| //===-- SystemZISelLowering.h - SystemZ 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 SystemZ uses to lower LLVM code into a |
| // selection DAG. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_TARGET_SystemZ_ISELLOWERING_H |
| #define LLVM_TARGET_SystemZ_ISELLOWERING_H |
| |
| #include "SystemZ.h" |
| #include "llvm/CodeGen/MachineBasicBlock.h" |
| #include "llvm/CodeGen/SelectionDAG.h" |
| #include "llvm/Target/TargetLowering.h" |
| |
| namespace llvm { |
| namespace SystemZISD { |
| enum { |
| FIRST_NUMBER = ISD::BUILTIN_OP_END, |
| |
| // Return with a flag operand. Operand 0 is the chain operand. |
| RET_FLAG, |
| |
| // Calls a function. Operand 0 is the chain operand and operand 1 |
| // is the target address. The arguments start at operand 2. |
| // There is an optional glue operand at the end. |
| CALL, |
| SIBCALL, |
| |
| // Wraps a TargetGlobalAddress that should be loaded using PC-relative |
| // accesses (LARL). Operand 0 is the address. |
| PCREL_WRAPPER, |
| |
| // Used in cases where an offset is applied to a TargetGlobalAddress. |
| // Operand 0 is the full TargetGlobalAddress and operand 1 is a |
| // PCREL_WRAPPER for an anchor point. This is used so that we can |
| // cheaply refer to either the full address or the anchor point |
| // as a register base. |
| PCREL_OFFSET, |
| |
| // Integer absolute. |
| IABS, |
| |
| // Integer comparisons. There are three operands: the two values |
| // to compare, and an integer of type SystemZICMP. |
| ICMP, |
| |
| // Floating-point comparisons. The two operands are the values to compare. |
| FCMP, |
| |
| // Test under mask. The first operand is ANDed with the second operand |
| // and the condition codes are set on the result. The third operand is |
| // a boolean that is true if the condition codes need to distinguish |
| // between CCMASK_TM_MIXED_MSB_0 and CCMASK_TM_MIXED_MSB_1 (which the |
| // register forms do but the memory forms don't). |
| TM, |
| |
| // Branches if a condition is true. Operand 0 is the chain operand; |
| // operand 1 is the 4-bit condition-code mask, with bit N in |
| // big-endian order meaning "branch if CC=N"; operand 2 is the |
| // target block and operand 3 is the flag operand. |
| BR_CCMASK, |
| |
| // Selects between operand 0 and operand 1. Operand 2 is the |
| // mask of condition-code values for which operand 0 should be |
| // chosen over operand 1; it has the same form as BR_CCMASK. |
| // Operand 3 is the flag operand. |
| SELECT_CCMASK, |
| |
| // Evaluates to the gap between the stack pointer and the |
| // base of the dynamically-allocatable area. |
| ADJDYNALLOC, |
| |
| // Extracts the value of a 32-bit access register. Operand 0 is |
| // the number of the register. |
| EXTRACT_ACCESS, |
| |
| // Wrappers around the ISD opcodes of the same name. The output and |
| // first input operands are GR128s. The trailing numbers are the |
| // widths of the second operand in bits. |
| UMUL_LOHI64, |
| SDIVREM32, |
| SDIVREM64, |
| UDIVREM32, |
| UDIVREM64, |
| |
| // Use a series of MVCs to copy bytes from one memory location to another. |
| // The operands are: |
| // - the target address |
| // - the source address |
| // - the constant length |
| // |
| // This isn't a memory opcode because we'd need to attach two |
| // MachineMemOperands rather than one. |
| MVC, |
| |
| // Like MVC, but implemented as a loop that handles X*256 bytes |
| // followed by straight-line code to handle the rest (if any). |
| // The value of X is passed as an additional operand. |
| MVC_LOOP, |
| |
| // Similar to MVC and MVC_LOOP, but for logic operations (AND, OR, XOR). |
| NC, |
| NC_LOOP, |
| OC, |
| OC_LOOP, |
| XC, |
| XC_LOOP, |
| |
| // Use CLC to compare two blocks of memory, with the same comments |
| // as for MVC and MVC_LOOP. |
| CLC, |
| CLC_LOOP, |
| |
| // Use an MVST-based sequence to implement stpcpy(). |
| STPCPY, |
| |
| // Use a CLST-based sequence to implement strcmp(). The two input operands |
| // are the addresses of the strings to compare. |
