我怀疑 C++ 编译者是否会像他们目前对“ 正常” 循环一样, 启动基于范围的循环, 以最大限度地提高性能, 或者在某些情况下, 以范围为基础的循环会比正常循环慢?
非常感谢。
对于以区域为基础的环形环形,等于:
{
auto && __range = ( /expression/ );
for (auto __begin = begin(__range),
__end = end(__range);
__begin != __end;
++__begin) {
/declaration/ = *__begin;
/statement/
}
}
如果汇编者知道迭代次数,并且能够解开循环依赖性或循环是独立的,那么汇编者可以自由拆解。
一般来说,循环解滚只会改善较小的循环的性能。 因此, 国际海事组织( IMO), 基于范围的循环是否被解开并不重要。 您肯定可以用 < code>- O3 < /code > 和 < code>- funroll-loops 以及相关选项来进行基准测试, 看看两者之间是否存在任何差异 。
机会是编译者 翻译以范围为基础 循环到正常的循环对应方 所以我希望它们能等同起来
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