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Mon, 7 Aug 2017 14:13:16 +0000 From: Wilco Dijkstra To: GCC Patches , James Greenhalgh CC: nd , Richard Earnshaw Subject: [PATCH][AArch64] Simplify aarch64_can_eliminate Date: Mon, 7 Aug 2017 14:13:16 +0000 Message-ID: authentication-results: spf=none (sender IP is ) smtp.mailfrom=Wilco.Dijkstra@arm.com; x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1; VI1PR0802MB2399; 6:M00NEkK92boOFsVvLr+BKdIFpdrZ/DdVdPw49eGH3lBAKATek7eftMb132XZM9boT+vMD6nwvbpEumU/+v0tUXlkyi/mnJ+GfCNk329IZbTITRksi+qfgAzn0tYIZssS1fC7XVZI4jbl2YZYZv3lwdVCVxN0GqhUusUhdBpxOj34Sr9LGbVDvUnxHU45DqdddR6+9SivIa9mOKm44+4xqJ+jRTQWqckfzJ1jcdKQzkaHHKA/rykMVC/am8r6iUYBsvxGaNeaPz1u5688Gp0X3sqmtNBM640sjNVVhfJD8FImRdwgvOGgAHUrgNDK2v7WQoKY280aEQeNvlBfp7ofBg==; 5:Yk+3ExzBf3PGJhLd/WmerCTRCLOwEbOTg+W6olBcU1BRTE3FMVn6oyiJwJNjWLw5XIwcRMABEj325EF1OBrDLymxhXxu67ML3SHkzRMKHRgCCvnK/yK/9XXQWfrYEEuWey1dJr+JKt1Z5H+AE03Q+g==; 24:vn7AmN+g5zmn6oBg/dRk1QnNzXaUiDQJGhi+MsilLbykOKBhOx7903co7fBZWXeMWwOnvGmzLUhWlkJUDUfJ80zrjRQ4bTv0DmnoIo7fGJc=; 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A:1; MX:1; LANG:en; received-spf: None (protection.outlook.com: arm.com does not designate permitted sender hosts) spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM MIME-Version: 1.0 X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-originalarrivaltime: 07 Aug 2017 14:13:16.7960 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR0802MB2399 Simplify aarch64_can_eliminate - if we need a frame pointer, we must eliminate to HARD_FRAME_POINTER_REGNUM. Rather than hardcoding all combinations from the ELIMINABLE_REGS list, just do the correct check. ChangeLog: 2017-08-07 Wilco Dijkstra gcc/ * config/aarch64/aarch64.c (aarch64_can_eliminate): Simplify logic. diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c index 9463edf63ffe770062b4120fada090e20c93a269..fbb4244cb58d2a25203aa27342c2f7988c30bd98 100644 --- a/gcc/config/aarch64/aarch64.c +++ b/gcc/config/aarch64/aarch64.c @@ -5858,26 +5858,12 @@ aarch64_secondary_reload (bool in_p ATTRIBUTE_UNUSED, rtx x, } static bool -aarch64_can_eliminate (const int from, const int to) +aarch64_can_eliminate (const int from ATTRIBUTE_UNUSED, const int to) { - /* If we need a frame pointer, we must eliminate FRAME_POINTER_REGNUM into - HARD_FRAME_POINTER_REGNUM and not into STACK_POINTER_REGNUM. */ - + /* If we need a frame pointer, ARG_POINTER_REGNUM and FRAME_POINTER_REGNUM + can only eliminate to HARD_FRAME_POINTER_REGNUM. */ if (frame_pointer_needed) - { - if (from == ARG_POINTER_REGNUM && to == HARD_FRAME_POINTER_REGNUM) - return true; - if (from == ARG_POINTER_REGNUM && to == STACK_POINTER_REGNUM) - return false; - if (from == FRAME_POINTER_REGNUM && to == STACK_POINTER_REGNUM - && !cfun->calls_alloca) - return true; - if (from == FRAME_POINTER_REGNUM && to == HARD_FRAME_POINTER_REGNUM) - return true; - - return false; - } - + return to == HARD_FRAME_POINTER_REGNUM; return true; }