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 LLVM_LIB_TARGET_X86_X86ISELLOWERING_H
16 #define LLVM_LIB_TARGET_X86_X86ISELLOWERING_H
18 #include "llvm/CodeGen/CallingConvLower.h"
19 #include "llvm/CodeGen/SelectionDAG.h"
20 #include "llvm/CodeGen/TargetLowering.h"
21 #include "llvm/Target/TargetOptions.h"
25 class X86TargetMachine;
28 // X86 Specific DAG Nodes
29 enum NodeType : unsigned {
30 // Start the numbering where the builtin ops leave off.
31 FIRST_NUMBER = ISD::BUILTIN_OP_END,
38 /// Double shift instructions. These correspond to
39 /// X86::SHLDxx and X86::SHRDxx instructions.
43 /// Bitwise logical AND of floating point values. This corresponds
44 /// to X86::ANDPS or X86::ANDPD.
47 /// Bitwise logical OR of floating point values. This corresponds
48 /// to X86::ORPS or X86::ORPD.
51 /// Bitwise logical XOR of floating point values. This corresponds
52 /// to X86::XORPS or X86::XORPD.
55 /// Bitwise logical ANDNOT of floating point values. This
56 /// corresponds to X86::ANDNPS or X86::ANDNPD.
59 /// These operations represent an abstract X86 call
60 /// instruction, which includes a bunch of information. In particular the
61 /// operands of these node are:
63 /// #0 - The incoming token chain
65 /// #2 - The number of arg bytes the caller pushes on the stack.
66 /// #3 - The number of arg bytes the callee pops off the stack.
67 /// #4 - The value to pass in AL/AX/EAX (optional)
68 /// #5 - The value to pass in DL/DX/EDX (optional)
70 /// The result values of these nodes are:
72 /// #0 - The outgoing token chain
73 /// #1 - The first register result value (optional)
74 /// #2 - The second register result value (optional)
78 /// Same as call except it adds the NoTrack prefix.
81 /// This operation implements the lowering for readcyclecounter.
84 /// X86 Read Time-Stamp Counter and Processor ID.
87 /// X86 Read Performance Monitoring Counters.
90 /// X86 compare and logical compare instructions.
93 /// X86 bit-test instructions.
96 /// X86 SetCC. Operand 0 is condition code, and operand 1 is the EFLAGS
97 /// operand, usually produced by a CMP instruction.
103 // Same as SETCC except it's materialized with a sbb and the value is all
104 // one's or all zero's.
105 SETCC_CARRY, // R = carry_bit ? ~0 : 0
107 /// X86 FP SETCC, implemented with CMP{cc}SS/CMP{cc}SD.
108 /// Operands are two FP values to compare; result is a mask of
109 /// 0s or 1s. Generally DTRT for C/C++ with NaNs.
112 /// X86 FP SETCC, similar to above, but with output as an i1 mask and
113 /// with optional rounding mode.
114 FSETCCM, FSETCCM_RND,
116 /// X86 conditional moves. Operand 0 and operand 1 are the two values
117 /// to select from. Operand 2 is the condition code, and operand 3 is the
118 /// flag operand produced by a CMP or TEST instruction. It also writes a
122 /// X86 conditional branches. Operand 0 is the chain operand, operand 1
123 /// is the block to branch if condition is true, operand 2 is the
124 /// condition code, and operand 3 is the flag operand produced by a CMP
125 /// or TEST instruction.
128 /// BRIND node with NoTrack prefix. Operand 0 is the chain operand and
129 /// operand 1 is the target address.
132 /// Return with a flag operand. Operand 0 is the chain operand, operand
133 /// 1 is the number of bytes of stack to pop.
136 /// Return from interrupt. Operand 0 is the number of bytes to pop.
139 /// Repeat fill, corresponds to X86::REP_STOSx.
142 /// Repeat move, corresponds to X86::REP_MOVSx.
145 /// On Darwin, this node represents the result of the popl
146 /// at function entry, used for PIC code.
149 /// A wrapper node for TargetConstantPool, TargetJumpTable,
150 /// TargetExternalSymbol, TargetGlobalAddress, TargetGlobalTLSAddress,
151 /// MCSymbol and TargetBlockAddress.
154 /// Special wrapper used under X86-64 PIC mode for RIP
155 /// relative displacements.
