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GET /api/1.2/patches/2224731/?format=api
{ "id": 2224731, "url": "http://patchwork.ozlabs.org/api/1.2/patches/2224731/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/patch/700b4a89-6081-9cd6-0e91-0304a15affd9@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": "<700b4a89-6081-9cd6-0e91-0304a15affd9@e124511.cambridge.arm.com>", "list_archive_url": null, "date": "2026-04-18T00:28:52", "name": "[1/7] aarch64: Add ZTO_REGNUM use to movt", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "0bdf0a9499a21a84b3bb74d651d506ef8db35d9e", "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/700b4a89-6081-9cd6-0e91-0304a15affd9@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/2224731/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2224731/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=A3FovoUe;\n\tdkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com\n header.a=rsa-sha256 header.s=selector1 header.b=A3FovoUe;\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 DB1PEPF000509FD.eurprd03.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": "Also replace unspec_volatile with plain unspec - there no need to\nprevent dead code elimination if the dependencies are correct.\n\n---\n\nIf the index is 0, then movt is a destructive instruction, so it should be\npossible to remove the dependency in that case. However, that would be a more\ndisruptive chane, so we can leave it till stage 1.\n\n\ngcc/ChangeLog:\n\n\t* config/aarch64/aarch64-sme.md (aarch64_sme_write_zt): Add\n\tZTO_REGNUM use and make unspec non-volatile.\n\ngcc/testsuite/ChangeLog:\n\n\t* gcc.target/aarch64/sme/zt0_state_8.c: New test.", "diff": "diff --git a/gcc/config/aarch64/aarch64-sme.md b/gcc/config/aarch64/aarch64-sme.md\nindex f24e91997fd640f82c11353dd196fe334daec630..d5564e57bdf130bb51daf5c52be5a743ab32064d 100644\n--- a/gcc/config/aarch64/aarch64-sme.md\n+++ b/gcc/config/aarch64/aarch64-sme.md\n@@ -1067,8 +1067,9 @@\n ;; __arm_streaming __arm_out (\"zt0\");\n (define_insn \"@aarch64_sme_write_zt<SVE_FULL:mode>\"\n [(set (reg:V8DI ZT0_REGNUM)\n-\t(unspec_volatile:V8DI\n-\t [(match_operand:SVE_FULL 0 \"register_operand\" \"w\")\n+\t(unspec:V8DI\n+\t [(reg:V8DI ZT0_REGNUM)\n+\t (match_operand:SVE_FULL 0 \"register_operand\" \"w\")\n \t (match_operand:DI 1 \"const_int_operand\")]\n \t UNSPEC_SME_WRITE))]\n \"TARGET_SME_LUTv2 && TARGET_STREAMING\"\ndiff --git a/gcc/testsuite/gcc.target/aarch64/sme/zt0_state_8.c b/gcc/testsuite/gcc.target/aarch64/sme/zt0_state_8.c\nnew file mode 100644\nindex 0000000000000000000000000000000000000000..8eb3d424f539d8a645a9889f465ac9013048b5f5\n--- /dev/null\n+++ b/gcc/testsuite/gcc.target/aarch64/sme/zt0_state_8.c\n@@ -0,0 +1,14 @@\n+// { dg-options \"-O3 -fomit-frame-pointer -fno-optimize-sibling-calls\" }\n+\n+#include <arm_sme.h>\n+\n+#pragma GCC target \"+sme2+sme-lutv2\"\n+\n+__arm_streaming __arm_inout(\"zt0\")\n+void foo(svfloat32_t z)\n+{\n+ svzero_zt (0);\n+ svwrite_lane_zt_f32 (0, z, 1);\n+}\n+\n+// { dg-final { scan-assembler \"zero\" } }\n", "prefixes": [ "1/7" ] }