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llvm-6502/lib/Target/PowerPC/PPCISelLowering.h
Bill Schmidt 49b3971b70 [PowerPC] Fix reverted patch r227976 to avoid register assignment issues 
See full discussion in http://reviews.llvm.org/D7491.

We now hide the add-immediate and call instructions together in a
separate pseudo-op, which is tagged to define GPR3 and clobber the
call-killed registers.  The PPCTLSDynamicCall pass prior to RA now
expands this op into the two separate addi and call ops, with explicit
definitions of GPR3 on both instructions, and explicit clobbers on the
call instruction.  The pass is now marked as requiring and preserving
the LiveIntervals and SlotIndexes analyses, and fixes these up after
the replacement sequences are introduced.

Self-hosting has been verified on LE P8 and BE P7 with various
optimization levels, etc.  It has also been verified with the
--no-tls-optimize flag workaround removed.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@228725 91177308-0d34-0410-b5e6-96231b3b80d8
2015-02-10 19:09:05 +00:00

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//===-- PPCISelLowering.h - PPC32 DAG Lowering Interface --------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the interfaces that PPC uses to lower LLVM code into a
// selection DAG.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_TARGET_POWERPC_PPCISELLOWERING_H
#define LLVM_LIB_TARGET_POWERPC_PPCISELLOWERING_H
#include "PPC.h"
#include "PPCInstrInfo.h"
#include "PPCRegisterInfo.h"
#include "llvm/CodeGen/CallingConvLower.h"
#include "llvm/CodeGen/SelectionDAG.h"
#include "llvm/Target/TargetLowering.h"
namespace llvm {
namespace PPCISD {
enum NodeType {
// Start the numbering where the builtin ops and target ops leave off.
FIRST_NUMBER = ISD::BUILTIN_OP_END,
/// FSEL - Traditional three-operand fsel node.
///
FSEL,
/// FCFID - The FCFID instruction, taking an f64 operand and producing
/// and f64 value containing the FP representation of the integer that
/// was temporarily in the f64 operand.
FCFID,
/// Newer FCFID[US] integer-to-floating-point conversion instructions for
/// unsigned integers and single-precision outputs.
FCFIDU, FCFIDS, FCFIDUS,
/// FCTI[D,W]Z - The FCTIDZ and FCTIWZ instructions, taking an f32 or f64
/// operand, producing an f64 value containing the integer representation
/// of that FP value.
FCTIDZ, FCTIWZ,
/// Newer FCTI[D,W]UZ floating-point-to-integer conversion instructions for
/// unsigned integers.
FCTIDUZ, FCTIWUZ,
/// Reciprocal estimate instructions (unary FP ops).
FRE, FRSQRTE,
// VMADDFP, VNMSUBFP - The VMADDFP and VNMSUBFP instructions, taking
// three v4f32 operands and producing a v4f32 result.
VMADDFP, VNMSUBFP,
/// VPERM - The PPC VPERM Instruction.
///
VPERM,
/// The CMPB instruction (takes two operands of i32 or i64).
CMPB,
/// Hi/Lo - These represent the high and low 16-bit parts of a global
/// address respectively. These nodes have two operands, the first of
/// which must be a TargetGlobalAddress, and the second of which must be a
/// Constant. Selected naively, these turn into 'lis G+C' and 'li G+C',
/// though these are usually folded into other nodes.
Hi, Lo,
TOC_ENTRY,
/// The following two target-specific nodes are used for calls through
/// function pointers in the 64-bit SVR4 ABI.
/// OPRC, CHAIN = DYNALLOC(CHAIN, NEGSIZE, FRAME_INDEX)
/// This instruction is lowered in PPCRegisterInfo::eliminateFrameIndex to
/// compute an allocation on the stack.
DYNALLOC,
/// GlobalBaseReg - On Darwin, this node represents the result of the mflr
/// at function entry, used for PIC code.
GlobalBaseReg,
/// These nodes represent the 32-bit PPC shifts that operate on 6-bit
/// shift amounts. These nodes are generated by the multi-precision shift
/// code.
SRL, SRA, SHL,
/// The combination of sra[wd]i and addze used to implemented signed
/// integer division by a power of 2. The first operand is the dividend,
/// and the second is the constant shift amount (representing the
/// divisor).
SRA_ADDZE,
/// CALL - A direct function call.