158 /// Copies a 64-bit value from the low word of an XMM vector
159 /// to an MMX vector.
162 /// Copies a 32-bit value from the low word of a MMX
166 /// Copies a GPR into the low 32-bit word of a MMX vector
167 /// and zero out the high word.
170 /// Extract an 8-bit value from a vector and zero extend it to
171 /// i32, corresponds to X86::PEXTRB.
174 /// Extract a 16-bit value from a vector and zero extend it to
175 /// i32, corresponds to X86::PEXTRW.
178 /// Insert any element of a 4 x float vector into any element
179 /// of a destination 4 x floatvector.
182 /// Insert the lower 8-bits of a 32-bit value to a vector,
183 /// corresponds to X86::PINSRB.
186 /// Insert the lower 16-bits of a 32-bit value to a vector,
187 /// corresponds to X86::PINSRW.
190 /// Shuffle 16 8-bit values within a vector.
193 /// Compute Sum of Absolute Differences.
195 /// Compute Double Block Packed Sum-Absolute-Differences
198 /// Bitwise Logical AND NOT of Packed FP values.
201 /// Blend where the selector is an immediate.
204 /// Dynamic (non-constant condition) vector blend where only the sign bits
205 /// of the condition elements are used. This is used to enforce that the
206 /// condition mask is not valid for generic VSELECT optimizations. This
207 /// can also be used to implement the intrinsics.
210 /// Combined add and sub on an FP vector.
213 // FP vector ops with rounding mode.
220 FSQRT_RND, FSQRTS_RND,
222 // FP vector get exponent.
223 FGETEXP_RND, FGETEXPS_RND,
224 // Extract Normalized Mantissas.
225 VGETMANT, VGETMANT_RND, VGETMANTS, VGETMANTS_RND,
230 // Unsigned Integer average.
233 /// Integer horizontal add/sub.
237 /// Floating point horizontal add/sub.
241 // Detect Conflicts Within a Vector
244 /// Floating point max and min.
247 /// Commutative FMIN and FMAX.
250 /// Scalar intrinsic floating point max and min.
253 /// Floating point reciprocal-sqrt and reciprocal approximation.
254 /// Note that these typically require refinement
255 /// in order to obtain suitable precision.
258 // AVX-512 reciprocal approximations with a little more precision.
259 RSQRT14, RSQRT14S, RCP14, RCP14S,
261 // Thread Local Storage.
264 // Thread Local Storage. A call to get the start address
265 // of the TLS block for the current module.
268 // Thread Local Storage. When calling to an OS provided
269 // thunk at the address from an earlier relocation.
272 // Exception Handling helpers.
275 // SjLj exception handling setjmp.
278 // SjLj exception handling longjmp.
281 // SjLj exception handling dispatch.
282 EH_SJLJ_SETUP_DISPATCH,
284 /// Tail call return. See X86TargetLowering::LowerCall for
285 /// the list of operands.
288 // Vector move to low scalar and zero higher vector elements.
291 // Vector integer truncate.
293 // Vector integer truncate with unsigned/signed saturation.
296 // Masked version of the above. Used when less than a 128-bit result is
297 // produced since the mask only applies to the lower elements and can't
298 // be represented by a select.
299 // SRC, PASSTHRU, MASK
300 VMTRUNC, VMTRUNCUS, VMTRUNCS,
303 VFPEXT, VFPEXT_RND, VFPEXTS_RND,
306 VFPROUND, VFPROUND_RND, VFPROUNDS_RND,
308 // Masked version of above. Used for v2f64->v4f32.
309 // SRC, PASSTHRU, MASK
312 // 128-bit vector logical left / right shift
315 // Vector shift elements
318 // Vector variable shift
321 // Vector shift elements by immediate
324 // Shifts of mask registers.
327 // Bit rotate by immediate
330 // Vector packed double/float comparison.
333 // Vector integer comparisons.
336 // v8i16 Horizontal minimum and position.
341 /// Vector comparison generating mask bits for fp and
342 /// integer signed and unsigned data types.
344 // Vector comparison with rounding mode for FP values
347 // Arithmetic operations with FLAGS results.
348 ADD, SUB, ADC, SBB, SMUL, UMUL,
351 // Bit field extract.
354 // Zero High Bits Starting with Specified Bit Position.
