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{ "id": 2225410, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2225410/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/patch/aebYiU4PjUorAjcq@cowardly-lion.the-meissners.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": "<aebYiU4PjUorAjcq@cowardly-lion.the-meissners.org>", "date": "2026-04-21T01:53:13", "name": "GCC 17.0 PowerPC: PR 120681: Allow -mcmodel=large with PC relative addressing", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "4bdb02f45490ffeac8427462aad2ddaf433ab71c", "submitter": { "id": 73991, "url": "http://patchwork.ozlabs.org/api/1.1/people/73991/?format=api", "name": "Michael Meissner", "email": "meissner@linux.ibm.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/gcc/patch/aebYiU4PjUorAjcq@cowardly-lion.the-meissners.org/mbox/", "series": [ { "id": 500706, "url": "http://patchwork.ozlabs.org/api/1.1/series/500706/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/list/?series=500706", "date": "2026-04-21T01:53:13", "name": "GCC 17.0 PowerPC: PR 120681: Allow -mcmodel=large with PC relative addressing", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/500706/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2225410/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2225410/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 (2048-bit key;\n unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256\n header.s=pp1 header.b=fmudEzqp;\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=rsa-sha256; d=sourceware.org; s=key; t=1776736401; cv=none;\n b=NOG6uxMstgYRRVelDvLzVL6s80S2DZ2iokoqRhUPfo3jFTygczzOwFT+YEanfG4gE1Wlo98n/N3AEAwEjJ/0yh7qNa4OsC/UavuakBwAaX/c7sFM0wSoM7GiKbJL8lQ7QooC52QvRe74q6HrXjF+Ys4FeaPNOJcg2gCTGm+V1Cw=", "ARC-Message-Signature": "i=1; a=rsa-sha256; d=sourceware.org; s=key;\n t=1776736401; c=relaxed/simple;\n bh=d8iOOy5oPr8jLpkiIGTJQHI94AtoRAyAN7/MfSIuBo4=;\n h=DKIM-Signature:Date:From:To:Subject:Message-ID:MIME-Version;\n b=Do8iWtrtns/8iiBhF0HvpIElweA3FzVoiIez4W6SsgmhSxjQOWzo3HOgrf851YasaBi0athSRv45+vZmFM0nU5AtHN2GQsN8Uu27EKrktHK9QAQWTcmTiHlkE9cdDCuFErm+E5UW/gMBW+aVcM2lWNBbMBdzPFJjNHS2vxi5zpU=", "ARC-Authentication-Results": "i=1; server2.sourceware.org", "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=\n content-type:date:from:in-reply-to:message-id:mime-version\n :references:subject:to; s=pp1; bh=JWtTLh5ckevt74NegbEQ/nX0oV8upt\n L5R7TED2UMkgQ=; b=fmudEzqplvwsISHCnW7pJNSwaKa0n71ElNui7ZLNAmHnuE\n RybwiHi3+fGBjVocFqgUTO1ew7x0EyRTbgGPc63jBZTh/8VWvpIG7Yw+3cHy2Mm3\n sqnBMfMqt4qYxXHKi4x1wnIlieR3dgpjUIPj2I/TYP76pMVlm168KcO72LmBnFap\n +Q2bBhgU5bTloI4YCtiDrFl+CIbq2roenWWcSBz6DWUpCkAQ/aMOM9wcyy0f1CZB\n hGiMmSn9xlPlPwd08ROH+BOHd0CZMSGcTAVMlcR9maelHHbkfGnLUO7dFPcyRsx6\n 6ZxZ3sOIeZQktf09S0ac5QpzSHrdWUQYeNkMZhGw==", "Date": "Mon, 20 Apr 2026 21:53:13 -0400", "From": "Michael Meissner <meissner@linux.ibm.com>", "To": "Michael Meissner <meissner@linux.ibm.com>, gcc-patches@gcc.gnu.org,\n Segher Boessenkool <segher@kernel.crashing.org>,\n jeevitha <jeevitha@linux.ibm.com>,\n Surya Kumari Jangala <jskumari@linux.ibm.com>,\n Kishan Parmar <kishan@linux.ibm.com>,\n Avinash Jayakar <avinashd@linux.ibm.com>,\n Ayappan Perumal <ayappap2@in.ibm.com>,\n Juergen Christ <jchrist@linux.ibm.com>", "Subject": "GCC 17.0 PowerPC: PR 120681: Allow -mcmodel=large with PC relative\n addressing", "Message-ID": "<aebYiU4PjUorAjcq@cowardly-lion.the-meissners.org>", "Mail-Followup-To": "Michael Meissner <meissner@linux.ibm.com>,\n gcc-patches@gcc.gnu.org,\n Segher Boessenkool <segher@kernel.crashing.org>,\n jeevitha <jeevitha@linux.ibm.com>,\n Surya Kumari Jangala <jskumari@linux.ibm.com>,\n Kishan Parmar <kishan@linux.ibm.com>,\n Avinash Jayakar <avinashd@linux.ibm.com>,\n Ayappan Perumal <ayappap2@in.ibm.com>,\n Juergen Christ <jchrist@linux.ibm.com>", "References": "<aebT1QQbPenBOFeH@cowardly-lion.the-meissners.org>\n <aebVA81k-W4V5Z3w@cowardly-lion.the-meissners.org>", "MIME-Version": "1.0", "Content-Type": "text/plain; charset=us-ascii", "Content-Disposition": "inline", "In-Reply-To": "<aebVA81k-W4V5Z3w@cowardly-lion.the-meissners.org>", "X-TM-AS-GCONF": "00", "X-Proofpoint-ORIG-GUID": "wVYLLbTVQxESupXTkm55MXb42D_dYFy-", "X-Proofpoint-Spam-Details-Enc": "AW1haW4tMjYwNDIxMDAxNiBTYWx0ZWRfXyko5hlCdqKV/\n Ey98SnaReR50asEjkK78dz+9xG/RLCwccgKcMagdER2tIylLh7+RFYkqcTmi92XGtP2kr3AnV/q\n ohIsxtDy9bY3VqoeXWQMsSSekTrWeBsrFDBnkXt9hGK+uB50HoqkOvBDXnYU10fBZfT46WZve/Y\n 6AIQufPLsNR5aZtBsM3VnfyOWjvLsmP/4ErOQozfMUwfJachP4Dw8Q5qAw43NxgR063vwZ1u19C\n SrDLAKCAnrqJE3mdTz434OUV60VVdWXVV9cjokYI8ONSXM2sodJUZNxPTHmOEFufAROjF+j2E1G\n scZB0qccY1tWF7+ZzoHYDigl8npfg1icJzjBuqjwAjiVJ7KGJHD5FQ21EZ4ncU3+az27hyIXY/T\n lFcCgsjL3zNUWGHRN+UfEmJhYePrIRZffMKn/OsB8ihgoqHz1pGJpuJ4NCJ8bk21NGZ5pXOp3N8\n z3BPc1eZUJB83pMzIwg==", "X-Authority-Analysis": "v=2.4 cv=PtujqQM3 c=1 sm=1 tr=0 ts=69e6d890 cx=c_pps\n a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17\n a=kj9zAlcOel0A:10 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22\n a=RnoormkPH1_aCDwRdu11:22 a=V8glGbnc2Ofi9Qvn3v5h:22 a=VnNF1IyMAAAA:8\n a=4djbya9me7_U-eBfdz4A:9 a=CjuIK1q_8ugA:10", "X-Proofpoint-GUID": "wVYLLbTVQxESupXTkm55MXb42D_dYFy-", "X-Proofpoint-Virus-Version": "vendor=baseguard\n engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49\n definitions=2026-04-20_05,2026-04-20_02,2025-10-01_01", "X-Proofpoint-Spam-Details": "rule=outbound_notspam policy=outbound score=0\n malwarescore=0 suspectscore=0 clxscore=1015 spamscore=0 impostorscore=0\n priorityscore=1501 bulkscore=0 adultscore=0 lowpriorityscore=0 phishscore=0\n classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0\n reason=mlx scancount=1 engine=8.22.0-2604070000 definitions=main-2604210016", "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": "When I implemented the pc-relative support for power10 in GCC, I\ndisabled using pc-relative support for -mcmodel=large. At the time, I\ndidn't want to dig into the issues. It is now time to allow\n-mcmodel=large to generate pc-relative code.\n\nThis patch allows -mcmodel=large to use prefixed addressing on power10,\npower11, and possibly other future PowerPC processors in addition to\nthe current -mcmodel=medium support.\n\nI have done bootstrap builds on both little endian and big endian\nPowerPC servers with no regressions. Can I check this patch in when\nGCC 17 opens up, and backport it to open older branches after\nappropriate burn-in periods?\n\n2026-04-20 Michael Meissner <meissner@linux.ibm.com>\n\ngcc/\n\n\tPR target/120681\n\t* config/rs6000/linux64.h (PCREL_SUPPORTED_BY_OS): Allow large\n\tcode model as well as medium code model.\n\t* config/rs6000/rs6000.cc (rs6000_option_override_internal):\n\tLikewise.\n\t(rs6000_elf_declare_function_name): Don't create the\n\tlocal/non-local labels for large code model if we are using\n\tPC-relative addressing.\n\ngcc/testsuite/\n\n\tPR target/120681\n\t* gcc.target/powerpc/pr120681.c: New test.