/// CALL_NOP is a call with the special NOP which follows 64-bit
/// SVR4 calls.
CALL, CALL_NOP,
/// CHAIN,FLAG = MTCTR(VAL, CHAIN[, INFLAG]) - Directly corresponds to a
/// MTCTR instruction.
MTCTR,
/// CHAIN,FLAG = BCTRL(CHAIN, INFLAG) - Directly corresponds to a
/// BCTRL instruction.
BCTRL,
/// CHAIN,FLAG = BCTRL(CHAIN, ADDR, INFLAG) - The combination of a bctrl
/// instruction and the TOC reload required on SVR4 PPC64.
BCTRL_LOAD_TOC,
/// Return with a flag operand, matched by 'blr'
RET_FLAG,
/// R32 = MFOCRF(CRREG, INFLAG) - Represents the MFOCRF instruction.
/// This copies the bits corresponding to the specified CRREG into the
/// resultant GPR. Bits corresponding to other CR regs are undefined.
MFOCRF,
// FIXME: Remove these once the ANDI glue bug is fixed:
/// i1 = ANDIo_1_[EQ|GT]_BIT(i32 or i64 x) - Represents the result of the
/// eq or gt bit of CR0 after executing andi. x, 1. This is used to
/// implement truncation of i32 or i64 to i1.
ANDIo_1_EQ_BIT, ANDIo_1_GT_BIT,
// READ_TIME_BASE - A read of the 64-bit time-base register on a 32-bit
// target (returns (Lo, Hi)). It takes a chain operand.
READ_TIME_BASE,
// EH_SJLJ_SETJMP - SjLj exception handling setjmp.
EH_SJLJ_SETJMP,
// EH_SJLJ_LONGJMP - SjLj exception handling longjmp.
EH_SJLJ_LONGJMP,
/// RESVEC = VCMP(LHS, RHS, OPC) - Represents one of the altivec VCMP*
/// instructions. For lack of better number, we use the opcode number
/// encoding for the OPC field to identify the compare. For example, 838
/// is VCMPGTSH.
VCMP,
/// RESVEC, OUTFLAG = VCMPo(LHS, RHS, OPC) - Represents one of the
/// altivec VCMP*o instructions. For lack of better number, we use the
/// opcode number encoding for the OPC field to identify the compare. For
/// example, 838 is VCMPGTSH.
VCMPo,
/// CHAIN = COND_BRANCH CHAIN, CRRC, OPC, DESTBB [, INFLAG] - This
/// corresponds to the COND_BRANCH pseudo instruction. CRRC is the
/// condition register to branch on, OPC is the branch opcode to use (e.g.
/// PPC::BLE), DESTBB is the destination block to branch to, and INFLAG is
/// an optional input flag argument.
COND_BRANCH,
/// CHAIN = BDNZ CHAIN, DESTBB - These are used to create counter-based
/// loops.
BDNZ, BDZ,
/// F8RC = FADDRTZ F8RC, F8RC - This is an FADD done with rounding
/// towards zero. Used only as part of the long double-to-int
/// conversion sequence.
FADDRTZ,
/// F8RC = MFFS - This moves the FPSCR (not modeled) into the register.
MFFS,
/// LARX = This corresponds to PPC l{w|d}arx instrcution: load and
/// reserve indexed. This is used to implement atomic operations.
LARX,
/// STCX = This corresponds to PPC stcx. instrcution: store conditional
/// indexed. This is used to implement atomic operations.
STCX,
/// TC_RETURN - A tail call return.
/// operand #0 chain
/// operand #1 callee (register or absolute)
/// operand #2 stack adjustment
/// operand #3 optional in flag
TC_RETURN,
/// ch, gl = CR6[UN]SET ch, inglue - Toggle CR bit 6 for SVR4 vararg calls
CR6SET,
CR6UNSET,
/// GPRC = address of _GLOBAL_OFFSET_TABLE_. Used by initial-exec TLS
/// on PPC32.
PPC32_GOT,
/// GPRC = address of _GLOBAL_OFFSET_TABLE_. Used by general dynamic and
/// local dynamic TLS on PPC32.
PPC32_PICGOT,
/// G8RC = ADDIS_GOT_TPREL_HA %X2, Symbol - Used by the initial-exec
/// TLS model, produces an ADDIS8 instruction that adds the GOT
/// base to sym\@got\@tprel\@ha.
