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			621 lines
		
	
	
		
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|   | //===-- 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_LIB_TARGET_SYSTEMZ_SYSTEMZISELLOWERING_H
 | ||
|  | #define LLVM_LIB_TARGET_SYSTEMZ_SYSTEMZISELLOWERING_H
 | ||
|  | 
 | ||
|  | #include "SystemZ.h"
 | ||
|  | #include "llvm/CodeGen/MachineBasicBlock.h"
 | ||
|  | #include "llvm/CodeGen/SelectionDAG.h"
 | ||
|  | #include "llvm/CodeGen/TargetLowering.h"
 | ||
|  | 
 | ||
|  | namespace llvm { | ||
|  | namespace SystemZISD { | ||
|  | enum NodeType : unsigned { | ||
|  |   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, | ||
|  | 
 | ||
|  |   // TLS calls.  Like regular calls, except operand 1 is the TLS symbol.
 | ||
|  |   // (The call target is implicitly __tls_get_offset.)
 | ||
|  |   TLS_GDCALL, | ||
|  |   TLS_LDCALL, | ||
|  | 
 | ||
|  |   // 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, | ||
|  | 
 | ||
|  |   // Count number of bits set in operand 0 per byte.
 | ||
|  |   POPCNT, | ||
|  | 
 | ||
|  |   // Wrappers around the ISD opcodes of the same name.  The output is GR128.
 | ||
|  |   // Input operands may be GR64 or GR32, depending on the instruction.
 | ||
|  |   SMUL_LOHI, | ||
|  |   UMUL_LOHI, | ||
|  |   SDIVREM, | ||
|  |   UDIVREM, | ||
|  | 
 | ||
|  |   // 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, | ||
|  | 
 | ||
|  |   // Compiler barrier only; generate a no-op.
 | ||
|  |   MEMBARRIER, | ||
|  | 
 | ||
|  |   // Transaction begin.  The first operand is the chain, the second
 | ||
|  |   // the TDB pointer, and the third the immediate control field.
 | ||
|  |   // Returns chain and glue.
 | ||
|  |   TBEGIN, | ||
|  |   TBEGIN_NOFLOAT, | ||
|  | 
 | ||
|  |   // Transaction end.  Just the chain operand.  Returns chain and glue.
 | ||
|  |   TEND, | ||
|  | 
 | ||
|  |   // Create a vector constant by filling byte N of the result with bit
 | ||
|  |   // 15-N of the single operand.
 | ||
|  |   BYTE_MASK, | ||
|  | 
 | ||
|  |   // Create a vector constant by replicating an element-sized RISBG-style mask.
 | ||
|  |   // The first operand specifies the starting set bit and the second operand
 | ||
|  |   // specifies the ending set bit.  Both operands count from the MSB of the
 | ||
|  |   // element.
 | ||
|  |   ROTATE_MASK, | ||
|  | 
 | ||
|  |   // Replicate a GPR scalar value into all elements of a vector.
 | ||
|  |   REPLICATE, | ||
|  | 
 | ||
|  |   // Create a vector from two i64 GPRs.
 | ||
|  |   JOIN_DWORDS, | ||
|  | 
 | ||
|  |   // Replicate one element of a vector into all elements.  The first operand
 | ||
|  |   // is the vector and the second is the index of the element to replicate.
 | ||
|  |   SPLAT, | ||
|  | 
 | ||
|  |   // Interleave elements from the high half of operand 0 and the high half
 | ||
|  |   // of operand 1.
 | ||
|  |   MERGE_HIGH, | ||
|  | 
 | ||
|  |   // Likewise for the low halves.
 | ||
|  |   MERGE_LOW, | ||
|  | 
 | ||
|  |   // Concatenate the vectors in the first two operands, shift them left
 | ||
|  |   // by the third operand, and take the first half of the result.
 | ||
|  |   SHL_DOUBLE, | ||
|  | 
 | ||
|  |   // Take one element of the first v2i64 operand and the one element of
 | ||
|  |   // the second v2i64 operand and concatenate them to form a v2i64 result.
 | ||
|  |   // The third operand is a 4-bit value of the form 0A0B, where A and B
 | ||
|  |   // are the element selectors for the first operand and second operands
 | ||
|  |   // respectively.
 | ||
|  |   PERMUTE_DWORDS, | ||
|  | 
 | ||
|  |   // Perform a general vector permute on vector operands 0 and 1.
