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llvm-project/llvm/lib/Target/ARM/ARMISelLowering.h
Matt Arsenault ae56b6712d RuntimeLibcalls: Add entries for stackprotector globals 
Add entries for_stack_chk_guard, __ssp_canary_word, __security_cookie,
and __guard_local. As far as I can tell these are all just different
names for the same shaped functionality on different systems.

These aren't really functions, but special global variable names. They
should probably be treated the same way; all the same contexts that
need to know about emittable function names also need to know about
this. This avoids a special case check in IRSymtab.

This isn't a complete change, there's a lot more cleanup which
should be done. The stack protector configuration system is a
complete mess. There are multiple overlapping controls, used in
3 different places. Some of the target control implementations overlap
with conditions used in the emission points, and some use correlated
but not identical conditions in different contexts.

i.e. useLoadStackGuardNode, getIRStackGuard, getSSPStackGuardCheck and
insertSSPDeclarations are all used in inconsistent ways so I don't know
if I've tracked the intention of the system correctly.

The PowerPC test change is a bug fix on linux. Previously the manual
conditions were based around !isOSOpenBSD, which is not the condition
where __stack_chk_guard are used. Now getSDagStackGuard returns the
proper global reference, resulting in LOAD_STACK_GUARD getting a
MachineMemOperand which allows scheduling.
2025-08-22 20:18:30 +09:00

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//===- ARMISelLowering.h - ARM DAG Lowering Interface -----------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file defines the interfaces that ARM uses to lower LLVM code into a
// selection DAG.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_TARGET_ARM_ARMISELLOWERING_H
#define LLVM_LIB_TARGET_ARM_ARMISELLOWERING_H
#include "MCTargetDesc/ARMBaseInfo.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/CodeGen/CallingConvLower.h"
#include "llvm/CodeGen/ISDOpcodes.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/SelectionDAGNodes.h"
#include "llvm/CodeGen/TargetLowering.h"
#include "llvm/CodeGen/ValueTypes.h"
#include "llvm/CodeGenTypes/MachineValueType.h"
#include "llvm/IR/Attributes.h"
#include "llvm/IR/CallingConv.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/InlineAsm.h"
#include "llvm/Support/CodeGen.h"
#include <optional>
#include <utility>
namespace llvm {
class ARMBaseTargetMachine;
class ARMSubtarget;
class DataLayout;
class FastISel;
class FunctionLoweringInfo;
class GlobalValue;
class InstrItineraryData;
class Instruction;
class IRBuilderBase;
class MachineBasicBlock;
class MachineInstr;
class SelectionDAG;
class TargetLibraryInfo;
class TargetMachine;
class TargetRegisterInfo;
class VectorType;
namespace ARMISD {
// ARM Specific DAG Nodes
enum NodeType : unsigned {
// Start the numbering where the builtin ops and target ops leave off.
FIRST_NUMBER = ISD::BUILTIN_OP_END,
Wrapper, // Wrapper - A wrapper node for TargetConstantPool,
// TargetExternalSymbol, and TargetGlobalAddress.
WrapperPIC, // WrapperPIC - A wrapper node for TargetGlobalAddress in
// PIC mode.
WrapperJT, // WrapperJT - A wrapper node for TargetJumpTable
// Add pseudo op to model memcpy for struct byval.
COPY_STRUCT_BYVAL,
CALL, // Function call.
CALL_PRED, // Function call that's predicable.
CALL_NOLINK, // Function call with branch not branch-and-link.
tSECALL, // CMSE non-secure function call.
t2CALL_BTI, // Thumb function call followed by BTI instruction.
BRCOND, // Conditional branch.
BR_JT, // Jumptable branch.
BR2_JT, // Jumptable branch (2 level - jumptable entry is a jump).
RET_GLUE, // Return with a flag operand.
SERET_GLUE, // CMSE Entry function return with a flag operand.
INTRET_GLUE, // Interrupt return with an LR-offset and a flag operand.
PIC_ADD, // Add with a PC operand and a PIC label.
ASRL, // MVE long arithmetic shift right.
LSRL, // MVE long shift right.
LSLL, // MVE long shift left.
CMP, // ARM compare instructions.
CMN, // ARM CMN instructions.
CMPZ, // ARM compare that sets only Z flag.
CMPFP, // ARM VFP compare instruction, sets FPSCR.
CMPFPE, // ARM VFP signalling compare instruction, sets FPSCR.
CMPFPw0, // ARM VFP compare against zero instruction, sets FPSCR.
CMPFPEw0, // ARM VFP signalling compare against zero instruction, sets
// FPSCR.
FMSTAT, // ARM fmstat instruction.
CMOV, // ARM conditional move instructions.
SSAT, // Signed saturation
USAT, // Unsigned saturation
BCC_i64,
LSLS, // Flag-setting shift left.
LSRS1, // Flag-setting logical shift right by one bit.
ASRS1, // Flag-setting arithmetic shift right by one bit.
RRX, // Shift right one bit with carry in.
ADDC, // Add with carry
ADDE, // Add using carry
SUBC, // Sub with carry
SUBE, // Sub using carry
VMOVRRD, // double to two gprs.
VMOVDRR, // Two gprs to double.
VMOVSR, // move gpr to single, used for f32 literal constructed in a gpr
EH_SJLJ_SETJMP, // SjLj exception handling setjmp.
