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// Copyright (C) 2023 Advanced Micro Devices, Inc. All rights reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#ifndef RTC_TWIDDLE_GEN
#define RTC_TWIDDLE_GEN
#include "rocfft/rocfft.h"
#include <hip/hip_runtime_api.h>
#include <string>
static const unsigned int TWIDDLES_THREADS = 32;
static const unsigned int TWIDDLES_RTC_MAX_RADICES = 8;
static const double TWO_PI = -6.283185307179586476925286766559;
// structure to pass fixed-length array of radices by value in
// kernargs instead of by reference in global memory
struct radices_t
{
size_t data[TWIDDLES_RTC_MAX_RADICES];
};
// stringified version of same structure, for RTC
static const char* radices_t_str{
R"_RADICES_T(
struct radices_t
{
size_t data[TWIDDLES_MAX_RADICES];
};
)_RADICES_T"};
enum struct TwiddleTableType
{
// "stacked" table generated from radices (radices multiply out
// to length N)
RADICES,
// N twiddles for length N
LENGTH_N,
// half-length table for length N
HALF_N,
// "large" twiddle table, decomposed into pow2 base and multiple
// steps
LARGE,
// N * N table for length N partial pass
PARTIAL_PASS_N
};
// generate name for twiddle-compute kernel
std::string twiddle_rtc_kernel_name(TwiddleTableType type, rocfft_precision precision);
// generate source for twiddle-compute kernel
std::string
twiddle_rtc(const std::string& kernel_name, TwiddleTableType type, rocfft_precision precision);
#endif
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