d68458bd56
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
54 lines
1.9 KiB
C++
54 lines
1.9 KiB
C++
//===-- PPCCallLowering.h - Call lowering for GlobalISel -------*- 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 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 "PPCCallLowering.h"
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#include "llvm/CodeGen/GlobalISel/MachineIRBuilder.h"
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#include "llvm/Support/Debug.h"
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#define DEBUG_TYPE "ppc-call-lowering"
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using namespace llvm;
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PPCCallLowering::PPCCallLowering(const PPCTargetLowering &TLI)
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: CallLowering(&TLI) {}
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bool PPCCallLowering::lowerReturn(MachineIRBuilder &MIRBuilder,
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const Value *Val, ArrayRef<Register> VRegs,
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FunctionLoweringInfo &FLI,
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Register SwiftErrorVReg) const {
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assert(((Val && !VRegs.empty()) || (!Val && VRegs.empty())) &&
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"Return value without a vreg");
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if (VRegs.size() > 0)
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return false;
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MIRBuilder.buildInstr(PPC::BLR8);
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return true;
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}
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bool PPCCallLowering::lowerFormalArguments(MachineIRBuilder &MIRBuilder,
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const Function &F,
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ArrayRef<ArrayRef<Register>> VRegs,
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FunctionLoweringInfo &FLI) const {
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// If VRegs is empty, then there are no formal arguments to lower and thus can
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// always return true. If there are formal arguments, we currently do not
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// handle them and thus return false.
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return VRegs.empty();
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}
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bool PPCCallLowering::lowerCall(MachineIRBuilder &MIRBuilder,
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CallLoweringInfo &Info) const {
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return false;
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}
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