; b=uTkld/IY/W1jaG+qRabFTpQc+dawKcRK3caH9GQGKORvmQgFJfqk6EJGEId7gBPmIu 0Ip7pKmDyHto/FPbXP/v+nfSfI75LJOMlDHFsbbJzBE+8R7TKXSvnyr7jy+nDdxD1DI4 igP4luQfC7BkSvwsme2whVzDF7HBH1RY5P5hBUtM62TPWDGzsHmQBqvyzZZ8Zc9SSYH5 OEVOF79QLrmqKj2YVNispbfomPvmcfISw8ubtCgFTS8CB4Xv4cxTvCC3hPGKyb3fYhv9 1lZyP3++QTCOBytNn3OyEEjKQDpfkGTf76Q7gbYgu/8Ps9JLRl2rzvVYzBW3sZO609Kv I+fg== X-Gm-Message-State: AJIora/fRCC1PrPNsEOhOpC2J3uD84yFrBFfrMB4BHs/gwKEPSdrFIf7 gDhpuFv4pbIv8x7ysMpTrd5+Xm/fNf1MD5m+So7GPcsf0EKitmWamzQjj9lktYJVN+GqbSZ6c2c X3WCPWlm6gKZltPDhQDWUoQHywXlmKw6P8A== X-Received: by 2002:a63:111a:0:b0:412:97c3:6907 with SMTP id g26-20020a63111a000000b0041297c36907mr24967588pgl.213.1658149674065; Mon, 18 Jul 2022 06:07:54 -0700 (PDT) X-Google-Smtp-Source: AGRyM1tFTFcG23jy2EO1V5OjEpf8M6b+qUT6l8OZOng00mxBp+KBcOhdO6OHP/zI6CkniM1/AVuR00sdaIYHOIGjBy8= X-Received: by 2002:a63:111a:0:b0:412:97c3:6907 with SMTP id g26-20020a63111a000000b0041297c36907mr24967560pgl.213.1658149673677; Mon, 18 Jul 2022 06:07:53 -0700 (PDT) MIME-Version: 1.0 References: <20220713192420.3126654-1-sfeifer@redhat.com> In-Reply-To: From: Sam Feifer Date: Mon, 18 Jul 2022 09:07:42 -0400 Message-ID: Subject: Re: [PATCH] match.pd: Add new abs pattern [PR94290] To: Andrew Pinski Cc: GCC Patches X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: multipart/mixed; boundary="00000000000048eca105e4140e0e" X-Spam-Status: No, score=-13.6 required=5.0 tests=BAYES_00, DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, HTML_MESSAGE, RCVD_IN_DNSWL_LOW, SPF_HELO_NONE, SPF_NONE, TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-Content-Filtered-By: Mailman/MimeDel 2.1.29 X-BeenThere: gcc-patches@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 18 Jul 2022 13:08:02 -0000 --00000000000048eca105e4140e0e Content-Type: text/plain; charset="UTF-8" Here's an updated version of the patch. Thanks -Sam On Thu, Jul 14, 2022 at 3:54 PM Andrew Pinski wrote: > On Thu, Jul 14, 2022 at 12:38 PM Sam Feifer wrote: > > > > > > > > On Thu, Jul 14, 2022 at 1:24 PM Andrew Pinski wrote: > >> > >> On Thu, Jul 14, 2022 at 7:09 AM Sam Feifer wrote: > >> > > >> > > >> > On Wed, Jul 13, 2022 at 3:36 PM Andrew Pinski > wrote: > >> >> > >> >> On Wed, Jul 13, 2022 at 12:26 PM Sam Feifer via Gcc-patches > >> >> wrote: > >> >> > > >> >> > This patch is intended to fix a missed optimization in match.pd. > It optimizes (x >= 0 ? x : 0) + (x <= 0 ? -x : 0) to just abs(x). I had to > write a second simplification in match.pd to handle the commutative > property as the match was not ocurring otherwise. Additionally, the pattern > (x <= 0 ? -x : 0) now gets optimized to max(-x, 0), which helps with the > other simplification rule. > >> >> > >> >> You could use :c for the commutative property instead and that should > >> >> simplify things. > >> >> That is: > >> >> > >> >> (simplify > >> >> (plus:c (max @0 integer_zerop) (max (negate @0) integer_zerop)) > >> >> (abs @0)) > >> >> > >> >> Also since integer_zerop works on vectors, it seems like you should > >> >> add a testcase or two for the vector case. > >> >> Also would be useful if you write a testcase that uses different > >> >> statements rather than one big one so it gets exercised in the > >> >> forwprop case. > >> >> Note also if either of the max are used more than just in this > >> >> simplification, it could increase the lifetime of @0, maybe you need > >> >> to add :s to the max expressions. > >> >> > >> > > >> > Thanks for the feedback. I'm not quite sure what a vector