Hi,

while working on a faster auto-decoding it became oblivous that branch-prediction primitives such as the llvm_expect or builtin_expect are quite useful and should be avilable in a cross-platform compatible way.


I propose to add a new module to to druntime called core.intrinsics that would have functions like
bool likely (bool expr);
bool unlikely (bool expr);
and maybe
void prefetch(void* mem)

Please share your thoughts and tell me what other intrincic functions could/should be added.

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