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GET /api/1.0/patches/2175753/?format=api
{ "id": 2175753, "url": "http://patchwork.ozlabs.org/api/1.0/patches/2175753/?format=api", "project": { "id": 17, "url": "http://patchwork.ozlabs.org/api/1.0/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": "<20251218211109.3562-7-chris.bazley@arm.com>", "date": "2025-12-18T21:11:04", "name": "[v7,06/10] Handle variable-length vector types in store_constructor", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "7ee37e6613f079d703232ddfb5eec629e966a7fe", "submitter": { "id": 89471, "url": "http://patchwork.ozlabs.org/api/1.0/people/89471/?format=api", "name": "Christopher Bazley", "email": "Chris.Bazley@arm.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/gcc/patch/20251218211109.3562-7-chris.bazley@arm.com/mbox/", "series": [ { "id": 485915, "url": "http://patchwork.ozlabs.org/api/1.0/series/485915/?format=api", "date": "2025-12-18T21:10:58", "name": "Extend BB SLP vectorization to use predicated tails", "version": 7, "mbox": "http://patchwork.ozlabs.org/series/485915/mbox/" } ], "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2175753/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 (1024-bit key;\n unprotected) header.d=arm.com header.i=@arm.com header.a=rsa-sha256\n header.s=selector1 header.b=XhQW6T7X;\n\tdkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com\n header.a=rsa-sha256 header.s=selector1 header.b=XhQW6T7X;\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;", "spf=pass (sender IP is 172.205.89.229)\n smtp.mailfrom=arm.com; dkim=none (message not signed)\n header.d=none;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", "Pass (protection.outlook.com: domain of arm.com designates\n 172.205.89.229 as permitted sender) receiver=protection.outlook.com;\n client-ip=172.205.89.229; helo=nebula.arm.com; pr=C" ], "From": "Christopher Bazley <chris.bazley@arm.com>", "To": "<gcc-patches@gcc.gnu.org>", "Subject": "[PATCH v7 06/10] Handle variable-length vector types in\n store_constructor", "Date": "Thu, 18 Dec 2025 21:11:04 +0000", "Message-ID": "<20251218211109.3562-7-chris.bazley@arm.com>", "X-Mailer": "git-send-email 2.43.0", "In-Reply-To": "<20251218211109.3562-1-chris.bazley@arm.com>", "References": "<20251218211109.3562-1-chris.bazley@arm.com>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "Content-Type": "text/plain", "X-EOPAttributedMessage": "1", "X-MS-TrafficTypeDiagnostic": "\n DB1PEPF0003922D:EE_|AM9PR08MB5937:EE_|AM2PEPF0001C711:EE_|AM0PR08MB5313:EE_", "X-MS-Office365-Filtering-Correlation-Id": "2cee3ef9-9b71-4b40-92ab-08de3e7a3064", "x-checkrecipientrouted": "true", "NoDisclaimer": "true", "X-MS-Exchange-SenderADCheck": "1", "X-MS-Exchange-AntiSpam-Relay": "0", "X-Microsoft-Antispam-Untrusted": "BCL:0;\n ARA:13230040|82310400026|36860700013|1800799024|376014;", "X-Microsoft-Antispam-Message-Info-Original": "\n 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", "X-Forefront-Antispam-Report-Untrusted": "CIP:172.205.89.229; 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CTRY:GB; LANG:en; SCL:1; SRV:;\n IPV:NLI; SFV:NSPM; H:outbound-uk1.az.dlp.m.darktrace.com;\n PTR:InfoDomainNonexistent; CAT:NONE;\n SFS:(13230040)(36860700013)(376014)(35042699022)(82310400026)(1800799024)(14060799003);\n