[GISel] Unify multiple instances of getTypeForLLT (NFC) (#95577)

Multiple static instances of this utility function have been found in
different GlobalISel files.
Unifying them by adding an instance in utils.cpp.

Author: cdevadas

llvm/include/llvm/CodeGen/GlobalISel/Utils.h

@@ -585,5 +585,9 @@ bool isGuaranteedNotToBePoison(Register Reg, const MachineRegisterInfo &MRI,
 bool isGuaranteedNotToBeUndef(Register Reg, const MachineRegisterInfo &MRI,
                               unsigned Depth = 0);
 
+/// Get the type back from LLT. It won't be 100 percent accurate but returns an
+/// estimate of the type.
+Type *getTypeForLLT(LLT Ty, LLVMContext &C);
+
 } // End namespace llvm.
 #endif

llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp

@@ -1099,13 +1099,6 @@ void CombinerHelper::applySextInRegOfLoad(
   MI.eraseFromParent();
 }
 
-static Type *getTypeForLLT(LLT Ty, LLVMContext &C) {
-  if (Ty.isVector())
-    return FixedVectorType::get(IntegerType::get(C, Ty.getScalarSizeInBits()),
-                                Ty.getNumElements());
-  return IntegerType::get(C, Ty.getSizeInBits());
-}
-
 /// Return true if 'MI' is a load or a store that may be fold it's address
 /// operand into the load / store addressing mode.
 static bool canFoldInAddressingMode(GLoadStore *MI, const TargetLowering &TLI,

llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp

@@ -8392,8 +8392,6 @@ LegalizerHelper::lowerVectorReduction(MachineInstr &MI) {
   return UnableToLegalize;
 }
 
-static Type *getTypeForLLT(LLT Ty, LLVMContext &C);
-
 LegalizerHelper::LegalizeResult LegalizerHelper::lowerVAArg(MachineInstr &MI) {
   MachineFunction &MF = *MI.getMF();
   const DataLayout &DL = MIRBuilder.getDataLayout();
@@ -8517,13 +8515,6 @@ static bool findGISelOptimalMemOpLowering(std::vector<LLT> &MemOps,
   return true;
 }
 
-static Type *getTypeForLLT(LLT Ty, LLVMContext &C) {
-  if (Ty.isVector())
-    return FixedVectorType::get(IntegerType::get(C, Ty.getScalarSizeInBits()),
-                                Ty.getNumElements());
-  return IntegerType::get(C, Ty.getSizeInBits());
-}
-
 // Get a vectorized representation of the memset value operand, GISel edition.
 static Register getMemsetValue(Register Val, LLT Ty, MachineIRBuilder &MIB) {
   MachineRegisterInfo &MRI = *MIB.getMRI();

llvm/lib/CodeGen/GlobalISel/Utils.cpp

@@ -1906,3 +1906,10 @@ bool llvm::isGuaranteedNotToBeUndef(Register Reg,
   return ::isGuaranteedNotToBeUndefOrPoison(Reg, MRI, Depth,
                                             UndefPoisonKind::UndefOnly);
 }
+
+Type *llvm::getTypeForLLT(LLT Ty, LLVMContext &C) {
+  if (Ty.isVector())
+    return VectorType::get(IntegerType::get(C, Ty.getScalarSizeInBits()),
+                           Ty.getElementCount());
+  return IntegerType::get(C, Ty.getSizeInBits());
+}

llvm/lib/Target/RISCV/GISel/RISCVLegalizerInfo.cpp

@@ -462,13 +462,6 @@ RISCVLegalizerInfo::RISCVLegalizerInfo(const RISCVSubtarget &ST)
   getLegacyLegalizerInfo().computeTables();
 }
 
-static Type *getTypeForLLT(LLT Ty, LLVMContext &C) {
-  if (Ty.isVector())
-    return FixedVectorType::get(IntegerType::get(C, Ty.getScalarSizeInBits()),
-                                Ty.getNumElements());
-  return IntegerType::get(C, Ty.getSizeInBits());
-}
-
 bool RISCVLegalizerInfo::legalizeIntrinsic(LegalizerHelper &Helper,
                                            MachineInstr &MI) const {
   Intrinsic::ID IntrinsicID = cast<GIntrinsic>(MI).getIntrinsicID();