[PATCH] D49698: [PowerPC] Generate lxsd instead of the ld->mtvsrd sequence for vector loads

[Amy Kwan via Phabricator via llvm-commits]

amyk created this revision.
amyk added reviewers: nemanjai, echristo, hfinkel.
Herald added a subscriber: hiraditya.

This patch addresses:

- Implementation within `PPCISelLowering.cpp` to check if we should use direct load into vector instructions (such as `lxsd`/`lfd` ) when the `scalar_to_vector` function is used; which will allow us to catch as many cases of the scalar_to_vector uses as possible to translate the ld->mtvsrd sequence into lxsd.
- Test cases to exhibit the behaviour of emitting `lxsd`/`lfd`.


https://reviews.llvm.org/D49698

Files:
  llvm/lib/Target/PowerPC/PPCISelLowering.cpp
  llvm/test/CodeGen/PowerPC/pre-inc-disable.ll

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