DIR:OUT; SFP:1101;", "X-OriginatorOrg": "arm.com", "X-MS-Exchange-CrossTenant-OriginalArrivalTime": "18 Dec 2025 21:12:45.1614 (UTC)", "X-MS-Exchange-CrossTenant-Network-Message-Id": "\n 2cee3ef9-9b71-4b40-92ab-08de3e7a3064", "X-MS-Exchange-CrossTenant-Id": "f34e5979-57d9-4aaa-ad4d-b122a662184d", "X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp": "\n TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d; Ip=[4.158.2.129];\n Helo=[outbound-uk1.az.dlp.m.darktrace.com]", "X-MS-Exchange-CrossTenant-AuthSource": "\n AM2PEPF0001C711.eurprd05.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": "When given a constructor of variable-length vector type, the\nstore_constructor function now builds a vector with the number of\nelements specified by the constructor and uses it to emit the body\nof the kind of insn chosen by the convert_optab_handler function.\nPreviously, this function used a fallback path of calling\nstore_constructor_field upon discovering that the number of subparts\nin the vector type was not a constant multiple of the number of\nsubparts in the element type.\n\nFor example, this allows GCC to generate the following AArch64 assembly\nlanguage output for the tail of a reduction in the slp_6 test:\n\nuaddv d31, p6, z31.b\nuaddv d27, p6, z27.b\nuaddv d26, p6, z26.b\nmovi d30, #0\ninsr z30.b, b26\ninsr z30.b, b27\ninsr z30.b, b31\nadd z25.b, z25.b, z30.b\n\ninstead of the following output (with predicated tails for basic block\nSLP vectorization but without this change):\n\naddvl x0, sp, #2\nmovi d0, #0\nst1b z0.b, p6, [sp, #2, mul vl]\nuaddv d27, p6, z27.b\nuaddv d26, p6, z26.b\nuaddv d25, p6, z25.b\nstr b27, [x0]\naddvl x0, sp, #1\nadd x0, x0, 1\nptrue p7.b, vl3\nld1b z0.b, p6/z, [sp, #2, mul vl]\nst1b z0.b, p6, [sp, #1, mul vl]\nstr b26, [x0]\nld1b z0.b, p6/z, [sp, #1, mul vl]\nst1b z0.b, p6, [sp]\nstr b25, [sp, 2]\nld1b z0.b, p6/z, [sp]\nadd z28.b, z28.b, z0.b\nst1b z28.b, p7, [x1]\naddvl sp, sp, #3\n\nor the original assembly language output (with neither predicated tails\nfor basic block SLP vectorization nor this change):\n\nuaddv d31, p6, z31.b\nfmov x0, d31\nuaddv d31, p6, z26.b\nadd w6, w6, w0\nfmov x0, d31\nuaddv d31, p6, z27.b\nadd w5, w5, w0\nfmov x0, d31\nadd w4, w4, w0\n\ngcc/ChangeLog:\n\n\t* expr.cc (store_constructor): Add an else block to handle\n\tcases of TREE_CODE (TREE_TYPE (exp)) == VECTOR_TYPE in which\n\texact_div (n_elts, GET_MODE_NUNITS (eltmode)).is_constant\n\t(&const_n_elts) is false similar to the existing \"element type\n\tis not a vector type\" case except that const_n_elts is taken\n\tfrom the constructor instead of the subparts of the vector\n\ttype.\n\n---\n gcc/expr.cc | 7 ++++++-\n 1 file changed, 6 insertions(+), 1 deletion(-)", "diff": "diff --git a/gcc/expr.cc b/gcc/expr.cc\nindex 7d84ad9e6fc..622c5be1d59 100644\n--- a/gcc/expr.cc\n+++ b/gcc/expr.cc\n@@ -8058,7 +8058,12 @@ store_constructor (tree exp, rtx target, int cleared, poly_int64 size,\n \t\t similarly non-const type vectors. */\n \t\ticode = convert_optab_handler (vec_init_optab, mode, eltmode);\n \t }\n-\n+\t else\n+\t {\n+\t\t/* Handle variable-length vector types. */\n+\t\ticode = convert_optab_handler (vec_init_optab, mode, eltmode);\n+\t\tconst_n_elts = CONSTRUCTOR_NELTS (exp);\n+\t }\n \t if (const_n_elts && icode != CODE_FOR_nothing)\n \t {\n \t vector = rtvec_alloc (const_n_elts);\n", "prefixes": [ "v7", "06/10" ] }