 | ||
|  |   // Each byte of operand 2 controls the corresponding byte of the result,
 | ||
|  |   // in the same way as a byte-level VECTOR_SHUFFLE mask.
 | ||
|  |   PERMUTE, | ||
|  | 
 | ||
|  |   // Pack vector operands 0 and 1 into a single vector with half-sized elements.
 | ||
|  |   PACK, | ||
|  | 
 | ||
|  |   // Likewise, but saturate the result and set CC.  PACKS_CC does signed
 | ||
|  |   // saturation and PACKLS_CC does unsigned saturation.
 | ||
|  |   PACKS_CC, | ||
|  |   PACKLS_CC, | ||
|  | 
 | ||
|  |   // Unpack the first half of vector operand 0 into double-sized elements.
 | ||
|  |   // UNPACK_HIGH sign-extends and UNPACKL_HIGH zero-extends.
 | ||
|  |   UNPACK_HIGH, | ||
|  |   UNPACKL_HIGH, | ||
|  | 
 | ||
|  |   // Likewise for the second half.
 | ||
|  |   UNPACK_LOW, | ||
|  |   UNPACKL_LOW, | ||
|  | 
 | ||
|  |   // Shift each element of vector operand 0 by the number of bits specified
 | ||
|  |   // by scalar operand 1.
 | ||
|  |   VSHL_BY_SCALAR, | ||
|  |   VSRL_BY_SCALAR, | ||
|  |   VSRA_BY_SCALAR, | ||
|  | 
 | ||
|  |   // For each element of the output type, sum across all sub-elements of
 | ||
|  |   // operand 0 belonging to the corresponding element, and add in the
 | ||
|  |   // rightmost sub-element of the corresponding element of operand 1.
 | ||
|  |   VSUM, | ||
|  | 
 | ||
|  |   // Compare integer vector operands 0 and 1 to produce the usual 0/-1
 | ||
|  |   // vector result.  VICMPE is for equality, VICMPH for "signed greater than"
 | ||
|  |   // and VICMPHL for "unsigned greater than".
 | ||
|  |   VICMPE, | ||
|  |   VICMPH, | ||
|  |   VICMPHL, | ||
|  | 
 | ||
|  |   // Likewise, but also set the condition codes on the result.
 | ||
|  |   VICMPES, | ||
|  |   VICMPHS, | ||
|  |   VICMPHLS, | ||
|  | 
 | ||
|  |   // Compare floating-point vector operands 0 and 1 to preoduce the usual 0/-1
 | ||
|  |   // vector result.  VFCMPE is for "ordered and equal", VFCMPH for "ordered and
 | ||
|  |   // greater than" and VFCMPHE for "ordered and greater than or equal to".
 | ||
|  |   VFCMPE, | ||
|  |   VFCMPH, | ||
|  |   VFCMPHE, | ||
|  | 
 | ||
|  |   // Likewise, but also set the condition codes on the result.
 | ||
|  |   VFCMPES, | ||
|  |   VFCMPHS, | ||
|  |   VFCMPHES, | ||
|  | 
 | ||
|  |   // Test floating-point data class for vectors.
 | ||
|  |   VFTCI, | ||
|  | 
 | ||
|  |   // Extend the even f32 elements of vector operand 0 to produce a vector
 | ||
|  |   // of f64 elements.
 | ||
|  |   VEXTEND, | ||
|  | 
 | ||
|  |   // Round the f64 elements of vector operand 0 to f32s and store them in the
 | ||
|  |   // even elements of the result.
 | ||
|  |   VROUND, | ||
|  | 
 | ||
|  |   // AND the two vector operands together and set CC based on the result.
 | ||
|  |   VTM, | ||
|  | 
 | ||
|  |   // String operations that set CC as a side-effect.
 | ||
|  |   VFAE_CC, | ||
|  |   VFAEZ_CC, | ||
|  |   VFEE_CC, | ||
|  |   VFEEZ_CC, | ||
|  |   VFENE_CC, | ||
|  |   VFENEZ_CC, | ||
|  |   VISTR_CC, | ||
|  |   VSTRC_CC, | ||
|  |   VSTRCZ_CC, | ||
|  | 
 | ||
|  |   // Test Data Class.
 | ||
|  |   //
 | ||
|  |   // Operand 0: the value to test
 | ||
|  |   // Operand 1: the bit mask
 | ||
|  |   TDC, | ||
|  | 
 | ||
|  |   // 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, | ||
|  | 
 | ||
|  |   // Atomic compare-and-swap returning glue (condition code).
