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Author SHA1 Message Date
Hal Finkel 96c2d4d945 Add the PPCCTRLoops pass: a PPC machine-code-level optimization pass to form CTR-based loop branching code. 
This pass is derived from the Hexagon HardwareLoops pass. The only significant enhancement over the Hexagon
pass is that PPCCTRLoops will also attempt to delete the replaced add and compare operations if they are
no longer otherwise used. Also, invalid preheader DebugLoc is not used.

llvm-svn: 158204
 2012-06-08 15:38:21 +00:00