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Thu, 10 Oct 2019 17:25:14 +0000 From: Wilco Dijkstra To: GCC Patches , Kyrylo Tkachov , Richard Earnshaw , Richard Sandiford CC: nd Subject: Re: [PATCH][ARM] Tweak HONOR_REG_ALLOC_ORDER Date: Thu, 10 Oct 2019 17:26:00 -0000 Message-ID: References: In-Reply-To: Authentication-Results-Original: spf=none (sender IP is ) smtp.mailfrom=Wilco.Dijkstra@arm.com; x-ms-exchange-transport-forked: True x-checkrecipientrouted: true x-ms-oob-tlc-oobclassifiers: OLM:8882;OLM:8882; X-Forefront-Antispam-Report-Untrusted: SFV:NSPM;SFS:(10009020)(4636009)(39860400002)(346002)(376002)(366004)(136003)(396003)(54534003)(199004)(189003)(9686003)(316002)(6116002)(6246003)(14454004)(6636002)(486006)(476003)(3846002)(71200400001)(110136005)(478600001)(25786009)(4326008)(5660300002)(71190400001)(52536014)(81166006)(76116006)(55016002)(66446008)(256004)(14444005)(33656002)(6506007)(7696005)(66946007)(102836004)(26005)(186003)(66556008)(8936002)(8676002)(81156014)(64756008)(2906002)(76176011)(66476007)(74316002)(11346002)(229853002)(66066001)(446003)(6436002)(305945005)(86362001)(7736002)(99286004);DIR:OUT;SFP:1101;SCL:1;SRVR:VI1PR0801MB1677;H:VI1PR0801MB2127.eurprd08.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;A:1;MX:1; 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So only set it when optimizing= for size. On Cortex-A57 this improves SPECINT2006 by 0.15% and SPECFP2006 by 0= .25% while reducing codesize. Bootstrap OK, OK for commit? ChangeLog: 2019-09-09 Wilco Dijkstra * config/arm/arm.h (HONOR_REG_ALLOC_ORDER): Set when optimizing for= size. -- diff --git a/gcc/config/arm/arm.h b/gcc/config/arm/arm.h index 8d023389eec469ad9c8a4e88edebdad5f3c23769..e3473e29fbbb964ff1136c226fb= e30d35dbf7b39 100644 --- a/gcc/config/arm/arm.h +++ b/gcc/config/arm/arm.h @@ -1065,9 +1065,8 @@ extern int arm_regs_in_sequence[]; /* Use different register alloc ordering for Thumb. */ #define ADJUST_REG_ALLOC_ORDER arm_order_regs_for_local_alloc () =20 -/* Tell IRA to use the order we define rather than messing it up with its - own cost calculations. */ -#define HONOR_REG_ALLOC_ORDER 1 +/* Tell IRA to use the order we define when optimizing for size. */ +#define HONOR_REG_ALLOC_ORDER optimize_size =20 /* Interrupt functions can only use registers that have already been saved by the prologue, even if they would normally be