All; The Global code motion are the important optimization that have an impact on register spills and Fetch. Thus The Global code motion takes into account the increase or decrease of register pressure.
Strength Reductions is an important optimization that has an impact on register pressure. The strength reduction Optimizations doesn't take into account the register pressure and especially the strength reduction for induction Variables that are inside the Loops. Loops are the bottleneck for the register pressure and any spill inside the loops Based on strength reduction of induction variables degrades the performance of the Loops. Thus the strength reductions in general and especially the strength reduction for induction variables should take Into account the register pressure based on Live range info. I don't think we do take into account the register pressure for strength reduction optimization in general and especially the Strength reduction based on induction variables. Thanks & Regards Ajit
