[PATCH] [AArch64] Lower sdiv x, pow2 using add + select + shift.

[Silviu Baranga]

James,

It seems to me that the branch mispredict cost for the case where the values of X are random would outweigh the benefits of this transformation for your alternative code sequence, even on OoO cores.

I don't think it would entirely ok to make that assumption here (X >= 0 predictable).

This point obviously doesn't matter for the csel solution.

Thanks,
Silviu

http://reviews.llvm.org/D4438