357 // X86-specific multiply by immediate.
360 // Vector sign bit extraction.
363 // Vector bitwise comparisons.
366 // Vector packed fp sign bitwise comparisons.
369 // OR/AND test for masks.
376 // Several flavors of instructions with vector shuffle behaviors.
377 // Saturated signed/unnsigned packing.
380 // Intra-lane alignr.
382 // AVX512 inter-lane alignr.
388 // VBMI2 Concat & Shift.
393 //Shuffle Packed Values at 128-bit granularity.
409 // Variable Permute (VPERM).
410 // Res = VPERMV MaskV, V0
413 // 3-op Variable Permute (VPERMT2).
414 // Res = VPERMV3 V0, MaskV, V1
417 // Bitwise ternary logic.
419 // Fix Up Special Packed Float32/64 values.
422 // Range Restriction Calculation For Packed Pairs of Float32/64 values.
423 VRANGE, VRANGE_RND, VRANGES, VRANGES_RND,
424 // Reduce - Perform Reduction Transformation on scalar\packed FP.
425 VREDUCE, VREDUCE_RND, VREDUCES, VREDUCES_RND,
426 // RndScale - Round FP Values To Include A Given Number Of Fraction Bits.
427 // Also used by the legacy (V)ROUND intrinsics where we mask out the
428 // scaling part of the immediate.
429 VRNDSCALE, VRNDSCALE_RND, VRNDSCALES, VRNDSCALES_RND,
430 // Tests Types Of a FP Values for packed types.
432 // Tests Types Of a FP Values for scalar types.
435 // Broadcast scalar to vector.
437 // Broadcast mask to vector.
439 // Broadcast subvector to vector.
442 /// SSE4A Extraction and Insertion.
445 // XOP arithmetic/logical shifts.
447 // XOP signed/unsigned integer comparisons.
449 // XOP packed permute bytes.
451 // XOP two source permutation.
454 // Vector multiply packed unsigned doubleword integers.
456 // Vector multiply packed signed doubleword integers.
458 // Vector Multiply Packed UnsignedIntegers with Round and Scale.
461 // Multiply and Add Packed Integers.
462 VPMADDUBSW, VPMADDWD,
464 // AVX512IFMA multiply and add.
465 // NOTE: These are different than the instruction and perform
467 VPMADD52L, VPMADD52H,
476 // We use the target independent ISD::FMA for the non-inverted case.
483 // FMA with rounding mode.
491 // Compress and expand.
498 // Convert Unsigned/Integer to Floating-Point Value with rounding mode.
499 SINT_TO_FP_RND, UINT_TO_FP_RND,
500 SCALAR_SINT_TO_FP_RND, SCALAR_UINT_TO_FP_RND,
502 // Vector float/double to signed/unsigned integer.
503 CVTP2SI, CVTP2UI, CVTP2SI_RND, CVTP2UI_RND,
504 // Scalar float/double to signed/unsigned integer.
505 CVTS2SI, CVTS2UI, CVTS2SI_RND, CVTS2UI_RND,
507 // Vector float/double to signed/unsigned integer with truncation.
508 CVTTP2SI, CVTTP2UI, CVTTP2SI_RND, CVTTP2UI_RND,
509 // Scalar float/double to signed/unsigned integer with truncation.
510 CVTTS2SI, CVTTS2UI, CVTTS2SI_RND, CVTTS2UI_RND,
512 // Vector signed/unsigned integer to float/double.
515 // Masked versions of above. Used for v2f64->v4f32.
516 // SRC, PASSTHRU, MASK
517 MCVTP2SI, MCVTP2UI, MCVTTP2SI, MCVTTP2UI,
519 // Save xmm argument registers to the stack, according to %al. An operator
520 // is needed so that this can be expanded with control flow.
521 VASTART_SAVE_XMM_REGS,
523 // Windows's _chkstk call to do stack probing.
526 // For allocating variable amounts of stack space when using
527 // segmented stacks. Check if the current stacklet has enough space, and
528 // falls back to heap allocation if not.
535 // Store FP status word into i16 register.
538 // Store contents of %ah into %eflags.
541 // Get a random integer and indicate whether it is valid in CF.
544 // Get a NIST SP800-90B & C compliant random integer and
545 // indicate whether it is valid in CF.
