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GET /api/patches/2194974/?format=api
{ "id": 2194974, "url": "http://patchwork.ozlabs.org/api/patches/2194974/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/patch/20260210102706.112930-1-victor.donascimento@arm.com/", "project": { "id": 17, "url": "http://patchwork.ozlabs.org/api/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": "<20260210102706.112930-1-victor.donascimento@arm.com>", "list_archive_url": null, "date": "2026-02-10T10:27:06", "name": "vect: disable vectorization of non-gather elementwise loads [PR124037]", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "40b550eec08be80eba02fc1cd6ab825be9c1f94e", "submitter": { "id": 81143, "url": "http://patchwork.ozlabs.org/api/people/81143/?format=api", "name": "Victor Do Nascimento", "email": "Victor.DoNascimento@arm.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/gcc/patch/20260210102706.112930-1-victor.donascimento@arm.com/mbox/", "series": [ { "id": 491644, "url": "http://patchwork.ozlabs.org/api/series/491644/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/list/?series=491644", "date": "2026-02-10T10:27:06", "name": "vect: disable vectorization of non-gather elementwise loads [PR124037]", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/491644/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2194974/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2194974/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=gE3/TwLU;\n\tdkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com\n header.a=rsa-sha256 header.s=selector1 header.b=gE3/TwLU;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=gcc.gnu.org\n (client-ip=2620:52:6:3111::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": "Victor Do Nascimento <victor.donascimento@arm.com>", "To": "<gcc-patches@gcc.gnu.org>", "CC": "<tamar.christina@arm.com>, <rguenther@suse.de>, Victor Do Nascimento\n <victor.donascimento@arm.com>", "Subject": "[PATCH] vect: disable vectorization of non-gather elementwise loads\n [PR124037]", "Date": "Tue, 10 Feb 2026 10:27:06 +0000", "Message-ID": "<20260210102706.112930-1-victor.donascimento@arm.com>", "X-Mailer": "git-send-email 2.43.0", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "Content-Type": "text/plain", "X-EOPAttributedMessage": "1", "X-MS-TrafficTypeDiagnostic": "\n AMS0EPF000001A7:EE_|AMBPR08MB11653:EE_|AMS0EPF0000019A:EE_|GVXPR08MB7846:EE_", "X-MS-Office365-Filtering-Correlation-Id": "114c97ac-83a5-475e-2f45-08de688f1d0d", "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|36860700013|82310400026|1800799024|376014|13003099007;", "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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Ip=[4.158.2.129];\n Helo=[outbound-uk1.az.dlp.m.darktrace.com]", "X-MS-Exchange-CrossTenant-AuthSource": "\n AMS0EPF0000019A.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": "For the vectorization of non-contiguous memory accesses such as the\nvectorization of loads from a particular struct member, specifically\nwhen vectorizing with unknown bounds (thus using a pointer and not an\narray) it is observed that inadequate alignment checking allows for\nthe crossing of a page boundary within a single vectorized loop\niteration. This leads to potential segmentation faults in the\nresulting binaries.