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GET /api/patches/2225651/?format=api
{ "id": 2225651, "url": "http://patchwork.ozlabs.org/api/patches/2225651/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/patch/20260421111416.6E5524BA23F9@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": "<20260421111416.6E5524BA23F9@sourceware.org>", "list_archive_url": null, "date": "2026-04-21T11:13:48", "name": "tree-optimization/124947 - IVOPTs emits uninit use", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "476956f8dc93528700ec085e2fecc9a57588d882", "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/20260421111416.6E5524BA23F9@sourceware.org/mbox/", "series": [ { "id": 500781, "url": "http://patchwork.ozlabs.org/api/series/500781/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/list/?series=500781", "date": "2026-04-21T11:13:48", "name": "tree-optimization/124947 - IVOPTs emits uninit use", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/500781/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2225651/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2225651/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=X8fiOV/u;\n\tdkim=pass header.d=suse.de header.i=@suse.de header.a=ed25519-sha256\n header.s=susede2_ed25519 header.b=3dEHhPp5;\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=X8fiOV/u;\n\tdkim=neutral header.d=suse.de header.i=@suse.de header.a=ed25519-sha256\n header.s=susede2_ed25519 header.b=3dEHhPp5;\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=1776770028;\n h=from:from:reply-to:date:date:to:to:cc:mime-version:mime-version:\n content-type:content-type; bh=2rRmtnTOrBXFPb4jIgctgwgx80KH4sodY2wKqGvuIHw=;\n b=3dEHhPp57jeuA753EpHt05RjXRVlJ32WmNXZam7QZ+rF0IVqNbYgnyUO/eA6P3DIJstDcp\n I+8K9QYhUTicm4BA==", "v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de;\n s=susede2_rsa;\n t=1776770028;\n h=from:from:reply-to:date:date:to:to:cc:mime-version:mime-version:\n content-type:content-type; bh=2rRmtnTOrBXFPb4jIgctgwgx80KH4sodY2wKqGvuIHw=;\n b=X8fiOV/uOxGJhgsI9jF0sfP3buTtGygVH5S63Whf2fqoyarbap/jgkQeqrdhevBNlIGQbq\n E1oruQtALlgpXJDbjJ2R5ipsSNgMh74zg/4vF/X7MXueI7/rE3uBYI+8cGmpN7HDfnQC8x\n H+qxWEEDAtHZ9e6WQ+Us75PXcAYHyWk=", "v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de;\n s=susede2_ed25519; t=1776770028;\n h=from:from:reply-to:date:date:to:to:cc:mime-version:mime-version:\n content-type:content-type; bh=2rRmtnTOrBXFPb4jIgctgwgx80KH4sodY2wKqGvuIHw=;\n b=3dEHhPp57jeuA753EpHt05RjXRVlJ32WmNXZam7QZ+rF0IVqNbYgnyUO/eA6P3DIJstDcp\n I+8K9QYhUTicm4BA==" ], "Date": "Tue, 21 Apr 2026 13:13:48 +0200 (CEST)", "From": "Richard Biener <rguenther@suse.de>", "To": "gcc-patches@gcc.gnu.org", "Subject": "[PATCH] tree-optimization/124947 - IVOPTs emits uninit use", "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 TO_MATCH_ENVRCPT_ALL(0.00)[]; RCPT_COUNT_ONE(0.00)[1];\n MISSING_XM_UA(0.00)[]; FROM_EQ_ENVFROM(0.00)[];\n TO_DN_NONE(0.00)[]; ARC_NA(0.00)[]; RCVD_COUNT_ZERO(0.00)[0];\n FUZZY_RATELIMITED(0.00)[rspamd.com];\n DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519];\n MIME_TRACE(0.00)[0:+]; FROM_HAS_DN(0.00)[]", "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": "<20260421111416.6E5524BA23F9@sourceware.org>" }, "content": "The following prevents IVOPTs from rewriting a compare using an IV\nthat involves undefined SSA vars.\n\nBootstrapped and tested on x86_64-unknown-linux-gnu, queued for stage1.\n\n\tPR tree-optimization/124947\n\t* tree-ssa-loop-ivopts.cc (may_eliminate_iv): Do not use\n\ta candidate that involves undefs.\n\n\t* gcc.dg/pr124947.c: New testcase.\n---\n gcc/testsuite/gcc.dg/pr124947.c | 19 +++++++++++++++++++\n gcc/tree-ssa-loop-ivopts.cc | 5 +++++\n 2 files changed, 24 insertions(+)\n create mode 100644 gcc/testsuite/gcc.dg/pr124947.c", "diff": "diff --git a/gcc/testsuite/gcc.dg/pr124947.c b/gcc/testsuite/gcc.dg/pr124947.c\nnew file mode 100644\nindex 00000000000..5e64d29a943\n--- /dev/null\n+++ b/gcc/testsuite/gcc.dg/pr124947.c\n@@ -0,0 +1,19 @@\n+/* { dg-options \"-O -fdump-tree-ivopts\" } */\n+\n+long *BN_uadd_ap;\n+\n+void\n+BN_uadd (int dif, long t1)\n+{\n+ volatile long *rp;\n+ while (dif)\n+ {\n+ dif--;\n+ t1 = *BN_uadd_ap;\n+ *rp++ = t1;\n+ if (t1)\n+ break;\n+ }\n+}\n+\n+/* { dg-final { scan-tree-dump-times \"rp_\\[0-9\\]+\\\\\\(D\\\\\\)\" 1 \"ivopts\" } } */\ndiff --git a/gcc/tree-ssa-loop-ivopts.cc b/gcc/tree-ssa-loop-ivopts.cc\nindex 6ecf5bef7b4..dfec607fd2e 100644\n--- a/gcc/tree-ssa-loop-ivopts.cc\n+++ b/gcc/tree-ssa-loop-ivopts.cc\n@@ -5382,6 +5382,11 @@ may_eliminate_iv (struct ivopts_data *data,\n aff_tree bnd;\n class tree_niter_desc *desc = NULL;\n \n+ /* If the IV candidate involves undefs do not attempt to use it to\n+ express a condition. */\n+ if (cand->involves_undefs)\n+ return false;\n+\n if (TREE_CODE (cand->iv->step) != INTEGER_CST)\n return false;\n \n", "prefixes": [] }