EH_SJLJ_LONGJMP, // SjLj exception handling longjmp.
EH_SJLJ_SETUP_DISPATCH, // SjLj exception handling setup_dispatch.
TC_RETURN, // Tail call return pseudo.
THREAD_POINTER,
DYN_ALLOC, // Dynamic allocation on the stack.
MEMBARRIER_MCR, // Memory barrier (MCR)
PRELOAD, // Preload
WIN__CHKSTK, // Windows' __chkstk call to do stack probing.
WIN__DBZCHK, // Windows' divide by zero check
WLS, // Low-overhead loops, While Loop Start branch. See t2WhileLoopStart
WLSSETUP, // Setup for the iteration count of a WLS. See t2WhileLoopSetup.
LOOP_DEC, // Really a part of LE, performs the sub
LE, // Low-overhead loops, Loop End
PREDICATE_CAST, // Predicate cast for MVE i1 types
VECTOR_REG_CAST, // Reinterpret the current contents of a vector register
MVESEXT, // Legalization aids for extending a vector into two/four vectors.
MVEZEXT, // or truncating two/four vectors into one. Eventually becomes
MVETRUNC, // stack store/load sequence, if not optimized to anything else.
VCMP, // Vector compare.
VCMPZ, // Vector compare to zero.
VTST, // Vector test bits.
// Vector shift by vector
VSHLs, // ...left/right by signed
VSHLu, // ...left/right by unsigned
// Vector shift by immediate:
VSHLIMM, // ...left
VSHRsIMM, // ...right (signed)
VSHRuIMM, // ...right (unsigned)
// Vector rounding shift by immediate:
VRSHRsIMM, // ...right (signed)
VRSHRuIMM, // ...right (unsigned)
VRSHRNIMM, // ...right narrow
// Vector saturating shift by immediate:
VQSHLsIMM, // ...left (signed)
VQSHLuIMM, // ...left (unsigned)
VQSHLsuIMM, // ...left (signed to unsigned)
VQSHRNsIMM, // ...right narrow (signed)
VQSHRNuIMM, // ...right narrow (unsigned)
VQSHRNsuIMM, // ...right narrow (signed to unsigned)
// Vector saturating rounding shift by immediate:
VQRSHRNsIMM, // ...right narrow (signed)
VQRSHRNuIMM, // ...right narrow (unsigned)
VQRSHRNsuIMM, // ...right narrow (signed to unsigned)
// Vector shift and insert:
VSLIIMM, // ...left
VSRIIMM, // ...right
// Vector get lane (VMOV scalar to ARM core register)
// (These are used for 8- and 16-bit element types only.)
VGETLANEu, // zero-extend vector extract element
VGETLANEs, // sign-extend vector extract element
// Vector move immediate and move negated immediate:
VMOVIMM,
VMVNIMM,
// Vector move f32 immediate:
VMOVFPIMM,
// Move H <-> R, clearing top 16 bits
VMOVrh,
VMOVhr,
// Vector duplicate:
VDUP,
VDUPLANE,
// Vector shuffles:
VEXT, // extract
VREV64, // reverse elements within 64-bit doublewords
VREV32, // reverse elements within 32-bit words
VREV16, // reverse elements within 16-bit halfwords
VZIP, // zip (interleave)
VUZP, // unzip (deinterleave)
VTRN, // transpose
VTBL1, // 1-register shuffle with mask
VTBL2, // 2-register shuffle with mask
VMOVN, // MVE vmovn
// MVE Saturating truncates
VQMOVNs, // Vector (V) Saturating (Q) Move and Narrow (N), signed (s)
VQMOVNu, // Vector (V) Saturating (Q) Move and Narrow (N), unsigned (u)
// MVE float <> half converts
VCVTN, // MVE vcvt f32 -> f16, truncating into either the bottom or top
// lanes
VCVTL, // MVE vcvt f16 -> f32, extending from either the bottom or top lanes
// MVE VIDUP instruction, taking a start value and increment.
