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60 lines
2.0 KiB
C
60 lines
2.0 KiB
C
/* Single-precision vector (SVE) cosh 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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#include "sv_expf_inline.h"
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static const struct data
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{
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struct sv_expf_data expf_consts;
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uint32_t special_bound;
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} data = {
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.expf_consts = SV_EXPF_DATA,
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/* 0x1.5a92d8p+6: expf overflows above this, so have to use special case. */
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.special_bound = 0x42ad496c,
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};
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static svfloat32_t NOINLINE
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special_case (svfloat32_t x, svfloat32_t y, svbool_t pg)
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{
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return sv_call_f32 (coshf, x, y, pg);
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}
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/* Single-precision vector cosh, using vector expf.
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Maximum error is 1.89 ULP:
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_ZGVsMxv_coshf (-0x1.65898cp+6) got 0x1.f00aep+127
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want 0x1.f00adcp+127. */
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svfloat32_t SV_NAME_F1 (cosh) (svfloat32_t x, svbool_t pg)
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{
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const struct data *d = ptr_barrier (&data);
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svfloat32_t ax = svabs_x (pg, x);
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svbool_t special = svcmpge (pg, svreinterpret_u32 (ax), d->special_bound);
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/* Calculate cosh by exp(x) / 2 + exp(-x) / 2. */
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svfloat32_t t = expf_inline (ax, pg, &d->expf_consts);
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svfloat32_t half_t = svmul_x (pg, t, 0.5);
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svfloat32_t half_over_t = svdivr_x (pg, t, 0.5);
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if (__glibc_unlikely (svptest_any (pg, special)))
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return special_case (x, svadd_x (pg, half_t, half_over_t), special);
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return svadd_x (pg, half_t, half_over_t);
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}
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