test case > would look like for this. Could I get some guidance on that? > >> > >> Yes this should produce the pattern at forwprop1 time (with the C++ > >> front-end, the C front-end does not support vector selects): > >> typedef int __attribute__((vector_size(4*sizeof(int)))) vint; > >> > >> vint foo(vint x) { > >> vint t = (x >= 0 ? x : 0) ; > >> vint xx = -x; > >> vint t1 = (xx >= 0 ? xx : 0); > >> return t + t1; > >> } > >> > >> int foo(int x) { > >> int t = (x >= 0 ? x : 0) ; > >> int xx = -x; > >> int t1 = (xx >= 0 ? xx : 0); > >> return t + t1; > >> } > >> > >> Thanks, > >> Andrew Pinski > >> > > > > Thanks for the help. I'm still having trouble with the vector test, > though. When I try to compile, I get an error saying "used vector type > where scalar is required", referring to the max expressions. How do I use > the max expression with two vectors as the inputs? > > As I mentioned it only works with the C++ front-end :). The C > front-end does not support ?: with vectors types. > > Thanks, > Andrew Pinski > > > > > Thanks > > -Sam > >> > >> > >> > > >> > Thanks > >> > -Sam > >> > > >> >> > >> >> Thanks, > >> >> Andrew > >> >> > >> >> > > >> >> > Tests are also included to be added to the testsuite. > >> >> > > >> >> > Bootstrapped/regtested on x86_64-pc-linux-gnu, ok for trunk? > >> >> > > >> >> > PR tree-optimization/94290 > >> >> > > >> >> > gcc/ChangeLog: > >> >> > > >> >> > * match.pd (x >= 0 ? x : 0) + (x <= 0 ? -x : 0): New > simplification. > >> >> > * match.pd (x <= 0 ? -x : 0): New Simplification. > >> >> > > >> >> > gcc/testsuite/ChangeLog: > >> >> > > >> >> > * gcc.c-torture/execute/pr94290-1.c: New test. > >> >> > * gcc.dg/pr94290-2.c: New test. > >> >> > * gcc.dg/pr94290.c: New test. > >> >> > --- > >> >> > gcc/match.pd | 15 ++++++ > >> >> > .../gcc.c-torture/execute/pr94290-1.c | 16 +++++++ > >> >> > gcc/testsuite/gcc.dg/pr94290-2.c | 15 ++++++ > >> >> > gcc/testsuite/gcc.dg/pr94290.c | 46 > +++++++++++++++++++ > >> >> > 4 files changed, 92 insertions(+) > >> >> > create mode 100644 gcc/testsuite/gcc.c-torture/execute/pr94290-1.c > >> >> > create mode 100644 gcc/testsuite/gcc.dg/pr94290-2.c > >> >> > create mode 100644 gcc/testsuite/gcc.dg/pr94290.c > >> >> > > >> >> > diff --git a/gcc/match.pd b/gcc/match.pd > >> >> > index 45aefd96688..55ca79d7ac9 100644 > >> >> > --- a/gcc/match.pd > >> >> > +++ b/gcc/match.pd > >> >> > @@ -7848,3 +7848,18 @@ and, > >> >> > (if (TYPE_UNSIGNED (TREE_TYPE (@0))) > >> >> > (bit_and @0 @1) > >> >> > (cond (le @0 @1) @0 (bit_and @0 @1)))))) > >> >> > + > >> >> > +/* (x >= 0 ? x : 0) + (x <= 0 ? -x : 0) -> abs x. */ > >> >> > +(simplify > >> >> > + (plus (max @0 integer_zerop) (max (negate @0) integer_zerop)) > >> >> > + (abs @0)) > >> >> > + > >> >> > +/* (x <= 0 ? -x : 0) + (x >= 0 ? x : 0) -> abs x. */ > >> >> > +(simplify > >> >> > + (plus (max (negate @0) integer_zerop) (max @0 integer_zerop) ) > >> >> > + (abs @0)) > >> >> > + > >> >> > +/* (x <= 0 ? -x : 0) -> max(-x, 0). */ > >> >> > +(simplify > >> >> > + (cond (le @0 integer_zerop@1) (negate @0) integer_zerop@1) > >> >> > + (max (negate @0) @1)) > >> >> > diff --git a/gcc/testsuite/gcc.c-torture/execute/pr94290-1.c > b/gcc/testsuite/gcc.c-torture/execute/pr94290-1.c > >> >> > new file mode 100644 > >> >> > index 00000000000..93b80d569aa > >> >> > --- /dev/null > >> >> > +++ b/gcc/testsuite/gcc.c-torture/execute/pr94290-1.c > >> >> > @@ -0,0 +1,16 @@ > >> >> > +/* PR tree-optimization/94290 */ > >> >> > + > >> >> > +#include "../../gcc.dg/pr94290.c" > >> >> > + > >> >> > +int main() { > >> >> > + > >> >> > + if (foo(0) != 0 > >> >> > + || foo(-42) != 42 > >> >> > + || foo(42) != 42 > >> >> > + || baz(-10) != 10 > >> >> > + || baz(-10) != 10) { > >> >> > + __builtin_abort(); > >> >> > + } > >> >> > + > >> >> > + return 0; > >> >> > +} > >> >> > diff --git a/gcc/testsuite/gcc.dg/pr94290-2.c > b/gcc/testsuite/gcc.dg/pr94290-2.c > >> >> > new file mode 100644 > >> >> > index 00000000000..ea6e55755f5 > >> >> > --- /dev/null > >> >> > +++ b/gcc/testsuite/gcc.dg/pr94290-2.c > >> >> > @@ -0,0 +1,15 @@ > >> >> > +/* PR tree-optimization/94290 */ > >> >> > +/* { dg-do compile } */ > >> >> > +/* { dg-options "-O2 -fdump-tree-optimized" } */ > >> >> > + > >> >> > +/* Form from PR. */ > >> >> > +__attribute__((noipa)) unsigned int foo(int x) { > >> >> > + return x <= 0 ? -x : 0; > >> >> > +} > >> >> > + > >> >> > +/* Changed order. */ > >> >> > +__attribute__((noipa)) unsigned int bar(int x) { > >> >> > + return 0 >= x ? -x : 0; > >> >> > +} > >> >> > + > >> >> > +/* { dg-final {scan-tree-dump-times " MAX_EXPR " 2 "optimized" } > } */ > >> >> > diff --git a/gcc/testsuite/gcc.dg/pr94290.c > b/gcc/testsuite/gcc.dg/pr94290.c > >> >> > new file mode 100644 > >> >> > index 00000000000..47617c36c02 > >> >> > --- /dev/null > >> >> > +++ b/gcc/testsuite/gcc.dg/pr94290.c > >> >> > @@ -0,0 +1,46 @@ > >> >> > +/* PR tree-optimization/94290 */ > >> >> > +/* { dg-do compile } */ > >> >> > +/* { dg-options "-O2 -fdump-tree-optimized" } */ > >> >> > + > >> >> > + > >> >> > +/* Same form as PR. */ > >> >> > +__attribute__((noipa)) unsigned int foo(int x) { > >> >> > + return (x >= 0 ? x : 0) + (x <= 0 ? -x : 0); > >> >> > +} > >> >> > + > >> >> > +/* Signed function. */ > >> >> > +__attribute__((noipa)) int bar(int x) { > >> >> > + return (x >= 0 ? x : 0) + (x <= 0 ? -x : 0); > >> >> > +} > >> >> > + > >> >> > +/* Commutative property. */ > >> >> > +__attribute__((noipa)) unsigned int baz(int x) { > >> >> > + return (x <= 0 ? -x : 0) + (x >= 0 ? x : 0); > >> >> > +} > >> >> > + > >> >> > +/* Flipped order for max expressions. */ > >> >> > +__attribute__((noipa)) unsigned int quux(int x) { > >> >> > + return (0 <= x ? x : 0) + (0 >= x ? -x : 0); > >> >> > +} > >> >> > + > >> >> > +/* Not zero so should not optimize. */ > >> >> > +__attribute__((noipa)) unsigned int waldo(int x) { > >> >> > + return (x >= 4 ? x : 4) + (x <= 4 ? -x : 4); > >> >> > +} > >> >> > + > >> >> > +/* Not zero so should not optimize. */ > >> >> > +__attribute__((noipa)) unsigned int fred(int x) { > >> >> > + return (x >= -4 ? x : -4) + (x <= -4 ? -x : -4); > >> >> > +} > >> >> > + > >> >> > +/* Incorrect pattern. */ > >> >> > +__attribute__((noipa)) unsigned int goo(int x) { > >> >> > + return (x <= 0 ? x : 0) + (x >= 0 ? -x : 0); > >> >> > +} > >> >> > + > >> >> > +/* Incorrect pattern. */ > >> >> > +__attribute__((noipa)) int qux(int x) { > >> >> > + return (x >= 0 ? x : 0) + (x >= 0 ? x : 0); > >> >> > +} > >> >> > + > >> >> > +/* { dg-final {scan-tree-dump-times " ABS_EXPR " 4 "optimized" } > } */ > >> >> > > >> >> > base-commit: 6af530f914801f5e561057da55c41480f28751f7 > >> >> > -- > >> >> > 2.31.1 > >> >> > > >> >> > >> > > --00000000000048eca105e4140e0e Content-Type: text/x-patch; charset="US-ASCII"; name="0001-match.pd-Add-new-abs-pattern-PR94290.patch" Content-Disposition: attachment; filename="0001-match.pd-Add-new-abs-pattern-PR94290.patch" 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