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f6eba3106a
Summary:
Add basic functionality to support call lowering for X86.
Currently only supports functions which return void and take zero arguments.
Inspired by commit 286573.
Reviewers: ab, qcolombet, t.p.northover
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D26593
llvm-svn: 286935
47 lines
1.4 KiB
C++
47 lines
1.4 KiB
C++
//===-- llvm/lib/Target/X86/X86CallLowering.cpp - Call lowering -----------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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///
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/// \file
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/// This file implements the lowering of LLVM calls to machine code calls for
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/// GlobalISel.
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///
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//===----------------------------------------------------------------------===//
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#include "X86CallLowering.h"
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#include "X86ISelLowering.h"
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#include "X86InstrInfo.h"
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#include "llvm/CodeGen/GlobalISel/MachineIRBuilder.h"
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using namespace llvm;
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#ifndef LLVM_BUILD_GLOBAL_ISEL
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#error "This shouldn't be built without GISel"
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#endif
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X86CallLowering::X86CallLowering(const X86TargetLowering &TLI)
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: CallLowering(&TLI) {}
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bool X86CallLowering::lowerReturn(MachineIRBuilder &MIRBuilder,
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const Value *Val, unsigned VReg) const {
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// TODO: handle functions returning non-void values.
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if (Val)
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return false;
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MIRBuilder.buildInstr(X86::RET).addImm(0);
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return true;
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}
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bool X86CallLowering::lowerFormalArguments(MachineIRBuilder &MIRBuilder,
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const Function &F,
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ArrayRef<unsigned> VRegs) const {
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// TODO: handle functions with one or more arguments.
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return F.arg_empty();
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}
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