ADDIS_GOT_TPREL_HA,
/// G8RC = LD_GOT_TPREL_L Symbol, G8RReg - Used by the initial-exec
/// TLS model, produces a LD instruction with base register G8RReg
/// and offset sym\@got\@tprel\@l. This completes the addition that
/// finds the offset of "sym" relative to the thread pointer.
LD_GOT_TPREL_L,
/// G8RC = ADD_TLS G8RReg, Symbol - Used by the initial-exec TLS
/// model, produces an ADD instruction that adds the contents of
/// G8RReg to the thread pointer. Symbol contains a relocation
/// sym\@tls which is to be replaced by the thread pointer and
/// identifies to the linker that the instruction is part of a
/// TLS sequence.
ADD_TLS,
/// G8RC = ADDIS_TLSGD_HA %X2, Symbol - For the general-dynamic TLS
/// model, produces an ADDIS8 instruction that adds the GOT base
/// register to sym\@got\@tlsgd\@ha.
ADDIS_TLSGD_HA,
/// %X3 = ADDI_TLSGD_L G8RReg, Symbol - For the general-dynamic TLS
/// model, produces an ADDI8 instruction that adds G8RReg to
/// sym\@got\@tlsgd\@l and stores the result in X3. Hidden by
/// ADDIS_TLSGD_L_ADDR until after register assignment.
ADDI_TLSGD_L,
/// %X3 = GET_TLS_ADDR %X3, Symbol - For the general-dynamic TLS
/// model, produces a call to __tls_get_addr(sym\@tlsgd). Hidden by
/// ADDIS_TLSGD_L_ADDR until after register assignment.
GET_TLS_ADDR,
/// G8RC = ADDI_TLSGD_L_ADDR G8RReg, Symbol, Symbol - Op that
/// combines ADDI_TLSGD_L and GET_TLS_ADDR until expansion following
/// register assignment.
ADDI_TLSGD_L_ADDR,
/// G8RC = ADDIS_TLSLD_HA %X2, Symbol - For the local-dynamic TLS
/// model, produces an ADDIS8 instruction that adds the GOT base
/// register to sym\@got\@tlsld\@ha.
ADDIS_TLSLD_HA,
/// %X3 = ADDI_TLSLD_L G8RReg, Symbol - For the local-dynamic TLS
/// model, produces an ADDI8 instruction that adds G8RReg to
/// sym\@got\@tlsld\@l and stores the result in X3. Hidden by
/// ADDIS_TLSLD_L_ADDR until after register assignment.
ADDI_TLSLD_L,
/// %X3 = GET_TLSLD_ADDR %X3, Symbol - For the local-dynamic TLS
/// model, produces a call to __tls_get_addr(sym\@tlsld). Hidden by
/// ADDIS_TLSLD_L_ADDR until after register assignment.
GET_TLSLD_ADDR,
/// G8RC = ADDI_TLSLD_L_ADDR G8RReg, Symbol, Symbol - Op that
/// combines ADDI_TLSLD_L and GET_TLSLD_ADDR until expansion
/// following register assignment.
ADDI_TLSLD_L_ADDR,
/// G8RC = ADDIS_DTPREL_HA %X3, Symbol - For the local-dynamic TLS
/// model, produces an ADDIS8 instruction that adds X3 to
/// sym\@dtprel\@ha.
ADDIS_DTPREL_HA,
/// G8RC = ADDI_DTPREL_L G8RReg, Symbol - For the local-dynamic TLS
/// model, produces an ADDI8 instruction that adds G8RReg to
/// sym\@got\@dtprel\@l.
ADDI_DTPREL_L,
/// VRRC = VADD_SPLAT Elt, EltSize - Temporary node to be expanded
/// during instruction selection to optimize a BUILD_VECTOR into
/// operations on splats. This is necessary to avoid losing these
/// optimizations due to constant folding.
VADD_SPLAT,
/// CHAIN = SC CHAIN, Imm128 - System call. The 7-bit unsigned
/// operand identifies the operating system entry point.
SC,
/// VSRC, CHAIN = XXSWAPD CHAIN, VSRC - Occurs only for little
/// endian. Maps to an xxswapd instruction that corrects an lxvd2x
/// or stxvd2x instruction. The chain is necessary because the
/// sequence replaces a load and needs to provide the same number
/// of outputs.
