[PATCH] D49076: [PowerPC] handle ISD:TRUNCATE in BitPermutationSelector

[Hiroshi Inoue via Phabricator via llvm-commits]

inouehrs created this revision.
inouehrs added reviewers: hfinkel, echristo, kbarton, nemanjai.

This is the last one in a series of patches to support better code generation for bitfield insert.
BitPermutationSelector already support ISD::ZERO_EXTEND but not TRUNCATE.
This patch add support for ISD:TRUNCATE in BitPermutationSelector.

I am going to withdraw my old patch to do special pattern patching for bitfield insert https://reviews.llvm.org/D33715 since all problematic cases I found are handled in BitPermutationSelector.


https://reviews.llvm.org/D49076

Files:
  lib/Target/PowerPC/PPCISelDAGToDAG.cpp
  test/CodeGen/PowerPC/bitfieldinsert.ll

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