1 //===-- X86ISelLowering.h - X86 DAG Lowering Interface ----------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines the interfaces that X86 uses to lower LLVM code into a
13 //===----------------------------------------------------------------------===//
15 #ifndef X86ISELLOWERING_H
16 #define X86ISELLOWERING_H
18 #include "X86Subtarget.h"
19 #include "X86RegisterInfo.h"
20 #include "X86MachineFunctionInfo.h"
21 #include "llvm/Target/TargetLowering.h"
22 #include "llvm/Target/TargetOptions.h"
23 #include "llvm/CodeGen/FastISel.h"
24 #include "llvm/CodeGen/SelectionDAG.h"
25 #include "llvm/CodeGen/CallingConvLower.h"
29 // X86 Specific DAG Nodes
31 // Start the numbering where the builtin ops leave off.
32 FIRST_NUMBER = ISD::BUILTIN_OP_END,
34 /// BSF - Bit scan forward.
35 /// BSR - Bit scan reverse.
39 /// SHLD, SHRD - Double shift instructions. These correspond to
40 /// X86::SHLDxx and X86::SHRDxx instructions.
44 /// FAND - Bitwise logical AND of floating point values. This corresponds
45 /// to X86::ANDPS or X86::ANDPD.
48 /// FOR - Bitwise logical OR of floating point values. This corresponds
49 /// to X86::ORPS or X86::ORPD.
52 /// FXOR - Bitwise logical XOR of floating point values. This corresponds
53 /// to X86::XORPS or X86::XORPD.
56 /// FSRL - Bitwise logical right shift of floating point values. These
57 /// corresponds to X86::PSRLDQ.
60 /// CALL - These operations represent an abstract X86 call
61 /// instruction, which includes a bunch of information. In particular the
62 /// operands of these node are:
64 /// #0 - The incoming token chain
66 /// #2 - The number of arg bytes the caller pushes on the stack.
67 /// #3 - The number of arg bytes the callee pops off the stack.
68 /// #4 - The value to pass in AL/AX/EAX (optional)
69 /// #5 - The value to pass in DL/DX/EDX (optional)
71 /// The result values of these nodes are:
73 /// #0 - The outgoing token chain
74 /// #1 - The first register result value (optional)
75 /// #2 - The second register result value (optional)
79 /// RDTSC_DAG - This operation implements the lowering for
83 /// X86 compare and logical compare instructions.
86 /// X86 bit-test instructions.
89 /// X86 SetCC. Operand 0 is condition code, and operand 1 is the flag
90 /// operand produced by a CMP instruction.
93 // Same as SETCC except it's materialized with a sbb and the value is all
94 // one's or all zero's.
97 /// X86 conditional moves. Operand 0 and operand 1 are the two values
98 /// to select from. Operand 2 is the condition code, and operand 3 is the
99 /// flag operand produced by a CMP or TEST instruction. It also writes a
103 /// X86 conditional branches. Operand 0 is the chain operand, operand 1
104 /// is the block to branch if condition is true, operand 2 is the
105 /// condition code, and operand 3 is the flag operand produced by a CMP
106 /// or TEST instruction.
109 /// Return with a flag operand. Operand 0 is the chain operand, operand
110 /// 1 is the number of bytes of stack to pop.
113 /// REP_STOS - Repeat fill, corresponds to X86::REP_STOSx.
116 /// REP_MOVS - Repeat move, corresponds to X86::REP_MOVSx.
119 /// GlobalBaseReg - On Darwin, this node represents the result of the popl
120 /// at function entry, used for PIC code.
123 /// Wrapper - A wrapper node for TargetConstantPool,
124 /// TargetExternalSymbol, and TargetGlobalAddress.
127 /// WrapperRIP - Special wrapper used under X86-64 PIC mode for RIP
128 /// relative displacements.
131 /// MOVQ2DQ - Copies a 64-bit value from an MMX vector to the low word
132 /// of an XMM vector, with the high word zero filled.
135 /// MOVDQ2Q - Copies a 64-bit value from the low word of an XMM vector
136 /// to an MMX vector. If you think this is too close to the previous
137 /// mnemonic, so do I; blame Intel.
140 /// PEXTRB - Extract an 8-bit value from a vector and zero extend it to
141 /// i32, corresponds to X86::PEXTRB.
144 /// PEXTRW - Extract a 16-bit value from a vector and zero extend it to
145 /// i32, corresponds to X86::PEXTRW.
148 /// INSERTPS - Insert any element of a 4 x float vector into any element
149 /// of a destination 4 x floatvector.
152 /// PINSRB - Insert the lower 8-bits of a 32-bit value to a vector,
153 /// corresponds to X86::PINSRB.
156 /// PINSRW - Insert the lower 16-bits of a 32-bit value to a vector,
157 /// corresponds to X86::PINSRW.
160 /// PSHUFB - Shuffle 16 8-bit values within a vector.
