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3 Commits

Author SHA1 Message Date
Dan Gohman
9f47de10e3 Add support for tail duplication to BranchFolding, and extend 
tail merging support to handle more cases.
 - Recognize several cases where tail merging is beneficial even when
   the tail size is smaller than the generic threshold.
 - Make use of MachineInstrDesc::isBarrier to help detect
   non-fallthrough blocks.
 - Check for and avoid disrupting fall-through edges in more cases.

llvm-svn: 86871
 2009-11-11 19:48:59 +00:00
Evan Cheng
0151329ce5 Fix tests. 
llvm-svn: 85723
 2009-11-01 18:13:29 +00:00
Evan Cheng
de16fff3e8 Use cbz and cbnz instructions. 
llvm-svn: 85698
 2009-10-31 23:46:45 +00:00