VIDUP,
// Vector multiply long:
VMULLs, // ...signed
VMULLu, // ...unsigned
VQDMULH, // MVE vqdmulh instruction
// MVE reductions
VADDVs, // sign- or zero-extend the elements of a vector to i32,
VADDVu, // add them all together, and return an i32 of their sum
VADDVps, // Same as VADDV[su] but with a v4i1 predicate mask
VADDVpu,
VADDLVs, // sign- or zero-extend elements to i64 and sum, returning
VADDLVu, // the low and high 32-bit halves of the sum
VADDLVAs, // Same as VADDLV[su] but also add an input accumulator
VADDLVAu, // provided as low and high halves
VADDLVps, // Same as VADDLV[su] but with a v4i1 predicate mask
VADDLVpu,
VADDLVAps, // Same as VADDLVp[su] but with a v4i1 predicate mask
VADDLVApu,
VMLAVs, // sign- or zero-extend the elements of two vectors to i32, multiply
VMLAVu, // them and add the results together, returning an i32 of the sum
VMLAVps, // Same as VMLAV[su] with a v4i1 predicate mask
VMLAVpu,
VMLALVs, // Same as VMLAV but with i64, returning the low and
VMLALVu, // high 32-bit halves of the sum
VMLALVps, // Same as VMLALV[su] with a v4i1 predicate mask
VMLALVpu,
VMLALVAs, // Same as VMLALV but also add an input accumulator
VMLALVAu, // provided as low and high halves
VMLALVAps, // Same as VMLALVA[su] with a v4i1 predicate mask
VMLALVApu,
VMINVu, // Find minimum unsigned value of a vector and register
VMINVs, // Find minimum signed value of a vector and register
VMAXVu, // Find maximum unsigned value of a vector and register
VMAXVs, // Find maximum signed value of a vector and register
SMULWB, // Signed multiply word by half word, bottom
SMULWT, // Signed multiply word by half word, top
UMLAL, // 64bit Unsigned Accumulate Multiply
SMLAL, // 64bit Signed Accumulate Multiply
UMAAL, // 64-bit Unsigned Accumulate Accumulate Multiply
SMLALBB, // 64-bit signed accumulate multiply bottom, bottom 16
SMLALBT, // 64-bit signed accumulate multiply bottom, top 16
SMLALTB, // 64-bit signed accumulate multiply top, bottom 16
SMLALTT, // 64-bit signed accumulate multiply top, top 16
SMLALD, // Signed multiply accumulate long dual
SMLALDX, // Signed multiply accumulate long dual exchange
SMLSLD, // Signed multiply subtract long dual
SMLSLDX, // Signed multiply subtract long dual exchange
SMMLAR, // Signed multiply long, round and add
SMMLSR, // Signed multiply long, subtract and round
// Single Lane QADD8 and QADD16. Only the bottom lane. That's what the b
// stands for.
QADD8b,
QSUB8b,
QADD16b,
QSUB16b,
UQADD8b,
UQSUB8b,
UQADD16b,
UQSUB16b,
// Operands of the standard BUILD_VECTOR node are not legalized, which
// is fine if BUILD_VECTORs are always lowered to shuffles or other
// operations, but for ARM some BUILD_VECTORs are legal as-is and their
// operands need to be legalized. Define an ARM-specific version of
// BUILD_VECTOR for this purpose.
BUILD_VECTOR,
// Bit-field insert
BFI,
// Vector OR with immediate
VORRIMM,
// Vector AND with NOT of immediate
VBICIMM,
// Pseudo vector bitwise select
VBSP,
// Pseudo-instruction representing a memory copy using ldm/stm
// instructions.
MEMCPY,
// Pseudo-instruction representing a memory copy using a tail predicated
// loop
MEMCPYLOOP,
// Pseudo-instruction representing a memset using a tail predicated
// loop
MEMSETLOOP,
// V8.1MMainline condition select
CSINV, // Conditional select invert.
CSNEG, // Conditional select negate.
CSINC, // Conditional select increment.
// Vector load N-element structure to all lanes:
FIRST_MEMORY_OPCODE,
VLD1DUP = FIRST_MEMORY_OPCODE,
VLD2DUP,
VLD3DUP,
VLD4DUP,
// NEON loads with post-increment base updates:
VLD1_UPD,
VLD2_UPD,
VLD3_UPD,
VLD4_UPD,
VLD2LN_UPD,
VLD3LN_UPD,
VLD4LN_UPD,
VLD1DUP_UPD,
VLD2DUP_UPD,
VLD3DUP_UPD,
VLD4DUP_UPD,
VLD1x2_UPD,
VLD1x3_UPD,
VLD1x4_UPD,
// NEON stores with post-increment base updates:
VST1_UPD,
VST2_UPD,
VST3_UPD,
VST4_UPD,
VST2LN_UPD,
VST3LN_UPD,
VST4LN_UPD,
VST1x2_UPD,
VST1x3_UPD,
VST1x4_UPD,
// Load/Store of dual registers
LDRD,
STRD,
LAST_MEMORY_OPCODE = STRD,
};
} // end namespace ARMISD
namespace ARM {
/// Possible values of current rounding mode, which is specified in bits
/// 23:22 of FPSCR.
enum Rounding {
RN = 0, // Round to Nearest
RP = 1, // Round towards Plus infinity
RM = 2, // Round towards Minus infinity
RZ = 3, // Round towards Zero
rmMask = 3 // Bit mask selecting rounding mode
};
// Bit position of rounding mode bits in FPSCR.
const unsigned RoundingBitsPos = 22;
// Bits of floating-point status. These are NZCV flags, QC bit and cumulative
// FP exception bits.
const unsigned FPStatusBits = 0xf800009f;
// Some bits in the FPSCR are not yet defined. They must be preserved when
// modifying the contents.
const unsigned FPReservedBits = 0x00006060;
} // namespace ARM
/// Define some predicates that are used for node matching.
namespace ARM {
bool isBitFieldInvertedMask(unsigned v);
} // end namespace ARM
//===--------------------------------------------------------------------===//
// ARMTargetLowering - ARM Implementation of the TargetLowering interface
class ARMTargetLowering : public TargetLowering {
// Copying needed for an outgoing byval argument.
enum ByValCopyKind {
// Argument is already in the correct location, no copy needed.
NoCopy,
// Argument value is currently in the local stack frame, needs copying to
// outgoing arguemnt area.
CopyOnce,
// Argument value is currently in the outgoing argument area, but not at
// the correct offset, so needs copying via a temporary in local stack
// space.
