Loop Transformations

Within HLO, loop transformation techniques include:

• Loop Permutation or Interchange

• Loop Distribution

• Loop Fusion

• Loop Unrolling

• Data Prefetching

• Scalar Replacement

• Unroll and Jam

• Loop Blocking or Tiling

• Partial-Sum Optimization

• Loadpair Optimization

• Predicate Optimization

• Loop Versioning with Runtime Data-Dependence Check (Itanium®-based systems only)

• Loop Versioning with Low Trip-Count Check

• Loop Reversal

• Profile-Guided Loop Unrolling

• Loop Peeling

• Data Transformation: Malloc Combining and Memset Combining

• Loop Rerolling

• Memset and Memcpy Recognition

• Statement Sinking for Creating Perfect Loopnests