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// Copyright (c) 2023, ARM Limited.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "generate_dot_product.h"
#include "generate_utils.h"
#include <cstdint>
namespace
{
// Input index global variables
inline constexpr uint32_t P0 = 0;
inline constexpr uint32_t P1 = 1;
// Unused helper function
template <typename... Args>
inline void unused(Args&&...)
{}
// Primitive generator class
//
// Yields a new value on function operator access and increases the
// index by one
class PrimitiveGenerator
{
public:
PrimitiveGenerator(uint32_t S)
: _S(S)
, _m(0)
, _r(0)
, _index(0)
{
_m = (8 * _S + 1) * 0x705A5E75;
_r = _m + 1;
}
[[nodiscard]] float operator()()
{
_r = _r * _m + 1;
float sign = (_r >> 31) == 0 ? +1 : -1;
float pseudo = sign * (float)(_r & 0x7FFFFFFF) / (float)(0x7FFFFFFF);
++_index;
return pseudo;
}
uint32_t index()
{
return _index;
}
private:
uint32_t _S;
uint32_t _m;
uint32_t _r;
uint32_t _index;
};
//----------------------------------------------------------------------------//
// State generators
//----------------------------------------------------------------------------//
// S0 generator
class GeneratorS0 : public TosaReference::IDotProductGenerator
{
public:
GeneratorS0(uint32_t p)
: _p(p)
, _s0(0) // set_data(2*S)
, _s1(1) // set_data(2*S+1)
{}
float operator()(uint32_t k) override
{
unused(k);
const float s0 = _s0();
const float s1 = _s1();
if (_p == P0)
return s0 < 0.f ? 0.f : s1;
else
return s0 < 0.f ? s1 : 0.f;
}
private:
uint32_t _p;
PrimitiveGenerator _s0;
PrimitiveGenerator _s1;
};
} // namespace
namespace TosaReference
{
std::unique_ptr<IDotProductGenerator> pickDotProductGenerator(const GenerateConfig& cfg)
{
const DotProductInfo& dpinfo = cfg.dotProductInfo;
switch (dpinfo.s)
{
case 0:
return std::make_unique<GeneratorS0>(cfg.inputPos);
default:
return nullptr;
}
return nullptr;
}
} // namespace TosaReference
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