LLVM 22.0.0git
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AArch64CallLowering.cpp File Reference

This file implements the lowering of LLVM calls to machine code calls for GlobalISel. More...

#include "AArch64CallLowering.h"
#include "AArch64GlobalISelUtils.h"
#include "AArch64ISelLowering.h"
#include "AArch64MachineFunctionInfo.h"
#include "AArch64RegisterInfo.h"
#include "AArch64Subtarget.h"
#include "Utils/AArch64SMEAttributes.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/Analysis/ObjCARCUtil.h"
#include "llvm/CodeGen/Analysis.h"
#include "llvm/CodeGen/CallingConvLower.h"
#include "llvm/CodeGen/FunctionLoweringInfo.h"
#include "llvm/CodeGen/GlobalISel/GenericMachineInstrs.h"
#include "llvm/CodeGen/GlobalISel/MachineIRBuilder.h"
#include "llvm/CodeGen/GlobalISel/Utils.h"
#include "llvm/CodeGen/LowLevelTypeUtils.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineMemOperand.h"
#include "llvm/CodeGen/MachineOperand.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/TargetOpcodes.h"
#include "llvm/CodeGen/TargetRegisterInfo.h"
#include "llvm/CodeGen/TargetSubtargetInfo.h"
#include "llvm/CodeGen/ValueTypes.h"
#include "llvm/CodeGenTypes/MachineValueType.h"
#include "llvm/IR/Argument.h"
#include "llvm/IR/Attributes.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/Type.h"
#include "llvm/IR/Value.h"
#include <algorithm>
#include <cassert>
#include <cstdint>

Go to the source code of this file.

Macros

#define DEBUG_TYPE   "aarch64-call-lowering"

Functions

static void applyStackPassedSmallTypeDAGHack (EVT OrigVT, MVT &ValVT, MVT &LocVT)
static LLT getStackValueStoreTypeHack (const CCValAssign &VA)
static bool doesCalleeRestoreStack (CallingConv::ID CallConv, bool TailCallOpt)
static void handleMustTailForwardedRegisters (MachineIRBuilder &MIRBuilder, CCAssignFn *AssignFn)
 Helper function to compute forwarded registers for musttail calls.
static bool canGuaranteeTCO (CallingConv::ID CC, bool GuaranteeTailCalls)
 Return true if the calling convention is one that we can guarantee TCO for.
static bool mayTailCallThisCC (CallingConv::ID CC)
 Return true if we might ever do TCO for calls with this calling convention.
static std::pair< CCAssignFn *, CCAssignFn * > getAssignFnsForCC (CallingConv::ID CC, const AArch64TargetLowering &TLI)
 Returns a pair containing the fixed CCAssignFn and the vararg CCAssignFn for CC.
static unsigned getCallOpcode (const MachineFunction &CallerF, bool IsIndirect, bool IsTailCall, std::optional< CallLowering::PtrAuthInfo > &PAI, MachineRegisterInfo &MRI)
static const uint32_t * getMaskForArgs (SmallVectorImpl< AArch64CallLowering::ArgInfo > &OutArgs, AArch64CallLowering::CallLoweringInfo &Info, const AArch64RegisterInfo &TRI, MachineFunction &MF)

Variables

cl::opt< bool > EnableSVEGISel

Detailed Description

This file implements the lowering of LLVM calls to machine code calls for GlobalISel.

Definition in file AArch64CallLowering.cpp.

Macro Definition Documentation

◆ DEBUG_TYPE

#define DEBUG_TYPE   "aarch64-call-lowering"

Definition at line 53 of file AArch64CallLowering.cpp.

Function Documentation

◆ applyStackPassedSmallTypeDAGHack()

void applyStackPassedSmallTypeDAGHack ( EVT OrigVT,
MVT & ValVT,
MVT & LocVT )
static

Definition at line 63 of file AArch64CallLowering.cpp.

◆ canGuaranteeTCO()

bool canGuaranteeTCO ( CallingConv::ID CC,
bool GuaranteeTailCalls )
static

Return true if the calling convention is one that we can guarantee TCO for.

Definition at line 830 of file AArch64CallLowering.cpp.

References llvm::CallingConv::Fast, llvm::CallingConv::SwiftTail, and llvm::CallingConv::Tail.

◆ doesCalleeRestoreStack()

bool doesCalleeRestoreStack ( CallingConv::ID CallConv,
bool TailCallOpt )
static

Definition at line 401 of file AArch64CallLowering.cpp.