548 // SSE42 string comparisons.
549 // These nodes produce 3 results, index, mask, and flags. X86ISelDAGToDAG
550 // will emit one or two instructions based on which results are used. If
551 // flags and index/mask this allows us to use a single instruction since
552 // we won't have to pick and opcode for flags. Instead we can rely on the
553 // DAG to CSE everything and decide at isel.
557 // Test if in transactional execution.
561 RSQRT28, RSQRT28S, RCP28, RCP28S, EXP2,
563 // Conversions between float and half-float.
564 CVTPS2PH, CVTPH2PS, CVTPH2PS_RND,
566 // Masked version of above.
567 // SRC, RND, PASSTHRU, MASK
570 // Galois Field Arithmetic Instructions
571 GF2P8AFFINEINVQB, GF2P8AFFINEQB, GF2P8MULB,
573 // LWP insert record.
580 LCMPXCHG_DAG = ISD::FIRST_TARGET_MEMORY_OPCODE,
583 LCMPXCHG8_SAVE_EBX_DAG,
584 LCMPXCHG16_SAVE_RBX_DAG,
586 /// LOCK-prefixed arithmetic read-modify-write instructions.
587 /// EFLAGS, OUTCHAIN = LADD(INCHAIN, PTR, RHS)
588 LADD, LSUB, LOR, LXOR, LAND,
590 // Load, scalar_to_vector, and zero extend.
593 // Store FP control world into i16 memory.
596 /// This instruction implements FP_TO_SINT with the
597 /// integer destination in memory and a FP reg source. This corresponds
598 /// to the X86::FIST*m instructions and the rounding mode change stuff. It
599 /// has two inputs (token chain and address) and two outputs (int value
600 /// and token chain).
605 /// This instruction implements SINT_TO_FP with the
606 /// integer source in memory and FP reg result. This corresponds to the
607 /// X86::FILD*m instructions. It has three inputs (token chain, address,
608 /// and source type) and two outputs (FP value and token chain). FILD_FLAG
609 /// also produces a flag).
613 /// This instruction implements an extending load to FP stack slots.
614 /// This corresponds to the X86::FLD32m / X86::FLD64m. It takes a chain
615 /// operand, ptr to load from, and a ValueType node indicating the type
619 /// This instruction implements a truncating store to FP stack
620 /// slots. This corresponds to the X86::FST32m / X86::FST64m. It takes a
621 /// chain operand, value to store, address, and a ValueType to store it
625 /// This instruction grabs the address of the next argument
626 /// from a va_list. (reads and modifies the va_list in memory)
629 // Vector truncating store with unsigned/signed saturation
630 VTRUNCSTOREUS, VTRUNCSTORES,
631 // Vector truncating masked store with unsigned/signed saturation
632 VMTRUNCSTOREUS, VMTRUNCSTORES,
634 // X86 specific gather and scatter
637 // WARNING: Do not add anything in the end unless you want the node to
638 // have memop! In fact, starting from FIRST_TARGET_MEMORY_OPCODE all
639 // opcodes will be thought as target memory ops!
641 } // end namespace X86ISD
643 /// Define some predicates that are used for node matching.
645 /// Returns true if Elt is a constant zero or floating point constant +0.0.
646 bool isZeroNode(SDValue Elt);
648 /// Returns true of the given offset can be
649 /// fit into displacement field of the instruction.
650 bool isOffsetSuitableForCodeModel(int64_t Offset, CodeModel::Model M,
651 bool hasSymbolicDisplacement = true);
653 /// Determines whether the callee is required to pop its
654 /// own arguments. Callee pop is necessary to support tail calls.
655 bool isCalleePop(CallingConv::ID CallingConv,
656 bool is64Bit, bool IsVarArg, bool GuaranteeTCO);
658 } // end namespace X86
660 //===--------------------------------------------------------------------===//
661 // X86 Implementation of the TargetLowering interface
662 class X86TargetLowering final : public TargetLowering {
664 explicit X86TargetLowering(const X86TargetMachine &TM,
665 const X86Subtarget &STI);
667 unsigned getJumpTableEncoding() const override;
668 bool useSoftFloat() const override;
670 void markLibCallAttributes(MachineFunction *MF, unsigned CC,
671 ArgListTy &Args) const override;
673 MVT getScalarShiftAmountTy(const DataLayout &, EVT VT) const override {
678 LowerCustomJumpTableEntry(const MachineJumpTableInfo *MJTI,
679 const MachineBasicBlock *MBB, unsigned uid,
680 MCContext &Ctx) const override;
682 /// Returns relocation base for the given PIC jumptable.
