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GET /api/1.0/patches/2175300/?format=api
{ "id": 2175300, "url": "http://patchwork.ozlabs.org/api/1.0/patches/2175300/?format=api", "project": { "id": 41, "url": "http://patchwork.ozlabs.org/api/1.0/projects/41/?format=api", "name": "GNU C Library", "link_name": "glibc", "list_id": "libc-alpha.sourceware.org", "list_email": "libc-alpha@sourceware.org", "web_url": "", "scm_url": "", "webscm_url": "" }, "msgid": "<20251217175554.1157780-4-adhemerval.zanella@linaro.org>", "date": "2025-12-17T17:51:49", "name": "[3/8] x86: Do not use __builtin_isinf_sign for _Float64x/long double", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "ff3ec56840102ee7715305b94a0c19061a9faaa1", "submitter": { "id": 66065, "url": "http://patchwork.ozlabs.org/api/1.0/people/66065/?format=api", "name": "Adhemerval Zanella Netto", "email": "adhemerval.zanella@linaro.org" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/glibc/patch/20251217175554.1157780-4-adhemerval.zanella@linaro.org/mbox/", "series": [ { "id": 485739, "url": "http://patchwork.ozlabs.org/api/1.0/series/485739/?format=api", "date": "2025-12-17T17:51:48", "name": "Improve test when building with clang", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/485739/mbox/" } ], "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2175300/checks/", "tags": {}, "headers": { "Return-Path": "<libc-alpha-bounces~incoming=patchwork.ozlabs.org@sourceware.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "libc-alpha@sourceware.org" ], "Delivered-To": [ "patchwork-incoming@legolas.ozlabs.org", "libc-alpha@sourceware.org" ], "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=linaro.org header.i=@linaro.org header.a=rsa-sha256\n header.s=google header.b=Z1s5ZSVi;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=sourceware.org\n (client-ip=38.145.34.32; helo=vm01.sourceware.org;\n envelope-from=libc-alpha-bounces~incoming=patchwork.ozlabs.org@sourceware.org;\n receiver=patchwork.ozlabs.org)", "sourceware.org;\n\tdkim=pass (2048-bit key,\n unprotected) header.d=linaro.org header.i=@linaro.org header.a=rsa-sha256\n header.s=google header.b=Z1s5ZSVi", "sourceware.org;\n dmarc=pass (p=none dis=none) header.from=linaro.org", "sourceware.org; spf=pass smtp.mailfrom=linaro.org", "server2.sourceware.org;\n arc=none smtp.remote-ip=209.85.214.179" ], "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 4dWhPz4MvKz1y0P\n\tfor <incoming@patchwork.ozlabs.org>; Thu, 18 Dec 2025 04:59:19 +1100 (AEDT)", "from vm01.sourceware.org (localhost [127.0.0.1])\n\tby sourceware.org (Postfix) with ESMTP id 8F1B44BA2E21\n\tfor <incoming@patchwork.ozlabs.org>; Wed, 17 Dec 2025 17:59:17 +0000 (GMT)", "from mail-pl1-f179.google.com (mail-pl1-f179.google.com\n [209.85.214.179])\n by sourceware.org (Postfix) with ESMTPS id 172404BA2E24\n for <libc-alpha@sourceware.org>; Wed, 17 Dec 2025 17:56:07 +0000 (GMT)", "by mail-pl1-f179.google.com with SMTP id\n d9443c01a7336-2a0f3f74587so44718725ad.2\n for <libc-alpha@sourceware.org>; Wed, 17 Dec 2025 09:56:07 -0800 (PST)", "from ubuntu-vm.. 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J . Lu\" <hjl.tools@gmail.com>, Collin Funk <collin.funk1@gmail.com>,\n Sam James <sam@gentoo.org>", "Subject": "[PATCH 3/8] x86: Do not use __builtin_isinf_sign for _Float64x/long\n double", "Date": "Wed, 17 Dec 2025 14:51:49 -0300", "Message-ID": "<20251217175554.1157780-4-adhemerval.zanella@linaro.org>", "X-Mailer": "git-send-email 2.43.0", "In-Reply-To": "<20251217175554.1157780-1-adhemerval.zanella@linaro.org>", "References": "<20251217175554.1157780-1-adhemerval.zanella@linaro.org>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-BeenThere": "libc-alpha@sourceware.org", "X-Mailman-Version": "2.1.30", "Precedence": "list", "List-Id": "Libc-alpha mailing list <libc-alpha.sourceware.org>", "List-Unsubscribe": "<https://sourceware.org/mailman/options/libc-alpha>,\n <mailto:libc-alpha-request@sourceware.org?subject=unsubscribe>", "List-Archive": "<https://sourceware.org/pipermail/libc-alpha/>", "List-Post": "<mailto:libc-alpha@sourceware.org>", "List-Help": "<mailto:libc-alpha-request@sourceware.org?subject=help>", "List-Subscribe": "<https://sourceware.org/mailman/listinfo/libc-alpha>,\n <mailto:libc-alpha-request@sourceware.org?subject=subscribe>", "Errors-To": "libc-alpha-bounces~incoming=patchwork.ozlabs.org@sourceware.org" }, "content": "Neither gcc [1] nor clang [2] handles pseudo-normal numbers correctly\nwith the __builtin_isinf_sign, so disable its usage for _Float64x and\nlong double types.