- Remove calls to copyKillDeadInfo which is an N^2 function. Instead, propagate kill / dead markers as new instructions are constructed in foldMemoryOperand, convertToThressAddress, etc.

- Also remove LiveVariables::instructionChanged, etc. Replace all calls with cheaper calls which update VarInfo kill list.

llvm-svn: 53097

1 files changed, 11 insertions, 7 deletions

diff --git a/llvm/lib/Target/Mips/MipsInstrInfo.cpp b/llvm/lib/Target/Mips/MipsInstrInfo.cpp
index fa5d8b3bd77..c7bc1e9076b 100644
--- a/llvm/lib/Target/Mips/MipsInstrInfo.cpp
+++ b/llvm/lib/Target/Mips/MipsInstrInfo.cpp
@@ -386,18 +386,22 @@ foldMemoryOperand(MachineFunction &MF,
         (MI->getOperand(1).getReg() == Mips::ZERO) &&
         (MI->getOperand(2).isRegister())) 
       {
-        if (Ops[0] == 0)    // COPY -> STORE
+        if (Ops[0] == 0) {    // COPY -> STORE
+          unsigned SrcReg = MI->getOperand(2).getReg();
+          bool isKill = MI->getOperand(2).isKill();
           NewMI = BuildMI(get(Mips::SW)).addFrameIndex(FI)
-                  .addImm(0).addReg(MI->getOperand(2).getReg());
-        else                   // COPY -> LOAD
-          NewMI = BuildMI(get(Mips::LW), MI->getOperand(0)
-                  .getReg()).addImm(0).addFrameIndex(FI);
+            .addImm(0).addReg(SrcReg, false, false, isKill);
+        } else {              // COPY -> LOAD
+          unsigned DstReg = MI->getOperand(0).getReg();
+          bool isDead = MI->getOperand(0).isDead();
+          NewMI = BuildMI(get(Mips::LW))
+            .addReg(DstReg, true, false, false, isDead)
+            .addImm(0).addFrameIndex(FI);
+        }
       }
       break;
   }
 
-  if (NewMI)
-    NewMI->copyKillDeadInfo(MI);
   return NewMI;
 }