163 /// FMAX, FMIN - Floating point max and min.
167 /// FRSQRT, FRCP - Floating point reciprocal-sqrt and reciprocal
168 /// approximation. Note that these typically require refinement
169 /// in order to obtain suitable precision.
172 // TLSADDR - Thread Local Storage.
175 // TLSCALL - Thread Local Storage. When calling to an OS provided
176 // thunk at the address from an earlier relocation.
179 // EH_RETURN - Exception Handling helpers.
182 /// TC_RETURN - Tail call return.
184 /// operand #1 callee (register or absolute)
185 /// operand #2 stack adjustment
186 /// operand #3 optional in flag
189 // VZEXT_MOVL - Vector move low and zero extend.
192 // VSHL, VSRL - Vector logical left / right shift.
195 // CMPPD, CMPPS - Vector double/float comparison.
196 // CMPPD, CMPPS - Vector double/float comparison.
199 // PCMP* - Vector integer comparisons.
200 PCMPEQB, PCMPEQW, PCMPEQD, PCMPEQQ,
201 PCMPGTB, PCMPGTW, PCMPGTD, PCMPGTQ,
203 // ADD, SUB, SMUL, UMUL, etc. - Arithmetic operations with FLAGS results.
204 ADD, SUB, SMUL, UMUL,
205 INC, DEC, OR, XOR, AND,
207 // MUL_IMM - X86 specific multiply by immediate.
210 // PTEST - Vector bitwise comparisons
213 // TESTP - Vector packed fp sign bitwise comparisons
216 // Several flavors of instructions with vector shuffle behaviors.
251 // VASTART_SAVE_XMM_REGS - Save xmm argument registers to the stack,
252 // according to %al. An operator is needed so that this can be expanded
253 // with control flow.
254 VASTART_SAVE_XMM_REGS,
256 // WIN_ALLOCA - Windows's _chkstk call to do stack probing.
259 // ATOMADD64_DAG, ATOMSUB64_DAG, ATOMOR64_DAG, ATOMAND64_DAG,
260 // ATOMXOR64_DAG, ATOMNAND64_DAG, ATOMSWAP64_DAG -
261 // Atomic 64-bit binary operations.
262 ATOMADD64_DAG = ISD::FIRST_TARGET_MEMORY_OPCODE,
276 // LCMPXCHG_DAG, LCMPXCHG8_DAG - Compare and swap.
280 // VZEXT_LOAD - Load, scalar_to_vector, and zero extend.
283 // FNSTCW16m - Store FP control world into i16 memory.
286 /// FP_TO_INT*_IN_MEM - This instruction implements FP_TO_SINT with the
287 /// integer destination in memory and a FP reg source. This corresponds
288 /// to the X86::FIST*m instructions and the rounding mode change stuff. It
289 /// has two inputs (token chain and address) and two outputs (int value
290 /// and token chain).
295 /// FILD, FILD_FLAG - This instruction implements SINT_TO_FP with the
296 /// integer source in memory and FP reg result. This corresponds to the
297 /// X86::FILD*m instructions. It has three inputs (token chain, address,
298 /// and source type) and two outputs (FP value and token chain). FILD_FLAG
299 /// also produces a flag).
303 /// FLD - This instruction implements an extending load to FP stack slots.
304 /// This corresponds to the X86::FLD32m / X86::FLD64m. It takes a chain
305 /// operand, ptr to load from, and a ValueType node indicating the type
309 /// FST - This instruction implements a truncating store to FP stack
310 /// slots. This corresponds to the X86::FST32m / X86::FST64m. It takes a
311 /// chain operand, value to store, address, and a ValueType to store it
315 /// VAARG_64 - This instruction grabs the address of the next argument
316 /// from a va_list. (reads and modifies the va_list in memory)
319 // WARNING: Do not add anything in the end unless you want the node to
320 // have memop! In fact, starting from ATOMADD64_DAG all opcodes will be
321 // thought as target memory ops!
325 /// Define some predicates that are used for node matching.
327 /// isPSHUFDMask - Return true if the specified VECTOR_SHUFFLE operand
328 /// specifies a shuffle of elements that is suitable for input to PSHUFD.
329 bool isPSHUFDMask(ShuffleVectorSDNode *N);
331 /// isPSHUFHWMask - Return true if the specified VECTOR_SHUFFLE operand
332 /// specifies a shuffle of elements that is suitable for input to PSHUFD.
333 bool isPSHUFHWMask(ShuffleVectorSDNode *N);
335 /// isPSHUFLWMask - Return true if the specified VECTOR_SHUFFLE operand
336 /// specifies a shuffle of elements that is suitable for input to PSHUFD.
337 bool isPSHUFLWMask(ShuffleVectorSDNode *N);
339 /// isSHUFPMask - Return true if the specified VECTOR_SHUFFLE operand
340 /// specifies a shuffle of elements that is suitable for input to SHUFP*.
