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/* Single-precision SVE log1p
Copyright (C) 2023-2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include "sv_math.h"
#include "sv_log1pf_inline.h"
static svfloat32_t NOINLINE
special_case (svfloat32_t x, svbool_t special)
{
return sv_call_f32 (log1pf, x, sv_log1pf_inline (x, svptrue_b32 ()),
special);
}
/* Vector log1pf approximation using polynomial on reduced interval. Worst-case
error is 1.27 ULP very close to 0.5.
_ZGVsMxv_log1pf(0x1.fffffep-2) got 0x1.9f324p-2
want 0x1.9f323ep-2. */
svfloat32_t SV_NAME_F1 (log1p) (svfloat32_t x, svbool_t pg)
{
/* x < -1, Inf/Nan. */
svbool_t special = svcmpeq (pg, svreinterpret_u32 (x), 0x7f800000);
special = svorn_z (pg, special, svcmpge (pg, x, -1));
if (__glibc_unlikely (svptest_any (pg, special)))
return special_case (x, special);
return sv_log1pf_inline (x, pg);
}
strong_alias (SV_NAME_F1 (log1p), SV_NAME_F1 (logp1))
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