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6c010c5dde
In TS 18661-1, getpayload had an unspecified return value for a non-NaN argument, while C2x requires the return value -1 in that case. This patch implements the return value of -1. I don't think this is worth having a new symbol version that's an alias of the old one, although occasionally we do that in such cases where the new function semantics are a refinement of the old ones (to avoid programs relying on the new semantics running on older glibc versions but not behaving as intended). Tested for x86_64 and x86; also ran math/ tests for aarch64 and powerpc.
39 lines
1.3 KiB
C
39 lines
1.3 KiB
C
/* Get NaN payload. ldbl-128ibm version.
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Copyright (C) 2016-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <fix-int-fp-convert-zero.h>
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#include <math.h>
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#include <math_private.h>
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#include <stdint.h>
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long double
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__getpayloadl (const long double *x)
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{
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double xhi = ldbl_high (*x);
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uint64_t ix;
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EXTRACT_WORDS64 (ix, xhi);
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if ((ix & 0x7ff0000000000000ULL) != 0x7ff0000000000000ULL
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|| (ix & 0xfffffffffffffULL) == 0)
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return -1;
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ix &= 0x7ffffffffffffULL;
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if (FIX_INT_FP_CONVERT_ZERO && ix == 0)
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return 0.0L;
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return (long double) ix;
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}
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weak_alias (__getpayloadl, getpayloadl)
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