Revert "[ARM][LowOverheadLoops] Update liveness info"

This reverts commit e93e0d413f3afa1df5c5f88df546bebcd1183155.

There's some ordering problems on some on the buildbots which needs
investigating.

1 files changed, 0 insertions, 13 deletions

diff --git a/llvm/lib/CodeGen/LivePhysRegs.cpp b/llvm/lib/CodeGen/LivePhysRegs.cpp
index 547970e7ab5..7a5cffca347 100644
--- a/llvm/lib/CodeGen/LivePhysRegs.cpp
+++ b/llvm/lib/CodeGen/LivePhysRegs.cpp
@@ -276,7 +276,6 @@ void llvm::recomputeLivenessFlags(MachineBasicBlock &MBB) {
   const MachineFunction &MF = *MBB.getParent();
   const MachineRegisterInfo &MRI = MF.getRegInfo();
   const TargetRegisterInfo &TRI = *MRI.getTargetRegisterInfo();
-  const MachineFrameInfo &MFI = MF.getFrameInfo();
 
   // We walk through the block backwards and start with the live outs.
   LivePhysRegs LiveRegs;
@@ -295,18 +294,6 @@ void llvm::recomputeLivenessFlags(MachineBasicBlock &MBB) {
       assert(Register::isPhysicalRegister(Reg));
 
       bool IsNotLive = LiveRegs.available(MRI, Reg);
-
-      // Special-case return instructions for cases when a return is not
-      // the last instruction in the block.
-      if (MI.isReturn() && MFI.isCalleeSavedInfoValid()) {
-        for (const CalleeSavedInfo &Info : MFI.getCalleeSavedInfo()) {
-          if (Info.getReg() == Reg) {
-            IsNotLive = !Info.isRestored();
-            break;
-          }
-        }
-      }
-
       MO->setIsDead(IsNotLive);
     }