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[2620:52:3:1:0:246e:9693:128c]) by mx.google.com with ESMTPS id mq21-20020a170907831500b008818fe220c1si14669464ejc.80.2023.02.07.05.39.15 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 07 Feb 2023 05:39:16 -0800 (PST) Received-SPF: pass (google.com: domain of gcc-patches-bounces+ouuuleilei=gmail.com@gcc.gnu.org designates 2620:52:3:1:0:246e:9693:128c as permitted sender) client-ip=2620:52:3:1:0:246e:9693:128c; Authentication-Results: mx.google.com; dkim=pass header.i=@gcc.gnu.org header.s=default header.b="E17h/gy9"; spf=pass (google.com: domain of gcc-patches-bounces+ouuuleilei=gmail.com@gcc.gnu.org designates 2620:52:3:1:0:246e:9693:128c as permitted sender) smtp.mailfrom="gcc-patches-bounces+ouuuleilei=gmail.com@gcc.gnu.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=gnu.org Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id EC8273858D35 for ; Tue, 7 Feb 2023 13:39:14 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org EC8273858D35 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1675777155; bh=vKtBYytqNTqDDHED7mA1Qdl2BQWLbcCwCOoVxjvozac=; h=Date:To:Subject:List-Id:List-Unsubscribe:List-Archive:List-Post: List-Help:List-Subscribe:From:Reply-To:From; b=E17h/gy9ixdpnZOvrO3tPgXT504CwUnH3dCszYLoivXmtKThPzV0395mSVAr5opMB OqMHPPXVxKXy8KekbqMtVKk8XpGEXZNFdWBOiw+pe7Cn/4gct3Cvw0Fhhw2aGNU3WG FpDe2YlQwf5/14tUrTjlpxjmZWHZGx5z50b7VUYw= X-Original-To: gcc-patches@gcc.gnu.org Delivered-To: gcc-patches@gcc.gnu.org Received: from smtp-out2.suse.de (smtp-out2.suse.de [195.135.220.29]) by sourceware.org (Postfix) with ESMTPS id EC3EB3858D33 for ; Tue, 7 Feb 2023 13:38:29 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org EC3EB3858D33 Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id C9207202B8 for ; Tue, 7 Feb 2023 13:38:28 +0000 (UTC) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id B735D139ED for ; Tue, 7 Feb 2023 13:38:28 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id fGOwK1RU4mPmdgAAMHmgww (envelope-from ) for ; Tue, 07 Feb 2023 13:38:28 +0000 Date: Tue, 7 Feb 2023 14:38:28 +0100 (CET) To: gcc-patches@gcc.gnu.org Subject: [PATCH] tree-optimization/26854 - compile-time hog in SSA forwprop MIME-Version: 1.0 Message-Id: <20230207133828.B735D139ED@imap2.suse-dmz.suse.de> X-Spam-Status: No, score=-11.8 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: gcc-patches@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Richard Biener via Gcc-patches From: Richard Biener Reply-To: Richard Biener Errors-To: gcc-patches-bounces+ouuuleilei=gmail.com@gcc.gnu.org Sender: "Gcc-patches" X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1757179707760815785?= X-GMAIL-MSGID: =?utf-8?q?1757179707760815785?= The following addresses tree forward propagate : 12.41 ( 9%) seen with the compile.i testcase of this PR which points at the has_use_on_stmt function which, for SSA names with many uses is slow. The solution is to instead of immediate uses, look at stmt operands to identify whether a name has a use on a stmt. That improves SSA forwprop to tree forward propagate : 1.30 ( 0%) for this testcase. Bootstrapped and tested on x86_64-unknown-linux-gnu, pushed. PR tree-optimization/26854 * gimple-fold.cc (has_use_on_stmt): Look at stmt operands instead of immediate uses. --- gcc/gimple-fold.cc | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/gcc/gimple-fold.cc b/gcc/gimple-fold.cc index 379d2e930ea..935e8006413 100644 --- a/gcc/gimple-fold.cc +++ b/gcc/gimple-fold.cc @@ -5767,15 +5767,17 @@ gimple_fold_call (gimple_stmt_iterator *gsi, bool inplace) } -/* Return true whether NAME has a use on STMT. */ +/* Return true whether NAME has a use on STMT. Note this can return + false even though there's a use on STMT if SSA operands are not + up-to-date. */ static bool has_use_on_stmt (tree name, gimple *stmt) { - imm_use_iterator iter; - use_operand_p use_p; - FOR_EACH_IMM_USE_FAST (use_p, iter, name) - if (USE_STMT (use_p) == stmt) + ssa_op_iter iter; + tree op; + FOR_EACH_SSA_TREE_OPERAND (op, stmt, iter, SSA_OP_USE) + if (op == name) return true; return false; }