XXSWAPD,
/// CHAIN = STBRX CHAIN, GPRC, Ptr, Type - This is a
/// byte-swapping store instruction. It byte-swaps the low "Type" bits of
/// the GPRC input, then stores it through Ptr. Type can be either i16 or
/// i32.
STBRX = ISD::FIRST_TARGET_MEMORY_OPCODE,
/// GPRC, CHAIN = LBRX CHAIN, Ptr, Type - This is a
/// byte-swapping load instruction. It loads "Type" bits, byte swaps it,
/// then puts it in the bottom bits of the GPRC. TYPE can be either i16
/// or i32.
LBRX,
/// STFIWX - The STFIWX instruction. The first operand is an input token
/// chain, then an f64 value to store, then an address to store it to.
STFIWX,
/// GPRC, CHAIN = LFIWAX CHAIN, Ptr - This is a floating-point
/// load which sign-extends from a 32-bit integer value into the
/// destination 64-bit register.
LFIWAX,
/// GPRC, CHAIN = LFIWZX CHAIN, Ptr - This is a floating-point
/// load which zero-extends from a 32-bit integer value into the
/// destination 64-bit register.
LFIWZX,
/// G8RC = ADDIS_TOC_HA %X2, Symbol - For medium and large code model,
/// produces an ADDIS8 instruction that adds the TOC base register to
/// sym\@toc\@ha.
ADDIS_TOC_HA,
/// G8RC = LD_TOC_L Symbol, G8RReg - For medium and large code model,
/// produces a LD instruction with base register G8RReg and offset
/// sym\@toc\@l. Preceded by an ADDIS_TOC_HA to form a full 32-bit offset.
LD_TOC_L,
/// G8RC = ADDI_TOC_L G8RReg, Symbol - For medium code model, produces
/// an ADDI8 instruction that adds G8RReg to sym\@toc\@l.
/// Preceded by an ADDIS_TOC_HA to form a full 32-bit offset.
ADDI_TOC_L,
/// VSRC, CHAIN = LXVD2X_LE CHAIN, Ptr - Occurs only for little endian.
/// Maps directly to an lxvd2x instruction that will be followed by
/// an xxswapd.
LXVD2X,
/// CHAIN = STXVD2X CHAIN, VSRC, Ptr - Occurs only for little endian.
/// Maps directly to an stxvd2x instruction that will be preceded by
/// an xxswapd.
STXVD2X
};
}
/// Define some predicates that are used for node matching.
namespace PPC {
/// isVPKUHUMShuffleMask - Return true if this is the shuffle mask for a
/// VPKUHUM instruction.
bool isVPKUHUMShuffleMask(ShuffleVectorSDNode *N, unsigned ShuffleKind,
SelectionDAG &DAG);
/// isVPKUWUMShuffleMask - Return true if this is the shuffle mask for a
/// VPKUWUM instruction.
bool isVPKUWUMShuffleMask(ShuffleVectorSDNode *N, unsigned ShuffleKind,
SelectionDAG &DAG);
/// isVMRGLShuffleMask - Return true if this is a shuffle mask suitable for
/// a VRGL* instruction with the specified unit size (1,2 or 4 bytes).
bool isVMRGLShuffleMask(ShuffleVectorSDNode *N, unsigned UnitSize,
unsigned ShuffleKind, SelectionDAG &DAG);
/// isVMRGHShuffleMask - Return true if this is a shuffle mask suitable for
/// a VRGH* instruction with the specified unit size (1,2 or 4 bytes).
bool isVMRGHShuffleMask(ShuffleVectorSDNode *N, unsigned UnitSize,
unsigned ShuffleKind, SelectionDAG &DAG);
/// isVSLDOIShuffleMask - If this is a vsldoi shuffle mask, return the
/// shift amount, otherwise return -1.
int isVSLDOIShuffleMask(SDNode *N, unsigned ShuffleKind,
SelectionDAG &DAG);
/// isSplatShuffleMask - Return true if the specified VECTOR_SHUFFLE operand
/// specifies a splat of a single element that is suitable for input to
/// VSPLTB/VSPLTH/VSPLTW.
bool isSplatShuffleMask(ShuffleVectorSDNode *N, unsigned EltSize);
/// isAllNegativeZeroVector - Returns true if all elements of build_vector
/// are -0.0.
bool isAllNegativeZeroVector(SDNode *N);
/// getVSPLTImmediate - Return the appropriate VSPLT* immediate to splat the
/// specified isSplatShuffleMask VECTOR_SHUFFLE mask.
unsigned getVSPLTImmediate(SDNode *N, unsigned EltSize, SelectionDAG &DAG);
/// get_VSPLTI_elt - If this is a build_vector of constants which can be
/// formed by using a vspltis[bhw] instruction of the specified element
/// size, return the constant being splatted. The ByteSize field indicates
/// the number of bytes of each element [124] -> [bhw].
