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 [170.10.133.124]) by sourceware.org (Postfix) with ESMTPS id 558BE385771F for ; Wed, 12 Jul 2023 21:15:45 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 558BE385771F Authentication-Results: sourceware.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=redhat.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1689196544; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=pQMdigtzIaOoILm1IUhkGXhAz5LMnGlM9fgQTGEx/18=; b=KZM4//yEXuWoebYJuLiDBXvb9DbpIAbMMaZa0mZYvxDBsPTMkc7LHMyuZF38+nzPsw5FOk OnFSJZxLvFy6Bl1sNQK+R4FrqabyVi4+YA7eBSjblJxpvyNv9XL2isYgo9WLGnMaOt5Gkr vsjdJOcdSt806knf12BM51FNaiNi5ow= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-474-7LTuhu5KNnOS4q9o9zKcgg-1; Wed, 12 Jul 2023 17:15:43 -0400 X-MC-Unique: 7LTuhu5KNnOS4q9o9zKcgg-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.rdu2.redhat.com [10.11.54.4]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 25C0D185A7AB for ; Wed, 12 Jul 2023 21:15:43 +0000 (UTC) Received: from abulafia.lan (unknown [10.39.192.61]) by smtp.corp.redhat.com (Postfix) with ESMTPS id C370D2017D0A; Wed, 12 Jul 2023 21:15:42 +0000 (UTC) Received: from abulafia.lan (localhost [127.0.0.1]) by abulafia.lan (8.17.1/8.17.1) with ESMTPS id 36CLFeWp065912 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NOT); Wed, 12 Jul 2023 23:15:40 +0200 Received: (from aldyh@localhost) by abulafia.lan (8.17.1/8.17.1/Submit) id 36CLFe8r065911; Wed, 12 Jul 2023 23:15:40 +0200 From: Aldy Hernandez To: GCC patches Cc: Andrew MacLeod , Aldy Hernandez Subject: [COMMITTED] [range-op] Take known mask into account for bitwise ands [PR107043] Date: Wed, 12 Jul 2023 23:15:29 +0200 Message-Id: <20230712211528.65888-2-aldyh@redhat.com> In-Reply-To: <20230712211528.65888-1-aldyh@redhat.com> References: <20230712211528.65888-1-aldyh@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.4 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset="US-ASCII"; x-default=true X-Spam-Status: No, score=-11.4 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,GIT_PATCH_0,RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H4,RCVD_IN_MSPIKE_WL,SPF_HELO_NONE,SPF_NONE,TXREP,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: PR tree-optimization/107043 gcc/ChangeLog: * range-op.cc (operator_bitwise_and::op1_range): Update bitmask. gcc/testsuite/ChangeLog: * gcc.dg/tree-ssa/pr107043.c: New test. --- gcc/range-op.cc | 8 ++++++++ gcc/testsuite/gcc.dg/tree-ssa/pr107043.c | 22 ++++++++++++++++++++++ 2 files changed, 30 insertions(+) create mode 100644 gcc/testsuite/gcc.dg/tree-ssa/pr107043.c diff --git a/gcc/range-op.cc b/gcc/range-op.cc index 56e80c9f3ae..6b5d4f2accd 100644 --- a/gcc/range-op.cc +++ b/gcc/range-op.cc @@ -3463,6 +3463,14 @@ operator_bitwise_and::op1_range (irange &r, tree type, if (r.undefined_p ()) set_nonzero_range_from_mask (r, type, lhs); + // For MASK == op1 & MASK, all the bits in MASK must be set in op1. + wide_int mask; + if (lhs == op2 && lhs.singleton_p (mask)) + { + r.update_bitmask (irange_bitmask (mask, ~mask)); + return true; + } + // For 0 = op1 & MASK, op1 is ~MASK. if (lhs.zero_p () && op2.singleton_p ()) { diff --git a/gcc/testsuite/gcc.dg/tree-ssa/pr107043.c b/gcc/testsuite/gcc.dg/tree-ssa/pr107043.c new file mode 100644 index 00000000000..af5df225746 --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/pr107043.c @@ -0,0 +1,22 @@ +// { dg-do compile } +// { dg-options "-O2 -fdump-tree-evrp" } + +int g0(int n) +{ + int n1 = n & 0x8000; + if (n1 == 0) + return 1; + // n1 will be 0x8000 here. + return (n1 >> 15) & 0x1; +} + +int g1(int n) +{ + int n1 = n & 0x8000; + if (n1 == 0) + return 1; + // n>>15 will be xxxxxx1 here. + return (n >> 15) & 0x1; +} + +// { dg-final { scan-tree-dump-times "return 1;" 2 "evrp" } } -- 2.40.1