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GET /api/1.1/patches/2229528/?format=api
{ "id": 2229528, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2229528/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/patch/20260428122436.1476396-1-Raghesh.Aloor@amd.com/", "project": { "id": 17, "url": "http://patchwork.ozlabs.org/api/1.1/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": "<20260428122436.1476396-1-Raghesh.Aloor@amd.com>", "date": "2026-04-28T12:24:36", "name": "[v3] BB SLP: Enabling reduction root finding for sum-of-diff kind of patterns", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "db0e6fa889ee974a309ba4fa9dbffc5e5a382794", "submitter": { "id": 92655, "url": "http://patchwork.ozlabs.org/api/1.1/people/92655/?format=api", "name": "Raghesh Aloor", "email": "Raghesh.Aloor@amd.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/gcc/patch/20260428122436.1476396-1-Raghesh.Aloor@amd.com/mbox/", "series": [ { "id": 501839, "url": "http://patchwork.ozlabs.org/api/1.1/series/501839/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/list/?series=501839", "date": "2026-04-28T12:24:36", "name": "[v3] BB SLP: Enabling reduction root finding for sum-of-diff kind of patterns", "version": 3, "mbox": "http://patchwork.ozlabs.org/series/501839/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2229528/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2229528/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=amd.com header.i=@amd.com header.a=rsa-sha256\n header.s=selector1 header.b=Oz1/mIty;\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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helo=satlexmb07.amd.com; pr=C", "From": "Raghesh Aloor <Raghesh.Aloor@amd.com>", "To": "<gcc-patches@gcc.gnu.org>", "CC": "<rguenther@suse.de>, <venkataramanan.kumar@amd.com>, Raghesh Aloor\n <Raghesh.Aloor@amd.com>", "Subject": "[PATCH v3] BB SLP: Enabling reduction root finding for sum-of-diff\n kind of patterns", "Date": "Tue, 28 Apr 2026 17:54:36 +0530", "Message-ID": "<20260428122436.1476396-1-Raghesh.Aloor@amd.com>", "X-Mailer": "git-send-email 2.34.1", "In-Reply-To": "<2rs266p1-6216-6173-npq6-3889714r8561@fhfr.qr>", "References": "<2rs266p1-6216-6173-npq6-3889714r8561@fhfr.qr>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "Content-Type": "text/plain", "X-Originating-IP": "[10.180.168.240]", "X-ClientProxiedBy": "satlexmb08.amd.com (10.181.42.217) To satlexmb07.amd.com\n (10.181.42.216)", "X-EOPAttributedMessage": "0", "X-MS-PublicTrafficType": "Email", "X-MS-TrafficTypeDiagnostic": "CO1PEPF000066E8:EE_|SJ5PPF0170DF9F2:EE_", "X-MS-Office365-Filtering-Correlation-Id": "1d5e7f5e-ed6b-472f-2a75-08dea5214781", "X-MS-Exchange-SenderADCheck": "1", "X-MS-Exchange-AntiSpam-Relay": "0", "X-Microsoft-Antispam": "BCL:0;\n ARA:13230040|82310400026|1800799024|36860700016|376014|13003099007|22082099003|18002099003|56012099003;", "X-Microsoft-Antispam-Message-Info": "\n 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", "X-Forefront-Antispam-Report": "CIP:165.204.84.17; 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Ip=[165.204.84.17];\n Helo=[satlexmb07.amd.com]", "X-MS-Exchange-CrossTenant-AuthSource": "\n CO1PEPF000066E8.namprd05.prod.outlook.com", "X-MS-Exchange-CrossTenant-AuthAs": "Anonymous", "X-MS-Exchange-CrossTenant-FromEntityHeader": "HybridOnPrem", "X-MS-Exchange-Transport-CrossTenantHeadersStamped": "SJ5PPF0170DF9F2", "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": "Add an optional parameter allow_alt_code to vect_slp_linearize_chain\n(default true). When false, do not follow into MINUS_EXPR when\nbuilding a PLUS reduction chain; treat MINUS results as leaves.\n\nThis will allow \"sum of diffs\" (d_i = a[i]-b[i], sum = d0+...+dN)\nkind of pattern to be recognized and vectorized. Pure PLUS chains\nwill still work; other callers of vect_slp_linearize_chain keep the\ndefault. Once support for MINUS_EXPR in the chain is added, this\ncall site can be switched to allow_alt_code true.