Evan Cheng 9d339849ee Teach branch folding pass about implicit_def instructions. Unfortunately we can't just eliminate them since register scavenger expects every register use to be defined. However, we can delete them when there are no intra-block uses. Carefully removing some implicit def's which enable more blocks to be optimized away. ...

llvm-svn: 49461

2008-04-10 02:32:10 +00:00

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