[PATCH] D118808: Loop Strength Reduce - Optimize unused IVs to final values in the exit block with SCEV

[Zaara Syeda via Phabricator via llvm-commits]

syzaara created this revision.
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Loop strength reduce sometimes optimizes away all uses of an induction variable from a loop but leaves the IV increments. When the only remaining use of the IV is the PHI in the exit block, this patch will use SCEV to replace the exit block PHI with the final value of the IV to skip the updates in each loop iteration.


https://reviews.llvm.org/D118808

Files:
  llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp
  llvm/test/Transforms/LoopStrengthReduce/remove_scev_indvars.ll

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