LLVM: llvm::MachineRegisterInfo Class Reference (original) (raw)

MachineRegisterInfo - Keep track of information for virtual and physical registers, including vreg register classes, use/def chains for registers, etc. More...

#include "[llvm/CodeGen/MachineRegisterInfo.h](MachineRegisterInfo%5F8h%5Fsource.html)"

MachineRegisterInfo - Keep track of information for virtual and physical registers, including vreg register classes, use/def chains for registers, etc.

Definition at line 53 of file MachineRegisterInfo.h.

◆ def_bundle_iterator

Initial value:

defusechain_iterator - This class provides iterator support for machine operands in the function that...

def_bundle_iterator/def_bundle_begin/def_bundle_end - Walk all defs of the specified register, stepping by bundle.

Definition at line 415 of file MachineRegisterInfo.h.

◆ def_instr_iterator

Initial value:

def_instr_iterator/def_instr_begin/def_instr_end - Walk all defs of the specified register, stepping by MachineInst.

Definition at line 399 of file MachineRegisterInfo.h.

◆ def_iterator

def_iterator/def_begin/def_end - Walk all defs of the specified register.

Definition at line 387 of file MachineRegisterInfo.h.

◆ livein_iterator

◆ reg_bundle_iterator

Initial value:

reg_bundle_iterator/reg_bundle_begin/reg_bundle_end - Walk all defs and uses of the specified register, stepping by bundle.

Definition at line 313 of file MachineRegisterInfo.h.

◆ reg_bundle_nodbg_iterator

Initial value:

reg_bundle_nodbg_iterator/reg_bundle_nodbg_begin/reg_bundle_nodbg_end - Walk all defs and uses of the specified register, stepping by bundle, skipping those marked as Debug.

Definition at line 366 of file MachineRegisterInfo.h.

◆ reg_instr_iterator

Initial value:

reg_instr_iterator/reg_instr_begin/reg_instr_end - Walk all defs and uses of the specified register, stepping by MachineInstr.

Definition at line 297 of file MachineRegisterInfo.h.

◆ reg_instr_nodbg_iterator

Initial value:

reg_instr_nodbg_iterator/reg_instr_nodbg_begin/reg_instr_nodbg_end - Walk all defs and uses of the specified register, stepping by MachineInstr, skipping those marked as Debug.

Definition at line 349 of file MachineRegisterInfo.h.

◆ reg_iterator

reg_iterator/reg_begin/reg_end - Walk all defs and uses of the specified register.

Definition at line 285 of file MachineRegisterInfo.h.

◆ reg_nodbg_iterator

Initial value:

reg_begin/reg_end - Provide iteration support to walk over all definitions and uses of a register wit...

reg_nodbg_iterator/reg_nodbg_begin/reg_nodbg_end - Walk all defs and uses of the specified register, skipping those marked as Debug.

Definition at line 332 of file MachineRegisterInfo.h.

◆ use_bundle_iterator

Initial value:

use_bundle_iterator/use_bundle_begin/use_bundle_end - Walk all uses of the specified register, stepping by bundle.

Definition at line 494 of file MachineRegisterInfo.h.

◆ use_bundle_nodbg_iterator

Initial value:

use_bundle_nodbg_iterator/use_bundle_nodbg_begin/use_bundle_nodbg_end - Walk all uses of the specified register, stepping by bundle, skipping those marked as Debug.

Definition at line 553 of file MachineRegisterInfo.h.

◆ use_instr_iterator

Initial value:

use_instr_iterator/use_instr_begin/use_instr_end - Walk all uses of the specified register, stepping by MachineInstr.

Definition at line 478 of file MachineRegisterInfo.h.

◆ use_instr_nodbg_iterator

Initial value:

use_instr_nodbg_iterator/use_instr_nodbg_begin/use_instr_nodbg_end - Walk all uses of the specified register, stepping by MachineInstr, skipping those marked as Debug.

Definition at line 536 of file MachineRegisterInfo.h.

◆ use_iterator

use_iterator/use_begin/use_end - Walk all uses of the specified register.

Definition at line 466 of file MachineRegisterInfo.h.

◆ use_nodbg_iterator

Initial value:

use_nodbg_iterator/use_nodbg_begin/use_nodbg_end - Walk all uses of the specified register, skipping those marked as Debug.

Definition at line 519 of file MachineRegisterInfo.h.

◆ MachineRegisterInfo() [2/2]

◆ addDelegate()

◆ addLiveIn()

◆ addPhysRegsUsedFromRegMask()

addPhysRegsUsedFromRegMask - Mark any registers not in RegMask as used.

This corresponds to the bit mask attached to register mask operands.

Definition at line 913 of file MachineRegisterInfo.h.