CopyViaTemp,
};
public:
explicit ARMTargetLowering(const TargetMachine &TM,
const ARMSubtarget &STI);
const ARMBaseTargetMachine &getTM() const;
unsigned getJumpTableEncoding() const override;
bool useSoftFloat() const override;
SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const override;
/// ReplaceNodeResults - Replace the results of node with an illegal result
/// type with new values built out of custom code.
void ReplaceNodeResults(SDNode *N, SmallVectorImpl<SDValue>&Results,
SelectionDAG &DAG) const override;
const char *getTargetNodeName(unsigned Opcode) const override;
bool isSelectSupported(SelectSupportKind Kind) const override {
// ARM does not support scalar condition selects on vectors.
return (Kind != ScalarCondVectorVal);
}
bool isReadOnly(const GlobalValue *GV) const;
/// getSetCCResultType - Return the value type to use for ISD::SETCC.
EVT getSetCCResultType(const DataLayout &DL, LLVMContext &Context,
EVT VT) const override;
MachineBasicBlock *
EmitInstrWithCustomInserter(MachineInstr &MI,
MachineBasicBlock *MBB) const override;
void AdjustInstrPostInstrSelection(MachineInstr &MI,
SDNode *Node) const override;
SDValue PerformCMOVCombine(SDNode *N, SelectionDAG &DAG) const;
SDValue PerformBRCONDCombine(SDNode *N, SelectionDAG &DAG) const;
SDValue PerformCMOVToBFICombine(SDNode *N, SelectionDAG &DAG) const;
SDValue PerformIntrinsicCombine(SDNode *N, DAGCombinerInfo &DCI) const;
SDValue PerformMVEExtCombine(SDNode *N, DAGCombinerInfo &DCI) const;
SDValue PerformMVETruncCombine(SDNode *N, DAGCombinerInfo &DCI) const;
SDValue PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const override;
bool SimplifyDemandedBitsForTargetNode(SDValue Op,
const APInt &OriginalDemandedBits,
const APInt &OriginalDemandedElts,
KnownBits &Known,
TargetLoweringOpt &TLO,
unsigned Depth) const override;
bool isDesirableToTransformToIntegerOp(unsigned Opc, EVT VT) const override;
/// allowsMisalignedMemoryAccesses - Returns true if the target allows
/// unaligned memory accesses of the specified type. Returns whether it
/// is "fast" by reference in the second argument.
bool allowsMisalignedMemoryAccesses(EVT VT, unsigned AddrSpace,
Align Alignment,
MachineMemOperand::Flags Flags,
unsigned *Fast) const override;
EVT getOptimalMemOpType(LLVMContext &Context, const MemOp &Op,
const AttributeList &FuncAttributes) const override;
bool isTruncateFree(Type *SrcTy, Type *DstTy) const override;
bool isTruncateFree(EVT SrcVT, EVT DstVT) const override;
bool isZExtFree(SDValue Val, EVT VT2) const override;
Type* shouldConvertSplatType(ShuffleVectorInst* SVI) const override;
bool isFNegFree(EVT VT) const override;
bool isVectorLoadExtDesirable(SDValue ExtVal) const override;
bool allowTruncateForTailCall(Type *Ty1, Type *Ty2) const override;
/// isLegalAddressingMode - Return true if the addressing mode represented
/// by AM is legal for this target, for a load/store of the specified type.
bool isLegalAddressingMode(const DataLayout &DL, const AddrMode &AM,
Type *Ty, unsigned AS,
Instruction *I = nullptr) const override;
bool isLegalT2ScaledAddressingMode(const AddrMode &AM, EVT VT) const;
/// Returns true if the addressing mode representing by AM is legal
/// for the Thumb1 target, for a load/store of the specified type.
bool isLegalT1ScaledAddressingMode(const AddrMode &AM, EVT VT) const;
/// isLegalICmpImmediate - Return true if the specified immediate is legal
/// icmp immediate, that is the target has icmp instructions which can
/// compare a register against the immediate without having to materialize
/// the immediate into a register.
bool isLegalICmpImmediate(int64_t Imm) const override;
/// isLegalAddImmediate - Return true if the specified immediate is legal
/// add immediate, that is the target has add instructions which can
/// add a register and the immediate without having to materialize
/// the immediate into a register.
bool isLegalAddImmediate(int64_t Imm) const override;
/// getPreIndexedAddressParts - returns true by value, base pointer and
/// offset pointer and addressing mode by reference if the node's address
/// can be legally represented as pre-indexed load / store address.
bool getPreIndexedAddressParts(SDNode *N, SDValue &Base, SDValue &Offset,
ISD::MemIndexedMode &AM,
SelectionDAG &DAG) const override;
/// getPostIndexedAddressParts - returns true by value, base pointer and
/// offset pointer and addressing mode by reference if this node can be
/// combined with a load / store to form a post-indexed load / store.
bool getPostIndexedAddressParts(SDNode *N, SDNode *Op, SDValue &Base,
SDValue &Offset, ISD::MemIndexedMode &AM,
SelectionDAG &DAG) const override;
void computeKnownBitsForTargetNode(const SDValue Op, KnownBits &Known,
const APInt &DemandedElts,
const SelectionDAG &DAG,
unsigned Depth) const override;
bool targetShrinkDemandedConstant(SDValue Op, const APInt &DemandedBits,
const APInt &DemandedElts,
TargetLoweringOpt &TLO) const override;
bool ExpandInlineAsm(CallInst *CI) const override;
ConstraintType getConstraintType(StringRef Constraint) const override;
/// Examine constraint string and operand type and determine a weight value.
