Hal Finkel 4e5ca9e578 Initial implementation of PPCTargetTransformInfo ...

This provides a place to add customized operation cost information and
control some other target-specific IR-level transformations.

The only non-trivial logic in this checkin assigns a higher cost to
unaligned loads and stores (covered by the included test case).

llvm-svn: 173520

2013-01-25 23:05:59 +00:00

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