341 bool isSHUFPMask(ShuffleVectorSDNode *N);
343 /// isMOVHLPSMask - Return true if the specified VECTOR_SHUFFLE operand
344 /// specifies a shuffle of elements that is suitable for input to MOVHLPS.
345 bool isMOVHLPSMask(ShuffleVectorSDNode *N);
347 /// isMOVHLPS_v_undef_Mask - Special case of isMOVHLPSMask for canonical form
348 /// of vector_shuffle v, v, <2, 3, 2, 3>, i.e. vector_shuffle v, undef,
350 bool isMOVHLPS_v_undef_Mask(ShuffleVectorSDNode *N);
352 /// isMOVLPMask - Return true if the specified VECTOR_SHUFFLE operand
353 /// specifies a shuffle of elements that is suitable for MOVLP{S|D}.
354 bool isMOVLPMask(ShuffleVectorSDNode *N);
356 /// isMOVHPMask - Return true if the specified VECTOR_SHUFFLE operand
357 /// specifies a shuffle of elements that is suitable for MOVHP{S|D}.
358 /// as well as MOVLHPS.
359 bool isMOVLHPSMask(ShuffleVectorSDNode *N);
361 /// isUNPCKLMask - Return true if the specified VECTOR_SHUFFLE operand
362 /// specifies a shuffle of elements that is suitable for input to UNPCKL.
363 bool isUNPCKLMask(ShuffleVectorSDNode *N, bool V2IsSplat = false);
365 /// isUNPCKHMask - Return true if the specified VECTOR_SHUFFLE operand
366 /// specifies a shuffle of elements that is suitable for input to UNPCKH.
367 bool isUNPCKHMask(ShuffleVectorSDNode *N, bool V2IsSplat = false);
369 /// isUNPCKL_v_undef_Mask - Special case of isUNPCKLMask for canonical form
370 /// of vector_shuffle v, v, <0, 4, 1, 5>, i.e. vector_shuffle v, undef,
372 bool isUNPCKL_v_undef_Mask(ShuffleVectorSDNode *N);
374 /// isUNPCKH_v_undef_Mask - Special case of isUNPCKHMask for canonical form
375 /// of vector_shuffle v, v, <2, 6, 3, 7>, i.e. vector_shuffle v, undef,
377 bool isUNPCKH_v_undef_Mask(ShuffleVectorSDNode *N);
379 /// isMOVLMask - Return true if the specified VECTOR_SHUFFLE operand
380 /// specifies a shuffle of elements that is suitable for input to MOVSS,
381 /// MOVSD, and MOVD, i.e. setting the lowest element.
382 bool isMOVLMask(ShuffleVectorSDNode *N);
384 /// isMOVSHDUPMask - Return true if the specified VECTOR_SHUFFLE operand
385 /// specifies a shuffle of elements that is suitable for input to MOVSHDUP.
386 bool isMOVSHDUPMask(ShuffleVectorSDNode *N);
388 /// isMOVSLDUPMask - Return true if the specified VECTOR_SHUFFLE operand
389 /// specifies a shuffle of elements that is suitable for input to MOVSLDUP.
390 bool isMOVSLDUPMask(ShuffleVectorSDNode *N);
392 /// isMOVDDUPMask - Return true if the specified VECTOR_SHUFFLE operand
393 /// specifies a shuffle of elements that is suitable for input to MOVDDUP.
394 bool isMOVDDUPMask(ShuffleVectorSDNode *N);
396 /// isPALIGNRMask - Return true if the specified VECTOR_SHUFFLE operand
397 /// specifies a shuffle of elements that is suitable for input to PALIGNR.
398 bool isPALIGNRMask(ShuffleVectorSDNode *N);
400 /// getShuffleSHUFImmediate - Return the appropriate immediate to shuffle
401 /// the specified isShuffleMask VECTOR_SHUFFLE mask with PSHUF* and SHUFP*
403 unsigned getShuffleSHUFImmediate(SDNode *N);
405 /// getShufflePSHUFHWImmediate - Return the appropriate immediate to shuffle
406 /// the specified VECTOR_SHUFFLE mask with PSHUFHW instruction.
407 unsigned getShufflePSHUFHWImmediate(SDNode *N);
409 /// getShufflePSHUFLWImmediate - Return the appropriate immediate to shuffle
410 /// the specified VECTOR_SHUFFLE mask with PSHUFLW instruction.
411 unsigned getShufflePSHUFLWImmediate(SDNode *N);
413 /// getShufflePALIGNRImmediate - Return the appropriate immediate to shuffle
414 /// the specified VECTOR_SHUFFLE mask with the PALIGNR instruction.
415 unsigned getShufflePALIGNRImmediate(SDNode *N);
417 /// isZeroNode - Returns true if Elt is a constant zero or a floating point
419 bool isZeroNode(SDValue Elt);
421 /// isOffsetSuitableForCodeModel - Returns true of the given offset can be
422 /// fit into displacement field of the instruction.