SDValue get_VSPLTI_elt(SDNode *N, unsigned ByteSize, SelectionDAG &DAG);
}
class PPCTargetLowering : public TargetLowering {
const PPCSubtarget &Subtarget;
public:
explicit PPCTargetLowering(const PPCTargetMachine &TM,
const PPCSubtarget &STI);
/// getTargetNodeName() - This method returns the name of a target specific
/// DAG node.
const char *getTargetNodeName(unsigned Opcode) const override;
MVT getScalarShiftAmountTy(EVT LHSTy) const override { return MVT::i32; }
bool isCheapToSpeculateCttz() const override {
return true;
}
bool isCheapToSpeculateCtlz() const override {
return true;
}
/// getSetCCResultType - Return the ISD::SETCC ValueType
EVT getSetCCResultType(LLVMContext &Context, EVT VT) const override;
/// Return true if target always beneficiates from combining into FMA for a
/// given value type. This must typically return false on targets where FMA
/// takes more cycles to execute than FADD.
bool enableAggressiveFMAFusion(EVT VT) 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;
/// SelectAddressRegReg - Given the specified addressed, check to see if it
/// can be represented as an indexed [r+r] operation. Returns false if it
/// can be more efficiently represented with [r+imm].
bool SelectAddressRegReg(SDValue N, SDValue &Base, SDValue &Index,
SelectionDAG &DAG) const;
/// SelectAddressRegImm - Returns true if the address N can be represented
/// by a base register plus a signed 16-bit displacement [r+imm], and if it
/// is not better represented as reg+reg. If Aligned is true, only accept
/// displacements suitable for STD and friends, i.e. multiples of 4.
bool SelectAddressRegImm(SDValue N, SDValue &Disp, SDValue &Base,
SelectionDAG &DAG, bool Aligned) const;
/// SelectAddressRegRegOnly - Given the specified addressed, force it to be
/// represented as an indexed [r+r] operation.
bool SelectAddressRegRegOnly(SDValue N, SDValue &Base, SDValue &Index,
SelectionDAG &DAG) const;
Sched::Preference getSchedulingPreference(SDNode *N) const override;
/// LowerOperation - Provide custom lowering hooks for some operations.
///
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;
SDValue expandVSXLoadForLE(SDNode *N, DAGCombinerInfo &DCI) const;
SDValue expandVSXStoreForLE(SDNode *N, DAGCombinerInfo &DCI) const;
SDValue PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const override;
SDValue BuildSDIVPow2(SDNode *N, const APInt &Divisor, SelectionDAG &DAG,
std::vector<SDNode *> *Created) const override;
unsigned getRegisterByName(const char* RegName, EVT VT) const override;
void computeKnownBitsForTargetNode(const SDValue Op,
APInt &KnownZero,
APInt &KnownOne,
const SelectionDAG &DAG,
unsigned Depth = 0) const override;
unsigned getPrefLoopAlignment(MachineLoop *ML) const override;
Instruction* emitLeadingFence(IRBuilder<> &Builder, AtomicOrdering Ord,
bool IsStore, bool IsLoad) const override;
Instruction* emitTrailingFence(IRBuilder<> &Builder, AtomicOrdering Ord,
bool IsStore, bool IsLoad) const override;
MachineBasicBlock *
EmitInstrWithCustomInserter(MachineInstr *MI,
MachineBasicBlock *MBB) const override;
MachineBasicBlock *EmitAtomicBinary(MachineInstr *MI,
MachineBasicBlock *MBB, bool is64Bit,
unsigned BinOpcode) const;
MachineBasicBlock *EmitPartwordAtomicBinary(MachineInstr *MI,
MachineBasicBlock *MBB,
bool is8bit, unsigned Opcode) const;
MachineBasicBlock *emitEHSjLjSetJmp(MachineInstr *MI,
MachineBasicBlock *MBB) const;
MachineBasicBlock *emitEHSjLjLongJmp(MachineInstr *MI,
MachineBasicBlock *MBB) const;
ConstraintType
getConstraintType(const std::string &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 std::string &Constraint,
MVT VT) const override;
/// getByValTypeAlignment - Return the desired alignment for ByVal aggregate
/// function arguments in the caller parameter area. This is the actual
/// alignment, not its logarithm.
