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55 lines
1.9 KiB
C
55 lines
1.9 KiB
C
/* Double-precision vector (SVE) hypot function
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Copyright (C) 2024 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 "sv_math.h"
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static const struct data
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{
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uint64_t tiny_bound, thres;
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} data = {
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.tiny_bound = 0x0c80000000000000, /* asuint (0x1p-102). */
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.thres = 0x7300000000000000, /* asuint (inf) - tiny_bound. */
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};
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static svfloat64_t NOINLINE
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special_case (svfloat64_t sqsum, svfloat64_t x, svfloat64_t y, svbool_t pg,
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svbool_t special)
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{
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return sv_call2_f64 (hypot, x, y, svsqrt_x (pg, sqsum), special);
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}
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/* SVE implementation of double-precision hypot.
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Maximum error observed is 1.21 ULP:
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_ZGVsMxvv_hypot (-0x1.6a22d0412cdd3p+352, 0x1.d3d89bd66fb1ap+330)
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got 0x1.6a22d0412cfp+352
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want 0x1.6a22d0412cf01p+352. */
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svfloat64_t SV_NAME_D2 (hypot) (svfloat64_t x, svfloat64_t y, svbool_t pg)
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{
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const struct data *d = ptr_barrier (&data);
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svfloat64_t sqsum = svmla_x (pg, svmul_x (pg, x, x), y, y);
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svbool_t special = svcmpge (
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pg, svsub_x (pg, svreinterpret_u64 (sqsum), d->tiny_bound), d->thres);
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if (__glibc_unlikely (svptest_any (pg, special)))
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return special_case (sqsum, x, y, pg, special);
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return svsqrt_x (pg, sqsum);
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}
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