llvm-project/llvm/lib/Target/X86/X86CallLowering.cpp

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1.4 KiB
C++

//===-- llvm/lib/Target/X86/X86CallLowering.cpp - Call lowering -----------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
///
/// \file
/// This file implements the lowering of LLVM calls to machine code calls for
/// GlobalISel.
///
//===----------------------------------------------------------------------===//
#include "X86CallLowering.h"
#include "X86ISelLowering.h"
#include "X86InstrInfo.h"
#include "llvm/CodeGen/GlobalISel/MachineIRBuilder.h"
using namespace llvm;
#ifndef LLVM_BUILD_GLOBAL_ISEL
#error "This shouldn't be built without GISel"
#endif
X86CallLowering::X86CallLowering(const X86TargetLowering &TLI)
: CallLowering(&TLI) {}
bool X86CallLowering::lowerReturn(MachineIRBuilder &MIRBuilder,
const Value *Val, unsigned VReg) const {
// TODO: handle functions returning non-void values.
if (Val)
return false;
MIRBuilder.buildInstr(X86::RET).addImm(0);
return true;
}
bool X86CallLowering::lowerFormalArguments(MachineIRBuilder &MIRBuilder,
const Function &F,
ArrayRef<unsigned> VRegs) const {
// TODO: handle functions with one or more arguments.
return F.arg_empty();
}