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GET /api/1.1/patches/2227784/?format=api
{ "id": 2227784, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2227784/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/patch/6A1590DC-A623-46DA-BBBA-EE98A19619CB@nvidia.com/", "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": "<6A1590DC-A623-46DA-BBBA-EE98A19619CB@nvidia.com>", "date": "2026-04-24T08:51:29", "name": "aarch64: Update br_mispredict_factor for -mcpu=olympus", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "bdc6a0554e2a0a6a009ac9f3cf92bed438f587dc", "submitter": { "id": 89747, "url": "http://patchwork.ozlabs.org/api/1.1/people/89747/?format=api", "name": "Soumya AR", "email": "soumyaa@nvidia.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/gcc/patch/6A1590DC-A623-46DA-BBBA-EE98A19619CB@nvidia.com/mbox/", "series": [ { "id": 501321, "url": "http://patchwork.ozlabs.org/api/1.1/series/501321/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/list/?series=501321", "date": "2026-04-24T08:51:29", "name": "aarch64: Update br_mispredict_factor for -mcpu=olympus", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/501321/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2227784/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2227784/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=Nvidia.com header.i=@Nvidia.com header.a=rsa-sha256\n header.s=selector2 header.b=UlVozrj0;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=gcc.gnu.org\n (client-ip=38.145.34.32; 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charset=\"us-ascii\"", "Content-ID": "<53C50A0DB5AE25489F73989D5CCEED60@namprd12.prod.outlook.com>", "Content-Transfer-Encoding": "quoted-printable", "MIME-Version": "1.0", "X-OriginatorOrg": "Nvidia.com", "X-MS-Exchange-CrossTenant-AuthAs": "Internal", "X-MS-Exchange-CrossTenant-AuthSource": "IA1PR12MB9531.namprd12.prod.outlook.com", "X-MS-Exchange-CrossTenant-Network-Message-Id": "\n 0455099f-6eae-4aaf-df17-08dea1dead66", "X-MS-Exchange-CrossTenant-originalarrivaltime": "24 Apr 2026 08:51:29.7119 (UTC)", "X-MS-Exchange-CrossTenant-fromentityheader": "Hosted", "X-MS-Exchange-CrossTenant-id": "43083d15-7273-40c1-b7db-39efd9ccc17a", "X-MS-Exchange-CrossTenant-mailboxtype": "HOSTED", "X-MS-Exchange-CrossTenant-userprincipalname": "\n E/gwj9vWTUQOrebJVfg80CLKmRsjbeI2mfMcFXSmfBDt+wgyZkQ5ur/6E2yrUpTdRNNPgOK8ay7Gm3fFN+7GUg==", "X-MS-Exchange-Transport-CrossTenantHeadersStamped": "BY5PR12MB4129", "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": "Hi,\n\nAfter some testing, we have found that a br_mispredict_factor of 7 suits the\nOlympus core more than the default factor of 6 that was proposed in\ngcc.gnu.org/g:d7aebc72899. 6 can be too restrictive on certain workloads and\nreject cheaper csels in favour of conditional branches.\n\nThis change improves SPEC2017 fp rate geomean by 1% while the int rate geomean\nis unchanged. There are no visible regressions >1%.\n\nAdditionally, github.com/facebook/zstd retains the performance improvement this\npatch introduced.\n\nGiven we have now branched to GCC17, is this OK to backport to GCC16?\n\nSigned-off-by: Soumya AR <soumyaa@nvidia.com>\n\ngcc/ChangeLog:\n\n\t* config/aarch64/tuning_models/olympus.h: Update br_mispredict_factor\n\tto 7.\n---\n gcc/config/aarch64/tuning_models/olympus.h | 10 +++++++++-\n 1 file changed, 9 insertions(+), 1 deletion(-)\n\n--\n2.43.0", "diff": "diff --git a/gcc/config/aarch64/tuning_models/olympus.h b/gcc/config/aarch64/tuning_models/olympus.h\nindex c83e35adc2b..fb90a9d4e2c 100644\n--- a/gcc/config/aarch64/tuning_models/olympus.h\n+++ b/gcc/config/aarch64/tuning_models/olympus.h\n@@ -159,6 +159,14 @@ static struct cpu_vector_cost olympus_vector_cost =\n &olympus_vec_issue_info /* issue_info */\n };\n\n+/* Olympus costs for branch instructions. */\n+static const struct cpu_branch_cost olympus_branch_cost =\n+{\n+ 1, /* Predictable. */\n+ 3, /* Unpredictable. */\n+ 7, /* br_mispredict_factor. */\n+};\n+\n /* Olympus prefetch settings (which disable prefetch). */\n static cpu_prefetch_tune olympus_prefetch_tune =\n {\n@@ -533,7 +541,7 @@ static struct tune_params olympus_tunings =\n &generic_armv9_a_addrcost_table,\n &olympus_regmove_cost,\n &olympus_vector_cost,\n- &generic_branch_cost,\n+ &olympus_branch_cost,\n &generic_approx_modes,\n SVE_128, /* sve_width */\n { 4, /* load_int. */\n", "prefixes": [] }