mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-29 08:11:08 +00:00
50 lines
1.7 KiB
C
50 lines
1.7 KiB
C
/* Single-precision vector (SVE) acosh function
|
|
|
|
Copyright (C) 2024 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/>. */
|
|
|
|
#define One 0x3f800000
|
|
#define Thres 0x20000000 /* asuint(0x1p64) - One. */
|
|
|
|
#include "sv_log1pf_inline.h"
|
|
|
|
static svfloat32_t NOINLINE
|
|
special_case (svfloat32_t x, svfloat32_t y, svbool_t special)
|
|
{
|
|
return sv_call_f32 (acoshf, x, y, special);
|
|
}
|
|
|
|
/* Single-precision SVE acosh(x) routine. Implements the same algorithm as
|
|
vector acoshf and log1p.
|
|
|
|
Maximum error is 2.78 ULPs:
|
|
SV_NAME_F1 (acosh) (0x1.01e996p+0) got 0x1.f45b42p-4
|
|
want 0x1.f45b3cp-4. */
|
|
svfloat32_t SV_NAME_F1 (acosh) (svfloat32_t x, const svbool_t pg)
|
|
{
|
|
svuint32_t ix = svreinterpret_u32 (x);
|
|
svbool_t special = svcmpge (pg, svsub_x (pg, ix, One), Thres);
|
|
|
|
svfloat32_t xm1 = svsub_x (pg, x, 1.0f);
|
|
svfloat32_t u = svmul_x (pg, xm1, svadd_x (pg, x, 1.0f));
|
|
svfloat32_t y = sv_log1pf_inline (svadd_x (pg, xm1, svsqrt_x (pg, u)), pg);
|
|
|
|
if (__glibc_unlikely (svptest_any (pg, special)))
|
|
return special_case (x, y, special);
|
|
return y;
|
|
}
|