[{"id":3679558,"web_url":"http://patchwork.ozlabs.org/comment/3679558/","msgid":"<8e96798b-cfa6-4a37-9623-7679ea0babc2@qti.qualcomm.com>","list_archive_url":null,"date":"2026-04-20T19:49:38","subject":"Re: [PATCH] PR tree-optimization/124715: pow(0, -1) sets errno with\n -fmath-errno","submitter":{"id":92871,"url":"http://patchwork.ozlabs.org/api/people/92871/","name":"Jeffrey Law","email":"jefflaw@qti.qualcomm.com"},"content":"On 4/19/2026 12:33 PM, Roger Sayle wrote:\n> This patch addresses PR tree-optimization/124715, where it is unsafe for\n> GCC (specifically match.pd) to transform pow(x,-1) into 1.0/x if x may be\n> zero, which sets errno, unless -fno-math-errno (included in -ffast-math)\n> is specified.\n>\n> This patch has been tested on x86_64-pc-linux-gnu with make bootstrap\n> and make -k check, with no new failures. Ok for mainline or stage 1?\n>\n>\n> 2026-04-19 Roger Sayle \n>\n> gcc/ChangeLog\n> PR tree-optimization/124715\n> * match.pd (simpify pows): Check flag_errno_math before simplifying\n> pow(x,-1) -> 1/x when x could be zero.\n>\n> gcc/testsuite/ChangeLog\n> PR tree-optimization/124715\n> * gcc.dg/no-math-errno-5.c: New test case.\n> * gcc.dg/no-math-errno-6.c: Likewise.\nOK once gcc -17 is open for development.\njeff","headers":{"Return-Path":"","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=qualcomm.com header.i=@qualcomm.com header.a=rsa-sha256\n header.s=qcppdkim1 header.b=UxCClUrW;\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; helo=vm01.sourceware.org;\n envelope-from=gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org;\n receiver=patchwork.ozlabs.org)","sourceware.org;\n\tdkim=pass (2048-bit key,\n unprotected) header.d=qualcomm.com header.i=@qualcomm.com header.a=rsa-sha256\n header.s=qcppdkim1 header.b=UxCClUrW","sourceware.org; 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s=\n qcppdkim1; bh=9JpU48uNDQsXiADTTRjFtQWSSD9sJqQqXGEV8ysYIUU=; b=Ux\n CClUrW+BxSO9wzhum+OWAjzUxQiJR3gpVRcYu15ccl85IXXScgrc488NNOmxQb0r\n krn3ufeH+IuAeqqk7qkWBHrJj3AfzEf62n6fQ/0Z8vTKbvVQp06XXISTTyusMRVA\n 8c8jXIJTALPQ2Fd7ywll9NFndtNn5I9Wfm8ipX7KFT97rHcx7eQGH33AiG/6WwHs\n VRZ+K9YKM3pL1kdnZZn+GVyTa5VtLqmiGVt262kCIu1rrbbKD8anef9h0WD+06i/\n bC06nf9m2DMjH2Bai1SwtVxk6SX8hpoojTARD2afrhyuVEwmK6jjNoCjxk4Gn2Jl\n 3Ue7cTzJqhOhsqVXTSbg==","From":"Jeffrey Law ","To":"Roger Sayle , 'GCC Patches'\n ","Subject":"Re: [PATCH] PR tree-optimization/124715: pow(0, -1) sets errno with\n -fmath-errno","Thread-Topic":"[PATCH] PR tree-optimization/124715: pow(0, -1) sets errno with\n -fmath-errno","Thread-Index":"AQHc0P7SxsPc+sKeeE6RCyILnWFhog==","Date":"Mon, 20 Apr 2026 19:49:38 +0000","Message-ID":"<8e96798b-cfa6-4a37-9623-7679ea0babc2@qti.qualcomm.com>","References":"<008301dcd02b$1253b880$36fb2980$@nextmovesoftware.com>","In-Reply-To":"<008301dcd02b$1253b880$36fb2980$@nextmovesoftware.com>","Accept-Language":"en-US","Content-Language":"en-US","X-MS-Has-Attach":"","X-MS-TNEF-Correlator":"","x-ms-publictraffictype":"Email","x-ms-traffictypediagnostic":"LV2PR02MB11156:EE_|DM4PR02MB9072:EE_","x-ms-office365-filtering-correlation-id":"3bcd47c3-0304-4c4f-ca0e-08de9f15f506","x-ms-exchange-senderadcheck":"1","x-ms-exchange-antispam-relay":"0","x-microsoft-antispam":"BCL:0;\n ARA:13230040|366016|376014|1800799024|38070700021|22082099003|18002099003|56012099003;","x-microsoft-antispam-message-info":"\n 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","x-forefront-antispam-report":"CIP:255.255.255.255; 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