/// The operand object must already have been set up with the operand type.
ConstraintWeight getSingleConstraintMatchWeight(
AsmOperandInfo &info, const char *constraint) const override;
std::pair<unsigned, const TargetRegisterClass *>
getRegForInlineAsmConstraint(const TargetRegisterInfo *TRI,
StringRef Constraint, MVT VT) const override;
const char *LowerXConstraint(EVT ConstraintVT) const override;
/// LowerAsmOperandForConstraint - Lower the specified operand into the Ops
/// vector. If it is invalid, don't add anything to Ops. If hasMemory is
/// true it means one of the asm constraint of the inline asm instruction
/// being processed is 'm'.
void LowerAsmOperandForConstraint(SDValue Op, StringRef Constraint,
std::vector<SDValue> &Ops,
SelectionDAG &DAG) const override;
InlineAsm::ConstraintCode
getInlineAsmMemConstraint(StringRef ConstraintCode) const override {
if (ConstraintCode == "Q")
return InlineAsm::ConstraintCode::Q;
if (ConstraintCode.size() == 2) {
if (ConstraintCode[0] == 'U') {
switch(ConstraintCode[1]) {
default:
break;
case 'm':
return InlineAsm::ConstraintCode::Um;
case 'n':
return InlineAsm::ConstraintCode::Un;
case 'q':
return InlineAsm::ConstraintCode::Uq;
case 's':
return InlineAsm::ConstraintCode::Us;
case 't':
return InlineAsm::ConstraintCode::Ut;
case 'v':
return InlineAsm::ConstraintCode::Uv;
case 'y':
return InlineAsm::ConstraintCode::Uy;
}
}
}
return TargetLowering::getInlineAsmMemConstraint(ConstraintCode);
}
const ARMSubtarget* getSubtarget() const {
return Subtarget;
}
/// getRegClassFor - Return the register class that should be used for the
/// specified value type.
const TargetRegisterClass *
getRegClassFor(MVT VT, bool isDivergent = false) const override;
bool shouldAlignPointerArgs(CallInst *CI, unsigned &MinSize,
Align &PrefAlign) const override;
/// createFastISel - This method returns a target specific FastISel object,
/// or null if the target does not support "fast" ISel.
FastISel *createFastISel(FunctionLoweringInfo &funcInfo,
const TargetLibraryInfo *libInfo) const override;
Sched::Preference getSchedulingPreference(SDNode *N) const override;
bool preferZeroCompareBranch() const override { return true; }
bool shouldExpandCmpUsingSelects(EVT VT) const override;
bool isMaskAndCmp0FoldingBeneficial(const Instruction &AndI) const override;
bool hasAndNotCompare(SDValue V) const override {
// We can use bics for any scalar.
return V.getValueType().isScalarInteger();
}
bool
isShuffleMaskLegal(ArrayRef<int> M, EVT VT) const override;
bool isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const override;
/// isFPImmLegal - Returns true if the target can instruction select the
/// specified FP immediate natively. If false, the legalizer will
/// materialize the FP immediate as a load from a constant pool.
bool isFPImmLegal(const APFloat &Imm, EVT VT,
bool ForCodeSize = false) const override;
bool getTgtMemIntrinsic(IntrinsicInfo &Info,
const CallInst &I,
MachineFunction &MF,
unsigned Intrinsic) const override;
/// Returns true if it is beneficial to convert a load of a constant
/// to just the constant itself.
bool shouldConvertConstantLoadToIntImm(const APInt &Imm,
Type *Ty) const override;
/// Return true if EXTRACT_SUBVECTOR is cheap for this result type
/// with this index.
bool isExtractSubvectorCheap(EVT ResVT, EVT SrcVT,
unsigned Index) const override;
bool shouldFormOverflowOp(unsigned Opcode, EVT VT,
bool MathUsed) const override {
// Using overflow ops for overflow checks only should beneficial on ARM.
return TargetLowering::shouldFormOverflowOp(Opcode, VT, true);
}
bool shouldReassociateReduction(unsigned Opc, EVT VT) const override {
return Opc != ISD::VECREDUCE_ADD;
}
/// Returns true if an argument of type Ty needs to be passed in a
/// contiguous block of registers in calling convention CallConv.
bool functionArgumentNeedsConsecutiveRegisters(
Type *Ty, CallingConv::ID CallConv, bool isVarArg,
const DataLayout &DL) const override;
/// If a physical register, this returns the register that receives the
/// exception address on entry to an EH pad.
Register
getExceptionPointerRegister(const Constant *PersonalityFn) const override;
/// If a physical register, this returns the register that receives the
/// exception typeid on entry to a landing pad.
