mirror of
https://github.com/DrasLorus/CORDIC_Rotate_APFX.git
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25255802f1
- 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.
80 lines
2 KiB
C++
80 lines
2 KiB
C++
/*
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*
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* Copyright 2022 Camille "DrasLorus" Monière.
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*
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* This file is part of CORDIC_Rotate_APFX.
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*
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* This program is free software: you can redistribute it and/or modify it under the terms of the GNU
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* Lesser General Public License as published by the Free Software Foundation, either version 3 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
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* even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License along with this program.
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* If not, see <https://www.gnu.org/licenses/>.
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*
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*/
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#ifndef _ROMCORDIC_DEFINITIONS_HPP_
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#define _ROMCORDIC_DEFINITIONS_HPP_
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#include <cstddef>
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#include <cstdint>
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namespace rom_cordic_rotate {
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#ifdef M_PI
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constexpr double pi = M_PI;
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#else
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constexpr double pi = 3.14159265358979323846;
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#endif
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constexpr double half_pi = pi / 2;
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constexpr double inv_pi = 1 / pi;
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constexpr double two_pi = 2 * pi;
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constexpr double inv_2pi = 0.5 * inv_pi;
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#if XILINX_MAJOR > 2019 || !defined (XILINX_MAJOR)
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constexpr uint32_t needed_bits(uint32_t value) {
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uint32_t result = 0;
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while (value > 0) {
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result++;
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value >>= 1;
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}
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return result;
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}
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constexpr bool is_pow_2(uint32_t value) {
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return (1U << (needed_bits(value) - 1)) == value;
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}
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#endif
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template <uint32_t value>
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constexpr uint32_t needed_bits() { return needed_bits<(value >> 1)>() + 1; }
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template <>
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constexpr uint32_t needed_bits<0>() { return 0; }
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template <>
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constexpr uint32_t needed_bits<1>() { return 1; }
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template <>
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constexpr uint32_t needed_bits<2>() { return 2; }
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template <uint32_t value>
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constexpr bool is_pow_2() {
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return (1U << (needed_bits<value>() - 1)) == value;
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}
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template <>
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constexpr bool is_pow_2<0>() {
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return false;
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}
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} // namespace rom_cordic_rotate
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#endif // _ROMCORDIC_DEFINITIONS_HPP_
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