 | ||
|  |   // Val, OUTCHAIN, glue = ATOMIC_CMP_SWAP(INCHAIN, ptr, cmp, swap)
 | ||
|  |   ATOMIC_CMP_SWAP, | ||
|  | 
 | ||
|  |   // 128-bit atomic load.
 | ||
|  |   // Val, OUTCHAIN = ATOMIC_LOAD_128(INCHAIN, ptr)
 | ||
|  |   ATOMIC_LOAD_128, | ||
|  | 
 | ||
|  |   // 128-bit atomic store.
 | ||
|  |   // OUTCHAIN = ATOMIC_STORE_128(INCHAIN, val, ptr)
 | ||
|  |   ATOMIC_STORE_128, | ||
|  | 
 | ||
|  |   // 128-bit atomic compare-and-swap.
 | ||
|  |   // Val, OUTCHAIN, glue = ATOMIC_CMP_SWAP(INCHAIN, ptr, cmp, swap)
 | ||
|  |   ATOMIC_CMP_SWAP_128, | ||
|  | 
 | ||
|  |   // Byte swapping load.
 | ||
|  |   //
 | ||
|  |   // Operand 0: the address to load from
 | ||
|  |   // Operand 1: the type of load (i16, i32, i64)
 | ||
|  |   LRV, | ||
|  | 
 | ||
|  |   // Byte swapping store.
 | ||
|  |   //
 | ||
|  |   // Operand 0: the value to store
 | ||
|  |   // Operand 1: the address to store to
 | ||
|  |   // Operand 2: the type of store (i16, i32, i64)
 | ||
|  |   STRV, | ||
|  | 
 | ||
|  |   // 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, | ||
|  |                                  const SystemZSubtarget &STI); | ||
|  | 
 | ||
|  |   // Override TargetLowering.
 | ||
|  |   MVT getScalarShiftAmountTy(const DataLayout &, EVT) const override { | ||
|  |     return MVT::i32; | ||
|  |   } | ||
|  |   MVT getVectorIdxTy(const DataLayout &DL) const override { | ||
|  |     // Only the lower 12 bits of an element index are used, so we don't
 | ||
|  |     // want to clobber the upper 32 bits of a GPR unnecessarily.
 | ||
|  |     return MVT::i32; | ||
|  |   } | ||
|  |   TargetLoweringBase::LegalizeTypeAction getPreferredVectorAction(EVT VT) | ||
|  |     const override { | ||
|  |     // Widen subvectors to the full width rather than promoting integer
 | ||
|  |     // elements.  This is better because:
 | ||
|  |     //
 | ||
|  |     // (a) it means that we can handle the ABI for passing and returning
 | ||
|  |     //     sub-128 vectors without having to handle them as legal types.
 | ||
|  |     //
 | ||
|  |     // (b) we don't have instructions to extend on load and truncate on store,
 | ||
|  |     //     so promoting the integers is less efficient.
 | ||
|  |     //
 | ||
|  |     // (c) there are no multiplication instructions for the widest integer
 | ||
|  |     //     type (v2i64).
 | ||
|  |     if (VT.getScalarSizeInBits() % 8 == 0) | ||
|  |       return TypeWidenVector; | ||
|  |     return TargetLoweringBase::getPreferredVectorAction(VT); | ||
|  |   } | ||
|  |   EVT getSetCCResultType(const DataLayout &DL, LLVMContext &, | ||
|  |                          EVT) const override; | ||
|  |   bool isFMAFasterThanFMulAndFAdd(EVT VT) const override; | ||
|  |   bool isFPImmLegal(const APFloat &Imm, EVT VT) const override; | ||
|  |   bool isLegalICmpImmediate(int64_t Imm) const override; | ||
|  |   bool isLegalAddImmediate(int64_t Imm) const override; | ||
|  |   bool isLegalAddressingMode(const DataLayout &DL, const AddrMode &AM, Type *Ty, | ||
|  |                              unsigned AS, | ||
|  |                              Instruction *I = nullptr) const override; | ||
|  |   bool allowsMisalignedMemoryAccesses(EVT VT, unsigned AS, | ||
|  |                                       unsigned Align, | ||
|  |                                       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 TargetRegisterInfo *TRI, | ||
|  |                                StringRef Constraint, MVT VT) const override; | ||
|  |   TargetLowering::ConstraintType | ||
|  |   getConstraintType(StringRef 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; | ||
|  | 
 | ||
|  |   unsigned getInlineAsmMemConstraint(StringRef ConstraintCode) const override { | ||
|  |     if (ConstraintCode.size() == 1) { | ||
|  |       switch(ConstraintCode[0]) { | ||
|  |       default: | ||
|  |         break; | ||
|  |       case 'o': | ||
|  |         return InlineAsm::Constraint_o; | ||
|  |       case 'Q': | ||
|  |         return InlineAsm::Constraint_Q; | ||
|  |       case 'R': | ||
|  |         return InlineAsm::Constraint_R; | ||
|  |       case 'S': | ||
|  |         return InlineAsm::Constraint_S; | ||
|  |       case 'T': | ||
|  |         return InlineAsm::Constraint_T; | ||
|  |       } | ||
|  |     } | ||
|  |     return TargetLowering::getInlineAsmMemConstraint(ConstraintCode); | ||
|  |   } | ||
|  | 
 | ||
|  |   /// If a physical register, this returns the register that receives the
 | ||
|  |   /// exception address on entry to an EH pad.