\n\ngcc/ChangeLog:\n\n\t* tree-vect-slp.cc (vect_slp_linearize_chain): Optional parameter\n allow_alt_code added (default true), check added not to follow\n MINUS_EXPR, when false\n\t(vect_slp_check_for_roots): Calls vect_slp_linearize_chain with\n parameter allow_alt_code set to false\n\ngcc/testsuite/ChangeLog:\n\n\t* gcc.dg/vect/bb-slp-sum-of-diffs.c: New test.\n\n---\n[Public]\n\nHi Richard,\n\nI have addressed your comments. Added the target string to the test case, removed unwanted spaces and calls vect_slp_linearize_chain with 'false' set to the parameter vect_slp_linearize_chain. Refactoring the code is avoided for now as you suggested.\n\nThe patch is tested using contrib/check_GNU_style.sh and this version is send via git send-email to avoid any indentation errors.\n\nBootstrapped and tested on x86.\n\nThank You,\nRaghesh\n\n .../gcc.dg/vect/bb-slp-sum-of-diffs.c | 25 +++++++++++++++++++\n gcc/tree-vect-slp.cc | 12 ++++++---\n 2 files changed, 33 insertions(+), 4 deletions(-)\n create mode 100644 gcc/testsuite/gcc.dg/vect/bb-slp-sum-of-diffs.c", "diff": "diff --git a/gcc/testsuite/gcc.dg/vect/bb-slp-sum-of-diffs.c b/gcc/testsuite/gcc.dg/vect/bb-slp-sum-of-diffs.c\nnew file mode 100644\nindex 00000000000..6236e31289f\n--- /dev/null\n+++ b/gcc/testsuite/gcc.dg/vect/bb-slp-sum-of-diffs.c\n@@ -0,0 +1,25 @@\n+/* { dg-do compile } */\n+/* { dg-require-effective-target vect_int } */\n+/* { dg-additional-options \"-O3 -fdump-tree-slp2\" } */\n+\n+/* Test that SLP recognizes \"sum of diffs\" (d_i = a[i]-b[i], sum = d0+...+d7)\n+ as a reduction chain and vectorizes the basic block. */\n+\n+int __attribute__((noipa))\n+sum_of_diffs (int *a, int *b)\n+{\n+ int d0 = a[0] - b[0];\n+ int d1 = a[1] - b[1];\n+ int d2 = a[2] - b[2];\n+ int d3 = a[3] - b[3];\n+ int d4 = a[4] - b[4];\n+ int d5 = a[5] - b[5];\n+ int d6 = a[6] - b[6];\n+ int d7 = a[7] - b[7];\n+\n+ int sum = d0 + d1 + d2 + d3 + d4 + d5 + d6 + d7;\n+ return sum;\n+}\n+\n+/* Check that the reduction was SLP-vectorized (REDUC_PLUS appears in the tree). */\n+/* { dg-final { scan-tree-dump \"\\.REDUC_PLUS\" \"slp2\" { target x86_64-*-* aarch64*-*-* } } } */\ndiff --git a/gcc/tree-vect-slp.cc b/gcc/tree-vect-slp.cc\nindex 185ff6fb542..82ab2b7e196 100644\n--- a/gcc/tree-vect-slp.cc\n+++ b/gcc/tree-vect-slp.cc\n@@ -1746,7 +1746,8 @@ dt_sort_cmp (const void *op1_, const void *op2_, void *)\n filling CHAIN with the result and using WORKLIST as intermediate storage.\n CODE_STMT and ALT_CODE_STMT are filled with the first stmt using CODE\n or MINUS_EXPR. *CHAIN_STMTS if not NULL is filled with all computation\n- stmts, starting with START. */\n+ stmts, starting with START. When ALLOW_ALT_CODE is false, do not\n+ follow into MINUS_EXPR when building a PLUS chain (treat MINUS as leaf). */\n \n static void\n vect_slp_linearize_chain (vec_info *vinfo,\n@@ -1754,7 +1755,8 @@ vect_slp_linearize_chain (vec_info *vinfo,\n \t\t\t vec<chain_op_t> &chain,\n \t\t\t enum tree_code code, gimple *start,\n \t\t\t gimple *&code_stmt, gimple *&alt_code_stmt,\n-\t\t\t vec<gimple *> *chain_stmts)\n+\t\t\t vec<gimple *> *chain_stmts,\n+\t\t\t bool allow_alt_code = true)\n {\n /* For each lane linearize the addition/subtraction (or other\n uniform associatable operation) expression tree. */\n@@ -1790,7 +1792,8 @@ vect_slp_linearize_chain (vec_info *vinfo,\n \t && single_imm_use (op, &use_p, &use_stmt)\n \t && is_gimple_assign (def_stmt_info->stmt)\n \t && (gimple_assign_rhs_code (def_stmt_info->stmt) == code\n-\t\t || (code == PLUS_EXPR\n+\t\t || (allow_alt_code\n+\t\t && code == PLUS_EXPR\n \t\t && (gimple_assign_rhs_code (def_stmt_info->stmt)\n \t\t\t == MINUS_EXPR))))\n \t {\n@@ -10049,7 +10052,8 @@ vect_slp_check_for_roots (bb_vec_info bb_vinfo)\n \t continue;\n \t vect_slp_linearize_chain (bb_vinfo, worklist, chain, code, assign,\n \t\t\t\t /* ??? */\n-\t\t\t\t code_stmt, alt_code_stmt, &chain_stmts);\n+\t\t\t\t code_stmt, alt_code_stmt, &chain_stmts,\n+\t\t\t\t false);\n \t if (chain.length () > 1)\n \t {\n \t /* Sort the chain according to def_type and operation. */\n", "prefixes": [ "v3" ] }