GlobalISel: add specialized buildCopy function to MachineInstrBuilder.

NFC.

llvm-svn: 276763

llvm/include/llvm/CodeGen/GlobalISel/MachineIRBuilder.h

@@ -183,6 +183,15 @@ public:
   /// \return The newly created instruction.
   MachineInstr *buildBr(MachineBasicBlock &BB);
 
+  /// Build and insert \p Res<def> = COPY Op
+  ///
+  /// Register-to-register COPY sets \p Res to \p Op.
+  ///
+  /// \pre setBasicBlock or setMI must have been called.
+  ///
+  /// \return The newly created instruction.
+  MachineInstr *buildCopy(unsigned Res, unsigned Op);
+
   /// Build and insert `Res0<def>, ... = G_EXTRACT Ty Src, Idx0, ...`.
   ///
   /// If \p Ty has size N bits, G_EXTRACT sets \p Res[0] to bits `[Idxs[0],

llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp

@@ -102,7 +102,7 @@ bool IRTranslator::translateBr(const Instruction &Inst) {
 
 bool IRTranslator::translateBitCast(const CastInst &CI) {
   if (LLT{*CI.getDestTy()} == LLT{*CI.getSrcTy()}) {
-    MIRBuilder.buildInstr(TargetOpcode::COPY, getOrCreateVReg(CI),
+    MIRBuilder.buildCopy(getOrCreateVReg(CI),
                          getOrCreateVReg(*CI.getOperand(0)));
     return true;
   }

llvm/lib/CodeGen/GlobalISel/MachineIRBuilder.cpp

@@ -90,6 +90,10 @@ MachineInstr *MachineIRBuilder::buildBr(MachineBasicBlock &Dest) {
   return NewMI;
 }
 
+MachineInstr *MachineIRBuilder::buildCopy(unsigned Res, unsigned Op) {
+  return buildInstr(TargetOpcode::COPY, Res, Op);
+}
+
 MachineInstr *MachineIRBuilder::buildExtract(LLT Ty, ArrayRef<unsigned> Results,
                                              unsigned Src,
                                              ArrayRef<unsigned> Indexes) {

llvm/lib/CodeGen/GlobalISel/RegBankSelect.cpp

@@ -126,7 +126,7 @@ void RegBankSelect::repairReg(
          "We are about to create several defs for Dst");
 
   // Build the instruction used to repair, then clone it at the right places.
-  MachineInstr *MI = MIRBuilder.buildInstr(TargetOpcode::COPY, Dst, Src);
+  MachineInstr *MI = MIRBuilder.buildCopy(Dst, Src);
   MI->removeFromParent();
   DEBUG(dbgs() << "Copy: " << PrintReg(Src) << " to: " << PrintReg(Dst)
                << '\n');