[MIPS] Expose the ZERO register as a constant physical register

The ZERO register should be exposed as a constant physical register through the interface TargetRegisterInfo::isConstantPhysReg.

Differential Revision: https://reviews.llvm.org/D130932

diff --git a/llvm/lib/Target/Mips/MipsRegisterInfo.cpp b/llvm/lib/Target/Mips/MipsRegisterInfo.cpp
index 390ab9d..6aa5610 100644 (file)
--- a/llvm/lib/Target/Mips/MipsRegisterInfo.cpp
+++ b/llvm/lib/Target/Mips/MipsRegisterInfo.cpp
@@ -318,3 +318,7 @@ bool MipsRegisterInfo::canRealignStack(const MachineFunction &MF) const {
   // sized objects.
   return MF.getRegInfo().canReserveReg(BP);
 }
+
+bool MipsRegisterInfo::isConstantPhysReg(MCRegister PhysReg) const {
+  return PhysReg == Mips::ZERO_64 || PhysReg == Mips::ZERO;
+}

diff --git a/llvm/lib/Target/Mips/MipsRegisterInfo.h b/llvm/lib/Target/Mips/MipsRegisterInfo.h
index 06f214c..1f45f6a 100644 (file)
--- a/llvm/lib/Target/Mips/MipsRegisterInfo.h
+++ b/llvm/lib/Target/Mips/MipsRegisterInfo.h
@@ -69,6 +69,8 @@ public:
   /// Debug information queries.
   Register getFrameRegister(const MachineFunction &MF) const override;
 
+  bool isConstantPhysReg(MCRegister PhysReg) const override;
+
   /// Return GPR register class.
   virtual const TargetRegisterClass *intRegClass(unsigned Size) const = 0;