683 SDValue getPICJumpTableRelocBase(SDValue Table,
684 SelectionDAG &DAG) const override;
686 getPICJumpTableRelocBaseExpr(const MachineFunction *MF,
687 unsigned JTI, MCContext &Ctx) const override;
689 /// Return the desired alignment for ByVal aggregate
690 /// function arguments in the caller parameter area. For X86, aggregates
691 /// that contains are placed at 16-byte boundaries while the rest are at
692 /// 4-byte boundaries.
693 unsigned getByValTypeAlignment(Type *Ty,
694 const DataLayout &DL) const override;
696 /// Returns the target specific optimal type for load
697 /// and store operations as a result of memset, memcpy, and memmove
698 /// lowering. If DstAlign is zero that means it's safe to destination
699 /// alignment can satisfy any constraint. Similarly if SrcAlign is zero it
700 /// means there isn't a need to check it against alignment requirement,
701 /// probably because the source does not need to be loaded. If 'IsMemset' is
702 /// true, that means it's expanding a memset. If 'ZeroMemset' is true, that
703 /// means it's a memset of zero. 'MemcpyStrSrc' indicates whether the memcpy
704 /// source is constant so it does not need to be loaded.
705 /// It returns EVT::Other if the type should be determined using generic
706 /// target-independent logic.
707 EVT getOptimalMemOpType(uint64_t Size, unsigned DstAlign, unsigned SrcAlign,
708 bool IsMemset, bool ZeroMemset, bool MemcpyStrSrc,
709 MachineFunction &MF) const override;
711 /// Returns true if it's safe to use load / store of the
712 /// specified type to expand memcpy / memset inline. This is mostly true
713 /// for all types except for some special cases. For example, on X86
714 /// targets without SSE2 f64 load / store are done with fldl / fstpl which
715 /// also does type conversion. Note the specified type doesn't have to be
716 /// legal as the hook is used before type legalization.
717 bool isSafeMemOpType(MVT VT) const override;
719 /// Returns true if the target allows unaligned memory accesses of the
720 /// specified type. Returns whether it is "fast" in the last argument.
721 bool allowsMisalignedMemoryAccesses(EVT VT, unsigned AS, unsigned Align,
722 bool *Fast) const override;
724 /// Provide custom lowering hooks for some operations.
726 SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const override;
728 /// Places new result values for the node in Results (their number
729 /// and types must exactly match those of the original return values of
730 /// the node), or leaves Results empty, which indicates that the node is not
731 /// to be custom lowered after all.
732 void LowerOperationWrapper(SDNode *N,
733 SmallVectorImpl<SDValue> &Results,
734 SelectionDAG &DAG) const override;
736 /// Replace the results of node with an illegal result
737 /// type with new values built out of custom code.
739 void ReplaceNodeResults(SDNode *N, SmallVectorImpl<SDValue>&Results,
740 SelectionDAG &DAG) const override;
742 SDValue PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const override;
744 // Return true if it is profitable to combine a BUILD_VECTOR with a
745 // stride-pattern to a shuffle and a truncate.
746 // Example of such a combine:
747 // v4i32 build_vector((extract_elt V, 1),
748 // (extract_elt V, 3),
749 // (extract_elt V, 5),
750 // (extract_elt V, 7))
752 // v4i32 truncate (bitcast (shuffle<1,u,3,u,4,u,5,u,6,u,7,u> V, u) to
754 bool isDesirableToCombineBuildVectorToShuffleTruncate(
755 ArrayRef<int> ShuffleMask, EVT SrcVT, EVT TruncVT) const override;
757 /// Return true if the target has native support for
758 /// the specified value type and it is 'desirable' to use the type for the
759 /// given node type. e.g. On x86 i16 is legal, but undesirable since i16
760 /// instruction encodings are longer and some i16 instructions are slow.
761 bool isTypeDesirableForOp(unsigned Opc, EVT VT) const override;
763 /// Return true if the target has native support for the
764 /// specified value type and it is 'desirable' to use the type. e.g. On x86
765 /// i16 is legal, but undesirable since i16 instruction encodings are longer
766 /// and some i16 instructions are slow.
