llvm/libc/src/math/generic/erff.cpp

//===-- Single-precision erf(x) function ----------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#include "src/math/erff.h"
#include "src/__support/FPUtil/FPBits.h"
#include "src/__support/FPUtil/PolyEval.h"
#include "src/__support/FPUtil/except_value_utils.h"
#include "src/__support/FPUtil/multiply_add.h"
#include "src/__support/common.h"
#include "src/__support/macros/config.h"
#include "src/__support/macros/optimization.h" // LIBC_UNLIKELY

namespace LIBC_NAMESPACE_DECL {

// Polynomials approximating erf(x)/x on ( k/8, (k + 1)/8 ) generated by Sollya
// with:
// > P = fpminimax(erf(x)/x, [|0, 2, 4, 6, 8, 10, 12, 14|], [|D...|],
//                 [k/8, (k + 1)/8]);
// for k = 0..31.
constexpr double COEFFS[32][8] = …;

LLVM_LIBC_FUNCTION(float, erff, (float x)) { … }

} // namespace LIBC_NAMESPACE_DECL