平方根(sqrt)の計算速度を調べる。
double型とfloat型で速度に違いが出るか?
測定結果
x86 | x64 | |
---|---|---|
double | 735ミリ秒 | 1172ミリ秒 |
float | 906ミリ秒 | 938ミリ秒 |
x86 の方が double が速くて、x64 では float の計算が速かった。
x64 では float を引数にとる sqrtf が定義されているが、x86 では、sqrtf は内部で sqrt(double を引数にとる)が呼ばれていた。
double型とfloat型の計算速度(sqrt)を測定する
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