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4 Commits

Author SHA1 Message Date
Dan Gohman 64b5d0f468 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 4ad726b4be Fix tests. 
llvm-svn: 83241
 2009-10-02 06:53:57 +00:00
Dan Gohman c8054d90fb Eliminate more uses of llvm-as and llvm-dis. 
llvm-svn: 81293
 2009-09-09 00:09:15 +00:00
Evan Cheng 3d2fce01aa Run branch folding if if-converter make some transformations. 
llvm-svn: 80994
 2009-09-04 07:47:40 +00:00