llvm-project

507d8233 - [LSR] Use TTI to check if zero-start IV is free in getSetupCost (#190587)

[LSR] Use TTI to check if zero-start IV is free in getSetupCost (#190587) This avoids a downstream regression where LSR prefers {-1,+1}. When constant zero typically doesn't require preheader initialization (queried via TTI::getIntImmCost), consider it as free in getSetupCost. Three test changes are improvements: amx-across-func.ll, 2011-11-29-postincphi.ll and pr62660-normalization-failure.ll. Other test changes are neutral.