c++ - Is there a simple way to use multiply accumulate in c++?

Question

I've gotten great performance benefit from using the mad function in the c++AMP library. I was wondering if there is a similar function for regular c++ 11? All I found googling was stuff on AVX intrinsics but I'd rather avoid them due to them not being universally supported.

Also, they seem to be all made for processing 4+ mad operations at the same time and I'm not sure that constructing an environment for that to happen while actually just using 1 of them is even efficient.

Answer 1

在 C 和 C++ 中，有 fma 系列的数学函数：

• C：http ://en.cppreference.com/w/c/numeric/math/fma
• C++：http ://en.cppreference.com/w/cpp/numeric/math/fma

由于它们是标准库的一部分，它们应该具有足够的可移植性。