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GET /api/patches/2197115/?format=api
{ "id": 2197115, "url": "http://patchwork.ozlabs.org/api/patches/2197115/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/patch/CAMe9rOoBUe848b9QMbUZpktxK5XAsFSUa+kDjkKwyOu2u3xBOA@mail.gmail.com/", "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": "<CAMe9rOoBUe848b9QMbUZpktxK5XAsFSUa+kDjkKwyOu2u3xBOA@mail.gmail.com>", "list_archive_url": null, "date": "2026-02-17T05:56:11", "name": "x86: Don't mark clobbered FLAGS_REG as live", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "d979450cc44889b943cefd183336e799532e1b9e", "submitter": { "id": 4387, "url": "http://patchwork.ozlabs.org/api/people/4387/?format=api", "name": "H.J. Lu", "email": "hjl.tools@gmail.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/gcc/patch/CAMe9rOoBUe848b9QMbUZpktxK5XAsFSUa+kDjkKwyOu2u3xBOA@mail.gmail.com/mbox/", "series": [ { "id": 492375, "url": "http://patchwork.ozlabs.org/api/series/492375/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/list/?series=492375", "date": "2026-02-17T05:56:11", "name": "x86: Don't mark clobbered FLAGS_REG as live", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/492375/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2197115/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2197115/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 (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20230601 header.b=a2kyQEKL;\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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Mon, 16 Feb 2026\n 21:56:48 -0800 (PST)", "MIME-Version": "1.0", "From": "\"H.J. Lu\" <hjl.tools@gmail.com>", "Date": "Tue, 17 Feb 2026 13:56:11 +0800", "X-Gm-Features": "AaiRm53kxDCp0TNquO4mv-2Vf-Ifqilpu9Z7oUzXOUOKqitRB46oCGmM6RT8brM", "Message-ID": "\n <CAMe9rOoBUe848b9QMbUZpktxK5XAsFSUa+kDjkKwyOu2u3xBOA@mail.gmail.com>", "Subject": "[PATCH] x86: Don't mark clobbered FLAGS_REG as live", "To": "GCC Patches <gcc-patches@gcc.gnu.org>, Uros Bizjak <ubizjak@gmail.com>,\n Hongtao Liu <hongtao.liu@intel.com>", "Content-Type": "multipart/mixed; boundary=\"000000000000baf193064afebcca\"", "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" }, "content": "Don't mark clobbered FLAGS_REG as live in\n\n(parallel [(set (reg:SI 119)\n (lshiftrt:SI (reg:SI 121)\n (const_int 16 [0x10])))\n (clobber (reg:CC 17 flags))])\n\ngcc/\n\nPR target/124136\n* config/i386/i386-features.cc (ix86_check_flags_reg): Don't\nmark clobbered FLAGS_REG as live.\n\ngcc/testsuite/\n\nPR target/124136\n* g++.target/i386/pr124136.C: New file.", "diff": "From 1da458fe8a15af4b7a34a714b35576b7816c6764 Mon Sep 17 00:00:00 2001\nFrom: \"H.J. Lu\" <hjl.tools@gmail.com>\nDate: Tue, 17 Feb 2026 13:45:09 +0800\nSubject: [PATCH] x86: Don't mark clobbered FLAGS_REG as live\n\nDon't mark clobbered FLAGS_REG as live in\n\n(parallel [(set (reg:SI 119)\n (lshiftrt:SI (reg:SI 121)\n (const_int 16 [0x10])))\n (clobber (reg:CC 17 flags))])\n\ngcc/\n\n\tPR target/124136\n\t* config/i386/i386-features.cc (ix86_check_flags_reg): Don't\n\tmark clobbered FLAGS_REG as live.\n\ngcc/testsuite/\n\n\tPR target/124136\n\t* g++.target/i386/pr124136.C: New file.\n\nSigned-off-by: H.J. Lu <hjl.tools@gmail.com>\n---\n gcc/config/i386/i386-features.cc | 5 +++-\n gcc/testsuite/g++.target/i386/pr124136.C | 29 ++++++++++++++++++++++++\n 2 files changed, 33 insertions(+), 1 deletion(-)\n create mode 100644 gcc/testsuite/g++.target/i386/pr124136.C\n\ndiff --git a/gcc/config/i386/i386-features.cc b/gcc/config/i386/i386-features.cc\nindex d5435f009cb..4e94b2f742e 100644\n--- a/gcc/config/i386/i386-features.cc\n+++ b/gcc/config/i386/i386-features.cc\n@@ -3903,8 +3903,11 @@ ix86_get_dominator_for_reg (unsigned int regno, basic_block bb)\n registers, if DEST is FLAGS register. */\n \n static void\n-ix86_check_flags_reg (rtx dest, const_rtx, void *data)\n+ix86_check_flags_reg (rtx dest, const_rtx x, void *data)\n {\n+ if (GET_CODE (x) == CLOBBER)\n+ return;\n+\n auto_bitmap *live_caller_saved_regs = (auto_bitmap *) data;\n if (REG_P (dest) && REGNO (dest) == FLAGS_REG)\n bitmap_set_bit (*live_caller_saved_regs, FLAGS_REG);\ndiff --git a/gcc/testsuite/g++.target/i386/pr124136.C b/gcc/testsuite/g++.target/i386/pr124136.C\nnew file mode 100644\nindex 00000000000..331ff46bb66\n--- /dev/null\n+++ b/gcc/testsuite/g++.target/i386/pr124136.C\n@@ -0,0 +1,29 @@\n+/* { dg-do compile { target *-*-linux* } } */\n+/* { dg-options \"-O1 -fPIC -fvisibility=internal -mtls-dialect=gnu\" } */\n+\n+__thread int err;\n+bool m;\n+struct Operand {\n+ int : 6;\n+ int kind_ : 10;\n+ int bit_ : 4;\n+ Operand(){};\n+};\n+struct Reg32e : Operand {};\n+Operand mm;\n+void f1();\n+void f(Reg32e B) {\n+ for (;;)\n+ {\n+ Operand &r = B;\n+ m = r.kind_ && r.bit_ & 1;\n+ if (err)\n+ err = 1;\n+ int t = r.bit_;\n+ if (t)\n+ mm = r;\n+ f1();\n+ }\n+}\n+\n+/* { dg-final { scan-assembler-times \"call\\[ \\t\\]__tls_get_addr@PLT\" 1 { target { ! ia32 } } } } */\n-- \n2.53.0\n\n", "prefixes": [] }