kc3-lang/angle/src/tests/perf_tests/ResultPerf.cpp

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• Hash : 7c985f5c
  Author :
  Date : 2018-11-29T18:16:17
  

  Make angle::Result an enum.
  
  This moves away from a class type to a value type. This should improve
  performance when using angle::Result as a return value. Previously the
  generated code would return a pointer instead of a value.
  
  Improves performance in the most targeted microbenchmark by 10%. In
  more realistic scanarios it will have a smaller improvement. Also
  simplifies the class implementation and usage.
  
  Includes some unrelated code generation changes.
  
  Bug: angleproject:2491
  Change-Id: Ifcf86870bf1c00a2f73c39ea6e4f05ca705050aa
  Reviewed-on: https://chromium-review.googlesource.com/c/1356139
  Commit-Queue: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  

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• src/tests/perf_tests/ResultPerf.cpp

• //
  // Copyright 2018 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  // ResultPerf:
  //   Performance test for ANGLE's Error result class.
  //
  
  #include "ANGLEPerfTest.h"
  #include "libANGLE/Error.h"
  
  volatile int gThing = 0;
  
  namespace
  {
  constexpr int kIterationsPerStep = 1000;
  
  class ResultPerfTest : public ANGLEPerfTest
  {
    public:
      ResultPerfTest();
      void step() override;
  };
  
  ResultPerfTest::ResultPerfTest() : ANGLEPerfTest("ResultPerf", "_run", kIterationsPerStep) {}
  
  ANGLE_NOINLINE angle::Result ExternalCall()
  {
      if (gThing != 0)
      {
          printf("Something very slow");
          return angle::Result::Stop;
      }
      else
      {
          return angle::Result::Continue;
      }
  }
  
  angle::Result CallReturningResult(int depth)
  {
      ANGLE_TRY(ExternalCall());
      ANGLE_TRY(ExternalCall());
      ANGLE_TRY(ExternalCall());
      ANGLE_TRY(ExternalCall());
      ANGLE_TRY(ExternalCall());
      ANGLE_TRY(ExternalCall());
      ANGLE_TRY(ExternalCall());
      ANGLE_TRY(ExternalCall());
      ANGLE_TRY(ExternalCall());
      return ExternalCall();
  }
  
  void ResultPerfTest::step()
  {
      for (int i = 0; i < kIterationsPerStep; i++)
      {
          (void)CallReturningResult(0);
          (void)CallReturningResult(0);
          (void)CallReturningResult(0);
          (void)CallReturningResult(0);
          (void)CallReturningResult(0);
      }
  }
  
  TEST_F(ResultPerfTest, Run)
  {
      run();
  }
  }  // anonymous namespace
  

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