Richard Osborne 83eab939a4 [XCore] Add dag combines for instructions that ignore some input bits.
These instructions ignore the high bits of one of their input operands -
try and use this to simplify the code.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@202394 91177308-0d34-0410-b5e6-96231b3b80d8
2014-02-27 13:20:11 +00:00
..
2014-01-24 17:20:08 +00:00

To-do
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* Instruction encodings
* Tailcalls
* Investigate loop alignment
* Add builtins