{"id":2230355,"url":"http://patchwork.ozlabs.org/api/1.1/patches/2230355/?format=json","web_url":"http://patchwork.ozlabs.org/project/gcc/patch/7dfea11a-e6a8-44a8-90f1-392e29759921@redhat.com/","project":{"id":17,"url":"http://patchwork.ozlabs.org/api/1.1/projects/17/?format=json","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":"<7dfea11a-e6a8-44a8-90f1-392e29759921@redhat.com>","date":"2026-04-29T16:11:09","name":"[pushed,LRA] : Fix a bug in updating live info in rematerialization","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"dd26815e7d3e4663154678788f2b35f3ec7a1dab","submitter":{"id":4455,"url":"http://patchwork.ozlabs.org/api/1.1/people/4455/?format=json","name":"Vladimir Makarov","email":"vmakarov@redhat.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/gcc/patch/7dfea11a-e6a8-44a8-90f1-392e29759921@redhat.com/mbox/","series":[{"id":502103,"url":"http://patchwork.ozlabs.org/api/1.1/series/502103/?format=json","web_url":"http://patchwork.ozlabs.org/project/gcc/list/?series=502103","date":"2026-04-29T16:11:09","name":"[pushed,LRA] : Fix a bug in updating live info in rematerialization","version":1,"mbox":"http://patchwork.ozlabs.org/series/502103/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2230355/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2230355/checks/","tags":{},"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 (1024-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=TgcfK895;\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; 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 (1024-bit key,\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=TgcfK895","sourceware.org; dmarc=pass (p=quarantine dis=none)\n header.from=redhat.com","sourceware.org; spf=pass smtp.mailfrom=redhat.com","server2.sourceware.org;\n arc=none smtp.remote-ip=170.10.129.124"],"Received":["from vm01.sourceware.org (vm01.sourceware.org [38.145.34.32])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519 server-signature ECDSA (secp384r1) server-digest SHA384)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g5MkZ5kGBz1yHZ\n\tfor ; Thu, 30 Apr 2026 02:11:49 +1000 (AEST)","from vm01.sourceware.org (localhost [127.0.0.1])\n\tby sourceware.org (Postfix) with ESMTP id DAD734BAE7E6\n\tfor ; Wed, 29 Apr 2026 16:11:46 +0000 (GMT)","from us-smtp-delivery-124.mimecast.com\n (us-smtp-delivery-124.mimecast.com [170.10.129.124])\n by sourceware.org (Postfix) with ESMTP id 969734BB3BE6\n for ; Wed, 29 Apr 2026 16:11:18 +0000 (GMT)","from mail-qk1-f198.google.com (mail-qk1-f198.google.com\n [209.85.222.198]) by relay.mimecast.com with ESMTP with STARTTLS\n (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id\n us-mta-679-YzGXlgchOkeuz9vcUMl5Lw-1; Wed, 29 Apr 2026 12:11:15 -0400","by mail-qk1-f198.google.com with SMTP id\n af79cd13be357-8cd722c1a69so2346525885a.0\n for ; Wed, 29 Apr 2026 09:11:15 -0700 (PDT)","from [192.168.0.111] (192-0-141-76.cpe.teksavvy.com. 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Makarov \nDate: Wed Apr 29 09:37:11 2026 -0400\n\n [LRA]: Fix a bug in updating live info in rematerialization\n \n LRA rematerialization ignores that a pseudo can require more one hard reg\n when updating live hard reg info. This can result in wrong\n rematerialization. The patch fixes this.\n \n gcc/ChangeLog:\n \n * lra-remat.cc (do_remat): Use the right nregs for pseudo hard reg\n when updating live hard regs.\n\ndiff --git a/gcc/lra-remat.cc b/gcc/lra-remat.cc\nindex c4da3f75e59..20d9f47d2e9 100644\n--- a/gcc/lra-remat.cc\n+++ b/gcc/lra-remat.cc\n@@ -1073,11 +1073,17 @@ do_remat (void)\n CLEAR_HARD_REG_SET (live_hard_regs);\n EXECUTE_IF_SET_IN_BITMAP (df_get_live_in (bb), 0, regno, bi)\n \t{\n-\t int hard_regno = regno < FIRST_PSEUDO_REGISTER\n-\t\t\t ? regno\n-\t\t\t : reg_renumber[regno];\n-\t if (hard_regno >= 0)\n-\t SET_HARD_REG_BIT (live_hard_regs, hard_regno);\n+\t int nregs = 1;\n+\t int hard_regno = regno;\n+\t if (regno >= FIRST_PSEUDO_REGISTER)\n+\t {\n+\t hard_regno = reg_renumber[regno];\n+\t if (hard_regno < 0)\n+\t\tcontinue;\n+\t nregs = hard_regno_nregs (hard_regno, PSEUDO_REGNO_MODE (regno));\n+\t }\n+\t for (int i = 0; i < nregs; i++)\n+\t SET_HARD_REG_BIT (live_hard_regs, hard_regno + i);\n \t}\n bitmap_and (avail_cands, &get_remat_bb_data (bb)->avin_cands,\n \t\t &get_remat_bb_data (bb)->livein_cands);\n","prefixes":["pushed","LRA"]}