423 bool isOffsetSuitableForCodeModel(int64_t Offset, CodeModel::Model M,
424 bool hasSymbolicDisplacement = true);
427 //===--------------------------------------------------------------------===//
428 // X86TargetLowering - X86 Implementation of the TargetLowering interface
429 class X86TargetLowering : public TargetLowering {
431 explicit X86TargetLowering(X86TargetMachine &TM);
433 virtual unsigned getJumpTableEncoding() const;
435 virtual const MCExpr *
436 LowerCustomJumpTableEntry(const MachineJumpTableInfo *MJTI,
437 const MachineBasicBlock *MBB, unsigned uid,
438 MCContext &Ctx) const;
440 /// getPICJumpTableRelocaBase - Returns relocation base for the given PIC
442 virtual SDValue getPICJumpTableRelocBase(SDValue Table,
443 SelectionDAG &DAG) const;
444 virtual const MCExpr *
445 getPICJumpTableRelocBaseExpr(const MachineFunction *MF,
446 unsigned JTI, MCContext &Ctx) const;
448 /// getStackPtrReg - Return the stack pointer register we are using: either
450 unsigned getStackPtrReg() const { return X86StackPtr; }
452 /// getByValTypeAlignment - Return the desired alignment for ByVal aggregate
453 /// function arguments in the caller parameter area. For X86, aggregates
454 /// that contains are placed at 16-byte boundaries while the rest are at
455 /// 4-byte boundaries.
456 virtual unsigned getByValTypeAlignment(const Type *Ty) const;
458 /// getOptimalMemOpType - Returns the target specific optimal type for load
459 /// and store operations as a result of memset, memcpy, and memmove
460 /// lowering. If DstAlign is zero that means it's safe to destination
461 /// alignment can satisfy any constraint. Similarly if SrcAlign is zero it
462 /// means there isn't a need to check it against alignment requirement,
463 /// probably because the source does not need to be loaded. If
464 /// 'NonScalarIntSafe' is true, that means it's safe to return a
465 /// non-scalar-integer type, e.g. empty string source, constant, or loaded
466 /// from memory. 'MemcpyStrSrc' indicates whether the memcpy source is
467 /// constant so it does not need to be loaded.
468 /// It returns EVT::Other if the type should be determined using generic
469 /// target-independent logic.
471 getOptimalMemOpType(uint64_t Size, unsigned DstAlign, unsigned SrcAlign,
472 bool NonScalarIntSafe, bool MemcpyStrSrc,
473 MachineFunction &MF) const;
475 /// allowsUnalignedMemoryAccesses - Returns true if the target allows
476 /// unaligned memory accesses. of the specified type.
477 virtual bool allowsUnalignedMemoryAccesses(EVT VT) const {
481 /// LowerOperation - Provide custom lowering hooks for some operations.
483 virtual SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const;
485 /// ReplaceNodeResults - Replace the results of node with an illegal result
486 /// type with new values built out of custom code.
488 virtual void ReplaceNodeResults(SDNode *N, SmallVectorImpl<SDValue>&Results,
489 SelectionDAG &DAG) const;
492 virtual SDValue PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const;
494 /// isTypeDesirableForOp - Return true if the target has native support for
495 /// the specified value type and it is 'desirable' to use the type for the
496 /// given node type. e.g. On x86 i16 is legal, but undesirable since i16
497 /// instruction encodings are longer and some i16 instructions are slow.
498 virtual bool isTypeDesirableForOp(unsigned Opc, EVT VT) const;
500 /// isTypeDesirable - Return true if the target has native support for the
501 /// specified value type and it is 'desirable' to use the type. e.g. On x86
502 /// i16 is legal, but undesirable since i16 instruction encodings are longer
503 /// and some i16 instructions are slow.
504 virtual bool IsDesirableToPromoteOp(SDValue Op, EVT &PVT) const;
506 virtual MachineBasicBlock *
507 EmitInstrWithCustomInserter(MachineInstr *MI,
508 MachineBasicBlock *MBB) const;
511 /// getTargetNodeName - This method returns the name of a target specific
513 virtual const char *getTargetNodeName(unsigned Opcode) const;
515 /// getSetCCResultType - Return the ISD::SETCC ValueType
516 virtual MVT::SimpleValueType getSetCCResultType(EVT VT) const;
518 /// computeMaskedBitsForTargetNode - Determine which of the bits specified
519 /// in Mask are known to be either zero or one and return them in the
520 /// KnownZero/KnownOne bitsets.
521 virtual void computeMaskedBitsForTargetNode(const SDValue Op,
525 const SelectionDAG &DAG,
526 unsigned Depth = 0) const;
528 // ComputeNumSignBitsForTargetNode - Determine the number of bits in the
529 // operation that are sign bits.