◆ addRegAllocationHint()

◆ addRegOperandToUseList()

◆ canReserveReg()

◆ clearKillFlags()

◆ clearSimpleHint()

◆ clearVirtRegs()

◆ clearVirtRegTypes()

Remove all types associated to virtual registers (after instruction selection and constraining of all generic virtual registers).

Definition at line 201 of file MachineRegisterInfo.cpp.

◆ cloneVirtualRegister()

◆ constrainRegAttrs()

Constrain the register class or the register bank of the virtual register Reg (and low-level type) to be a common subclass or a common bank of both registers provided respectively (and a common low-level type).

Do nothing if any of the attributes (classes, banks, or low-level types) of the registers are deemed incompatible, or if the resulting register will have a class smaller than before and of size less than MinNumRegs. Return true if such register attributes exist, false otherwise.

Note

Use this method instead of constrainRegClass and RegisterBankInfo::constrainGenericRegister everywhere but SelectionDAG ISel / FastISel and GlobalISel's InstructionSelect pass respectively.

Definition at line 90 of file MachineRegisterInfo.cpp.

References llvm::cast(), constrainRegClass(), getRegClassOrRegBank(), getType(), llvm::isa(), llvm::LLT::isValid(), setRegClassOrRegBank(), and setType().

◆ constrainRegClass()

constrainRegClass - Constrain the register class of the specified virtual register to be a common subclass of RC and the current register class, but only if the new class has at least MinNumRegs registers.

Return the new register class, or NULL if no such class exists. This should only be used when the constraint is known to be trivial, like GR32 -> GR32_NOSP. Beware of increasing register pressure.

Note

Assumes that the register has a register class assigned. Use RegisterBankInfo::constrainGenericRegister in GlobalISel's InstructionSelect pass and constrainRegAttrs in every other pass, including non-select passes of GlobalISel, instead.

Definition at line 84 of file MachineRegisterInfo.cpp.

References getRegClass().

Referenced by llvm::X86InstrInfo::classifyLEAReg(), constrainRegAttrs(), llvm::X86InstrInfo::convertToThreeAddress(), llvm::AArch64InstrInfo::foldMemoryOperandImpl(), llvm::AArch64InstrInfo::loadRegFromStackSlot(), and llvm::AArch64InstrInfo::storeRegToStackSlot().

◆ createGenericVirtualRegister()

◆ createIncompleteVirtualRegister()

◆ createVirtualRegister() [1/2]

createVirtualRegister - Create and return a new virtual register in the function with the specified register class.

Definition at line 154 of file MachineRegisterInfo.cpp.

References assert(), createIncompleteVirtualRegister(), llvm::TargetRegisterClass::isAllocatable(), and noteNewVirtualRegister().

Referenced by addLiveIn(), llvm::SPIRVGlobalRegistry::buildConstantSampler(), llvm::X86InstrInfo::classifyLEAReg(), llvm::AArch64FrameLowering::eliminateCallFramePseudoInstr(), llvm::AArch64RegisterInfo::eliminateFrameIndex(), llvm::ARMBaseRegisterInfo::eliminateFrameIndex(), llvm::PPCRegisterInfo::eliminateFrameIndex(), llvm::SystemZRegisterInfo::eliminateFrameIndex(), llvm::ThumbRegisterInfo::eliminateFrameIndex(), llvm::RISCVTargetLowering::emitDynamicProbedAlloc(), llvm::X86TargetLowering::EmitInstrWithCustomInserter(), llvm::CSKYFrameLowering::emitPrologue(), llvm::MipsSEFrameLowering::emitPrologue(), llvm::RISCVFrameLowering::emitPrologue(), llvm::MSP430TargetLowering::EmitShiftInstr(), emitThumbRegPlusImmInReg(), llvm::MipsFunctionInfo::getGlobalBaseReg(), llvm::SPIRVGlobalRegistry::getOrCreateGlobalVariableWithBinding(), llvm::SPIRVCallLowering::lowerCall(), LowerCallResults(), llvm::PPCRegisterInfo::lowerCRBitRestore(), llvm::PPCRegisterInfo::lowerCRBitSpilling(), llvm::PPCRegisterInfo::lowerCRRestore(), llvm::PPCRegisterInfo::lowerCRSpilling(), llvm::PPCRegisterInfo::lowerDMRRestore(), llvm::PPCRegisterInfo::lowerDMRSpilling(), llvm::PPCRegisterInfo::lowerDynamicAlloc(), llvm::SparcTargetLowering::LowerFormalArguments_32(), llvm::PPCRegisterInfo::lowerWACCRestore(), llvm::PPCRegisterInfo::lowerWACCSpilling(), llvm::RISCVRegisterInfo::materializeFrameBaseRegister(), llvm::PPCRegisterInfo::prepareDynamicAlloca(), and llvm::ThumbRegisterInfo::rewriteFrameIndex().

