Can likely/unlikely macros be used in user-space code?

Question

I came across these 2 macros in Linux kernel code. I know they are instructions to compiler (gcc) for optimizations in case of branching. My question is, can we use these ma

Answer 1

Take a look into What Every Programmer Should Know About Memory under "6.2.2 Optimizing Level 1 Instruction Cache Access" - there's a section about exactly this.