[llvm] [GlobalIsel] Lower integer constants to constant pool in `LegalizerHelper`. (PR #81957)

[Mikhail Gudim via llvm-commits]

================
@@ -2987,27 +2987,47 @@ static void getUnmergePieces(SmallVectorImpl<Register> &Pieces,
     Pieces.push_back(Unmerge.getReg(I));
 }
 
-LegalizerHelper::LegalizeResult
-LegalizerHelper::lowerFConstant(MachineInstr &MI) {
-  Register Dst = MI.getOperand(0).getReg();
-
+static void emitLoadFromConstantPool(Register DstReg, const Constant *ConstVal,
+                                     MachineIRBuilder &MIRBuilder) {
+  MachineRegisterInfo &MRI = *MIRBuilder.getMRI();
   MachineFunction &MF = MIRBuilder.getMF();
   const DataLayout &DL = MIRBuilder.getDataLayout();
-
   unsigned AddrSpace = DL.getDefaultGlobalsAddressSpace();
   LLT AddrPtrTy = LLT::pointer(AddrSpace, DL.getPointerSizeInBits(AddrSpace));
-  Align Alignment = Align(DL.getABITypeAlign(
-      getFloatTypeForLLT(MF.getFunction().getContext(), MRI.getType(Dst))));
+  LLT DstLLT = MRI.getType(DstReg);
+
+  Align Alignment(DL.getABITypeAlign(ConstVal->getType()));
 
   auto Addr = MIRBuilder.buildConstantPool(
-      AddrPtrTy, MF.getConstantPool()->getConstantPoolIndex(
-                     MI.getOperand(1).getFPImm(), Alignment));
+      AddrPtrTy,
+      MF.getConstantPool()->getConstantPoolIndex(ConstVal, Alignment));
 
-  MachineMemOperand *MMO = MF.getMachineMemOperand(
-      MachinePointerInfo::getConstantPool(MF), MachineMemOperand::MOLoad,
-      MRI.getType(Dst), Alignment);
+  MachineMemOperand *MMO =
+      MF.getMachineMemOperand(MachinePointerInfo::getConstantPool(MF),
+                              MachineMemOperand::MOLoad, DstLLT, Alignment);
+
+  MIRBuilder.buildLoadInstr(TargetOpcode::G_LOAD, DstReg, Addr, *MMO);
+}
+
+LegalizerHelper::LegalizeResult
+LegalizerHelper::lowerConstant(MachineInstr &MI) {
+  MachineOperand ConstOperand = MI.getOperand(1);
----------------
mgudim wrote:

done.

https://github.com/llvm/llvm-project/pull/81957