530 virtual unsigned ComputeNumSignBitsForTargetNode(SDValue Op,
531 unsigned Depth) const;
534 isGAPlusOffset(SDNode *N, const GlobalValue* &GA, int64_t &Offset) const;
536 SDValue getReturnAddressFrameIndex(SelectionDAG &DAG) const;
538 virtual bool ExpandInlineAsm(CallInst *CI) const;
540 ConstraintType getConstraintType(const std::string &Constraint) const;
542 /// Examine constraint string and operand type and determine a weight value.
543 /// The operand object must already have been set up with the operand type.
544 virtual ConstraintWeight getSingleConstraintMatchWeight(
545 AsmOperandInfo &info, const char *constraint) const;
547 std::vector<unsigned>
548 getRegClassForInlineAsmConstraint(const std::string &Constraint,
551 virtual const char *LowerXConstraint(EVT ConstraintVT) const;
553 /// LowerAsmOperandForConstraint - Lower the specified operand into the Ops
554 /// vector. If it is invalid, don't add anything to Ops. If hasMemory is
555 /// true it means one of the asm constraint of the inline asm instruction
556 /// being processed is 'm'.
557 virtual void LowerAsmOperandForConstraint(SDValue Op,
558 char ConstraintLetter,
559 std::vector<SDValue> &Ops,
560 SelectionDAG &DAG) const;
562 /// getRegForInlineAsmConstraint - Given a physical register constraint
563 /// (e.g. {edx}), return the register number and the register class for the
564 /// register. This should only be used for C_Register constraints. On
565 /// error, this returns a register number of 0.
566 std::pair<unsigned, const TargetRegisterClass*>
567 getRegForInlineAsmConstraint(const std::string &Constraint,
570 /// isLegalAddressingMode - Return true if the addressing mode represented
571 /// by AM is legal for this target, for a load/store of the specified type.
572 virtual bool isLegalAddressingMode(const AddrMode &AM, const Type *Ty)const;
574 /// isTruncateFree - Return true if it's free to truncate a value of
575 /// type Ty1 to type Ty2. e.g. On x86 it's free to truncate a i32 value in
576 /// register EAX to i16 by referencing its sub-register AX.
577 virtual bool isTruncateFree(const Type *Ty1, const Type *Ty2) const;
578 virtual bool isTruncateFree(EVT VT1, EVT VT2) const;
580 /// isZExtFree - Return true if any actual instruction that defines a
581 /// value of type Ty1 implicit zero-extends the value to Ty2 in the result
582 /// register. This does not necessarily include registers defined in
583 /// unknown ways, such as incoming arguments, or copies from unknown
584 /// virtual registers. Also, if isTruncateFree(Ty2, Ty1) is true, this
585 /// does not necessarily apply to truncate instructions. e.g. on x86-64,
586 /// all instructions that define 32-bit values implicit zero-extend the
587 /// result out to 64 bits.
588 virtual bool isZExtFree(const Type *Ty1, const Type *Ty2) const;
589 virtual bool isZExtFree(EVT VT1, EVT VT2) const;
591 /// isNarrowingProfitable - Return true if it's profitable to narrow
592 /// operations of type VT1 to VT2. e.g. on x86, it's profitable to narrow
593 /// from i32 to i8 but not from i32 to i16.
594 virtual bool isNarrowingProfitable(EVT VT1, EVT VT2) const;
596 /// isFPImmLegal - Returns true if the target can instruction select the
597 /// specified FP immediate natively. If false, the legalizer will
598 /// materialize the FP immediate as a load from a constant pool.
599 virtual bool isFPImmLegal(const APFloat &Imm, EVT VT) const;
601 /// isShuffleMaskLegal - Targets can use this to indicate that they only
602 /// support *some* VECTOR_SHUFFLE operations, those with specific masks.
603 /// By default, if a target supports the VECTOR_SHUFFLE node, all mask
604 /// values are assumed to be legal.
605 virtual bool isShuffleMaskLegal(const SmallVectorImpl<int> &Mask,
608 /// isVectorClearMaskLegal - Similar to isShuffleMaskLegal. This is
609 /// used by Targets can use this to indicate if there is a suitable
610 /// VECTOR_SHUFFLE that can be used to replace a VAND with a constant
612 virtual bool isVectorClearMaskLegal(const SmallVectorImpl<int> &Mask,
615 /// ShouldShrinkFPConstant - If true, then instruction selection should
616 /// seek to shrink the FP constant of the specified type to a smaller type
617 /// in order to save space and / or reduce runtime.
618 virtual bool ShouldShrinkFPConstant(EVT VT) const {
619 // Don't shrink FP constpool if SSE2 is available since cvtss2sd is more
620 // expensive than a straight movsd. On the other hand, it's important to
621 // shrink long double fp constant since fldt is very slow.
