[PATCH] D38339: [LV] Fix PR34711 - handle widening of instruction ranges in the presence of sinking casts

[Ayal Zaks via Phabricator via llvm-commits]

Ayal created this revision.

The "Sink casts to unravel first order recurrence" optimization of r306884 interferes with optimizing VPWidenRecipes for intervals of Instructions. Make sure the LastWidenRecipe we're attempting to extend is indeed the last recipe, covering the previous Instruction; otherwise extending it will effectively hoist the current Instruction, which may un-sink such a cast.


https://reviews.llvm.org/D38339

Files:
  lib/Transforms/Vectorize/LoopVectorize.cpp
  test/Transforms/LoopVectorize/first-order-recurrence.ll

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