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103 Commits

Author SHA1 Message Date
Bob Wilson
505ddaa4dc Remove isProfitableToDuplicateIndirectBranch target hook. It is profitable 
for all the processors where I have tried it, and even when it might not help
performance, the cost is quite low.  The opportunities for duplicating
indirect branches are limited by other factors so code size does not change
much due to tail duplicating indirect branches aggressively.

llvm-svn: 90144
 2009-11-30 18:35:03 +00:00
Bob Wilson
9594db5693 Rename new TailDuplicationPass to avoid name conflict with the old one. 
llvm-svn: 89968
 2009-11-26 21:38:41 +00:00
Bob Wilson
2d4ff12da9 Split tail duplication into a separate pass. This is needed to avoid 
running tail duplication when doing branch folding for if-conversion, and
we also want to be able to run tail duplication earlier to fix some
reg alloc problems.  Move the CanFallThrough function from BranchFolding
to MachineBasicBlock so that it can be shared by TailDuplication.

llvm-svn: 89904
 2009-11-26 00:32:21 +00:00