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3 Commits

Author SHA1 Message Date
Bob Wilson 298cdac99c Run the pre-register allocation tail duplication pass by default. Remove 
the -pre-regalloc-taildup command-line option, and add a new
-disable-early-taildup option.

llvm-svn: 93597
 2010-01-16 00:29:50 +00:00
Jakob Stoklund Olesen f1522d612f Add comments. 
llvm-svn: 92883
 2010-01-07 00:51:04 +00:00
Jakob Stoklund Olesen 29a64c9575 Add Target hook to duplicate machine instructions. 
Some instructions refer to unique labels, and so cannot be trivially cloned
with CloneMachineInstr.

llvm-svn: 92873
 2010-01-06 23:47:07 +00:00