 | ||
|  |   unsigned | ||
|  |   getExceptionPointerRegister(const Constant *PersonalityFn) const override { | ||
|  |     return SystemZ::R6D; | ||
|  |   } | ||
|  | 
 | ||
|  |   /// If a physical register, this returns the register that receives the
 | ||
|  |   /// exception typeid on entry to a landing pad.
 | ||
|  |   unsigned | ||
|  |   getExceptionSelectorRegister(const Constant *PersonalityFn) const override { | ||
|  |     return SystemZ::R7D; | ||
|  |   } | ||
|  | 
 | ||
|  |   /// Override to support customized stack guard loading.
 | ||
|  |   bool useLoadStackGuardNode() const override { | ||
|  |     return true; | ||
|  |   } | ||
|  |   void insertSSPDeclarations(Module &M) const override { | ||
|  |   } | ||
|  | 
 | ||
|  |   MachineBasicBlock * | ||
|  |   EmitInstrWithCustomInserter(MachineInstr &MI, | ||
|  |                               MachineBasicBlock *BB) const override; | ||
|  |   SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const override; | ||
|  |   void LowerOperationWrapper(SDNode *N, SmallVectorImpl<SDValue> &Results, | ||
|  |                              SelectionDAG &DAG) const override; | ||
|  |   void ReplaceNodeResults(SDNode *N, SmallVectorImpl<SDValue>&Results, | ||
|  |                           SelectionDAG &DAG) const override; | ||
|  |   bool allowTruncateForTailCall(Type *, Type *) const override; | ||
|  |   bool mayBeEmittedAsTailCall(const CallInst *CI) 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; | ||
|  |   SDValue LowerCall(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, const SDLoc &DL, | ||
|  |                       SelectionDAG &DAG) const override; | ||
|  |   SDValue PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const override; | ||
|  | 
 | ||
|  |   ISD::NodeType getExtendForAtomicOps() const override { | ||
|  |     return ISD::ANY_EXTEND; | ||
|  |   } | ||
|  | 
 | ||
|  |   bool supportSwiftError() const override { | ||
|  |     return true; | ||
|  |   } | ||
|  | 
 | ||
|  | private: | ||
|  |   const SystemZSubtarget &Subtarget; | ||
|  | 
 | ||
|  |   // Implement LowerOperation for individual opcodes.
