libc/src/math/generic/exp_utils.h

   1 //===-- Collection of utils for exp and friends -----------------*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #ifndef LLVM_LIBC_SRC_MATH_EXP_UTILS_H
  10 #define LLVM_LIBC_SRC_MATH_EXP_UTILS_H
  11
  12 #include <stdint.h>
  13
  14 #define EXP2F_TABLE_BITS 5
  15 #define EXP2F_POLY_ORDER 3
  16 #define N (1 << EXP2F_TABLE_BITS)
  17
  18 namespace __llvm_libc {
  19
  20 struct Exp2fDataTable {
  21   uint64_t tab[1 << EXP2F_TABLE_BITS];
  22   double shift_scaled;
  23   double poly[EXP2F_POLY_ORDER];
  24   double shift;
  25   double invln2_scaled;
  26   double poly_scaled[EXP2F_POLY_ORDER];
  27 };
  28
  29 extern const Exp2fDataTable exp2f_data;
  30
  31 } // namespace __llvm_libc
  32
  33 #endif // LLVM_LIBC_SRC_MATH_EXP_UTILS_H