Register
getExceptionSelectorRegister(const Constant *PersonalityFn) const override;
Instruction *makeDMB(IRBuilderBase &Builder, ARM_MB::MemBOpt Domain) const;
Value *emitLoadLinked(IRBuilderBase &Builder, Type *ValueTy, Value *Addr,
AtomicOrdering Ord) const override;
Value *emitStoreConditional(IRBuilderBase &Builder, Value *Val, Value *Addr,
AtomicOrdering Ord) const override;
void
emitAtomicCmpXchgNoStoreLLBalance(IRBuilderBase &Builder) const override;
Instruction *emitLeadingFence(IRBuilderBase &Builder, Instruction *Inst,
AtomicOrdering Ord) const override;
Instruction *emitTrailingFence(IRBuilderBase &Builder, Instruction *Inst,
AtomicOrdering Ord) const override;
unsigned getMaxSupportedInterleaveFactor() const override;
bool lowerInterleavedLoad(Instruction *Load, Value *Mask,
ArrayRef<ShuffleVectorInst *> Shuffles,
ArrayRef<unsigned> Indices, unsigned Factor,
const APInt &GapMask) const override;
bool lowerInterleavedStore(Instruction *Store, Value *Mask,
ShuffleVectorInst *SVI,
unsigned Factor) const override;
bool shouldInsertFencesForAtomic(const Instruction *I) const override;
TargetLoweringBase::AtomicExpansionKind
shouldExpandAtomicLoadInIR(LoadInst *LI) const override;
TargetLoweringBase::AtomicExpansionKind
shouldExpandAtomicStoreInIR(StoreInst *SI) const override;
TargetLoweringBase::AtomicExpansionKind
shouldExpandAtomicRMWInIR(AtomicRMWInst *AI) const override;
TargetLoweringBase::AtomicExpansionKind
shouldExpandAtomicCmpXchgInIR(AtomicCmpXchgInst *AI) const override;
bool useLoadStackGuardNode(const Module &M) const override;
void insertSSPDeclarations(Module &M) const override;
Function *getSSPStackGuardCheck(const Module &M) const override;
bool canCombineStoreAndExtract(Type *VectorTy, Value *Idx,
unsigned &Cost) const override;
bool canMergeStoresTo(unsigned AddressSpace, EVT MemVT,
const MachineFunction &MF) const override {
// Do not merge to larger than i32.
return (MemVT.getSizeInBits() <= 32);
}
bool isCheapToSpeculateCttz(Type *Ty) const override;
bool isCheapToSpeculateCtlz(Type *Ty) const override;
bool convertSetCCLogicToBitwiseLogic(EVT VT) const override {
return VT.isScalarInteger();
}
bool supportSwiftError() const override {
return true;
}
bool supportSplitCSR(MachineFunction *MF) const override {
return MF->getFunction().getCallingConv() == CallingConv::CXX_FAST_TLS &&
MF->getFunction().hasFnAttribute(Attribute::NoUnwind);
}
bool hasStandaloneRem(EVT VT) const override {
return HasStandaloneRem;
}
ShiftLegalizationStrategy
preferredShiftLegalizationStrategy(SelectionDAG &DAG, SDNode *N,
unsigned ExpansionFactor) const override;
CCAssignFn *CCAssignFnForCall(CallingConv::ID CC, bool isVarArg) const;
CCAssignFn *CCAssignFnForReturn(CallingConv::ID CC, bool isVarArg) const;
/// Returns true if \p VecTy is a legal interleaved access type. This
/// function checks the vector element type and the overall width of the
/// vector.
bool isLegalInterleavedAccessType(unsigned Factor, FixedVectorType *VecTy,
Align Alignment,
const DataLayout &DL) const;
bool isMulAddWithConstProfitable(SDValue AddNode,
SDValue ConstNode) const override;
bool alignLoopsWithOptSize() const override;
/// Returns the number of interleaved accesses that will be generated when
/// lowering accesses of the given type.
unsigned getNumInterleavedAccesses(VectorType *VecTy,
const DataLayout &DL) const;
void finalizeLowering(MachineFunction &MF) const override;
/// Return the correct alignment for the current calling convention.
Align getABIAlignmentForCallingConv(Type *ArgTy,
const DataLayout &DL) const override;
bool isDesirableToCommuteWithShift(const SDNode *N,
CombineLevel Level) const override;
bool isDesirableToCommuteXorWithShift(const SDNode *N) const override;
bool shouldFoldConstantShiftPairToMask(const SDNode *N,
CombineLevel Level) const override;
bool shouldFoldSelectWithIdentityConstant(unsigned BinOpcode, EVT VT,
unsigned SelectOpcode, SDValue X,
SDValue Y) const override;
bool preferIncOfAddToSubOfNot(EVT VT) const override;
bool shouldConvertFpToSat(unsigned Op, EVT FPVT, EVT VT) const override;
bool isComplexDeinterleavingSupported() const override;
bool isComplexDeinterleavingOperationSupported(
ComplexDeinterleavingOperation Operation, Type *Ty) const override;
Value *createComplexDeinterleavingIR(
IRBuilderBase &B, ComplexDeinterleavingOperation OperationType,
ComplexDeinterleavingRotation Rotation, Value *InputA, Value *InputB,
Value *Accumulator = nullptr) const override;
bool softPromoteHalfType() const override { return true; }
bool useFPRegsForHalfType() const override { return true; }
protected:
std::pair<const TargetRegisterClass *, uint8_t>
findRepresentativeClass(const TargetRegisterInfo *TRI,
MVT VT) const override;
private:
/// Subtarget - Keep a pointer to the ARMSubtarget around so that we can
/// make the right decision when generating code for different targets.
