[PATCH] D125774: [InstCombine] fold float trunc into exact itofp for small constants

[Allen zhong via Phabricator via llvm-commits]

Allen updated this revision to Diff 437074.
Allen added a comment.

Add checking the step is loop-invariant, and its loop's trip count is actually related to the PHI


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D125774/new/

https://reviews.llvm.org/D125774

Files:
  llvm/lib/Analysis/ValueTracking.cpp
  llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp
  llvm/test/Transforms/InstCombine/fptrunc.ll
  llvm/test/Transforms/InstCombine/sitofp.ll
  llvm/test/Transforms/LoopVectorize/induction.ll

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