767 bool IsDesirableToPromoteOp(SDValue Op, EVT &PVT) const override;
770 EmitInstrWithCustomInserter(MachineInstr &MI,
771 MachineBasicBlock *MBB) const override;
773 /// This method returns the name of a target specific DAG node.
774 const char *getTargetNodeName(unsigned Opcode) const override;
776 bool mergeStoresAfterLegalization() const override { return true; }
778 bool canMergeStoresTo(unsigned AddressSpace, EVT MemVT,
779 const SelectionDAG &DAG) const override;
781 bool isCheapToSpeculateCttz() const override;
783 bool isCheapToSpeculateCtlz() const override;
785 bool isCtlzFast() const override;
787 bool hasBitPreservingFPLogic(EVT VT) const override {
788 return VT == MVT::f32 || VT == MVT::f64 || VT.isVector();
791 bool isMultiStoresCheaperThanBitsMerge(EVT LTy, EVT HTy) const override {
792 // If the pair to store is a mixture of float and int values, we will
793 // save two bitwise instructions and one float-to-int instruction and
794 // increase one store instruction. There is potentially a more
795 // significant benefit because it avoids the float->int domain switch
796 // for input value. So It is more likely a win.
797 if ((LTy.isFloatingPoint() && HTy.isInteger()) ||
798 (LTy.isInteger() && HTy.isFloatingPoint()))
800 // If the pair only contains int values, we will save two bitwise
801 // instructions and increase one store instruction (costing one more
802 // store buffer). Since the benefit is more blurred so we leave
803 // such pair out until we get testcase to prove it is a win.
807 bool isMaskAndCmp0FoldingBeneficial(const Instruction &AndI) const override;
809 bool hasAndNotCompare(SDValue Y) const override;
811 bool hasAndNot(SDValue Y) const override;
813 bool preferShiftsToClearExtremeBits(SDValue Y) const override;
816 shouldTransformSignedTruncationCheck(EVT XVT,
817 unsigned KeptBits) const override {
818 // For vectors, we don't have a preference..
822 auto VTIsOk = [](EVT VT) -> bool {
823 return VT == MVT::i8 || VT == MVT::i16 || VT == MVT::i32 ||
827 // We are ok with KeptBitsVT being byte/word/dword, what MOVS supports.
828 // XVT will be larger than KeptBitsVT.
829 MVT KeptBitsVT = MVT::getIntegerVT(KeptBits);
830 return VTIsOk(XVT) && VTIsOk(KeptBitsVT);
833 bool shouldSplatInsEltVarIndex(EVT VT) const override;
835 bool convertSetCCLogicToBitwiseLogic(EVT VT) const override {
836 return VT.isScalarInteger();
839 /// Vector-sized comparisons are fast using PCMPEQ + PMOVMSK or PTEST.
840 MVT hasFastEqualityCompare(unsigned NumBits) const override;
842 /// Allow multiple load pairs per block for smaller and faster code.
843 unsigned getMemcmpEqZeroLoadsPerBlock() const override {
847 /// Return the value type to use for ISD::SETCC.
848 EVT getSetCCResultType(const DataLayout &DL, LLVMContext &Context,
849 EVT VT) const override;
851 bool targetShrinkDemandedConstant(SDValue Op, const APInt &Demanded,
852 TargetLoweringOpt &TLO) const override;
854 /// Determine which of the bits specified in Mask are known to be either
855 /// zero or one and return them in the KnownZero/KnownOne bitsets.
856 void computeKnownBitsForTargetNode(const SDValue Op,
858 const APInt &DemandedElts,
859 const SelectionDAG &DAG,
860 unsigned Depth = 0) const override;
862 /// Determine the number of bits in the operation that are sign bits.