| STRCMP, |
| |
| // Use an SRST-based sequence to search a block of memory. The first |
| // operand is the end address, the second is the start, and the third |
| // is the character to search for. CC is set to 1 on success and 2 |
| // on failure. |
| SEARCH_STRING, |
| |
| // Store the CC value in bits 29 and 28 of an integer. |
| IPM, |
| |
| // Perform a serialization operation. (BCR 15,0 or BCR 14,0.) |
| SERIALIZE, |
| |
| // Wrappers around the inner loop of an 8- or 16-bit ATOMIC_SWAP or |
| // ATOMIC_LOAD_<op>. |
| // |
| // Operand 0: the address of the containing 32-bit-aligned field |
| // Operand 1: the second operand of <op>, in the high bits of an i32 |
| // for everything except ATOMIC_SWAPW |
| // Operand 2: how many bits to rotate the i32 left to bring the first |
| // operand into the high bits |
| // Operand 3: the negative of operand 2, for rotating the other way |
| // Operand 4: the width of the field in bits (8 or 16) |
| ATOMIC_SWAPW = ISD::FIRST_TARGET_MEMORY_OPCODE, |
| ATOMIC_LOADW_ADD, |
| ATOMIC_LOADW_SUB, |
| ATOMIC_LOADW_AND, |
| ATOMIC_LOADW_OR, |
| ATOMIC_LOADW_XOR, |
| ATOMIC_LOADW_NAND, |
| ATOMIC_LOADW_MIN, |
| ATOMIC_LOADW_MAX, |
| ATOMIC_LOADW_UMIN, |
| ATOMIC_LOADW_UMAX, |
| |
| // A wrapper around the inner loop of an ATOMIC_CMP_SWAP. |
| // |
| // Operand 0: the address of the containing 32-bit-aligned field |
| // Operand 1: the compare value, in the low bits of an i32 |
| // Operand 2: the swap value, in the low bits of an i32 |
| // Operand 3: how many bits to rotate the i32 left to bring the first |
| // operand into the high bits |
| // Operand 4: the negative of operand 2, for rotating the other way |
| // Operand 5: the width of the field in bits (8 or 16) |
| ATOMIC_CMP_SWAPW, |
| |
| // Prefetch from the second operand using the 4-bit control code in |
| // the first operand. The code is 1 for a load prefetch and 2 for |
| // a store prefetch. |
| PREFETCH |
| }; |
| |
| // Return true if OPCODE is some kind of PC-relative address. |
| inline bool isPCREL(unsigned Opcode) { |
| return Opcode == PCREL_WRAPPER || Opcode == PCREL_OFFSET; |
| } |
| } // end namespace SystemZISD |
| |
| namespace SystemZICMP { |
| // Describes whether an integer comparison needs to be signed or unsigned, |
| // or whether either type is OK. |
| enum { |
| Any, |
| UnsignedOnly, |
| SignedOnly |
| }; |
| } // end namespace SystemZICMP |
| |
| class SystemZSubtarget; |
| class SystemZTargetMachine; |
| |
| class SystemZTargetLowering : public TargetLowering { |
| public: |
| explicit SystemZTargetLowering(const TargetMachine &TM); |
| |
| // Override TargetLowering. |
| MVT getScalarShiftAmountTy(EVT LHSTy) const override { |
| return MVT::i32; |
| } |
| EVT getSetCCResultType(LLVMContext &, EVT) const override; |
| bool isFMAFasterThanFMulAndFAdd(EVT VT) const override; |
| bool isFPImmLegal(const APFloat &Imm, EVT VT) const override; |
| bool isLegalAddressingMode(const AddrMode &AM, Type *Ty) const override; |
| bool allowsUnalignedMemoryAccesses(EVT VT, unsigned AS, |
| bool *Fast) const override; |
| bool isTruncateFree(Type *, Type *) const override; |
| bool isTruncateFree(EVT, EVT) const override; |
| const char *getTargetNodeName(unsigned Opcode) const override; |
| std::pair<unsigned, const TargetRegisterClass *> |
| getRegForInlineAsmConstraint(const std::string &Constraint, |
| MVT VT) const override; |
| TargetLowering::ConstraintType |
| getConstraintType(const std::string &Constraint) const override; |
| TargetLowering::ConstraintWeight |
| getSingleConstraintMatchWeight(AsmOperandInfo &info, |
| const char *constraint) const override; |
| void LowerAsmOperandForConstraint(SDValue Op, |
| std::string &Constraint, |
| std::vector<SDValue> &Ops, |
| SelectionDAG &DAG) const override; |
| MachineBasicBlock *EmitInstrWithCustomInserter(MachineInstr *MI, |
| MachineBasicBlock *BB) const |
| override; |
| SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const override; |