unsigned getByValTypeAlignment(Type *Ty) const override;
/// LowerAsmOperandForConstraint - Lower the specified operand into the Ops
/// vector. If it is invalid, don't add anything to Ops.
void LowerAsmOperandForConstraint(SDValue Op,
std::string &Constraint,
std::vector<SDValue> &Ops,
SelectionDAG &DAG) 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 AddrMode &AM, Type *Ty) const override;
/// 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;
/// isTruncateFree - Return true if it's free to truncate a value of
/// type Ty1 to type Ty2. e.g. On PPC it's free to truncate a i64 value in
/// register X1 to i32 by referencing its sub-register R1.
bool isTruncateFree(Type *Ty1, Type *Ty2) const override;
bool isTruncateFree(EVT VT1, EVT VT2) const override;
bool isZExtFree(SDValue Val, EVT VT2) const override;
bool isFPExtFree(EVT VT) const override;
/// \brief 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;
bool isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const override;
bool getTgtMemIntrinsic(IntrinsicInfo &Info,
const CallInst &I,
unsigned Intrinsic) const override;
/// getOptimalMemOpType - Returns the target specific optimal type for load
/// and store operations as a result of memset, memcpy, and memmove
/// lowering. If DstAlign is zero that means it's safe to destination
/// alignment can satisfy any constraint. Similarly if SrcAlign is zero it
/// means there isn't a need to check it against alignment requirement,
/// probably because the source does not need to be loaded. If 'IsMemset' is
/// true, that means it's expanding a memset. If 'ZeroMemset' is true, that
/// means it's a memset of zero. 'MemcpyStrSrc' indicates whether the memcpy
/// source is constant so it does not need to be loaded.
/// It returns EVT::Other if the type should be determined using generic
/// target-independent logic.
EVT
getOptimalMemOpType(uint64_t Size, unsigned DstAlign, unsigned SrcAlign,
bool IsMemset, bool ZeroMemset, bool MemcpyStrSrc,
MachineFunction &MF) const override;
/// Is unaligned memory access allowed for the given type, and is it fast
/// relative to software emulation.
bool allowsMisalignedMemoryAccesses(EVT VT,
unsigned AddrSpace,
unsigned Align = 1,
bool *Fast = nullptr) const override;
/// isFMAFasterThanFMulAndFAdd - Return true if an FMA operation is faster
/// than a pair of fmul and fadd instructions. fmuladd intrinsics will be
/// expanded to FMAs when this method returns true, otherwise fmuladd is
/// expanded to fmul + fadd.
bool isFMAFasterThanFMulAndFAdd(EVT VT) const override;
const MCPhysReg *getScratchRegisters(CallingConv::ID CC) const override;
// Should we expand the build vector with shuffles?
bool
shouldExpandBuildVectorWithShuffles(EVT VT,
unsigned DefinedValues) const override;
/// createFastISel - This method returns a target-specific FastISel object,
/// or null if the target does not support "fast" instruction selection.
FastISel *createFastISel(FunctionLoweringInfo &FuncInfo,
const TargetLibraryInfo *LibInfo) const override;
/// \brief 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 override {
// We support any array type as "consecutive" block in the parameter
// save area. The element type defines the alignment requirement and
// whether the argument should go in GPRs, FPRs, or VRs if available.
//
// Note that clang uses this capability both to implement the ELFv2
// homogeneous float/vector aggregate ABI, and to avoid having to use
// "byval" when passing aggregates that might fully fit in registers.
