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GET /api/1.2/patches/2225802/?format=api
{ "id": 2225802, "url": "http://patchwork.ozlabs.org/api/1.2/patches/2225802/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/patch/25f50f28-e3fc-64d8-8334-647c1a3317a2@e124511.cambridge.arm.com/", "project": { "id": 17, "url": "http://patchwork.ozlabs.org/api/1.2/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": "<25f50f28-e3fc-64d8-8334-647c1a3317a2@e124511.cambridge.arm.com>", "list_archive_url": null, "date": "2026-04-21T15:58:45", "name": "[v2,2/6] aarch64: Fix ZA state transition [PR119210]", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "293b09f0900f5367618829d754d0b9c45be88901", "submitter": { "id": 90594, "url": "http://patchwork.ozlabs.org/api/1.2/people/90594/?format=api", "name": "Alice Carlotti", "email": "alice.carlotti@arm.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/gcc/patch/25f50f28-e3fc-64d8-8334-647c1a3317a2@e124511.cambridge.arm.com/mbox/", "series": [ { "id": 500843, "url": "http://patchwork.ozlabs.org/api/1.2/series/500843/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/list/?series=500843", "date": "2026-04-21T15:57:04", "name": "aarch64: SME ZA/ZT0 fixes", "version": 2, "mbox": "http://patchwork.ozlabs.org/series/500843/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2225802/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2225802/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=arm.com header.i=@arm.com header.a=rsa-sha256\n header.s=selector1 header.b=avQ/4hwf;\n\tdkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com\n header.a=rsa-sha256 header.s=selector1 header.b=avQ/4hwf;\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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dkim=pass (signature was verified)\n header.d=arm.com;dmarc=pass action=none header.from=arm.com;", "Received-SPF": "Pass (protection.outlook.com: domain of arm.com designates\n 4.158.2.129 as permitted sender) receiver=protection.outlook.com;\n client-ip=4.158.2.129; helo=outbound-uk1.az.dlp.m.darktrace.com; pr=C", "Authentication-Results-Original": "dkim=none (message not signed)\n header.d=none;dmarc=none action=none header.from=arm.com;", "Date": "Tue, 21 Apr 2026 16:58:45 +0100", "From": "Alice Carlotti <alice.carlotti@arm.com>", "To": "gcc-patches@gcc.gnu.org", "Cc": "Richard Sandiford <richard.sandiford@arm.com>,\n Richard Earnshaw <richard.earnshaw@arm.com>,\n Tamar Christina <tamar.christina@arm.com>,\n Kyrylo Tkachov <ktkachov@nvidia.com>, Alex Coplan <alex.coplan@arm.com>,\n Andrew Pinski <andrew.pinski@oss.qualcomm.com>,\n Wilco Dijkstra <wilco.dijkstra@arm.com>", "Subject": "[PATCH v2 2/6] aarch64: Fix ZA state transition [PR119210]", "Message-ID": "<25f50f28-e3fc-64d8-8334-647c1a3317a2@e124511.cambridge.arm.com>", "References": "<9587777e-dc1e-51c2-0c33-d1192dfc568d@e124511.cambridge.arm.com>", "Content-Type": "text/plain; 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Ip=[4.158.2.129];\n Helo=[outbound-uk1.az.dlp.m.darktrace.com]", "X-MS-Exchange-CrossTenant-AuthSource": "\n DB5PEPF00014B9F.eurprd02.prod.outlook.com", "X-MS-Exchange-CrossTenant-AuthAs": "Anonymous", "X-MS-Exchange-CrossTenant-FromEntityHeader": "HybridOnPrem", "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": "In the INACTIVE_CALLER -> INACTIVE LOCAL transition, ensure ZA is active\nand zeroed before setting tpidr2_el0.\n\ngcc/ChangeLog:\n\n\tPR target/119210\n\t* config/aarch64/aarch64.cc (aarch64_mode_emit_local_sme_state):\n\tAdd PSTATE.ZA enablement, and zero it if already enabled.\n\ngcc/testsuite/ChangeLog:\n\n\tPR target/119210\n\t* gcc.target/aarch64/sme/za_state_8.c: New test.", "diff": "diff --git a/gcc/config/aarch64/aarch64.cc b/gcc/config/aarch64/aarch64.cc\nindex 62194b96450840d3bae69636fb04f3d62e516c8d..693ce8b4d25cd8cef03e415ea1c033cb9311cb21 100644\n--- a/gcc/config/aarch64/aarch64.cc\n+++ b/gcc/config/aarch64/aarch64.cc\n@@ -31951,7 +31951,8 @@ aarch64_mode_emit_local_sme_state (aarch64_local_sme_state mode,\n emit_insn (gen_aarch64_tpidr2_save ());\n emit_insn (gen_aarch64_clear_tpidr2 ());\n if (mode == aarch64_local_sme_state::ACTIVE_LIVE\n-\t || mode == aarch64_local_sme_state::ACTIVE_DEAD)\n+\t || mode == aarch64_local_sme_state::ACTIVE_DEAD\n+\t || mode == aarch64_local_sme_state::INACTIVE_LOCAL)\n \t{\n \t if (aarch64_cfun_has_state (\"za\"))\n \t emit_insn (gen_aarch64_initial_zero_za ());\n@@ -32033,6 +32034,16 @@ aarch64_mode_emit_local_sme_state (aarch64_local_sme_state mode,\n \n if (mode == aarch64_local_sme_state::INACTIVE_LOCAL)\n {\n+ if (prev_mode == aarch64_local_sme_state::INACTIVE_CALLER)\n+\t/* Enable ZA (if it wasn't already enabled on entry). Enabling ZA has\n+\t the side-effect of zeroing ZA.\n+\n+\t A functionally correct alternative would be to leave TPIDR2_EL0 null\n+\t and zero the save buffer. However, zeroing the save buffer would require\n+\t more code and would optimize for the case in which a callee also\n+\t initialises private ZA state (which should be a rare event). */\n+\temit_insn (gen_aarch64_smstart_za ());\n+\n if (prev_mode == aarch64_local_sme_state::ACTIVE_LIVE\n \t || prev_mode == aarch64_local_sme_state::ACTIVE_DEAD\n \t || prev_mode == aarch64_local_sme_state::INACTIVE_CALLER)\ndiff --git a/gcc/testsuite/gcc.target/aarch64/sme/za_state_8.c b/gcc/testsuite/gcc.target/aarch64/sme/za_state_8.c\nnew file mode 100644\nindex 0000000000000000000000000000000000000000..9b7a6ffa69cbce1969d40f9d69a76522c0e439c5\n--- /dev/null\n+++ b/gcc/testsuite/gcc.target/aarch64/sme/za_state_8.c\n@@ -0,0 +1,25 @@\n+// { dg-options \"-O -fomit-frame-pointer -fno-optimize-sibling-calls\" }\n+// { dg-final { check-function-bodies \"**\" \"\" } }\n+\n+#include <arm_sme.h>\n+\n+void callee_ns();\n+__arm_streaming __arm_inout(\"za\") void callee_s();\n+\n+/*\n+** foo:\n+**\t...\n+**\tsmstart\tza\n+**\t...\n+**\tmsr\ttpidr2_el0, x\\d+\n+**\t...\n+*/\n+__arm_locally_streaming __arm_new(\"za\") const float * foo(const float* x) {\n+ callee_ns ();\n+ const float32_t *x_f_in = x;\n+ svzero_za();\n+ callee_s ();\n+ return x_f_in;\n+}\n+\n+\n", "prefixes": [ "v2", "2/6" ] }