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* Rename AliasSet to SubRegs, to reflect changes in the surrounding code.Dan Gohman2008-10-161-3/+3
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57618 91177308-0d34-0410-b5e6-96231b3b80d8
* Fix a subtle bug in DeadMachineInstructionElim's livenessDan Gohman2008-10-161-1/+4
| | | | | | | | computation. A def of a register doesn't necessarily kill live super-registers. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57614 91177308-0d34-0410-b5e6-96231b3b80d8
* Switch the MachineOperand accessors back to the short names likeDan Gohman2008-10-031-3/+3
| | | | | | | isReg, etc., from isRegister, etc. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57006 91177308-0d34-0410-b5e6-96231b3b80d8
* Add debug output to this pass.Dan Gohman2008-09-251-0/+2
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56602 91177308-0d34-0410-b5e6-96231b3b80d8
* Refactor the logic for testing if an instruction is dead into aDan Gohman2008-09-241-37/+48
| | | | | | | separate method. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56531 91177308-0d34-0410-b5e6-96231b3b80d8
* Set SetStore to false, to allow this pass to deleteDan Gohman2008-09-241-1/+2
| | | | | | | dead loads. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56529 91177308-0d34-0410-b5e6-96231b3b80d8
* Now that DeadMachineInstructionElim is basically workingDan Gohman2008-09-231-6/+0
| | | | | | | | correctly, it's not necessary to explicitly remove registers from their use-def lists. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56509 91177308-0d34-0410-b5e6-96231b3b80d8
* Track local physical register liveness. This is not the mostDan Gohman2008-09-231-3/+53
| | | | | | | | efficient implementation possible, but it's pretty simple and good enough for the time being. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56504 91177308-0d34-0410-b5e6-96231b3b80d8
* Don't consider instructions with implicit physical registerDan Gohman2008-09-181-1/+2
| | | | | | | defs to be necessarily live. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56310 91177308-0d34-0410-b5e6-96231b3b80d8
* Add a new MachineInstr-level DCE pass. It is very simple, and is intended toDan Gohman2008-09-171-0/+99
be used with fast-isel. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56268 91177308-0d34-0410-b5e6-96231b3b80d8
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