\n---\n gcc/config/rs6000/linux64.h | 5 +--\n gcc/config/rs6000/rs6000.cc | 13 +++++---\n gcc/testsuite/gcc.target/powerpc/pr120681.c | 34 +++++++++++++++++++++\n 3 files changed, 45 insertions(+), 7 deletions(-)\n create mode 100644 gcc/testsuite/gcc.target/powerpc/pr120681.c", "diff": "diff --git a/gcc/config/rs6000/linux64.h b/gcc/config/rs6000/linux64.h\nindex 1af71030368..c892930a8a9 100644\n--- a/gcc/config/rs6000/linux64.h\n+++ b/gcc/config/rs6000/linux64.h\n@@ -564,7 +564,8 @@ extern int dot_symbols;\n \n /* Enable using prefixed PC-relative addressing on POWER10 if the ABI\n supports it. The ELF v2 ABI only supports PC-relative relocations for\n- the medium code model. */\n+ the medium/large code models. */\n #define PCREL_SUPPORTED_BY_OS\t(TARGET_POWER10 && TARGET_PREFIXED\t\\\n \t\t\t\t && ELFv2_ABI_CHECK\t\t\t\\\n-\t\t\t\t && TARGET_CMODEL == CMODEL_MEDIUM)\n+\t\t\t\t && (TARGET_CMODEL == CMODEL_MEDIUM\t\\\n+\t\t\t\t || TARGET_CMODEL == CMODEL_LARGE))\ndiff --git a/gcc/config/rs6000/rs6000.cc b/gcc/config/rs6000/rs6000.cc\nindex 4999cb6f54e..73f21c650d9 100644\n--- a/gcc/config/rs6000/rs6000.cc\n+++ b/gcc/config/rs6000/rs6000.cc\n@@ -4358,12 +4358,15 @@ rs6000_option_override_internal (bool global_init_p)\n && (rs6000_isa_flags_explicit & OPTION_MASK_PCREL) == 0)\n rs6000_isa_flags |= OPTION_MASK_PCREL;\n \n- /* -mpcrel requires -mcmodel=medium, but we can't check TARGET_CMODEL until\n- after the subtarget override options are done. */\n- else if (TARGET_PCREL && TARGET_CMODEL != CMODEL_MEDIUM)\n+ /* -mpcrel requires medium or large code models, but we can't check\n+ TARGET_CMODEL until after the subtarget override options are done. */\n+ else if (TARGET_PCREL\n+\t && TARGET_CMODEL != CMODEL_MEDIUM\n+\t && TARGET_CMODEL != CMODEL_LARGE)\n {\n if ((rs6000_isa_flags_explicit & OPTION_MASK_PCREL) != 0)\n-\terror (\"%qs requires %qs\", \"-mpcrel\", \"-mcmodel=medium\");\n+\terror (\"%qs requires %qs or %qs\", \"-mpcrel\", \"-mcmodel=medium\",\n+\t \"-mcmodel=large\");\n \n rs6000_isa_flags &= ~OPTION_MASK_PCREL;\n }\n@@ -21359,7 +21362,7 @@ rs6000_elf_declare_function_name (FILE *file, const char *name, tree decl)\n ASM_OUTPUT_TYPE_DIRECTIVE (file, name, \"function\");\n ASM_DECLARE_RESULT (file, DECL_RESULT (decl));\n \n- if (TARGET_CMODEL == CMODEL_LARGE\n+ if (TARGET_CMODEL == CMODEL_LARGE && !TARGET_PCREL\n && rs6000_global_entry_point_prologue_needed_p ())\n {\n char buf[256];\ndiff --git a/gcc/testsuite/gcc.target/powerpc/pr120681.c b/gcc/testsuite/gcc.target/powerpc/pr120681.c\nnew file mode 100644\nindex 00000000000..d883d1c8a95\n--- /dev/null\n+++ b/gcc/testsuite/gcc.target/powerpc/pr120681.c\n@@ -0,0 +1,34 @@\n+/* { dg-do compile } */\n+/* { dg-require-effective-target powerpc_elfv2 } */\n+/* { dg-require-effective-target powerpc_pcrel } */\n+/* { dg-options \"-mdejagnu-cpu=power10 -O2 -mcmodel=large\" } */\n+\n+/* PR target/120681 -- verify that -mcpu=power10 -mcmodel=large uses PC\n+ relative addressing instead of using TOC addressing. */\n+\n+#ifndef TYPE\n+#define TYPE unsigned long\n+#endif\n+\n+extern TYPE global_var;\n+\n+void\n+set_global (TYPE value)\n+{\n+ /*\n+ * Generate:\n+ * pld 9,global_var@got@pcrel\n+ * std 3,0(9)\n+ *\n+ * Not:\n+ * addis 9,2,.LC0@toc@ha\n+ * ld 9,.LC0@toc@l(9)\n+ * std 3,0(9)\n+ */\n+\n+ global_var = value;\n+}\n+\n+/* { dg-final { scan-assembler {@got@pcrel} } } */\n+/* { dg-final { scan-assembler-not {@toc@ha} } } */\n+/* { dg-final { scan-assembler-not {@toc@l} } } */\n", "prefixes": [] }