- Mark last use of a split interval as kill instead of letting spiller track it.

  This allows an important optimization to be re-enabled.
- If all uses / defs of a split interval can be folded, give the interval a
  low spill weight so it would not be picked in case spilling is needed (avoid
  pushing other intervals in the same BB to be spilled).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44601 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 0 insertions, 2 deletions

diff --git a/lib/CodeGen/VirtRegMap.cpp b/lib/CodeGen/VirtRegMap.cpp
index 6c04439bcb..050f17fe7a 100644
--- a/lib/CodeGen/VirtRegMap.cpp
+++ b/lib/CodeGen/VirtRegMap.cpp
@@ -1295,8 +1295,6 @@ void LocalSpiller::RewriteMBB(MachineBasicBlock &MBB, VirtRegMap &VRM) {
           // the value and there isn't an earlier def that has already clobbered the
           // physreg.
           if (PhysReg &&
-              Spills.canClobberPhysReg(SS) &&
-              !ReusedOperands.isClobbered(PhysReg) &&
               DeadStore->findRegisterUseOperandIdx(PhysReg, true) != -1 &&
               MRI->unfoldMemoryOperand(MF, &MI, PhysReg, false, true, NewMIs)) {
             MBB.insert(MII, NewMIs[0]);