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optimized while loop c++

Stupid Skylark answered on November 20, 2022 Popularity 2/10 Helpfulness 1/10

answer optimized while loop c++

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optimized while loop c++

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#include <vector>
#include <cmath>

// fails to vectorise in Visual C++ and /O2
void func1(std::vector<float>& v)
{
  for(size_t i = 0; i < v.size(); ++i)
  {
    v[i] = std::sqrt(v[i]);
  }
}

// this will vectorise with sqrtps
void func2(std::vector<float>& v)
{
  for(std::vector<float>::iterator it = v.begin(), e = v.end(); it != e; ++it)
  {
    *it = std::sqrt(*it);
  }
}

Popularity 2/10 Helpfulness 1/10 Language cpp

Source: stackoverflow.com

Tags: c++ while-loop

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Contributed on Nov 20 2022

Stupid Skylark

0 Answers Avg Quality 2/10

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optimized while loop c++

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struct Foo
{
  void func3();
  void func4();
  std::vector<float> v;
  float f;
};

// will not vectorise
void Foo::func3()
{
  // this->v.end() !!
  for(std::vector<float>::iterator it = v.begin(); it != v.end(); ++it)
  {
    *it *= f;  // this->f !!
  }
}

void Foo::func4()
{
  // you need to take a local copy of v.end(), and 'f'.
  const float temp = f;
  for(std::vector<float>::iterator it = v.begin(), e = v.end(); it != e; ++it)
  {
    *it *= temp;
  }
}

Popularity 1/10 Helpfulness 1/10 Language cpp

Source: stackoverflow.com

Tags: while-loop c++

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Contributed on Nov 20 2022

Stupid Skylark

0 Answers Avg Quality 2/10

optimized while loop c++

Comment

-Rpass-missed=loop-vectorize
  -Rpass-analysis=loop-vectorize

Popularity 1/10 Helpfulness 1/10 Language cpp

Source: stackoverflow.com

Tags: c++ while-loop

Link to this answer
Share Copy Link

Contributed on Nov 20 2022

Stupid Skylark

0 Answers Avg Quality 2/10

optimized while loop c++

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