mirror of git://sourceware.org/git/glibc.git
47 lines
1.6 KiB
C
47 lines
1.6 KiB
C
/* Single-precision SVE log1p
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Copyright (C) 2023-2025 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_log1pf_inline.h"
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static svfloat32_t NOINLINE
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special_case (svfloat32_t x, svbool_t special)
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{
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return sv_call_f32 (log1pf, x, sv_log1pf_inline (x, svptrue_b32 ()),
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special);
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}
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/* Vector log1pf approximation using polynomial on reduced interval. Worst-case
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error is 1.27 ULP very close to 0.5.
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_ZGVsMxv_log1pf(0x1.fffffep-2) got 0x1.9f324p-2
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want 0x1.9f323ep-2. */
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svfloat32_t SV_NAME_F1 (log1p) (svfloat32_t x, svbool_t pg)
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{
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/* x < -1, Inf/Nan. */
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svbool_t special = svcmpeq (pg, svreinterpret_u32 (x), 0x7f800000);
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special = svorn_z (pg, special, svcmpge (pg, x, -1));
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if (__glibc_unlikely (svptest_any (pg, special)))
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return special_case (x, special);
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return sv_log1pf_inline (x, pg);
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}
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strong_alias (SV_NAME_F1 (log1p), SV_NAME_F1 (logp1))
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