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

Silviu Baranga silviu.baranga at gmail.com
Thu Jul 10 03:26:55 PDT 2014


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.



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