return Ty->isArrayTy();
}
private:
struct ReuseLoadInfo {
SDValue Ptr;
SDValue Chain;
SDValue ResChain;
MachinePointerInfo MPI;
bool IsInvariant;
unsigned Alignment;
AAMDNodes AAInfo;
const MDNode *Ranges;
ReuseLoadInfo() : IsInvariant(false), Alignment(0), Ranges(nullptr) {}
};
bool canReuseLoadAddress(SDValue Op, EVT MemVT, ReuseLoadInfo &RLI,
SelectionDAG &DAG,
ISD::LoadExtType ET = ISD::NON_EXTLOAD) const;
void spliceIntoChain(SDValue ResChain, SDValue NewResChain,
SelectionDAG &DAG) const;
void LowerFP_TO_INTForReuse(SDValue Op, ReuseLoadInfo &RLI,
SelectionDAG &DAG, SDLoc dl) const;
SDValue getFramePointerFrameIndex(SelectionDAG & DAG) const;
SDValue getReturnAddrFrameIndex(SelectionDAG & DAG) const;
bool
IsEligibleForTailCallOptimization(SDValue Callee,
CallingConv::ID CalleeCC,
bool isVarArg,
const SmallVectorImpl<ISD::InputArg> &Ins,
SelectionDAG& DAG) const;
SDValue EmitTailCallLoadFPAndRetAddr(SelectionDAG & DAG,
int SPDiff,
SDValue Chain,
SDValue &LROpOut,
SDValue &FPOpOut,
bool isDarwinABI,
SDLoc dl) const;
SDValue LowerRETURNADDR(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerConstantPool(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerBlockAddress(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerJumpTable(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerSETCC(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerINIT_TRAMPOLINE(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerADJUST_TRAMPOLINE(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerVASTART(SDValue Op, SelectionDAG &DAG,
const PPCSubtarget &Subtarget) const;
SDValue LowerVAARG(SDValue Op, SelectionDAG &DAG,
const PPCSubtarget &Subtarget) const;
SDValue LowerVACOPY(SDValue Op, SelectionDAG &DAG,
const PPCSubtarget &Subtarget) const;
SDValue LowerSTACKRESTORE(SDValue Op, SelectionDAG &DAG,
const PPCSubtarget &Subtarget) const;
SDValue LowerDYNAMIC_STACKALLOC(SDValue Op, SelectionDAG &DAG,
const PPCSubtarget &Subtarget) const;
SDValue LowerLOAD(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerSTORE(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerTRUNCATE(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerFP_TO_INT(SDValue Op, SelectionDAG &DAG, SDLoc dl) const;
SDValue LowerINT_TO_FP(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerFLT_ROUNDS_(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerSHL_PARTS(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerSRL_PARTS(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerSRA_PARTS(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerBUILD_VECTOR(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerVECTOR_SHUFFLE(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerINTRINSIC_WO_CHAIN(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerSCALAR_TO_VECTOR(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerSIGN_EXTEND_INREG(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerMUL(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerCallResult(SDValue Chain, SDValue InFlag,
CallingConv::ID CallConv, bool isVarArg,
const SmallVectorImpl<ISD::InputArg> &Ins,
SDLoc dl, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals) const;
SDValue FinishCall(CallingConv::ID CallConv, SDLoc dl, bool isTailCall,
bool isVarArg, bool IsPatchPoint,
SelectionDAG &DAG,
SmallVector<std::pair<unsigned, SDValue>, 8>
&RegsToPass,
SDValue InFlag, SDValue Chain, SDValue CallSeqStart,
SDValue &Callee,
int SPDiff, unsigned NumBytes,
const SmallVectorImpl<ISD::InputArg> &Ins,
SmallVectorImpl<SDValue> &InVals,
ImmutableCallSite *CS) const;
SDValue
LowerFormalArguments(SDValue Chain,
CallingConv::ID CallConv, bool isVarArg,
const SmallVectorImpl<ISD::InputArg> &Ins,
SDLoc dl, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals) const override;
SDValue
