CORDIC_Rotate_APFX/RomGenerators/sources/RomRotateCommon/definitions.hpp
Camille Monière 25255802f1
Remove indetermination and patch for Xilinx v2019.1 compatibility
- Use of `rom_cordic_rotate` namespace to isolate functions and
  variables. Useful when CORDICS are included in super project.
- Add define barrier to exclude some code when used when Xilinx v2019.1,
  especially C++11/14 code that are not fully supported by the (crazy)
  old version of GCC in use (v4.6.3).
  Need the definition of `XILINX_MAJOR` (can be done using `set
  XILINX_MAJOR [expr {int( [version -short] )}]` in a Xilinx TCL script
  and then adding it to the cflags using the `-cflags` switch with
  `-DXILINX_MAJOR=${XILINX_MAJOR}` or by manually adding the major
  version to the CFLAGS in gui.
- Add a template version of the helper function, to support v2019.1.
2022-04-25 11:43:31 +02:00

80 lines
2 KiB
C++

/*
*
* Copyright 2022 Camille "DrasLorus" Monière.
*
* This file is part of CORDIC_Rotate_APFX.
*
* This program 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 3 of
* the License, or (at your option) any later version.
*
* This program 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 this program.
* If not, see <https://www.gnu.org/licenses/>.
*
*/
#ifndef _ROMCORDIC_DEFINITIONS_HPP_
#define _ROMCORDIC_DEFINITIONS_HPP_
#include <cstddef>
#include <cstdint>
namespace rom_cordic_rotate {
#ifdef M_PI
constexpr double pi = M_PI;
#else
constexpr double pi = 3.14159265358979323846;
#endif
constexpr double half_pi = pi / 2;
constexpr double inv_pi = 1 / pi;
constexpr double two_pi = 2 * pi;
constexpr double inv_2pi = 0.5 * inv_pi;
#if XILINX_MAJOR > 2019 || !defined (XILINX_MAJOR)
constexpr uint32_t needed_bits(uint32_t value) {
uint32_t result = 0;
while (value > 0) {
result++;
value >>= 1;
}
return result;
}
constexpr bool is_pow_2(uint32_t value) {
return (1U << (needed_bits(value) - 1)) == value;
}
#endif
template <uint32_t value>
constexpr uint32_t needed_bits() { return needed_bits<(value >> 1)>() + 1; }
template <>
constexpr uint32_t needed_bits<0>() { return 0; }
template <>
constexpr uint32_t needed_bits<1>() { return 1; }
template <>
constexpr uint32_t needed_bits<2>() { return 2; }
template <uint32_t value>
constexpr bool is_pow_2() {
return (1U << (needed_bits<value>() - 1)) == value;
}
template <>
constexpr bool is_pow_2<0>() {
return false;
}
} // namespace rom_cordic_rotate
#endif // _ROMCORDIC_DEFINITIONS_HPP_