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GET /api/patches/2217683/?format=api
{ "id": 2217683, "url": "http://patchwork.ozlabs.org/api/patches/2217683/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/patch/20260330113601.AFC844BA2E1E@sourceware.org/", "project": { "id": 17, "url": "http://patchwork.ozlabs.org/api/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, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260330113601.AFC844BA2E1E@sourceware.org>", "list_archive_url": null, "date": "2026-03-30T11:35:22", "name": "tree-optimization/124677 - wrong recurrence permute placement", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "f551c73b13b5d3434fc773c5127d7decab565dc9", "submitter": { "id": 4338, "url": "http://patchwork.ozlabs.org/api/people/4338/?format=api", "name": "Richard Biener", "email": "rguenther@suse.de" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/gcc/patch/20260330113601.AFC844BA2E1E@sourceware.org/mbox/", "series": [ { "id": 498001, "url": "http://patchwork.ozlabs.org/api/series/498001/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/list/?series=498001", "date": "2026-03-30T11:35:22", "name": "tree-optimization/124677 - wrong recurrence permute placement", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/498001/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2217683/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2217683/checks/", "tags": {}, "related": [], "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=hYqwoVLs;\n\tdkim=pass header.d=suse.de header.i=@suse.de header.a=ed25519-sha256\n header.s=susede2_ed25519 header.b=bgkkK5u7;\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=KsI3RzzH;\n\tdkim=neutral header.d=suse.de header.i=@suse.de header.a=ed25519-sha256\n header.s=susede2_ed25519 header.b=qLsQ6IE4;\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=1774870524;\n h=from:from:reply-to:date:date:to:to:cc:mime-version:mime-version:\n content-type:content-type; bh=CfqhU4Hjel0T+w2SZbMSsXRzrB/yIWiY5+gInIsqvWM=;\n b=bgkkK5u7BuEtmo7giEylNutglE3XgoQBmsD/fMqQXVtk4u752qRZGIuK9flnaBiRNKyoob\n aYZ4fkbIO5gz47CA==", "v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de;\n s=susede2_rsa;\n t=1774870522;\n h=from:from:reply-to:date:date:to:to:cc:mime-version:mime-version:\n content-type:content-type; bh=CfqhU4Hjel0T+w2SZbMSsXRzrB/yIWiY5+gInIsqvWM=;\n b=KsI3RzzHRhjjLMmmDp2TsisZBbQnjR/qoebcwoTB5H9hn2Jq3eW2BR7OlyeSy1bDmGX3EO\n HX3Cppx9y9M1ZFOg+Slo43VQ0zYlZcK+AXGnh9n/cVQePr0mM3hcHatPopIIGUjKIYEJeh\n RlHG7PhqyAkCPewS2LmGBIa77lEDFco=", "v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de;\n s=susede2_ed25519; t=1774870522;\n h=from:from:reply-to:date:date:to:to:cc:mime-version:mime-version:\n content-type:content-type; bh=CfqhU4Hjel0T+w2SZbMSsXRzrB/yIWiY5+gInIsqvWM=;\n b=qLsQ6IE47q4GWRBiw5KL5CBqgX58aD8sWHQWMyEVPnXe52SQKAKhyJqZK0ItkZNsIPcQKc\n q4wCqSQsB1mIctAQ==" ], "Date": "Mon, 30 Mar 2026 13:35:22 +0200 (CEST)", "From": "Richard Biener <rguenther@suse.de>", "To": "gcc-patches@gcc.gnu.org", "Subject": "[PATCH] tree-optimization/124677 - wrong recurrence permute placement", "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)[-0.998];\n NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain];\n RCPT_COUNT_ONE(0.00)[1]; FROM_HAS_DN(0.00)[];\n MIME_TRACE(0.00)[0:+]; MISSING_XM_UA(0.00)[]; ARC_NA(0.00)[];\n RCVD_COUNT_ZERO(0.00)[0];\n DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519];\n FROM_EQ_ENVFROM(0.00)[]; FUZZY_RATELIMITED(0.00)[rspamd.com];\n TO_DN_NONE(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[];\n DBL_BLOCKED_OPENRESOLVER(0.00)[murzim.nue2.suse.org:helo,\n tree-vect-loop.cc:url]", "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": "<20260330113601.AFC844BA2E1E@sourceware.org>" }, "content": "When vectorizing a recurrence we have to skip inserted vector\nstmts for the latch definition when finding the insertion point\nfor the permute.\n\nBootstrapped and tested on x86_64-unknown-linux-gnu, pushed.\n\n\tPR tree-optimization/124677\n\t* tree-vect-loop.cc (vectorizable_recurr): Skip vector\n\tstmts for the def.\n\n\t* gcc.dg/vect/vect-pr124677.c: New testcase.\n---\n gcc/testsuite/gcc.dg/vect/vect-pr124677.c | 25 +++++++++++++++++++++++\n gcc/tree-vect-loop.cc | 8 +++++++-\n 2 files changed, 32 insertions(+), 1 deletion(-)\n create mode 100644 gcc/testsuite/gcc.dg/vect/vect-pr124677.c", "diff": "diff --git a/gcc/testsuite/gcc.dg/vect/vect-pr124677.c b/gcc/testsuite/gcc.dg/vect/vect-pr124677.c\nnew file mode 100644\nindex 00000000000..ee00a5612a3\n--- /dev/null\n+++ b/gcc/testsuite/gcc.dg/vect/vect-pr124677.c\n@@ -0,0 +1,25 @@\n+/* { dg-do compile } */\n+/* { dg-additional-options \"-O3 -fno-tree-copy-prop\" } */\n+\n+int printf(const char *, ...);\n+int a, b, c, d, e;\n+int g(int h) { return h >> a; }\n+int main()\n+{\n+ int j = c;\n+ while (a)\n+ while (1)\n+ {\n+\twhile (1)\n+\t {\n+\t for (e = 0; e < 16; e++)\n+\t {\n+\t\td = b;\n+\t\tj && (b = g(2));\n+\t }\n+\t break;\n+\t }\n+\tprintf(\"%d\\n\", b);\n+ }\n+ return 0;\n+}\ndiff --git a/gcc/tree-vect-loop.cc b/gcc/tree-vect-loop.cc\nindex 7121edb8d81..5d4af8c8ee5 100644\n--- a/gcc/tree-vect-loop.cc\n+++ b/gcc/tree-vect-loop.cc\n@@ -8863,7 +8863,13 @@ vectorizable_recurr (loop_vec_info loop_vinfo, stmt_vec_info stmt_info,\n edge le = loop_latch_edge (LOOP_VINFO_LOOP (loop_vinfo));\n gimple *latch_def = SSA_NAME_DEF_STMT (PHI_ARG_DEF_FROM_EDGE (phi, le));\n gimple_stmt_iterator gsi2 = gsi_for_stmt (latch_def);\n- gsi_next (&gsi2);\n+ do\n+ {\n+ gsi_next (&gsi2);\n+ }\n+ /* Skip inserted vectorized stmts for the latch definition. We have to\n+ insert after those. */\n+ while (gimple_uid (gsi_stmt (gsi2)) == 0);\n \n for (unsigned i = 0; i < ncopies; ++i)\n {\n", "prefixes": [] }