\n\nFor example, for the given datatype:\n\n typedef struct {\n uint64_t a;\n uint64_t b;\n uint32_t flag;\n uint32_t pad;\n } Data;\n\nand a loop such as:\n\nint\nfoo (Data *ptr) {\n if (ptr == NULL)\n return -1;\n\n int cnt;\n for (cnt = 0; cnt < MAX; cnt++) {\n if (ptr->flag == 0)\n break;\n ptr++;\n }\n return cnt;\n}\n\nthe vectorizer yields the following loop logic on armhf:\n\n<bb 1>:\n_41 = ptr_4(D) + 16;\n<bb 2>:\n_44 = MEM[(unsigned int *)ivtmp_42];\nivtmp_45 = ivtmp_42 + 24;\n_46 = MEM[(unsigned int *)ivtmp_45];\nivtmp_47 = ivtmp_45 + 24;\n_48 = MEM[(unsigned int *)ivtmp_47];\nivtmp_49 = ivtmp_47 + 24;\n_50 = MEM[(unsigned int *)ivtmp_49];\nvect_cst__51 = {_44, _46, _48, _50};\nmask_patt_6.17_52 = vect_cst__51 == { 0, 0, 0, 0 };\nif (mask_patt_6.17_52 != { 0, 0, 0, 0 })\n goto <bb 4>;\nelse\n ivtmp_43 = ivtmp_42 + 96;\n goto <bb 2>;\n<bb4>\n...\n\nwithout any proper address alignment checks on the starting address\nor on whether alignment is preserved across iterations.\n\nReject the vectorization of such cases.\n\ngcc/ChangeLog:\n\n\tPR tree-optimization/124037\n\t* tree-vect-stmts.cc (get_load_store_type): Add check for use\n\tcontext of VMAT_ELEMENTWISE loads.\n\ngcc/testsuite/ChangeLog:\n\n\t* gcc.dg/vect/pr123588.c: New.\n---\n gcc/testsuite/gcc.dg/vect/pr124037.c | 57 ++++++++++++++++++++++++++++\n gcc/tree-vect-stmts.cc | 13 +++++++\n 2 files changed, 70 insertions(+)\n create mode 100644 gcc/testsuite/gcc.dg/vect/pr124037.c", "diff": "diff --git a/gcc/testsuite/gcc.dg/vect/pr124037.c b/gcc/testsuite/gcc.dg/vect/pr124037.c\nnew file mode 100644\nindex 00000000000..3121380454b\n--- /dev/null\n+++ b/gcc/testsuite/gcc.dg/vect/pr124037.c\n@@ -0,0 +1,57 @@\n+/* PR tree-optimization/124037 */\n+/* { dg-options \"-O3\" } */\n+/* { dg-require-effective-target mmap } */\n+/* { dg-require-effective-target vect_early_break } */\n+#include <stdint.h>\n+#include <stdio.h>\n+#include <string.h>\n+#include <sys/mman.h>\n+#include <unistd.h>\n+\n+#define MAX 65536\n+\n+typedef struct {\n+ uint64_t a;\n+ uint64_t b;\n+ uint32_t flag;\n+ uint32_t pad;\n+} Data;\n+\n+int __attribute__ ((noinline))\n+foo (Data *ptr) {\n+ if (ptr == NULL)\n+ return -1;\n+\n+ int cnt;\n+ for (cnt = 0; cnt < MAX; cnt++) {\n+ if (ptr->flag == 0)\n+ break;\n+ ptr++;\n+ }\n+ return cnt;\n+}\n+\n+int main() {\n+ long pgsz = sysconf (_SC_PAGESIZE);\n+ if (pgsz == -1) {\n+ fprintf (stderr, \"sysconf failed\\n\");\n+ return 0;\n+ }\n+\n+ /* Allocate 2 consecutive pages. */\n+ void *mem = mmap (NULL, pgsz * 2, PROT_READ | PROT_WRITE,\n+\t\t MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);\n+ if (mem == MAP_FAILED) {\n+ fprintf (stderr, \"mmap failed\\n\");\n+ return 0;\n+ }\n+\n+ memset (mem, 1, pgsz);\n+ uint8_t *ptr = (uint8_t*) mem + pgsz;\n+ memset (ptr - 16, 0, 16);\n+\n+ mprotect (ptr, pgsz, PROT_NONE);\n+ Data *data = (Data *) (ptr - 80);\n+ __builtin_printf(\"%d\\n\", foo(data));\n+}\n+\ndiff --git a/gcc/tree-vect-stmts.cc b/gcc/tree-vect-stmts.cc\nindex ee98e72d1e5..7434d934463 100644\n--- a/gcc/tree-vect-stmts.cc\n+++ b/gcc/tree-vect-stmts.cc\n@@ -2581,6 +2581,19 @@ get_load_store_type (vec_info *vinfo, stmt_vec_info stmt_info,\n \treturn false;\n }\n \n+ if (loop_vinfo\n+ && !inbounds\n+ && dr_safe_speculative_read_required (stmt_info)\n+ && *memory_access_type == VMAT_ELEMENTWISE\n+ && !STMT_VINFO_GATHER_SCATTER_P (stmt_info))\n+ {\n+ if (dump_enabled_p ())\n+\tdump_printf_loc (MSG_MISSED_OPTIMIZATION, vect_location,\n+\t\t\t \"unsafe use of elementwise access for buffer with\"\n+\t\t\t \"unknown bounds\\n\");\n+ return false;\n+ }\n+\n /* If this DR needs alignment for correctness, we must ensure the target\n alignment is a constant power-of-two multiple of the amount read per\n vector iteration or force masking. */\n", "prefixes": [] }