On 16 May 2017 at 10:31, Paul Gilmartin < 00000014e0e4a59b-dmarc-requ...@listserv.uga.edu> wrote:
> I have wondered in cases where the programmer knows a priori > that branch taken is more likely whether a branch around a > branch better exploits the branch prediction rules. For > example, instead of: > > BC MASK,TARGET Incorrectly predicts branch not taken > > How about: > > BC 15-MASK,*+8 Correctly predicts branch not taken > B TARGET Correctly predicts branch taken > > Of course it would be better, if practical, to rearrange the code. > Or to use the Branch Prediction [Relative] Preload instruction. Assuming recent hardware, etc. etc. Tony H.