LowerCall(TargetLowering::CallLoweringInfo &CLI,
SmallVectorImpl<SDValue> &InVals) const override;
bool
CanLowerReturn(CallingConv::ID CallConv, MachineFunction &MF,
bool isVarArg,
const SmallVectorImpl<ISD::OutputArg> &Outs,
LLVMContext &Context) const override;
SDValue
LowerReturn(SDValue Chain,
CallingConv::ID CallConv, bool isVarArg,
const SmallVectorImpl<ISD::OutputArg> &Outs,
const SmallVectorImpl<SDValue> &OutVals,
SDLoc dl, SelectionDAG &DAG) const override;
SDValue
extendArgForPPC64(ISD::ArgFlagsTy Flags, EVT ObjectVT, SelectionDAG &DAG,
SDValue ArgVal, SDLoc dl) const;
SDValue
LowerFormalArguments_Darwin(SDValue Chain,
CallingConv::ID CallConv, bool isVarArg,
const SmallVectorImpl<ISD::InputArg> &Ins,
SDLoc dl, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals) const;
SDValue
LowerFormalArguments_64SVR4(SDValue Chain,
CallingConv::ID CallConv, bool isVarArg,
const SmallVectorImpl<ISD::InputArg> &Ins,
SDLoc dl, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals) const;
SDValue
LowerFormalArguments_32SVR4(SDValue Chain,
CallingConv::ID CallConv, bool isVarArg,
const SmallVectorImpl<ISD::InputArg> &Ins,
SDLoc dl, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals) const;
SDValue
createMemcpyOutsideCallSeq(SDValue Arg, SDValue PtrOff,
SDValue CallSeqStart, ISD::ArgFlagsTy Flags,
SelectionDAG &DAG, SDLoc dl) const;
SDValue
LowerCall_Darwin(SDValue Chain, SDValue Callee,
CallingConv::ID CallConv,
bool isVarArg, bool isTailCall, bool IsPatchPoint,
const SmallVectorImpl<ISD::OutputArg> &Outs,
const SmallVectorImpl<SDValue> &OutVals,
const SmallVectorImpl<ISD::InputArg> &Ins,
SDLoc dl, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals,
ImmutableCallSite *CS) const;
SDValue
LowerCall_64SVR4(SDValue Chain, SDValue Callee,
CallingConv::ID CallConv,
bool isVarArg, bool isTailCall, bool IsPatchPoint,
const SmallVectorImpl<ISD::OutputArg> &Outs,
const SmallVectorImpl<SDValue> &OutVals,
const SmallVectorImpl<ISD::InputArg> &Ins,
SDLoc dl, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals,
ImmutableCallSite *CS) const;
SDValue
LowerCall_32SVR4(SDValue Chain, SDValue Callee, CallingConv::ID CallConv,
bool isVarArg, bool isTailCall, bool IsPatchPoint,
const SmallVectorImpl<ISD::OutputArg> &Outs,
const SmallVectorImpl<SDValue> &OutVals,
const SmallVectorImpl<ISD::InputArg> &Ins,
SDLoc dl, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals,
ImmutableCallSite *CS) const;
SDValue lowerEH_SJLJ_SETJMP(SDValue Op, SelectionDAG &DAG) const;
SDValue lowerEH_SJLJ_LONGJMP(SDValue Op, SelectionDAG &DAG) const;
SDValue DAGCombineExtBoolTrunc(SDNode *N, DAGCombinerInfo &DCI) const;
SDValue DAGCombineTruncBoolExt(SDNode *N, DAGCombinerInfo &DCI) const;
SDValue combineFPToIntToFP(SDNode *N, DAGCombinerInfo &DCI) const;
SDValue getRsqrtEstimate(SDValue Operand, DAGCombinerInfo &DCI,
unsigned &RefinementSteps,
bool &UseOneConstNR) const override;
SDValue getRecipEstimate(SDValue Operand, DAGCombinerInfo &DCI,
unsigned &RefinementSteps) const override;
bool combineRepeatedFPDivisors(unsigned NumUsers) const override;
CCAssignFn *useFastISelCCs(unsigned Flag) const;
};
namespace PPC {
FastISel *createFastISel(FunctionLoweringInfo &FuncInfo,
const TargetLibraryInfo *LibInfo);
}
bool CC_PPC32_SVR4_Custom_Dummy(unsigned &ValNo, MVT &ValVT, MVT &LocVT,
CCValAssign::LocInfo &LocInfo,
ISD::ArgFlagsTy &ArgFlags,
CCState &State);
bool CC_PPC32_SVR4_Custom_AlignArgRegs(unsigned &ValNo, MVT &ValVT,
MVT &LocVT,
CCValAssign::LocInfo &LocInfo,
ISD::ArgFlagsTy &ArgFlags,
CCState &State);
bool CC_PPC32_SVR4_Custom_AlignFPArgRegs(unsigned &ValNo, MVT &ValVT,
MVT &LocVT,
CCValAssign::LocInfo &LocInfo,
ISD::ArgFlagsTy &ArgFlags,
CCState &State);
}
#endif // LLVM_TARGET_POWERPC_PPC32ISELLOWERING_H
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