622 return !X86ScalarSSEf64 || VT == MVT::f80;
625 const X86Subtarget* getSubtarget() const {
629 /// isScalarFPTypeInSSEReg - Return true if the specified scalar FP type is
630 /// computed in an SSE register, not on the X87 floating point stack.
631 bool isScalarFPTypeInSSEReg(EVT VT) const {
632 return (VT == MVT::f64 && X86ScalarSSEf64) || // f64 is when SSE2
633 (VT == MVT::f32 && X86ScalarSSEf32); // f32 is when SSE1
636 /// createFastISel - This method returns a target specific FastISel object,
637 /// or null if the target does not support "fast" ISel.
638 virtual FastISel *createFastISel(FunctionLoweringInfo &funcInfo) const;
640 /// getFunctionAlignment - Return the Log2 alignment of this function.
641 virtual unsigned getFunctionAlignment(const Function *F) const;
643 unsigned getRegPressureLimit(const TargetRegisterClass *RC,
644 MachineFunction &MF) const;
646 /// getStackCookieLocation - Return true if the target stores stack
647 /// protector cookies at a fixed offset in some non-standard address
648 /// space, and populates the address space and offset as
650 virtual bool getStackCookieLocation(unsigned &AddressSpace, unsigned &Offset) const;
653 std::pair<const TargetRegisterClass*, uint8_t>
654 findRepresentativeClass(EVT VT) const;
657 /// Subtarget - Keep a pointer to the X86Subtarget around so that we can
658 /// make the right decision when generating code for different targets.
659 const X86Subtarget *Subtarget;
660 const X86RegisterInfo *RegInfo;
661 const TargetData *TD;
663 /// X86StackPtr - X86 physical register used as stack ptr.
664 unsigned X86StackPtr;
666 /// X86ScalarSSEf32, X86ScalarSSEf64 - Select between SSE or x87
667 /// floating point ops.
668 /// When SSE is available, use it for f32 operations.
669 /// When SSE2 is available, use it for f64 operations.
670 bool X86ScalarSSEf32;
671 bool X86ScalarSSEf64;
673 /// LegalFPImmediates - A list of legal fp immediates.
674 std::vector<APFloat> LegalFPImmediates;
676 /// addLegalFPImmediate - Indicate that this x86 target can instruction
677 /// select the specified FP immediate natively.
678 void addLegalFPImmediate(const APFloat& Imm) {
679 LegalFPImmediates.push_back(Imm);
682 SDValue LowerCallResult(SDValue Chain, SDValue InFlag,
683 CallingConv::ID CallConv, bool isVarArg,
684 const SmallVectorImpl<ISD::InputArg> &Ins,
685 DebugLoc dl, SelectionDAG &DAG,
686 SmallVectorImpl<SDValue> &InVals) const;
687 SDValue LowerMemArgument(SDValue Chain,
688 CallingConv::ID CallConv,
689 const SmallVectorImpl<ISD::InputArg> &ArgInfo,
690 DebugLoc dl, SelectionDAG &DAG,
691 const CCValAssign &VA, MachineFrameInfo *MFI,
693 SDValue LowerMemOpCallTo(SDValue Chain, SDValue StackPtr, SDValue Arg,
694 DebugLoc dl, SelectionDAG &DAG,
695 const CCValAssign &VA,
696 ISD::ArgFlagsTy Flags) const;
698 // Call lowering helpers.
700 /// IsEligibleForTailCallOptimization - Check whether the call is eligible
701 /// for tail call optimization. Targets which want to do tail call
702 /// optimization should implement this function.