| bool allowTruncateForTailCall(Type *, Type *) const override; |
| bool mayBeEmittedAsTailCall(CallInst *CI) const override; |
| 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(CallLoweringInfo &CLI, |
| SmallVectorImpl<SDValue> &InVals) 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 prepareVolatileOrAtomicLoad(SDValue Chain, SDLoc DL, |
| SelectionDAG &DAG) const override; |
| SDValue PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const override; |
| |
| private: |
| const SystemZSubtarget &Subtarget; |
| |
| // Implement LowerOperation for individual opcodes. |
| SDValue lowerSETCC(SDValue Op, SelectionDAG &DAG) const; |
| SDValue lowerBR_CC(SDValue Op, SelectionDAG &DAG) const; |
| SDValue lowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const; |
| SDValue lowerGlobalAddress(GlobalAddressSDNode *Node, |
| SelectionDAG &DAG) const; |
| SDValue lowerGlobalTLSAddress(GlobalAddressSDNode *Node, |
| SelectionDAG &DAG) const; |
| SDValue lowerBlockAddress(BlockAddressSDNode *Node, |
| SelectionDAG &DAG) const; |
| SDValue lowerJumpTable(JumpTableSDNode *JT, SelectionDAG &DAG) const; |
| SDValue lowerConstantPool(ConstantPoolSDNode *CP, SelectionDAG &DAG) const; |
| SDValue lowerVASTART(SDValue Op, SelectionDAG &DAG) const; |
| SDValue lowerVACOPY(SDValue Op, SelectionDAG &DAG) const; |
| SDValue lowerDYNAMIC_STACKALLOC(SDValue Op, SelectionDAG &DAG) const; |
| SDValue lowerSMUL_LOHI(SDValue Op, SelectionDAG &DAG) const; |
| SDValue lowerUMUL_LOHI(SDValue Op, SelectionDAG &DAG) const; |
| SDValue lowerSDIVREM(SDValue Op, SelectionDAG &DAG) const; |
| SDValue lowerUDIVREM(SDValue Op, SelectionDAG &DAG) const; |
| SDValue lowerBITCAST(SDValue Op, SelectionDAG &DAG) const; |
| SDValue lowerOR(SDValue Op, SelectionDAG &DAG) const; |
| SDValue lowerATOMIC_LOAD(SDValue Op, SelectionDAG &DAG) const; |
| SDValue lowerATOMIC_STORE(SDValue Op, SelectionDAG &DAG) const; |
| SDValue lowerATOMIC_LOAD_OP(SDValue Op, SelectionDAG &DAG, |
| unsigned Opcode) const; |
| SDValue lowerATOMIC_LOAD_SUB(SDValue Op, SelectionDAG &DAG) const; |
| SDValue lowerATOMIC_CMP_SWAP(SDValue Op, SelectionDAG &DAG) const; |
| SDValue lowerLOAD_SEQUENCE_POINT(SDValue Op, SelectionDAG &DAG) const; |
| SDValue lowerSTACKSAVE(SDValue Op, SelectionDAG &DAG) const; |
| SDValue lowerSTACKRESTORE(SDValue Op, SelectionDAG &DAG) const; |
| SDValue lowerPREFETCH(SDValue Op, SelectionDAG &DAG) const; |
| |
| // If the last instruction before MBBI in MBB was some form of COMPARE, |
| // try to replace it with a COMPARE AND BRANCH just before MBBI. |
| // CCMask and Target are the BRC-like operands for the branch. |
| // Return true if the change was made. |
| bool convertPrevCompareToBranch(MachineBasicBlock *MBB, |
| MachineBasicBlock::iterator MBBI, |
| unsigned CCMask, |
| MachineBasicBlock *Target) const; |
| |
| // Implement EmitInstrWithCustomInserter for individual operation types. |
| MachineBasicBlock *emitSelect(MachineInstr *MI, |
| MachineBasicBlock *BB) const; |
| MachineBasicBlock *emitCondStore(MachineInstr *MI, |
| MachineBasicBlock *BB, |
| unsigned StoreOpcode, unsigned STOCOpcode, |
| bool Invert) const; |
| MachineBasicBlock *emitExt128(MachineInstr *MI, |
| MachineBasicBlock *MBB, |
| bool ClearEven, unsigned SubReg) const; |
| MachineBasicBlock *emitAtomicLoadBinary(MachineInstr *MI, |
| MachineBasicBlock *BB, |
| unsigned BinOpcode, unsigned BitSize, |
| bool Invert = false) const; |
| MachineBasicBlock *emitAtomicLoadMinMax(MachineInstr *MI, |
| MachineBasicBlock *MBB, |
| unsigned CompareOpcode, |
| unsigned KeepOldMask, |
| unsigned BitSize) const; |
| MachineBasicBlock *emitAtomicCmpSwapW(MachineInstr *MI, |
| MachineBasicBlock *BB) const; |
| MachineBasicBlock *emitMemMemWrapper(MachineInstr *MI, |
| MachineBasicBlock *BB, |
| unsigned Opcode) const; |
| MachineBasicBlock *emitStringWrapper(MachineInstr *MI, |
| MachineBasicBlock *BB, |
| unsigned Opcode) const; |
| }; |
| } // end namespace llvm |
| |
| #endif // LLVM_TARGET_SystemZ_ISELLOWERING_H |
