contrib/llvm/lib/Target/X86/X86CallLowering.cpp

   1 //===-- llvm/lib/Target/X86/X86CallLowering.cpp - Call lowering -----------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 ///
  10 /// \file
  11 /// This file implements the lowering of LLVM calls to machine code calls for
  12 /// GlobalISel.
  13 ///
  14 //===----------------------------------------------------------------------===//
  15
  16 #include "X86CallLowering.h"
  17 #include "X86ISelLowering.h"
  18 #include "X86InstrInfo.h"
  19 #include "llvm/CodeGen/GlobalISel/MachineIRBuilder.h"
  20
  21 using namespace llvm;
  22
  23 #ifndef LLVM_BUILD_GLOBAL_ISEL
  24 #error "This shouldn't be built without GISel"
  25 #endif
  26
  27 X86CallLowering::X86CallLowering(const X86TargetLowering &TLI)
  28     : CallLowering(&TLI) {}
  29
  30 bool X86CallLowering::lowerReturn(MachineIRBuilder &MIRBuilder,
  31                                   const Value *Val, unsigned VReg) const {
  32   // TODO: handle functions returning non-void values.
  33   if (Val)
  34     return false;
  35
  36   MIRBuilder.buildInstr(X86::RET).addImm(0);
  37
  38   return true;
  39 }
  40
  41 bool X86CallLowering::lowerFormalArguments(MachineIRBuilder &MIRBuilder,
  42                                            const Function &F,
  43                                            ArrayRef<unsigned> VRegs) const {
  44   // TODO: handle functions with one or more arguments.
  45   return F.arg_empty();
  46 }