703 bool IsEligibleForTailCallOptimization(SDValue Callee,
704 CallingConv::ID CalleeCC,
706 bool isCalleeStructRet,
707 bool isCallerStructRet,
708 const SmallVectorImpl<ISD::OutputArg> &Outs,
709 const SmallVectorImpl<SDValue> &OutVals,
710 const SmallVectorImpl<ISD::InputArg> &Ins,
711 SelectionDAG& DAG) const;
712 bool IsCalleePop(bool isVarArg, CallingConv::ID CallConv) const;
713 SDValue EmitTailCallLoadRetAddr(SelectionDAG &DAG, SDValue &OutRetAddr,
714 SDValue Chain, bool IsTailCall, bool Is64Bit,
715 int FPDiff, DebugLoc dl) const;
717 unsigned GetAlignedArgumentStackSize(unsigned StackSize,
718 SelectionDAG &DAG) const;
720 std::pair<SDValue,SDValue> FP_TO_INTHelper(SDValue Op, SelectionDAG &DAG,
721 bool isSigned) const;
723 SDValue LowerAsSplatVectorLoad(SDValue SrcOp, EVT VT, DebugLoc dl,
724 SelectionDAG &DAG) const;
725 SDValue LowerBUILD_VECTOR(SDValue Op, SelectionDAG &DAG) const;
726 SDValue LowerCONCAT_VECTORS(SDValue Op, SelectionDAG &DAG) const;
727 SDValue LowerVECTOR_SHUFFLE(SDValue Op, SelectionDAG &DAG) const;
728 SDValue LowerEXTRACT_VECTOR_ELT(SDValue Op, SelectionDAG &DAG) const;
729 SDValue LowerEXTRACT_VECTOR_ELT_SSE4(SDValue Op, SelectionDAG &DAG) const;
730 SDValue LowerINSERT_VECTOR_ELT(SDValue Op, SelectionDAG &DAG) const;
731 SDValue LowerINSERT_VECTOR_ELT_SSE4(SDValue Op, SelectionDAG &DAG) const;
732 SDValue LowerSCALAR_TO_VECTOR(SDValue Op, SelectionDAG &DAG) const;
733 SDValue LowerConstantPool(SDValue Op, SelectionDAG &DAG) const;
734 SDValue LowerBlockAddress(SDValue Op, SelectionDAG &DAG) const;
735 SDValue LowerGlobalAddress(const GlobalValue *GV, DebugLoc dl,
736 int64_t Offset, SelectionDAG &DAG) const;
737 SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const;
738 SDValue LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const;
739 SDValue LowerExternalSymbol(SDValue Op, SelectionDAG &DAG) const;
740 SDValue LowerShift(SDValue Op, SelectionDAG &DAG) const;
741 SDValue BuildFILD(SDValue Op, EVT SrcVT, SDValue Chain, SDValue StackSlot,
742 SelectionDAG &DAG) const;
743 SDValue LowerBIT_CONVERT(SDValue op, SelectionDAG &DAG) const;
744 SDValue LowerSINT_TO_FP(SDValue Op, SelectionDAG &DAG) const;
745 SDValue LowerUINT_TO_FP(SDValue Op, SelectionDAG &DAG) const;
746 SDValue LowerUINT_TO_FP_i64(SDValue Op, SelectionDAG &DAG) const;
747 SDValue LowerUINT_TO_FP_i32(SDValue Op, SelectionDAG &DAG) const;
748 SDValue LowerFP_TO_SINT(SDValue Op, SelectionDAG &DAG) const;
749 SDValue LowerFP_TO_UINT(SDValue Op, SelectionDAG &DAG) const;
750 SDValue LowerFABS(SDValue Op, SelectionDAG &DAG) const;
751 SDValue LowerFNEG(SDValue Op, SelectionDAG &DAG) const;
752 SDValue LowerFCOPYSIGN(SDValue Op, SelectionDAG &DAG) const;
753 SDValue LowerToBT(SDValue And, ISD::CondCode CC,
754 DebugLoc dl, SelectionDAG &DAG) const;
755 SDValue LowerSETCC(SDValue Op, SelectionDAG &DAG) const;
756 SDValue LowerVSETCC(SDValue Op, SelectionDAG &DAG) const;
757 SDValue LowerSELECT(SDValue Op, SelectionDAG &DAG) const;
758 SDValue LowerBRCOND(SDValue Op, SelectionDAG &DAG) const;
759 SDValue LowerMEMSET(SDValue Op, SelectionDAG &DAG) const;
760 SDValue LowerJumpTable(SDValue Op, SelectionDAG &DAG) const;
761 SDValue LowerDYNAMIC_STACKALLOC(SDValue Op, SelectionDAG &DAG) const;
762 SDValue LowerVASTART(SDValue Op, SelectionDAG &DAG) const;
763 SDValue LowerVAARG(SDValue Op, SelectionDAG &DAG) const;
764 SDValue LowerVACOPY(SDValue Op, SelectionDAG &DAG) const;
765 SDValue LowerINTRINSIC_WO_CHAIN(SDValue Op, SelectionDAG &DAG) const;
766 SDValue LowerRETURNADDR(SDValue Op, SelectionDAG &DAG) const;
767 SDValue LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const;
768 SDValue LowerFRAME_TO_ARGS_OFFSET(SDValue Op, SelectionDAG &DAG) const;
769 SDValue LowerEH_RETURN(SDValue Op, SelectionDAG &DAG) const;
770 SDValue LowerTRAMPOLINE(SDValue Op, SelectionDAG &DAG) const;
771 SDValue LowerFLT_ROUNDS_(SDValue Op, SelectionDAG &DAG) const;
772 SDValue LowerCTLZ(SDValue Op, SelectionDAG &DAG) const;
773 SDValue LowerCTTZ(SDValue Op, SelectionDAG &DAG) const;
