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GET /api/1.1/patches/2230107/?format=api
{ "id": 2230107, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2230107/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/patch/20260429090406.A96D74BB24E6@sourceware.org/", "project": { "id": 17, "url": "http://patchwork.ozlabs.org/api/1.1/projects/17/?format=api", "name": "GNU Compiler Collection", "link_name": "gcc", "list_id": "gcc-patches.gcc.gnu.org", "list_email": "gcc-patches@gcc.gnu.org", "web_url": null, "scm_url": null, "webscm_url": null }, "msgid": "<20260429090406.A96D74BB24E6@sourceware.org>", "date": "2026-04-29T09:03:36", "name": "tree-optimization/120702 - avoid folding loads to STRING_CSTs", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "c65be390b903b93f51dbe43824da89a6311f2f38", "submitter": { "id": 4338, "url": "http://patchwork.ozlabs.org/api/1.1/people/4338/?format=api", "name": "Richard Biener", "email": "rguenther@suse.de" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/gcc/patch/20260429090406.A96D74BB24E6@sourceware.org/mbox/", "series": [ { "id": 502019, "url": "http://patchwork.ozlabs.org/api/1.1/series/502019/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/list/?series=502019", "date": "2026-04-29T09:03:36", "name": "tree-optimization/120702 - avoid folding loads to STRING_CSTs", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/502019/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2230107/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2230107/checks/", "tags": {}, "headers": { "Return-Path": "<gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "gcc-patches@gcc.gnu.org" ], "Delivered-To": [ "patchwork-incoming@legolas.ozlabs.org", "gcc-patches@gcc.gnu.org" ], "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=suse.de header.i=@suse.de header.a=rsa-sha256\n header.s=susede2_rsa header.b=OLdZhXqF;\n\tdkim=pass header.d=suse.de header.i=@suse.de header.a=ed25519-sha256\n header.s=susede2_ed25519 header.b=B92vIHLm;\n\tdkim=pass (1024-bit key) header.d=suse.de header.i=@suse.de\n header.a=rsa-sha256 header.s=susede2_rsa header.b=dWVPkvbG;\n\tdkim=neutral header.d=suse.de header.i=@suse.de header.a=ed25519-sha256\n header.s=susede2_ed25519 header.b=VO9C8sUv;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=gcc.gnu.org\n (client-ip=2620:52:6:3111::32; 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a=ed25519-sha256; c=relaxed/relaxed; d=suse.de;\n s=susede2_ed25519; t=1777453417;\n h=from:from:reply-to:date:date:to:to:cc:cc:mime-version:mime-version:\n content-type:content-type; bh=C7mSJnyQFVIkbkPI4UJEDwKR24JSKE0G7Pk78mJn1rA=;\n b=B92vIHLmpsdYKqcDVzvnBaryYuLvzaq202/dSJyCK/2R3D1lCzKeU9NZWd3DmMftaQYIJ4\n cSaAllOcrZtUszAw==", "v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de;\n s=susede2_rsa;\n t=1777453416;\n h=from:from:reply-to:date:date:to:to:cc:cc:mime-version:mime-version:\n content-type:content-type; bh=C7mSJnyQFVIkbkPI4UJEDwKR24JSKE0G7Pk78mJn1rA=;\n b=dWVPkvbGVjRIOsH+xUfF+Jk2hp35qYq5shnPLTGNTpS5ZbcNoCyH2gtZurfKyXTpxg0tVW\n DgAH8xsnACT4O+ms9cW3id2VtfbkOkUcifHTSXamos2W9uCZfkCquvz3h1DS61QelXb1rc\n vFodd750N5mn4Op8VzOdcnz/rPi6Rfo=", "v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de;\n s=susede2_ed25519; t=1777453416;\n h=from:from:reply-to:date:date:to:to:cc:cc:mime-version:mime-version:\n content-type:content-type; bh=C7mSJnyQFVIkbkPI4UJEDwKR24JSKE0G7Pk78mJn1rA=;\n b=VO9C8sUvaVZnSeMSvMS+tlMLq+aMUbKa7xEyAm1moc/i/fvbcQPzV9APh+Xu/tyC3QXhAY\n rQoL1qw1fOZf3MDQ==" ], "Date": "Wed, 29 Apr 2026 11:03:36 +0200 (CEST)", "From": "Richard Biener <rguenther@suse.de>", "To": "gcc-patches@gcc.gnu.org", "cc": "andrew.pinski@oss.qualcomm.com, Jakub Jelinek <jakub@redhat.com>", "Subject": "[PATCH] tree-optimization/120702 - avoid folding loads to STRING_CSTs", "MIME-Version": "1.0", "Content-Type": "text/plain; charset=US-ASCII", "X-Spamd-Result": "default: False [-1.80 / 50.00]; BAYES_HAM(-3.00)[100.00%];\n MISSING_MID(2.50)[]; NEURAL_HAM_LONG(-1.00)[-1.000];\n NEURAL_HAM_SHORT(-0.20)[-0.999]; MIME_GOOD(-0.10)[text/plain];\n FROM_HAS_DN(0.00)[]; MIME_TRACE(0.00)[0:+];\n MISSING_XM_UA(0.00)[]; ARC_NA(0.00)[];\n RCVD_COUNT_ZERO(0.00)[0]; TO_DN_SOME(0.00)[];\n FROM_EQ_ENVFROM(0.00)[]; FUZZY_RATELIMITED(0.00)[rspamd.com];\n TO_MATCH_ENVRCPT_ALL(0.00)[];\n DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519];\n RCPT_COUNT_THREE(0.00)[3]", "X-BeenThere": "gcc-patches@gcc.gnu.org", "X-Mailman-Version": "2.1.30", "Precedence": "list", "List-Id": "Gcc-patches mailing list <gcc-patches.gcc.gnu.org>", "List-Unsubscribe": "<https://gcc.gnu.org/mailman/options/gcc-patches>,\n <mailto:gcc-patches-request@gcc.gnu.org?subject=unsubscribe>", "List-Archive": "<https://gcc.gnu.org/pipermail/gcc-patches/>", "List-Post": "<mailto:gcc-patches@gcc.gnu.org>", "List-Help": "<mailto:gcc-patches-request@gcc.gnu.org?subject=help>", "List-Subscribe": "<https://gcc.gnu.org/mailman/listinfo/gcc-patches>,\n <mailto:gcc-patches-request@gcc.gnu.org?subject=subscribe>", "Errors-To": "gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org", "Message-Id": "<20260429090406.A96D74BB24E6@sourceware.org>" }, "content": "The following avoids (large) string duplication which can happen\nwhen folding aggregate reads to STRING_CSTs. There's unlikely\nto be followup optimization opportunities.\n\nBootstrapped and tested on x86-64-unknown-linuyx-gnu (I was surprised\nthere's no diagnostic testcase fallout).\n\nOK for trunk?\n\nThanks,\nRichard.\n\n\tPR tree-optimization/120702\n\t* gimple-fold.cc (maybe_fold_reference): Only fold\n\tregister type reads.\n\n\t* gcc.dg/tree-ssa/pr120702.c: New testcase.\n---\n gcc/gimple-fold.cc | 5 +++++\n gcc/testsuite/gcc.dg/tree-ssa/pr120702.c | 25 ++++++++++++++++++++++++\n 2 files changed, 30 insertions(+)\n create mode 100644 gcc/testsuite/gcc.dg/tree-ssa/pr120702.c", "diff": "diff --git a/gcc/gimple-fold.cc b/gcc/gimple-fold.cc\nindex 501c1245116..b53478dbb3d 100644\n--- a/gcc/gimple-fold.cc\n+++ b/gcc/gimple-fold.cc\n@@ -306,6 +306,11 @@ maybe_fold_reference (tree expr)\n {\n tree result = NULL_TREE;\n \n+ /* Avoid expensive fold_const_aggregate_ref early on aggregate loads\n+ and esp. replacing STRING_CSTs inline. */\n+ if (!is_gimple_reg_type (TREE_TYPE (expr)))\n+ return NULL_TREE;\n+\n if ((TREE_CODE (expr) == VIEW_CONVERT_EXPR\n || TREE_CODE (expr) == REALPART_EXPR\n || TREE_CODE (expr) == IMAGPART_EXPR)\ndiff --git a/gcc/testsuite/gcc.dg/tree-ssa/pr120702.c b/gcc/testsuite/gcc.dg/tree-ssa/pr120702.c\nnew file mode 100644\nindex 00000000000..fb0f8f73a73\n--- /dev/null\n+++ b/gcc/testsuite/gcc.dg/tree-ssa/pr120702.c\n@@ -0,0 +1,25 @@\n+/* { dg-do compile } */\n+/* { dg-options \"-Os -fdump-tree-optimized\" } */\n+\n+extern void *memcpy(void *, const void *, __SIZE_TYPE__);\n+extern int memcmp(const void *, const void *, __SIZE_TYPE__);\n+\n+static const unsigned char orig[10]\n+ = { 'J', '2', 'O', 'Z', 'F', '5', '0', 'F', 'Y', 'L' };\n+\n+static unsigned char test[10];\n+\n+int\n+verify (void)\n+{\n+ return 0 == memcmp (test, orig, 10 * sizeof (orig[0]));\n+}\n+\n+int\n+benchmark (void)\n+{\n+ memcpy (test, orig, 10 * sizeof (orig[0]));\n+ return 0;\n+}\n+\n+/* { dg-final { scan-tree-dump-not \" = \\\"J2OZF50FYL\\\";\" \"optimized\" } } */\n", "prefixes": [] }