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Tue, 4 Oct 2022 17:22:35 +0000 From: Wilco Dijkstra To: GCC Patches CC: Richard Sandiford Subject: [PATCH][AArch64] Improve immediate expansion [PR106583] Thread-Topic: [PATCH][AArch64] Improve immediate expansion [PR106583] Thread-Index: AQHY2A60YLzBQMfh40K/8+uaM+WmLw== Date: Tue, 4 Oct 2022 17:22:35 +0000 Message-ID: Accept-Language: en-GB, en-US Content-Language: en-GB X-MS-Has-Attach: X-MS-TNEF-Correlator: msip_labels: Authentication-Results-Original: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=arm.com; x-ms-traffictypediagnostic: AS4PR08MB7901:EE_|AS4PR08MB7553:EE_|DBAEUR03FT035:EE_|AS2PR08MB8364:EE_ X-MS-Office365-Filtering-Correlation-Id: 787b060a-3e5b-4979-959d-08daa62d0fb6 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:AS4PR08MB7901.eurprd08.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230022)(4636009)(376002)(39860400002)(396003)(346002)(366004)(136003)(451199015)(71200400001)(9686003)(478600001)(6916009)(316002)(84970400001)(122000001)(38100700002)(66476007)(41300700001)(186003)(8676002)(66446008)(66946007)(64756008)(4326008)(76116006)(66556008)(91956017)(8936002)(6506007)(7696005)(38070700005)(5660300002)(86362001)(33656002)(55016003)(52536014)(26005)(2906002)(14773001);DIR:OUT;SFP:1101; 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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 04 Oct 2022 17:22:49.3553 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 787b060a-3e5b-4979-959d-08daa62d0fb6 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: DBAEUR03FT035.eop-EUR03.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS2PR08MB8364 X-Spam-Status: No, score=-11.2 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,FORGED_SPF_HELO,GIT_PATCH_0,KAM_DMARC_NONE,KAM_SHORT,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: Improve immediate expansion of immediates which can be created from a=0A= bitmask immediate and 2 MOVKs. This reduces the number of 4-instruction=0A= immediates in SPECINT/FP by 10-15%.=0A= =0A= Passes regress, OK for commit?=0A= =0A= gcc/ChangeLog:=0A= =0A= PR target/106583=0A= * config/aarch64/aarch64.cc (aarch64_internal_mov_immediate)=0A= Add support for a bitmask immediate with 2 MOVKs.=0A= =0A= gcc/testsuite:=0A= PR target/106583=0A= * gcc.target/aarch64/pr106583.c: Add new test.=0A= =0A= ---=0A= =0A= diff --git a/gcc/config/aarch64/aarch64.cc b/gcc/config/aarch64/aarch64.cc= =0A= index 926e81f028c82aac9a5fecc18f921f84399c24ae..1601d11710cb6132c80a77bb4fe= 2f8429519aa5a 100644=0A= --- a/gcc/config/aarch64/aarch64.cc=0A= +++ b/gcc/config/aarch64/aarch64.cc=0A= @@ -5568,7 +5568,7 @@ aarch64_internal_mov_immediate (rtx dest, rtx imm, bo= ol generate,=0A= one_match =3D ((~val & mask) =3D=3D 0) + ((~val & (mask << 16)) =3D=3D 0= ) +=0A= ((~val & (mask << 32)) =3D=3D 0) + ((~val & (mask << 48)) =3D=3D 0);= =0A= =0A= - if (zero_match !=3D 2 && one_match !=3D 2)=0A= + if (zero_match < 2 && one_match < 2)=0A= {=0A= /* Try emitting a bitmask immediate with a movk replacing 16 bits.= =0A= For a 64-bit bitmask try whether changing 16 bits to all ones or=0A= @@ -5600,6 +5600,43 @@ aarch64_internal_mov_immediate (rtx dest, rtx imm, b= ool generate,=0A= }=0A= }=0A= =0A= + /* Try a bitmask plus 2 movk to generate the immediate in 3 instructions= . */=0A= + if (zero_match + one_match =3D=3D 0)=0A= + {=0A= + mask =3D 0xffffffff;=0A= +=0A= + for (i =3D 0; i < 64; i +=3D 16)=0A= + {=0A= + val2 =3D val & ~mask;=0A= + if (aarch64_bitmask_imm (val2, mode))=0A= + break;=0A= + val2 =3D val | mask;=0A= + if (aarch64_bitmask_imm (val2, mode))=0A= + break;=0A= + val2 =3D val2 & ~mask;=0A= + val2 =3D val2 | (((val2 >> 32) | (val2 << 32)) & mask);=0A= + if (aarch64_bitmask_imm (val2, mode))=0A= + break;=0A= +=0A= + mask =3D (mask << 16) | (mask >> 48);=0A= + }=0A= +=0A= + if (i !=3D 64)=0A= + {=0A= + if (generate)=0A= + {=0A= + emit_insn (gen_rtx_SET (dest, GEN_INT (val2)));=0A= + emit_insn (gen_insv_immdi (dest, GEN_INT (i),=0A= + GEN_INT ((val >> i) & 0xffff)));=0A= + i =3D (i + 16) & 63;=0A= + emit_insn (gen_insv_immdi (dest, GEN_INT (i),=0A= + GEN_INT ((val >> i) & 0xffff)));=0A= + }=0A= +=0A= + return 3;=0A= + }=0A= + }=0A= +=0A= /* Generate 2-4 instructions, skipping 16 bits of all zeroes or ones whi= ch=0A= are emitted by the initial mov. If one_match > zero_match, skip set = bits,=0A= otherwise skip zero bits. */=0A= diff --git a/gcc/testsuite/gcc.target/aarch64/pr106583.c b/gcc/testsuite/gc= c.target/aarch64/pr106583.c=0A= new file mode 100644=0A= index 0000000000000000000000000000000000000000..f0a027a0950e506d4ddaacce5e1= 51f57070948dc=0A= --- /dev/null=0A= +++ b/gcc/testsuite/gcc.target/aarch64/pr106583.c=0A= @@ -0,0 +1,30 @@=0A= +/* { dg-do assemble } */=0A= +/* { dg-options "-O2 --save-temps" } */=0A= +=0A= +long f1 (void)=0A= +{=0A= + return 0x7efefefefefefeff;=0A= +}=0A= +=0A= +long f2 (void)=0A= +{=0A= + return 0x12345678aaaaaaaa;=0A= +}=0A= +=0A= +long f3 (void)=0A= +{=0A= + return 0x1234cccccccc5678;=0A= +}=0A= +=0A= +long f4 (void)=0A= +{=0A= + return 0x7777123456787777;=0A= +}=0A= +=0A= +long f5 (void)=0A= +{=0A= + return 0x5555555512345678;=0A= +}=0A= +=0A= +/* { dg-final { scan-assembler-times {\tmovk\t} 10 } } */=0A= +/* { dg-final { scan-assembler-times {\tmov\t} 5 } } */=0A= =0A=