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Fri, 11 Nov 2022 18:47:06 +0000 Date: Fri, 11 Nov 2022 18:43:05 +0000 From: Andrew Carlotti To: gcc-patches@gcc.gnu.org Subject: [PATCH 4/8] Modify test, to prevent the next patch breaking it Message-ID: References: Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-ClientProxiedBy: LO4P123CA0046.GBRP123.PROD.OUTLOOK.COM (2603:10a6:600:152::15) To PAXPR08MB6686.eurprd08.prod.outlook.com (2603:10a6:102:13e::8) MIME-Version: 1.0 X-MS-TrafficTypeDiagnostic: PAXPR08MB6686:EE_|DB9PR08MB7511:EE_|DBAEUR03FT056:EE_|GVXPR08MB8234:EE_ X-MS-Office365-Filtering-Correlation-Id: e87a7734-daa4-4e57-75cc-08dac4152780 x-checkrecipientrouted: true NoDisclaimer: true X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam-Untrusted: BCL:0; X-Microsoft-Antispam-Message-Info-Original: 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 X-Forefront-Antispam-Report-Untrusted: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:PAXPR08MB6686.eurprd08.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230022)(4636009)(366004)(396003)(346002)(376002)(39860400002)(136003)(451199015)(66476007)(66946007)(66556008)(6916009)(84970400001)(8676002)(186003)(316002)(478600001)(2906002)(44832011)(8936002)(41300700001)(5660300002)(6486002)(86362001)(26005)(6512007)(6506007)(83380400001)(38100700002);DIR:OUT;SFP:1101; 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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Nov 2022 18:47:16.2433 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e87a7734-daa4-4e57-75cc-08dac4152780 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[63.35.35.123];Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-AuthSource: DBAEUR03FT056.eop-EUR03.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: GVXPR08MB8234 X-Spam-Status: No, score=-13.1 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,FORGED_SPF_HELO,GIT_PATCH_0,KAM_DMARC_NONE,RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_NONE,TXREP,UNPARSEABLE_RELAY 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: The upcoming c[lt]z idiom recognition patch eliminates the need for a brute force computation of the iteration count of these loops. The test is intended to verify that ivcanon can determine the loop count when the condition is given by a chain of constant computations. We replace the constant operations with a more complicated chain that should resist future idiom recognition. gcc/testsuite/ChangeLog: * gcc.dg/pr77975.c: Make tests more robust. -- diff --git a/gcc/testsuite/gcc.dg/pr77975.c b/gcc/testsuite/gcc.dg/pr77975.c index 148cebdded964da7fce148abdf2a430c55650513..a187ce2b50c2821841e71b5b6cb243a37a66fb57 100644 --- a/gcc/testsuite/gcc.dg/pr77975.c +++ b/gcc/testsuite/gcc.dg/pr77975.c @@ -7,10 +7,11 @@ unsigned int foo (unsigned int *b) { - unsigned int a = 3; + unsigned int a = 8; while (a) { - a >>= 1; + a += 5; + a &= 44; *b += a; } return a; @@ -21,10 +22,11 @@ foo (unsigned int *b) unsigned int bar (unsigned int *b) { - unsigned int a = 7; + unsigned int a = 3; while (a) { - a >>= 1; + a += 5; + a &= 44; *b += a; } return a;