mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-29 16:21:07 +00:00
55 lines
1.9 KiB
C
55 lines
1.9 KiB
C
/* Double-precision vector (SVE) hypot 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/>. */
|
|
|
|
#include "sv_math.h"
|
|
|
|
static const struct data
|
|
{
|
|
uint64_t tiny_bound, thres;
|
|
} data = {
|
|
.tiny_bound = 0x0c80000000000000, /* asuint (0x1p-102). */
|
|
.thres = 0x7300000000000000, /* asuint (inf) - tiny_bound. */
|
|
};
|
|
|
|
static svfloat64_t NOINLINE
|
|
special_case (svfloat64_t sqsum, svfloat64_t x, svfloat64_t y, svbool_t pg,
|
|
svbool_t special)
|
|
{
|
|
return sv_call2_f64 (hypot, x, y, svsqrt_x (pg, sqsum), special);
|
|
}
|
|
|
|
/* SVE implementation of double-precision hypot.
|
|
Maximum error observed is 1.21 ULP:
|
|
_ZGVsMxvv_hypot (-0x1.6a22d0412cdd3p+352, 0x1.d3d89bd66fb1ap+330)
|
|
got 0x1.6a22d0412cfp+352
|
|
want 0x1.6a22d0412cf01p+352. */
|
|
svfloat64_t SV_NAME_D2 (hypot) (svfloat64_t x, svfloat64_t y, svbool_t pg)
|
|
{
|
|
const struct data *d = ptr_barrier (&data);
|
|
|
|
svfloat64_t sqsum = svmla_x (pg, svmul_x (pg, x, x), y, y);
|
|
|
|
svbool_t special = svcmpge (
|
|
pg, svsub_x (pg, svreinterpret_u64 (sqsum), d->tiny_bound), d->thres);
|
|
|
|
if (__glibc_unlikely (svptest_any (pg, special)))
|
|
return special_case (sqsum, x, y, pg, special);
|
|
return svsqrt_x (pg, sqsum);
|
|
}
|