From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from xry111.site (xry111.site [89.208.246.23]) by sourceware.org (Postfix) with ESMTPS id 70BDA3858D1E for ; Tue, 18 Apr 2023 12:18:09 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 70BDA3858D1E Authentication-Results: sourceware.org; dmarc=pass (p=reject dis=none) header.from=xry111.site Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=xry111.site DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=xry111.site; s=default; t=1681820287; bh=mhT4rr0RK/DmOWsRON+1E7IV2aSGQfN19hqV5cCzrGs=; h=From:To:Cc:Subject:Date:From; b=hU3PpjBLMjXYAUU7yoNQD6EzxfsHIctl4uUVk2WvoPa15R1fM1V6DnavUZE5wILcS JCzZEECYR6l+oPDO3+mNcK5co6UNfKAnkFpxhLff+syRwQ+CX9U4j+BlFSFv3CX2tH jxRK52VHpnImAaD7m3dSysaM9uqMFjM90Zg9zjK0= Received: from stargazer.. (unknown [115.155.1.124]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-384) server-digest SHA384) (Client did not present a certificate) (Authenticated sender: xry111@xry111.site) by xry111.site (Postfix) with ESMTPSA id 1731365EBC; Tue, 18 Apr 2023 08:18:05 -0400 (EDT) From: Xi Ruoyao To: gcc-patches@gcc.gnu.org Cc: Lulu Cheng , WANG Xuerui , Chenghua Xu , Xi Ruoyao Subject: [PATCH] LoongArch: Set 4 * (issue rate) as the default for -falign-functions and -falign-loops Date: Tue, 18 Apr 2023 20:17:53 +0800 Message-Id: <20230418121753.50830-1-xry111@xry111.site> X-Mailer: git-send-email 2.40.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-7.0 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,GIT_PATCH_0,LIKELY_SPAM_FROM,RCVD_IN_BARRACUDACENTRAL,SPF_HELO_PASS,SPF_PASS,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: According to Xuerui's LLVM changeset [1], doing so can make a significant performace gain. Bootstrapped and regtested on loongarch64-linux-gnu. Ok for GCC 14? [1]:https://reviews.llvm.org/D148622 gcc/ChangeLog: * config/loongarch/loongarch.cc (loongarch_option_override_internal): If -falign-functions is used but the alignment is not explicitly specified, set it to 4 * loongarch_issue_rate (). Likewise for -falign-loops. --- gcc/config/loongarch/loongarch.cc | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/gcc/config/loongarch/loongarch.cc b/gcc/config/loongarch/loongarch.cc index 06fc1cd0604..6552484de7c 100644 --- a/gcc/config/loongarch/loongarch.cc +++ b/gcc/config/loongarch/loongarch.cc @@ -6236,6 +6236,17 @@ loongarch_option_override_internal (struct gcc_options *opts) && !opts->x_optimize_size) opts->x_flag_prefetch_loop_arrays = 1; + /* Align functions and loops to (issue rate) * (insn size) to improve + the throughput of the fetching units. */ + char *align = XNEWVEC (char, 16); + sprintf (align, "%d", loongarch_issue_rate () * 4); + + if (opts->x_flag_align_functions && !opts->x_str_align_functions) + opts->x_str_align_functions = align; + + if (opts->x_flag_align_loops && !opts->x_str_align_loops) + opts->x_str_align_loops = align; + if (TARGET_DIRECT_EXTERN_ACCESS && flag_shlib) error ("%qs cannot be used for compiling a shared library", "-mdirect-extern-access"); -- 2.40.0