\n\nThis only affects x86, so add a new define __FP_BUILTIN_ISINF_SIGN_DENORMAL\nto gate long double and related types to the libc function instead.\n\nIt fixes the regression on test-ldouble-isinf when built with clang:\n\nFailure: isinf (pseudo_zero): Exception \"Invalid operation\" set\nFailure: isinf (pseudo_inf): Exception \"Invalid operation\" set\nFailure: isinf (pseudo_qnan): Exception \"Invalid operation\" set\nFailure: isinf (pseudo_snan): Exception \"Invalid operation\" set\nFailure: isinf (pseudo_unnormal): Exception \"Invalid operation\" set\nFailure: isinf_downward (pseudo_zero): Exception \"Invalid operation\" set\nFailure: isinf_downward (pseudo_inf): Exception \"Invalid operation\" set\nFailure: isinf_downward (pseudo_qnan): Exception \"Invalid operation\" set\nFailure: isinf_downward (pseudo_snan): Exception \"Invalid operation\" set\nFailure: isinf_downward (pseudo_unnormal): Exception \"Invalid operation\" set\nFailure: isinf_towardzero (pseudo_zero): Exception \"Invalid operation\" set\nFailure: isinf_towardzero (pseudo_inf): Exception \"Invalid operation\" set\nFailure: isinf_towardzero (pseudo_qnan): Exception \"Invalid operation\" set\nFailure: isinf_towardzero (pseudo_snan): Exception \"Invalid operation\" set\nFailure: isinf_towardzero (pseudo_unnormal): Exception \"Invalid operation\" set\nFailure: isinf_upward (pseudo_zero): Exception \"Invalid operation\" set\nFailure: isinf_upward (pseudo_inf): Exception \"Invalid operation\" set\nFailure: isinf_upward (pseudo_qnan): Exception \"Invalid operation\" set\nFailure: isinf_upward (pseudo_snan): Exception \"Invalid operation\" set\nFailure: isinf_upward (pseudo_unnormal): Exception \"Invalid operation\" set\n\nChecked on x86_64-linux-gnu with gcc-15 and clang-18.\n\n[1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123173\n[2] https://github.com/llvm/llvm-project/issues/172651\n---\n bits/fp-builtin-denormal.h | 4 ++++\n math/math.h | 5 ++++-\n sysdeps/x86/bits/fp-builtin-denormal.h | 4 ++++\n 3 files changed, 12 insertions(+), 1 deletion(-)", "diff": "diff --git a/bits/fp-builtin-denormal.h b/bits/fp-builtin-denormal.h\nindex 77b7184975..5748eb86f0 100644\n--- a/bits/fp-builtin-denormal.h\n+++ b/bits/fp-builtin-denormal.h\n@@ -26,3 +26,7 @@\n Intel double extended-precision (long double). By default assume 1 to\n enable the usage of compiler builtin on math.h. */\n #define __FP_BUILTIN_FPCLASSIFY_DENORMAL 1\n+\n+/* __FP_BUILTIN_ISINF_SIGN_DENORMAL is defined to 1 if compiler supports\n+ handling pseudo-dernormal numbers with isinf_sign builtin. */\n+#define __FP_BUILTIN_ISINF_SIGN_DENORMAL 1\ndiff --git a/math/math.h b/math/math.h\nindex cbec2f406a..96b64379f7 100644\n--- a/math/math.h\n+++ b/math/math.h\n@@ -1249,7 +1249,10 @@ enum\n ? __isinff128 (x) : __builtin_isinf_sign (x))\n # elif (__GNUC_PREREQ (4,4) && !defined __SUPPORT_SNAN__) \\\n || __glibc_clang_prereq (3,7)\n-# define isinf(x) __builtin_isinf_sign (x)\n+# define isinf(x) __MATH_TG_BUILTIN_CLASSIFY ((x),\t\t\t \\\n+\t\t\t\t\t __builtin_isinf_sign, (x), \\\n+\t\t\t\t\t isinf, (x),\t\t \\\n+\t\t\t\t\t __FP_BUILTIN_ISINF_SIGN_DENORMAL)\n # else\n # define isinf(x) __MATH_TG ((x), __isinf, (x))\n # endif\ndiff --git a/sysdeps/x86/bits/fp-builtin-denormal.h b/sysdeps/x86/bits/fp-builtin-denormal.h\nindex bfb8f54237..2f9a5c7b66 100644\n--- a/sysdeps/x86/bits/fp-builtin-denormal.h\n+++ b/sysdeps/x86/bits/fp-builtin-denormal.h\n@@ -23,3 +23,7 @@\n /* Neither GCC (bug 123161) nor clang (issue 172533) handles pseudo-normal\n numbers correctly with fpclassify builtin. */\n #define __FP_BUILTIN_FPCLASSIFY_DENORMAL 0\n+\n+/* Neither GCC (bug 123173) nor clang (issue 172651) handles pseudo-normal\n+ numbers correctly with isinf_sign builtin. */\n+#define __FP_BUILTIN_ISINF_SIGN_DENORMAL 0\n", "prefixes": [ "3/8" ] }