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GET /api/1.1/patches/2222383/?format=api
{ "id": 2222383, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2222383/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/patch/20260411111544.78339-1-netanelkomm@gmail.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": "<20260411111544.78339-1-netanelkomm@gmail.com>", "date": "2026-04-11T11:15:44", "name": "match.pd: x != -CST ? x + CST : 0 -> x + CST [PR122996]", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "c2478d59843d4fe7aa3a5959b9a40016f419699a", "submitter": { "id": 92716, "url": "http://patchwork.ozlabs.org/api/1.1/people/92716/?format=api", "name": "Netanel Komm", "email": "netanelkomm@gmail.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/gcc/patch/20260411111544.78339-1-netanelkomm@gmail.com/mbox/", "series": [ { "id": 499549, "url": "http://patchwork.ozlabs.org/api/1.1/series/499549/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/list/?series=499549", "date": "2026-04-11T11:15:44", "name": "match.pd: x != -CST ? x + CST : 0 -> x + CST [PR122996]", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/499549/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2222383/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2222383/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 (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=it5FjDIv;\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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This comes up, for example, when\ndealing with 'rtrim'-style operations.\n\nBootstrapped and regression tested on x86_64-pc-linux-gnu.\n\n\tPR tree-optimization/122996\n\ngcc/ChangeLog:\n\n\t* match.pd (x != CST1 ? x + CST2 : 0 -> x + CST2): New pattern.\n\ngcc/testsuite/ChangeLog:\n\n\t* gcc.dg/tree-ssa/pr122996.c: New test.\n\nSigned-off-by: Netanel Komm <netanelkomm@gmail.com>\n---\n gcc/match.pd | 6 ++++++\n gcc/testsuite/gcc.dg/tree-ssa/pr122996.c | 23 +++++++++++++++++++++++\n 2 files changed, 29 insertions(+)\n create mode 100644 gcc/testsuite/gcc.dg/tree-ssa/pr122996.c", "diff": "diff --git a/gcc/match.pd b/gcc/match.pd\nindex 7b652afb43d..d0f913e640e 100644\n--- a/gcc/match.pd\n+++ b/gcc/match.pd\n@@ -5251,6 +5251,12 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)\n \t&& expr_no_side_effects_p (@1))\n @2)))\n \n+/* x != CST1 ? x + CST2 : 0 -> x + CST2 when CST1 == -CST2. */\n+(simplify\n+ (cond (ne @0 INTEGER_CST@2) (plus@1 @0 INTEGER_CST@3) integer_zerop)\n+ (if (wi::to_wide (@2) == -wi::to_wide (@3))\n+ @1))\n+\n /* Simplifications of shift and rotates. */\n \n (for rotate (lrotate rrotate)\ndiff --git a/gcc/testsuite/gcc.dg/tree-ssa/pr122996.c b/gcc/testsuite/gcc.dg/tree-ssa/pr122996.c\nnew file mode 100644\nindex 00000000000..6cf81aec898\n--- /dev/null\n+++ b/gcc/testsuite/gcc.dg/tree-ssa/pr122996.c\n@@ -0,0 +1,23 @@\n+/* { dg-do compile } */\n+/* { dg-options \"-O2 -fdump-tree-optimized\" } */\n+\n+typedef unsigned char u8;\n+typedef unsigned short u16;\n+typedef unsigned int u32;\n+typedef unsigned long u64;\n+\n+u64 f1 (u64 x) { return x == -1UL ? 0 : x + 1; }\n+\n+u64 f2 (u64 x) { return x != -100UL ? x + 100 : 0; }\n+\n+u64 f3 (u64 x) { return x == 1 ? 0 : x - 1; }\n+\n+u32 f4 (u32 x) { return x == -5 ? 0 : x + 5; }\n+\n+u16 f5 (u16 x) { return x == -30 ? 0 : x + 30; }\n+\n+u8 f6 (u8 x) { return x == 255 ? 0: x + 1; }\n+\n+u64 g1 (u64 x) { return x == 10 ? 0 : x + 1; }\n+\n+/* { dg-final { scan-tree-dump-times \"if \" 1 \"optimized\" } } */\n", "prefixes": [] }