c++ - pcmpestri instruction to write similar strpos function?

Question

How can the pcmpestri instruction be used to write a function similar to strpos function in C++? I can use g++ compiler.

pcmpestri is a new instruction that is found in SSE4

Answer 1

在使用 SSE 指令之前，您必须存储浮点堆栈，然后再恢复。这是昂贵的，除非你的字符串很大，否则不值得。对于巨大的字符串，更好的算法是要走的路（Boyer-Moore 等）。