LivePhysRegs: Rework constructor + documentation; NFC

- Take reference instead of pointer to a TRI that cannot be nullptr.
- Improve documentation comments.

llvm-svn: 304038

1 files changed, 4 insertions, 4 deletions

diff --git a/llvm/lib/Target/X86/X86InstrInfo.cpp b/llvm/lib/Target/X86/X86InstrInfo.cpp
index 5ac179972e5..f5bae04c6e0 100644
--- a/llvm/lib/Target/X86/X86InstrInfo.cpp
+++ b/llvm/lib/Target/X86/X86InstrInfo.cpp
@@ -5936,7 +5936,7 @@ void X86InstrInfo::replaceBranchWithTailCall(
 
   // Add implicit uses and defs of all live regs potentially clobbered by the
   // call. This way they still appear live across the call.
-  LivePhysRegs LiveRegs(&getRegisterInfo());
+  LivePhysRegs LiveRegs(getRegisterInfo());
   LiveRegs.addLiveOuts(MBB);
   SmallVector<std::pair<unsigned, const MachineOperand *>, 8> Clobbers;
   LiveRegs.stepForward(*MIB, Clobbers);
@@ -6551,9 +6551,9 @@ void X86InstrInfo::copyPhysReg(MachineBasicBlock &MBB,
     // first frame index.
     // See X86ISelLowering.cpp - X86::hasCopyImplyingStackAdjustment.
 
-    const TargetRegisterInfo *TRI = &getRegisterInfo();
+    const TargetRegisterInfo &TRI = getRegisterInfo();
     MachineBasicBlock::LivenessQueryResult LQR =
-        MBB.computeRegisterLiveness(TRI, AX, MI);
+        MBB.computeRegisterLiveness(&TRI, AX, MI);
     // We do not want to save and restore AX if we do not have to.
     // Moreover, if we do so whereas AX is dead, we would need to set
     // an undef flag on the use of AX, otherwise the verifier will
@@ -6570,7 +6570,7 @@ void X86InstrInfo::copyPhysReg(MachineBasicBlock &MBB,
       }
       // AX contains the top most register in the aliasing hierarchy.
       // It may not be live, but one of its aliases may be.
-      for (MCRegAliasIterator AI(AX, TRI, true);
+      for (MCRegAliasIterator AI(AX, &TRI, true);
            AI.isValid() && LQR != MachineBasicBlock::LQR_Live; ++AI)
         LQR = LPR.contains(*AI) ? MachineBasicBlock::LQR_Live
                                 : MachineBasicBlock::LQR_Dead;