 | ||
|  |   SDValue getVectorCmp(SelectionDAG &DAG, unsigned Opcode, | ||
|  |                        const SDLoc &DL, EVT VT, | ||
|  |                        SDValue CmpOp0, SDValue CmpOp1) const; | ||
|  |   SDValue lowerVectorSETCC(SelectionDAG &DAG, const SDLoc &DL, | ||
|  |                            EVT VT, ISD::CondCode CC, | ||
|  |                            SDValue CmpOp0, SDValue CmpOp1) const; | ||
|  |   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 lowerTLSGetOffset(GlobalAddressSDNode *Node, | ||
|  |                             SelectionDAG &DAG, unsigned Opcode, | ||
|  |                             SDValue GOTOffset) const; | ||
|  |   SDValue lowerThreadPointer(const SDLoc &DL, 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 lowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const; | ||
|  |   SDValue lowerRETURNADDR(SDValue Op, 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 lowerGET_DYNAMIC_AREA_OFFSET(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 lowerCTPOP(SDValue Op, SelectionDAG &DAG) const; | ||
|  |   SDValue lowerATOMIC_FENCE(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 lowerSTACKSAVE(SDValue Op, SelectionDAG &DAG) const; | ||
|  |   SDValue lowerSTACKRESTORE(SDValue Op, SelectionDAG &DAG) const; | ||
|  |   SDValue lowerPREFETCH(SDValue Op, SelectionDAG &DAG) const; | ||
|  |   SDValue lowerINTRINSIC_W_CHAIN(SDValue Op, SelectionDAG &DAG) const; | ||
|  |   SDValue lowerINTRINSIC_WO_CHAIN(SDValue Op, SelectionDAG &DAG) const; | ||
|  |   SDValue lowerBUILD_VECTOR(SDValue Op, SelectionDAG &DAG) const; | ||
|  |   SDValue lowerVECTOR_SHUFFLE(SDValue Op, SelectionDAG &DAG) const; | ||
|  |   SDValue lowerSCALAR_TO_VECTOR(SDValue Op, SelectionDAG &DAG) const; | ||
|  |   SDValue lowerINSERT_VECTOR_ELT(SDValue Op, SelectionDAG &DAG) const; | ||
|  |   SDValue lowerEXTRACT_VECTOR_ELT(SDValue Op, SelectionDAG &DAG) const; | ||
|  |   SDValue lowerExtendVectorInreg(SDValue Op, SelectionDAG &DAG, | ||
|  |                                  unsigned UnpackHigh) const; | ||
|  |   SDValue lowerShift(SDValue Op, SelectionDAG &DAG, unsigned ByScalar) const; | ||
|  | 
 | ||
|  |   bool canTreatAsByteVector(EVT VT) const; | ||
|  |   SDValue combineExtract(const SDLoc &DL, EVT ElemVT, EVT VecVT, SDValue OrigOp, | ||
|  |                          unsigned Index, DAGCombinerInfo &DCI, | ||
|  |                          bool Force) const; | ||
|  |   SDValue combineTruncateExtract(const SDLoc &DL, EVT TruncVT, SDValue Op, | ||
|  |                                  DAGCombinerInfo &DCI) const; | ||
|  |   SDValue combineSIGN_EXTEND(SDNode *N, DAGCombinerInfo &DCI) const; | ||
|  |   SDValue combineMERGE(SDNode *N, DAGCombinerInfo &DCI) const; | ||
|  |   SDValue combineSTORE(SDNode *N, DAGCombinerInfo &DCI) const; | ||
|  |   SDValue combineEXTRACT_VECTOR_ELT(SDNode *N, DAGCombinerInfo &DCI) const; | ||
|  |   SDValue combineJOIN_DWORDS(SDNode *N, DAGCombinerInfo &DCI) const; | ||
|  |   SDValue combineFP_ROUND(SDNode *N, DAGCombinerInfo &DCI) const; | ||
|  |   SDValue combineBSWAP(SDNode *N, DAGCombinerInfo &DCI) const; | ||
|  |   SDValue combineSHIFTROT(SDNode *N, DAGCombinerInfo &DCI) 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, | ||
|  |                                 unsigned LOCROpcode) const; | ||
|  |   MachineBasicBlock *emitCondStore(MachineInstr &MI, MachineBasicBlock *BB, | ||
|  |                                    unsigned StoreOpcode, unsigned STOCOpcode, | ||
|  |                                    bool Invert) const; | ||
|  |   MachineBasicBlock *emitPair128(MachineInstr &MI, | ||
|  |                                  MachineBasicBlock *MBB) const; | ||
|  |   MachineBasicBlock *emitExt128(MachineInstr &MI, MachineBasicBlock *MBB, | ||
|  |                                 bool ClearEven) 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; | ||
|  |   MachineBasicBlock *emitTransactionBegin(MachineInstr &MI, | ||
|  |                                           MachineBasicBlock *MBB, | ||
|  |                                           unsigned Opcode, bool NoFloat) const; | ||
|  |   MachineBasicBlock *emitLoadAndTestCmp0(MachineInstr &MI, | ||
|  |                                          MachineBasicBlock *MBB, | ||
|  |                                          unsigned Opcode) const; | ||
|  | 
 | ||
|  |   const TargetRegisterClass *getRepRegClassFor(MVT VT) const override; | ||
|  | }; | ||
|  | } // end namespace llvm
 | ||
|  | 
 | ||
|  | #endif
 |