const ARMSubtarget *Subtarget;
const TargetRegisterInfo *RegInfo;
const InstrItineraryData *Itins;
// TODO: remove this, and have shouldInsertFencesForAtomic do the proper
// check.
bool InsertFencesForAtomic;
bool HasStandaloneRem = true;
void addTypeForNEON(MVT VT, MVT PromotedLdStVT);
void addDRTypeForNEON(MVT VT);
void addQRTypeForNEON(MVT VT);
std::pair<SDValue, SDValue> getARMXALUOOp(SDValue Op, SelectionDAG &DAG, SDValue &ARMcc) const;
using RegsToPassVector = SmallVector<std::pair<unsigned, SDValue>, 8>;
void PassF64ArgInRegs(const SDLoc &dl, SelectionDAG &DAG, SDValue Chain,
SDValue &Arg, RegsToPassVector &RegsToPass,
CCValAssign &VA, CCValAssign &NextVA,
SDValue &StackPtr,
SmallVectorImpl<SDValue> &MemOpChains,
bool IsTailCall,
int SPDiff) const;
SDValue GetF64FormalArgument(CCValAssign &VA, CCValAssign &NextVA,
SDValue &Root, SelectionDAG &DAG,
const SDLoc &dl) const;
CallingConv::ID getEffectiveCallingConv(CallingConv::ID CC,
bool isVarArg) const;
CCAssignFn *CCAssignFnForNode(CallingConv::ID CC, bool Return,
bool isVarArg) const;
std::pair<SDValue, MachinePointerInfo>
computeAddrForCallArg(const SDLoc &dl, SelectionDAG &DAG,
const CCValAssign &VA, SDValue StackPtr,
bool IsTailCall, int SPDiff) const;
ByValCopyKind ByValNeedsCopyForTailCall(SelectionDAG &DAG, SDValue Src,
SDValue Dst,
ISD::ArgFlagsTy Flags) const;
SDValue LowerEH_SJLJ_SETJMP(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerEH_SJLJ_LONGJMP(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerEH_SJLJ_SETUP_DISPATCH(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerINTRINSIC_VOID(SDValue Op, SelectionDAG &DAG,
const ARMSubtarget *Subtarget) const;
SDValue LowerINTRINSIC_WO_CHAIN(SDValue Op, SelectionDAG &DAG,
const ARMSubtarget *Subtarget) const;
SDValue LowerBlockAddress(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerConstantPool(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerGlobalAddressDarwin(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerGlobalAddressELF(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerGlobalAddressWindows(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerToTLSGeneralDynamicModel(GlobalAddressSDNode *GA,
SelectionDAG &DAG) const;
SDValue LowerToTLSExecModels(GlobalAddressSDNode *GA,
SelectionDAG &DAG,
TLSModel::Model model) const;
SDValue LowerGlobalTLSAddressDarwin(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerGlobalTLSAddressWindows(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerBR_JT(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerSignedALUO(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerUnsignedALUO(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerSELECT(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerBRCOND(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerBR_CC(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerFCOPYSIGN(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerRETURNADDR(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerShiftRightParts(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerShiftLeftParts(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerGET_ROUNDING(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerSET_ROUNDING(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerSET_FPMODE(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerRESET_FPMODE(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerConstantFP(SDValue Op, SelectionDAG &DAG,
const ARMSubtarget *ST) const;
SDValue LowerBUILD_VECTOR(SDValue Op, SelectionDAG &DAG,
const ARMSubtarget *ST) const;
SDValue LowerINSERT_VECTOR_ELT(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerFSINCOS(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerDivRem(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerDIV_Windows(SDValue Op, SelectionDAG &DAG, bool Signed) const;
void ExpandDIV_Windows(SDValue Op, SelectionDAG &DAG, bool Signed,
SmallVectorImpl<SDValue> &Results) const;
SDValue ExpandBITCAST(SDNode *N, SelectionDAG &DAG,
const ARMSubtarget *Subtarget) const;
SDValue LowerWindowsDIVLibCall(SDValue Op, SelectionDAG &DAG, bool Signed,
SDValue &Chain) const;
SDValue LowerREM(SDNode *N, SelectionDAG &DAG) const;
SDValue LowerDYNAMIC_STACKALLOC(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerFP_ROUND(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerFP_EXTEND(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerFP_TO_INT(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerINT_TO_FP(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerFSETCC(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerSPONENTRY(SDValue Op, SelectionDAG &DAG) const;
void LowerLOAD(SDNode *N, SmallVectorImpl<SDValue> &Results,