References llvm::CallingConv::Fast, llvm::CallingConv::SwiftTail, and llvm::CallingConv::Tail.

Referenced by llvm::AArch64CallLowering::lowerCall(), and llvm::AArch64CallLowering::lowerFormalArguments().

◆ getAssignFnsForCC()

std::pair< CCAssignFn *, CCAssignFn * > getAssignFnsForCC ( CallingConv::ID CC,
const AArch64TargetLowering & TLI )
static

Returns a pair containing the fixed CCAssignFn and the vararg CCAssignFn for CC.

Definition at line 855 of file AArch64CallLowering.cpp.

References llvm::AArch64TargetLowering::CCAssignFnForCall().

Referenced by llvm::AMDGPUCallLowering::areCalleeOutgoingArgsTailCallable(), llvm::AMDGPUCallLowering::doCallerAndCalleePassArgsTheSameWay(), llvm::AArch64CallLowering::lowerCall(), llvm::AMDGPUCallLowering::lowerCall(), and llvm::AMDGPUCallLowering::lowerTailCall().

◆ getCallOpcode()

unsigned getCallOpcode ( const MachineFunction & CallerF,
bool IsIndirect,
bool IsTailCall,
std::optional< CallLowering::PtrAuthInfo > & PAI,
MachineRegisterInfo & MRI )
static

Definition at line 1071 of file AArch64CallLowering.cpp.

References assert(), llvm::AArch64FunctionInfo::branchProtectionPAuthLR(), llvm::AArch64FunctionInfo::branchTargetEnforcement(), llvm::getBLRCallOpcode(), llvm::MachineFunction::getInfo(), llvm::AArch64PACKey::IA, llvm::AArch64PACKey::IB, and MRI.

Referenced by llvm::AArch64CallLowering::lowerCall(), llvm::AMDGPUCallLowering::lowerCall(), llvm::ARMCallLowering::lowerCall(), and llvm::AMDGPUCallLowering::lowerTailCall().

◆ getMaskForArgs()

const uint32_t * getMaskForArgs ( SmallVectorImpl< AArch64CallLowering::ArgInfo > & OutArgs,
AArch64CallLowering::CallLoweringInfo & Info,
const AArch64RegisterInfo & TRI,
MachineFunction & MF )
static

Definition at line 1113 of file AArch64CallLowering.cpp.

References llvm::SmallVectorTemplateCommon< T, typename >::empty(), Info, and TRI.

Referenced by llvm::AArch64CallLowering::lowerCall().

◆ getStackValueStoreTypeHack()

LLT getStackValueStoreTypeHack ( const CCValAssign & VA)
static

Definition at line 78 of file AArch64CallLowering.cpp.

References llvm::CCValAssign::getLocVT(), and llvm::CCValAssign::getValVT().

◆ handleMustTailForwardedRegisters()

void handleMustTailForwardedRegisters ( MachineIRBuilder & MIRBuilder,
CCAssignFn * AssignFn )
static

Helper function to compute forwarded registers for musttail calls.

Computes the forwarded registers, sets MBB liveness, and emits COPY instructions that can be used to save + restore registers later.

Definition at line 538 of file AArch64CallLowering.cpp.

References llvm::MachineFunction::addLiveIn(), llvm::CCState::analyzeMustTailForwardedRegisters(), assert(), llvm::MachineIRBuilder::buildCopy(), F, llvm::AArch64FunctionInfo::getForwardedMustTailRegParms(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getFunction(), llvm::MachineFunction::getInfo(), llvm::MachineIRBuilder::getMBB(), llvm::MachineIRBuilder::getMF(), llvm::MachineFrameInfo::hasMustTailInVarArgFunc(), llvm::CCState::isAllocated(), MBB, llvm::SmallVectorTemplateBase< T, bool >::push_back(), and Register.

Referenced by llvm::AArch64CallLowering::lowerFormalArguments().

◆ mayTailCallThisCC()

bool mayTailCallThisCC ( CallingConv::ID CC)
static

Return true if we might ever do TCO for calls with this calling convention.

Definition at line 836 of file AArch64CallLowering.cpp.

References llvm::CallingConv::C, llvm::CallingConv::Fast, llvm::CallingConv::PreserveAll, llvm::CallingConv::PreserveMost, llvm::CallingConv::PreserveNone, llvm::CallingConv::Swift, llvm::CallingConv::SwiftTail, and llvm::CallingConv::Tail.

Variable Documentation

◆ EnableSVEGISel

cl::opt<bool> EnableSVEGISel
extern
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