◆ createVirtualRegister() [2/2]

◆ def_begin()

◆ def_bundle_begin()

◆ def_bundle_end()

◆ def_bundles()

◆ def_empty()

◆ def_end()

◆ def_instr_begin()

◆ def_instr_end()

◆ def_instructions()

◆ def_operands()

◆ disableCalleeSavedRegister()

◆ dumpUses()

◆ EmitLiveInCopies()

◆ freezeReservedRegs()

◆ getCalleeSavedRegs()

Returns list of callee saved registers.

The function returns the updated CSR list (after taking into account registers that are disabled from the CSR list).

Definition at line 643 of file MachineRegisterInfo.cpp.

References llvm::TargetRegisterInfo::getCalleeSavedRegs(), getTargetRegisterInfo(), and I.

Referenced by llvm::AArch64FrameLowering::determineCalleeSaves(), llvm::CSKYFrameLowering::determineCalleeSaves(), llvm::TargetFrameLowering::determineCalleeSaves(), llvm::SIFrameLowering::determinePrologEpilogSGPRSaves(), llvm::VETargetLowering::emitSjLjDispatchBlock(), getLiveRegsForEntryMBB(), isACalleeSavedRegister(), llvm::X86MachineFunctionInfo::setRestoreBasePointer(), and llvm::SIMachineFunctionInfo::splitWWMSpillRegisters().

◆ getLiveInPhysReg()

getLiveInPhysReg - If VReg is a live-in virtual register, return the corresponding live-in physical register.

Definition at line 467 of file MachineRegisterInfo.cpp.

References liveins().

◆ getLiveInVirtReg()

getLiveInVirtReg - If PReg is a live-in physical register, return the corresponding live-in virtual register.

getLiveInVirtReg - If PReg is a live-in physical register, return the corresponding live-in physical register.

Definition at line 476 of file MachineRegisterInfo.cpp.

References liveins(), and Register.

◆ getMaxLaneMaskForVReg()

◆ getMF()

◆ getNumVirtRegs()

◆ getOneDef()

◆ getOneNonDBGUse()

◆ getOneNonDBGUser()

◆ getPressureSets()

Get an iterator over the pressure sets affected by the virtual register or register unit.

Definition at line 1281 of file MachineRegisterInfo.h.

◆ getRegAllocationHint()

◆ getRegAllocationHints()

◆ getRegBank()

◆ getRegBankOrNull()

◆ getRegClass()

Return the register class of the specified virtual register.

This shouldn't be used directly unless Reg has a register class.

See also

getRegClassOrNull when this might happen.

Definition at line 648 of file MachineRegisterInfo.h.

References assert(), llvm::cast(), llvm::isa(), and Reg.

Referenced by constrainRegClass(), llvm::AllocationOrder::create(), llvm::SystemZInstrInfo::foldMemoryOperandImpl(), foldPatchpoint(), GetCostForDef(), getMaxLaneMaskForVReg(), getRegTy(), isNonFoldablePartialRegisterLoad(), and recomputeRegClass().

◆ getRegClassOrNull()

Return the register class of Reg, or null if Reg has not been assigned a register class yet.

Note

A null register class can only happen when these two conditions are met:

1. Generic virtual registers are created.
2. The machine function has not completely been through the instruction selection process. None of this condition is possible without GlobalISel for now. In other words, if GlobalISel is not used or if the query happens after the select pass, using getRegClass is safe.

Definition at line 665 of file MachineRegisterInfo.h.

References llvm::dyn_cast_if_present(), and Reg.

Referenced by getRegClass(), and shouldTrackSubRegLiveness().

◆ getRegClassOrRegBank()

◆ getReservedRegs()

◆ getSimpleHint()

◆ getTargetRegisterInfo()

Definition at line 159 of file MachineRegisterInfo.h.

Referenced by clearVirtRegs(), disableCalleeSavedRegister(), freezeReservedRegs(), getCalleeSavedRegs(), isAllocatable(), isConstantPhysReg(), isPhysRegModified(), isPhysRegUsed(), isReservedRegUnit(), MachineRegisterInfo(), recomputeRegClass(), replaceRegWith(), llvm::tryFoldSPUpdateIntoPushPop(), updateDbgUsersToReg(), verifyUseList(), and verifyUseLists().

◆ getType()

◆ getUniqueVRegDef()

◆ getUsedPhysRegsMask()

◆ getVRegAttrs()

◆ getVRegDef()

◆ getVRegName()

◆ hasAtMostUserInstrs()

◆ hasOneDef()

◆ hasOneNonDBGUse()

◆ hasOneNonDBGUser()

◆ hasOneUse()

◆ insertVRegByName()

◆ invalidateLiveness()

invalidateLiveness - Indicates that register liveness is no longer being tracked accurately.

This should be called by late passes that invalidate the liveness information.

Definition at line 218 of file MachineRegisterInfo.h.

