[PATCH] D38961: [PowerPC] Increase the user cost of vector instructions by their legalization cost

[Brad Nemanich via Phabricator via llvm-commits]

bnemanich created this revision.
Herald added subscribers: kbarton, nemanjai.

The cost of splitting a large vector instruction is not being taken into account by the getUserCost function. This was leading to some loops being over unrolled. The cost of a vector instruction is now being multiplied by the cost of the type legalization. This will return a more accurate cost.


https://reviews.llvm.org/D38961

Files:
  lib/Target/PowerPC/PPCTargetTransformInfo.cpp
  lib/Target/PowerPC/PPCTargetTransformInfo.h
  test/Transforms/LoopUnroll/PowerPC/p8-unrolling-legalize-vectors.ll

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