-//==-- SystemZISelLowering.h - SystemZ DAG Lowering Interface ----*- C++ -*-==//
+//===-- SystemZISelLowering.h - SystemZ DAG lowering interface --*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
#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,
+namespace SystemZISD {
+ enum {
+ FIRST_NUMBER = ISD::BUILTIN_OP_END,
- /// Return with a flag operand. Operand 0 is the chain operand.
- RET_FLAG,
+ // Return with a flag operand. Operand 0 is the chain operand.
+ RET_FLAG,
- /// CALL/TAILCALL - These operations represent an abstract call
- /// instruction, which includes a bunch of information.
- CALL
- };
- }
+ // 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,
+
+ // Wraps a TargetGlobalAddress that should be loaded using PC-relative
+ // accesses (LARL). Operand 0 is the address.
+ PCREL_WRAPPER,
+
+ // Signed integer and floating-point comparisons. The operands are the
+ // two values to compare.
+ CMP,
+
+ // Likewise unsigned integer comparison.
+ UCMP,
- class SystemZSubtarget;
- class SystemZTargetMachine;
+ // 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,
- class SystemZTargetLowering : public TargetLowering {
- public:
- explicit SystemZTargetLowering(SystemZTargetMachine &TM);
+ // 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,
- /// LowerOperation - Provide custom lowering hooks for some operations.
- virtual SDValue LowerOperation(SDValue Op, SelectionDAG &DAG);
+ // Evaluates to the gap between the stack pointer and the
+ // base of the dynamically-allocatable area.
+ ADJDYNALLOC,
- /// getTargetNodeName - This method returns the name of a target specific
- /// DAG node.
- virtual const char *getTargetNodeName(unsigned Opcode) const;
+ // Extracts the value of a 32-bit access register. Operand 0 is
+ // the number of the register.
+ EXTRACT_ACCESS,
- SDValue LowerFORMAL_ARGUMENTS(SDValue Op, SelectionDAG &DAG);
- SDValue LowerRET(SDValue Op, SelectionDAG &DAG);
- SDValue LowerCALL(SDValue Op, SelectionDAG &DAG);
+ // 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,
- SDValue LowerCCCArguments(SDValue Op, SelectionDAG &DAG);
- SDValue LowerCCCCallTo(SDValue Op, SelectionDAG &DAG, unsigned CC);
+ // Use MVC to copy bytes from one memory location to another.
+ // The first operand is the target address, the second operand is the
+ // source address, and the third operand is the constant length.
+ // This isn't a memory opcode because we'd need to attach two
+ // MachineMemOperands rather than one.
+ MVC,
- SDNode* LowerCallResult(SDValue Chain, SDValue InFlag,
- CallSDNode *TheCall,
- unsigned CallingConv, SelectionDAG &DAG);
+ // Use CLC to compare two blocks of memory, with the same comments
+ // as for MVC.
+ CLC,
- private:
- const SystemZSubtarget &Subtarget;
- const SystemZTargetMachine &TM;
+ // Store the CC value in bits 29 and 28 of an integer.
+ IPM,
+
+ // 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
};
-} // namespace llvm
+}
+
+class SystemZSubtarget;
+class SystemZTargetMachine;
+
+class SystemZTargetLowering : public TargetLowering {
+public:
+ explicit SystemZTargetLowering(SystemZTargetMachine &TM);
+
+ // Override TargetLowering.
+ virtual MVT getScalarShiftAmountTy(EVT LHSTy) const LLVM_OVERRIDE {
+ return MVT::i32;
+ }
+ virtual EVT getSetCCResultType(LLVMContext &, EVT) const LLVM_OVERRIDE {
+ return MVT::i32;
+ }
+ virtual bool isFMAFasterThanFMulAndFAdd(EVT VT) const LLVM_OVERRIDE;
+ virtual bool isFPImmLegal(const APFloat &Imm, EVT VT) const LLVM_OVERRIDE;
+ virtual bool isLegalAddressingMode(const AddrMode &AM, Type *Ty) const
+ LLVM_OVERRIDE;
+ virtual bool allowsUnalignedMemoryAccesses(EVT VT, bool *Fast) const
+ LLVM_OVERRIDE;
+ virtual const char *getTargetNodeName(unsigned Opcode) const LLVM_OVERRIDE;
+ virtual std::pair<unsigned, const TargetRegisterClass *>
+ getRegForInlineAsmConstraint(const std::string &Constraint,
+ MVT VT) const LLVM_OVERRIDE;
+ virtual TargetLowering::ConstraintType
+ getConstraintType(const std::string &Constraint) const LLVM_OVERRIDE;
+ virtual TargetLowering::ConstraintWeight
+ getSingleConstraintMatchWeight(AsmOperandInfo &info,
+ const char *constraint) const LLVM_OVERRIDE;
+ virtual void
+ LowerAsmOperandForConstraint(SDValue Op,
+ std::string &Constraint,
+ std::vector<SDValue> &Ops,
+ SelectionDAG &DAG) const LLVM_OVERRIDE;
+ virtual MachineBasicBlock *
+ EmitInstrWithCustomInserter(MachineInstr *MI,
+ MachineBasicBlock *BB) const LLVM_OVERRIDE;
+ virtual SDValue LowerOperation(SDValue Op,
+ SelectionDAG &DAG) const LLVM_OVERRIDE;
+ virtual SDValue
+ LowerFormalArguments(SDValue Chain,
+ CallingConv::ID CallConv, bool isVarArg,
+ const SmallVectorImpl<ISD::InputArg> &Ins,
+ SDLoc DL, SelectionDAG &DAG,
+ SmallVectorImpl<SDValue> &InVals) const LLVM_OVERRIDE;
+ virtual SDValue
+ LowerCall(CallLoweringInfo &CLI,
+ SmallVectorImpl<SDValue> &InVals) const LLVM_OVERRIDE;
+
+ virtual SDValue
+ LowerReturn(SDValue Chain,
+ CallingConv::ID CallConv, bool IsVarArg,
+ const SmallVectorImpl<ISD::OutputArg> &Outs,
+ const SmallVectorImpl<SDValue> &OutVals,
+ SDLoc DL, SelectionDAG &DAG) const LLVM_OVERRIDE;
+
+private:
+ const SystemZSubtarget &Subtarget;
+ const SystemZTargetMachine &TM;
+
+ // Implement LowerOperation for individual opcodes.
+ 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 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,
+ unsigned Opcode) const;
+ SDValue lowerATOMIC_CMP_SWAP(SDValue Op, SelectionDAG &DAG) const;
+ SDValue lowerSTACKSAVE(SDValue Op, SelectionDAG &DAG) const;
+ SDValue lowerSTACKRESTORE(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;
+};
+} // end namespace llvm
#endif // LLVM_TARGET_SystemZ_ISELLOWERING_H
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