50 lines
1.6 KiB
C++
50 lines
1.6 KiB
C++
// Copyright 2022 The SwiftShader Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "System/CPUID.hpp"
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#include "System/Math.hpp"
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#include "benchmark/benchmark.h"
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#include <limits>
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using namespace sw;
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// Global variable the C++ compiler can't eliminate.
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volatile float y;
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static void Subnormals(benchmark::State &state, bool FTZ, bool DAZ)
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{
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CPUID::setFlushToZero(FTZ);
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CPUID::setDenormalsAreZero(DAZ);
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for(auto _ : state)
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{
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// 2^-64 is a normalized value which when squared produces 2^-128, a denormalized value.
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volatile float x = exp2(-64);
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for(int i = 0; i < state.range(); i++)
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{
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y = x * x;
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}
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}
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CPUID::setFlushToZero(false);
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CPUID::setDenormalsAreZero(false);
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}
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BENCHMARK_CAPTURE(Subnormals, Default, false, false)->Arg(100000)->Unit(benchmark::kMillisecond);
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BENCHMARK_CAPTURE(Subnormals, FlushToZero, true, false)->Arg(100000)->Unit(benchmark::kMillisecond);
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BENCHMARK_CAPTURE(Subnormals, DenormalsAreZero, false, true)->Arg(100000)->Unit(benchmark::kMillisecond);
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BENCHMARK_CAPTURE(Subnormals, FTZ_and_DAZ, true, true)->Arg(100000)->Unit(benchmark::kMillisecond); |