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If the return values can't be lowered to registers SelectionDAG performs the sret demotion. This patch contains the basic implementation for the same in the GlobalISel pipeline. Furthermore, targets should bring relevant changes during lowerFormalArguments, lowerReturn and lowerCall to make use of this feature. Reviewed By: arsenm Differential Revision: https://reviews.llvm.org/D92953
61 lines
2.0 KiB
C++
61 lines
2.0 KiB
C++
//===- llvm/lib/Target/ARM/ARMCallLowering.h - Call lowering ----*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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/// \file
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/// This file describes how to lower LLVM calls to machine code calls.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_ARM_ARMCALLLOWERING_H
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#define LLVM_LIB_TARGET_ARM_ARMCALLLOWERING_H
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/CodeGen/GlobalISel/CallLowering.h"
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#include "llvm/IR/CallingConv.h"
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#include <cstdint>
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#include <functional>
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namespace llvm {
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class ARMTargetLowering;
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class MachineFunction;
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class MachineInstrBuilder;
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class MachineIRBuilder;
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class Value;
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class ARMCallLowering : public CallLowering {
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public:
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ARMCallLowering(const ARMTargetLowering &TLI);
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bool lowerReturn(MachineIRBuilder &MIRBuilder, const Value *Val,
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ArrayRef<Register> VRegs,
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FunctionLoweringInfo &FLI) const override;
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bool lowerFormalArguments(MachineIRBuilder &MIRBuilder, const Function &F,
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ArrayRef<ArrayRef<Register>> VRegs,
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FunctionLoweringInfo &FLI) const override;
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bool lowerCall(MachineIRBuilder &MIRBuilder,
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CallLoweringInfo &Info) const override;
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private:
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bool lowerReturnVal(MachineIRBuilder &MIRBuilder, const Value *Val,
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ArrayRef<Register> VRegs,
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MachineInstrBuilder &Ret) const;
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/// Split an argument into one or more arguments that the CC lowering can cope
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/// with.
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void splitToValueTypes(const ArgInfo &OrigArg,
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SmallVectorImpl<ArgInfo> &SplitArgs,
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MachineFunction &MF) const;
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};
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} // end namespace llvm
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#endif // LLVM_LIB_TARGET_ARM_ARMCALLLOWERING_H
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