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| author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2011-06-27 15:00:36 +0000 |
|---|---|---|
| committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2011-06-27 15:00:36 +0000 |
| commit | f27229ee5ad121247b9c79e7605b19fccf781d8d (patch) | |
| tree | e4b7f04724efab4f2ad8dd48c30b07993ce2cb28 /lib/CodeGen/DeadMachineInstructionElim.cpp | |
| parent | 9174d5c7383490d79b6a483d73cded54e32275d6 (diff) | |
| download | external_llvm-f27229ee5ad121247b9c79e7605b19fccf781d8d.zip external_llvm-f27229ee5ad121247b9c79e7605b19fccf781d8d.tar.gz external_llvm-f27229ee5ad121247b9c79e7605b19fccf781d8d.tar.bz2 | |
Track live-out physical registers in MachineDCE.
Patch by Sanjoy Das!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133910 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/DeadMachineInstructionElim.cpp')
| -rw-r--r-- | lib/CodeGen/DeadMachineInstructionElim.cpp | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/lib/CodeGen/DeadMachineInstructionElim.cpp b/lib/CodeGen/DeadMachineInstructionElim.cpp index fdc1d91..6de6c0c 100644 --- a/lib/CodeGen/DeadMachineInstructionElim.cpp +++ b/lib/CodeGen/DeadMachineInstructionElim.cpp @@ -110,9 +110,14 @@ bool DeadMachineInstructionElim::runOnMachineFunction(MachineFunction &MF) { LivePhysRegs.set(Reg); } - // FIXME: Add live-ins from sucessors to LivePhysRegs. Normally, physregs - // are not live across blocks, but some targets (x86) can have flags live - // out of a block. + // Add live-ins from sucessors to LivePhysRegs. Normally, physregs are not + // live across blocks, but some targets (x86) can have flags live out of a + // block. + for (MachineBasicBlock::succ_iterator S = MBB->succ_begin(), + E = MBB->succ_end(); S != E; S++) + for (MachineBasicBlock::livein_iterator LI = (*S)->livein_begin(); + LI != (*S)->livein_end(); LI++) + LivePhysRegs.set(*LI); // Now scan the instructions and delete dead ones, tracking physreg // liveness as we go. |