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GET /api/1.2/patches/2224732/?format=api
{ "id": 2224732, "url": "http://patchwork.ozlabs.org/api/1.2/patches/2224732/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/patch/3fbf616c-aa2d-9cda-a670-2cf61c3d554c@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": "<3fbf616c-aa2d-9cda-a670-2cf61c3d554c@e124511.cambridge.arm.com>", "list_archive_url": null, "date": "2026-04-18T00:29:17", "name": "[2/7] aarch64: Fix za/zt0 zeroing on function entry", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "dc537f5570b80b8f0446da97c055dc700e4a7c57", "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/3fbf616c-aa2d-9cda-a670-2cf61c3d554c@e124511.cambridge.arm.com/mbox/", "series": [ { "id": 500413, "url": "http://patchwork.ozlabs.org/api/1.2/series/500413/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/list/?series=500413", "date": "2026-04-18T00:27:05", "name": "aarch64: SME ZA/ZT0 fixes", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/500413/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2224732/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2224732/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=j83R8VLc;\n\tdkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com\n header.a=rsa-sha256 header.s=selector1 header.b=j83R8VLc;\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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Ip=[4.158.2.129];\n Helo=[outbound-uk1.az.dlp.m.darktrace.com]", "X-MS-Exchange-CrossTenant-AuthSource": "\n AM3PEPF0000A78F.eurprd04.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": "Usually if za and zt0 are used privately within a function, then they\nare zeroed either by toggling PSTATE.ZA or after committing the lazy\nsave. However, if one of za and zt0 is shared, and the other is used\nprivately, then we need to explicitly zero the private state.\n\ngcc/ChangeLog:\n\n\t* config/aarch64/aarch64.cc (aarch64_expand_prologue): Add\n\tzeroing of za and zt0 when required.\n\ngcc/testsuite/ChangeLog:\n\n\t* gcc.target/aarch64/sme/zt0_state_7.c: New test.", "diff": "diff --git a/gcc/config/aarch64/aarch64.cc b/gcc/config/aarch64/aarch64.cc\nindex 62194b96450840d3bae69636fb04f3d62e516c8d..7b239554daebfbfa145c3a3c7034fa2d8dd7b4e0 100644\n--- a/gcc/config/aarch64/aarch64.cc\n+++ b/gcc/config/aarch64/aarch64.cc\n@@ -10797,6 +10797,18 @@ aarch64_expand_prologue (void)\n if (guard_label)\n \temit_label (guard_label);\n }\n+\n+ /* If both za and zt0 are used, but only one is shared on entry, then we need\n+ to zero the other one. */\n+ if (aarch64_cfun_incoming_pstate_za ())\n+ {\n+ if (!aarch64_cfun_shared_flags (\"za\")\n+\t && aarch64_cfun_has_state (\"za\"))\n+\temit_insn (gen_aarch64_initial_zero_za ());\n+ if (!aarch64_cfun_shared_flags (\"zt0\")\n+\t && aarch64_cfun_has_state (\"zt0\"))\n+\temit_insn (gen_aarch64_sme_zero_zt0 ());\n+ }\n }\n \n /* Return TRUE if we can use a simple_return insn.\ndiff --git a/gcc/testsuite/gcc.target/aarch64/sme/zt0_state_7.c b/gcc/testsuite/gcc.target/aarch64/sme/zt0_state_7.c\nnew file mode 100644\nindex 0000000000000000000000000000000000000000..7a4f00adf7ec26d6acda5200fa9aad3eba17af75\n--- /dev/null\n+++ b/gcc/testsuite/gcc.target/aarch64/sme/zt0_state_7.c\n@@ -0,0 +1,34 @@\n+// { dg-options \"-O3 -fomit-frame-pointer -fno-optimize-sibling-calls\" }\n+// { dg-final { check-function-bodies \"**\" \"\" } }\n+\n+#include <arm_sme.h>\n+\n+#pragma GCC target \"+sme2+sme-lutv2\"\n+\n+/*\n+** foo:\n+**\t...\n+**\tzero\t{ zt0 }\n+**\t...\n+*/\n+__arm_streaming __arm_inout(\"za\") __arm_new(\"zt0\")\n+void foo(void *ptr, float32_t *fp, svfloat32_t z, svuint8_t idx)\n+{\n+ svstr_za (0, ptr);\n+ svst1_f32 (svptrue_b32(), fp, svluti2_lane_zt_f32 (0, idx, 0));\n+}\n+\n+/*\n+** bar:\n+**\t...\n+**\tzero\t{ za }\n+**\t...\n+*/\n+__arm_streaming __arm_new(\"za\") __arm_inout(\"zt0\")\n+void bar(void *ptr, float32_t *fp, svfloat32_t z)\n+{\n+ svstr_zt (0, ptr);\n+ svmopa_za32_f32_m (0, svptrue_b32(), svptrue_b32(), z, z);\n+ svstr_za (0, fp);\n+}\n+\n", "prefixes": [ "2/7" ] }