◆ isAllocatable()

◆ isConstantPhysReg()

◆ isLiveIn()

◆ isPhysRegModified()

◆ isPhysRegUsed()

◆ isReserved()

◆ isReservedRegUnit()

◆ isSSA()

◆ isUpdatedCSRsInitialized()

Returns true if the updated CSR list was initialized and false otherwise.

Definition at line 239 of file MachineRegisterInfo.h.

◆ leaveSSA()

◆ livein_begin()

◆ livein_empty()

◆ livein_end()

◆ liveins()

◆ markUsesInDebugValueAsUndef()

◆ moveOperands()

◆ noteCloneVirtualRegister()

◆ noteNewVirtualRegister()

◆ operator=()

◆ recomputeRegClass()

◆ reg_begin()

◆ reg_bundle_begin()

◆ reg_bundle_end()

◆ reg_bundle_nodbg_begin()

◆ reg_bundle_nodbg_end()

◆ reg_bundles()

◆ reg_empty()

◆ reg_end()

◆ reg_instr_begin()

◆ reg_instr_end()

◆ reg_instr_nodbg_begin()

◆ reg_instr_nodbg_end()

◆ reg_instructions()

◆ reg_nodbg_begin()

◆ reg_nodbg_bundles()

◆ reg_nodbg_empty()

◆ reg_nodbg_end()

◆ reg_nodbg_instructions()

◆ reg_nodbg_operands()

◆ reg_operands()

◆ removeRegOperandFromUseList()

◆ replaceRegWith()

replaceRegWith - Replace all instances of FromReg with ToReg in the machine function.

This is like llvm-level X->replaceAllUsesWith(Y), except that it also changes any definitions of the register as well.

Note that it is usually necessary to first constrain ToReg's register class and register bank to match the FromReg constraints using one of the methods:

constrainRegClass(ToReg, getRegClass(FromReg)) constrainRegAttrs(ToReg, FromReg) RegisterBankInfo::constrainGenericRegister(ToReg, *MRI.getRegClass(FromReg), MRI)

These functions will return a falsy result if the virtual registers have incompatible constraints.

Note that if ToReg is a physical register the function will replace and apply sub registers to ToReg in order to obtain a final/proper physical register.

This is like llvm-level X->replaceAllUsesWith(Y), except that it also changes any definitions of the register as well. If ToReg is a physical register we apply the sub register to obtain the final/proper physical register.

Definition at line 386 of file MachineRegisterInfo.cpp.

References assert(), getTargetRegisterInfo(), llvm::Register::isPhysical(), llvm::make_early_inc_range(), reg_operands(), and TRI.

◆ reservedRegsFrozen()

◆ reserveReg()

reserveReg – Mark a register as reserved so checks like isAllocatable will not suggest using it.

This should not be used during the middle of a function walk, or when liveness info is available.

Definition at line 938 of file MachineRegisterInfo.h.

References assert(), reservedRegsFrozen(), and TRI.

◆ resetDelegate()

◆ setCalleeSavedRegs()

◆ setRegAllocationHint()

◆ setRegBank()

◆ setRegClass()

◆ setRegClassOrRegBank()

◆ setSimpleHint()

◆ setType()

◆ shouldTrackSubRegLiveness() [1/2]

◆ shouldTrackSubRegLiveness() [2/2]

◆ subRegLivenessEnabled()

◆ tracksLiveness()

◆ updateDbgUsersToReg()

◆ use_begin()

◆ use_bundle_begin()

◆ use_bundle_end()

◆ use_bundle_nodbg_begin()

◆ use_bundle_nodbg_end()

◆ use_bundles()

◆ use_empty()

◆ use_end()

◆ use_instr_begin()

◆ use_instr_end()

◆ use_instr_nodbg_begin()

◆ use_instr_nodbg_end()

◆ use_instructions()

◆ use_nodbg_begin()

◆ use_nodbg_bundles()

◆ use_nodbg_empty()

◆ use_nodbg_end()

◆ use_nodbg_instructions()

◆ use_nodbg_operands()

◆ use_operands()

◆ verifyUseList()

Verify the sanity of the use list for Reg.

Definition at line 223 of file MachineRegisterInfo.cpp.

References AbstractManglingParser< Derived, Alloc >::NumOps, assert(), llvm::errs(), llvm::MachineOperand::getParent(), llvm::MachineOperand::getReg(), getTargetRegisterInfo(), llvm::MachineOperand::isReg(), MI, llvm::printReg(), and reg_operands().

Referenced by clearVirtRegs(), and verifyUseLists().

◆ verifyUseLists()

◆ defusechain_instr_iterator

◆ defusechain_iterator

The documentation for this class was generated from the following files:

• include/llvm/CodeGen/MachineRegisterInfo.h
• lib/CodeGen/MachineRegisterInfo.cpp