}
unsigned ARMFastISel::ARMMaterializeGV(const GlobalValue *GV, EVT VT) {
- // Disable currently...
- return 0;
+ // For now 32-bit only.
+ if (VT.getSimpleVT().SimpleTy != MVT::i32) return 0;
+
+ Reloc::Model RelocM = TM.getRelocationModel();
+
+ // TODO: No external globals for now.
+ if (Subtarget->GVIsIndirectSymbol(GV, RelocM)) return 0;
+
+ // TODO: Need more magic for ARM PIC.
+ if (!isThumb && (RelocM == Reloc::PIC_)) return 0;
+
+ // MachineConstantPool wants an explicit alignment.
+ unsigned Align = TD.getPrefTypeAlignment(GV->getType());
+ if (Align == 0) {
+ // TODO: Figure out if this is correct.
+ Align = TD.getTypeAllocSize(GV->getType());
+ }
+
+ // Grab index.
+ unsigned PCAdj = (RelocM != Reloc::PIC_) ? 0 : (Subtarget->isThumb() ? 4 : 8);
+ unsigned Id = AFI->createConstPoolEntryUId();
+ ARMConstantPoolValue *CPV = new ARMConstantPoolValue(GV, Id,
+ ARMCP::CPValue, PCAdj);
+ unsigned Idx = MCP.getConstantPoolIndex(CPV, Align);
+
+ // Load value.
+ MachineInstrBuilder MIB;
+ unsigned DestReg = createResultReg(TLI.getRegClassFor(VT));
+ if (isThumb) {
+ unsigned Opc = (RelocM != Reloc::PIC_) ? ARM::t2LDRpci : ARM::t2LDRpci_pic;
+ MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(Opc), DestReg)
+ .addConstantPoolIndex(Idx);
+ if (RelocM == Reloc::PIC_)
+ MIB.addImm(Id);
+ } else {
+ // The extra reg and immediate are for addrmode2.
+ MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(ARM::LDRcp),
+ DestReg)
+ .addConstantPoolIndex(Idx)
+ .addReg(0).addImm(0);
+ }
+ AddOptionalDefs(MIB);
+ return DestReg;
}
unsigned ARMFastISel::TargetMaterializeConstant(const Constant *C) {