1 /* Table for SVE erff approximation
3 Copyright (C) 2024 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <https://www.gnu.org/licenses/>. */
20 #include "vecmath_config.h"
22 /* Lookup table used in SVE erff.
23 For each possible rounded input r (multiples of 1/128), between
24 r = 0.0 and r = 4.0 (513 values):
25 - __erff_data.erf contains the values of erf(r),
26 - __erff_data.scale contains the values of 2/sqrt(pi)*exp(-r^2).
27 Note that indices 0 and 1 are never hit by the algorithm, since lookup is
28 performed only for x >= 1/64-1/512. */
29 const struct sv_erff_data __sv_erff_data
= {
30 .erf
= { 0x0.000000p
+0,
544 .scale
= { 0x1.20dd76p
+0,
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