774 SDValue LowerMUL_V2I64(SDValue Op, SelectionDAG &DAG) const;
775 SDValue LowerSHL(SDValue Op, SelectionDAG &DAG) const;
776 SDValue LowerXALUO(SDValue Op, SelectionDAG &DAG) const;
778 SDValue LowerCMP_SWAP(SDValue Op, SelectionDAG &DAG) const;
779 SDValue LowerLOAD_SUB(SDValue Op, SelectionDAG &DAG) const;
780 SDValue LowerREADCYCLECOUNTER(SDValue Op, SelectionDAG &DAG) const;
781 SDValue LowerMEMBARRIER(SDValue Op, SelectionDAG &DAG) const;
783 // Utility functions to help LowerVECTOR_SHUFFLE
784 SDValue LowerVECTOR_SHUFFLEv8i16(SDValue Op, SelectionDAG &DAG) const;
787 LowerFormalArguments(SDValue Chain,
788 CallingConv::ID CallConv, bool isVarArg,
789 const SmallVectorImpl<ISD::InputArg> &Ins,
790 DebugLoc dl, SelectionDAG &DAG,
791 SmallVectorImpl<SDValue> &InVals) const;
793 LowerCall(SDValue Chain, SDValue Callee,
794 CallingConv::ID CallConv, bool isVarArg, bool &isTailCall,
795 const SmallVectorImpl<ISD::OutputArg> &Outs,
796 const SmallVectorImpl<SDValue> &OutVals,
797 const SmallVectorImpl<ISD::InputArg> &Ins,
798 DebugLoc dl, SelectionDAG &DAG,
799 SmallVectorImpl<SDValue> &InVals) const;
802 LowerReturn(SDValue Chain,
803 CallingConv::ID CallConv, bool isVarArg,
804 const SmallVectorImpl<ISD::OutputArg> &Outs,
805 const SmallVectorImpl<SDValue> &OutVals,
806 DebugLoc dl, SelectionDAG &DAG) const;
809 CanLowerReturn(CallingConv::ID CallConv, bool isVarArg,
810 const SmallVectorImpl<ISD::OutputArg> &Outs,
811 LLVMContext &Context) const;
813 void ReplaceATOMIC_BINARY_64(SDNode *N, SmallVectorImpl<SDValue> &Results,
814 SelectionDAG &DAG, unsigned NewOp) const;
816 /// Utility function to emit string processing sse4.2 instructions
817 /// that return in xmm0.
818 /// This takes the instruction to expand, the associated machine basic
819 /// block, the number of args, and whether or not the second arg is
820 /// in memory or not.
821 MachineBasicBlock *EmitPCMP(MachineInstr *BInstr, MachineBasicBlock *BB,
822 unsigned argNum, bool inMem) const;
824 /// Utility function to emit atomic bitwise operations (and, or, xor).
825 /// It takes the bitwise instruction to expand, the associated machine basic
826 /// block, and the associated X86 opcodes for reg/reg and reg/imm.
827 MachineBasicBlock *EmitAtomicBitwiseWithCustomInserter(
828 MachineInstr *BInstr,
829 MachineBasicBlock *BB,
836 TargetRegisterClass *RC,
837 bool invSrc = false) const;
839 MachineBasicBlock *EmitAtomicBit6432WithCustomInserter(
840 MachineInstr *BInstr,
841 MachineBasicBlock *BB,
846 bool invSrc = false) const;
848 /// Utility function to emit atomic min and max. It takes the min/max
849 /// instruction to expand, the associated basic block, and the associated
850 /// cmov opcode for moving the min or max value.
851 MachineBasicBlock *EmitAtomicMinMaxWithCustomInserter(MachineInstr *BInstr,
852 MachineBasicBlock *BB,
853 unsigned cmovOpc) const;
855 // Utility function to emit the low-level va_arg code for X86-64.
856 MachineBasicBlock *EmitVAARG64WithCustomInserter(
858 MachineBasicBlock *MBB) const;
860 /// Utility function to emit the xmm reg save portion of va_start.
861 MachineBasicBlock *EmitVAStartSaveXMMRegsWithCustomInserter(
862 MachineInstr *BInstr,
863 MachineBasicBlock *BB) const;
865 MachineBasicBlock *EmitLoweredSelect(MachineInstr *I,
866 MachineBasicBlock *BB) const;
868 MachineBasicBlock *EmitLoweredWinAlloca(MachineInstr *MI,
869 MachineBasicBlock *BB) const;
871 MachineBasicBlock *EmitLoweredTLSCall(MachineInstr *MI,
872 MachineBasicBlock *BB) const;
874 /// Emit nodes that will be selected as "test Op0,Op0", or something
875 /// equivalent, for use with the given x86 condition code.
876 SDValue EmitTest(SDValue Op0, unsigned X86CC, SelectionDAG &DAG) const;
878 /// Emit nodes that will be selected as "cmp Op0,Op1", or something
879 /// equivalent, for use with the given x86 condition code.
880 SDValue EmitCmp(SDValue Op0, SDValue Op1, unsigned X86CC,
881 SelectionDAG &DAG) const;
885 FastISel *createFastISel(FunctionLoweringInfo &funcInfo);
889 #endif // X86ISELLOWERING_H