SelectionDAG &DAG) const;
SDValue LowerFP_TO_BF16(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerCMP(SDValue Op, SelectionDAG &DAG) const;
Register getRegisterByName(const char* RegName, LLT VT,
const MachineFunction &MF) const override;
SDValue BuildSDIVPow2(SDNode *N, const APInt &Divisor, SelectionDAG &DAG,
SmallVectorImpl<SDNode *> &Created) const override;
bool isFMAFasterThanFMulAndFAdd(const MachineFunction &MF,
EVT VT) const override;
SDValue MoveToHPR(const SDLoc &dl, SelectionDAG &DAG, MVT LocVT, MVT ValVT,
SDValue Val) const;
SDValue MoveFromHPR(const SDLoc &dl, SelectionDAG &DAG, MVT LocVT,
MVT ValVT, SDValue Val) const;
SDValue ReconstructShuffle(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerCallResult(SDValue Chain, SDValue InGlue,
CallingConv::ID CallConv, bool isVarArg,
const SmallVectorImpl<ISD::InputArg> &Ins,
const SDLoc &dl, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals, bool isThisReturn,
SDValue ThisVal, bool isCmseNSCall) const;
void initializeSplitCSR(MachineBasicBlock *Entry) const override;
void insertCopiesSplitCSR(
MachineBasicBlock *Entry,
const SmallVectorImpl<MachineBasicBlock *> &Exits) const override;
bool splitValueIntoRegisterParts(
SelectionDAG & DAG, const SDLoc &DL, SDValue Val, SDValue *Parts,
unsigned NumParts, MVT PartVT, std::optional<CallingConv::ID> CC)
const override;
SDValue joinRegisterPartsIntoValue(
SelectionDAG & DAG, const SDLoc &DL, const SDValue *Parts,
unsigned NumParts, MVT PartVT, EVT ValueVT,
std::optional<CallingConv::ID> CC) const override;
SDValue
LowerFormalArguments(SDValue Chain, CallingConv::ID CallConv, bool isVarArg,
const SmallVectorImpl<ISD::InputArg> &Ins,
const SDLoc &dl, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals) const override;
int StoreByValRegs(CCState &CCInfo, SelectionDAG &DAG, const SDLoc &dl,
SDValue &Chain, const Value *OrigArg,
unsigned InRegsParamRecordIdx, int ArgOffset,
unsigned ArgSize) const;
void VarArgStyleRegisters(CCState &CCInfo, SelectionDAG &DAG,
const SDLoc &dl, SDValue &Chain,
unsigned ArgOffset, unsigned TotalArgRegsSaveSize,
bool ForceMutable = false) const;
SDValue LowerCall(TargetLowering::CallLoweringInfo &CLI,
SmallVectorImpl<SDValue> &InVals) const override;
/// HandleByVal - Target-specific cleanup for ByVal support.
void HandleByVal(CCState *, unsigned &, Align) const override;
/// IsEligibleForTailCallOptimization - Check whether the call is eligible
/// for tail call optimization. Targets which want to do tail call
/// optimization should implement this function.
bool IsEligibleForTailCallOptimization(
TargetLowering::CallLoweringInfo &CLI, CCState &CCInfo,
SmallVectorImpl<CCValAssign> &ArgLocs, const bool isIndirect) const;
bool CanLowerReturn(CallingConv::ID CallConv,
MachineFunction &MF, bool isVarArg,
const SmallVectorImpl<ISD::OutputArg> &Outs,
LLVMContext &Context, const Type *RetTy) const override;
SDValue LowerReturn(SDValue Chain, CallingConv::ID CallConv, bool isVarArg,
const SmallVectorImpl<ISD::OutputArg> &Outs,
const SmallVectorImpl<SDValue> &OutVals,
const SDLoc &dl, SelectionDAG &DAG) const override;
bool isUsedByReturnOnly(SDNode *N, SDValue &Chain) const override;
bool mayBeEmittedAsTailCall(const CallInst *CI) const override;
bool shouldConsiderGEPOffsetSplit() const override { return true; }
bool isUnsupportedFloatingType(EVT VT) const;
SDValue getCMOV(const SDLoc &dl, EVT VT, SDValue FalseVal, SDValue TrueVal,
SDValue ARMcc, SDValue Flags, SelectionDAG &DAG) const;
SDValue getARMCmp(SDValue LHS, SDValue RHS, ISD::CondCode CC,
SDValue &ARMcc, SelectionDAG &DAG, const SDLoc &dl) const;
SDValue getVFPCmp(SDValue LHS, SDValue RHS, SelectionDAG &DAG,
const SDLoc &dl, bool Signaling = false) const;
SDValue OptimizeVFPBrcond(SDValue Op, SelectionDAG &DAG) const;
void SetupEntryBlockForSjLj(MachineInstr &MI, MachineBasicBlock *MBB,
MachineBasicBlock *DispatchBB, int FI) const;
void EmitSjLjDispatchBlock(MachineInstr &MI, MachineBasicBlock *MBB) const;
MachineBasicBlock *EmitStructByval(MachineInstr &MI,
MachineBasicBlock *MBB) const;
MachineBasicBlock *EmitLowered__chkstk(MachineInstr &MI,
MachineBasicBlock *MBB) const;
MachineBasicBlock *EmitLowered__dbzchk(MachineInstr &MI,
MachineBasicBlock *MBB) const;
void addMVEVectorTypes(bool HasMVEFP);
void addAllExtLoads(const MVT From, const MVT To, LegalizeAction Action);
void setAllExpand(MVT VT);
};
enum VMOVModImmType {
VMOVModImm,
VMVNModImm,
MVEVMVNModImm,
OtherModImm
};
namespace ARM {
FastISel *createFastISel(FunctionLoweringInfo &funcInfo,
const TargetLibraryInfo *libInfo);
} // end namespace ARM
} // end namespace llvm
#endif // LLVM_LIB_TARGET_ARM_ARMISELLOWERING_H
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