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Author SHA1 Message Date
Dan Gohman 269999cb03 Track local physical register liveness. This is not the most 
efficient implementation possible, but it's pretty simple and
good enough for the time being.

llvm-svn: 56504
 2008-09-23 21:40:44 +00:00
Dan Gohman f3d647e00b Don't consider instructions with implicit physical register 
defs to be necessarily live.

llvm-svn: 56310
 2008-09-18 18:22:32 +00:00
Dan Gohman c24cd015a7 Add a new MachineInstr-level DCE pass. It is very simple, and is intended to 
be used with fast-isel.

llvm-svn: 56268
 2008-09-17 00:43:24 +00:00