863 unsigned ComputeNumSignBitsForTargetNode(SDValue Op,
864 const APInt &DemandedElts,
865 const SelectionDAG &DAG,
866 unsigned Depth) const override;
868 bool SimplifyDemandedVectorEltsForTargetNode(SDValue Op,
869 const APInt &DemandedElts,
872 TargetLoweringOpt &TLO,
873 unsigned Depth) const override;
875 bool SimplifyDemandedBitsForTargetNode(SDValue Op,
876 const APInt &DemandedBits,
877 const APInt &DemandedElts,
879 TargetLoweringOpt &TLO,
880 unsigned Depth) const override;
882 SDValue unwrapAddress(SDValue N) const override;
884 SDValue getReturnAddressFrameIndex(SelectionDAG &DAG) const;
886 bool ExpandInlineAsm(CallInst *CI) const override;
888 ConstraintType getConstraintType(StringRef Constraint) const override;
890 /// Examine constraint string and operand type and determine a weight value.
891 /// The operand object must already have been set up with the operand type.
893 getSingleConstraintMatchWeight(AsmOperandInfo &info,
894 const char *constraint) const override;
896 const char *LowerXConstraint(EVT ConstraintVT) const override;
898 /// Lower the specified operand into the Ops vector. If it is invalid, don't
899 /// add anything to Ops. If hasMemory is true it means one of the asm
900 /// constraint of the inline asm instruction being processed is 'm'.
901 void LowerAsmOperandForConstraint(SDValue Op,
902 std::string &Constraint,
903 std::vector<SDValue> &Ops,
904 SelectionDAG &DAG) const override;
907 getInlineAsmMemConstraint(StringRef ConstraintCode) const override {
908 if (ConstraintCode == "i")
909 return InlineAsm::Constraint_i;
910 else if (ConstraintCode == "o")
911 return InlineAsm::Constraint_o;
912 else if (ConstraintCode == "v")
913 return InlineAsm::Constraint_v;
914 else if (ConstraintCode == "X")
915 return InlineAsm::Constraint_X;
916 return TargetLowering::getInlineAsmMemConstraint(ConstraintCode);
919 /// Given a physical register constraint
920 /// (e.g. {edx}), return the register number and the register class for the
921 /// register. This should only be used for C_Register constraints. On
922 /// error, this returns a register number of 0.
923 std::pair<unsigned, const TargetRegisterClass *>
924 getRegForInlineAsmConstraint(const TargetRegisterInfo *TRI,
925 StringRef Constraint, MVT VT) const override;
927 /// Return true if the addressing mode represented
928 /// by AM is legal for this target, for a load/store of the specified type.
929 bool isLegalAddressingMode(const DataLayout &DL, const AddrMode &AM,
930 Type *Ty, unsigned AS,
931 Instruction *I = nullptr) const override;
933 /// Return true if the specified immediate is legal
934 /// icmp immediate, that is the target has icmp instructions which can
935 /// compare a register against the immediate without having to materialize
936 /// the immediate into a register.
937 bool isLegalICmpImmediate(int64_t Imm) const override;
939 /// Return true if the specified immediate is legal
940 /// add immediate, that is the target has add instructions which can
941 /// add a register and the immediate without having to materialize
942 /// the immediate into a register.
943 bool isLegalAddImmediate(int64_t Imm) const override;
945 bool isLegalStoreImmediate(int64_t Imm) const override;
947 /// Return the cost of the scaling factor used in the addressing
948 /// mode represented by AM for this target, for a load/store
949 /// of the specified type.
950 /// If the AM is supported, the return value must be >= 0.
951 /// If the AM is not supported, it returns a negative value.
952 int getScalingFactorCost(const DataLayout &DL, const AddrMode &AM, Type *Ty,
953 unsigned AS) const override;
955 bool isVectorShiftByScalarCheap(Type *Ty) const override;
957 /// Return true if it's free to truncate a value of
958 /// type Ty1 to type Ty2. e.g. On x86 it's free to truncate a i32 value in
959 /// register EAX to i16 by referencing its sub-register AX.
960 bool isTruncateFree(Type *Ty1, Type *Ty2) const override;
961 bool isTruncateFree(EVT VT1, EVT VT2) const override;
963 bool allowTruncateForTailCall(Type *Ty1, Type *Ty2) const override;
965 /// Return true if any actual instruction that defines a
966 /// value of type Ty1 implicit zero-extends the value to Ty2 in the result
967 /// register. This does not necessarily include registers defined in
968 /// unknown ways, such as incoming arguments, or copies from unknown
969 /// virtual registers. Also, if isTruncateFree(Ty2, Ty1) is true, this
970 /// does not necessarily apply to truncate instructions. e.g. on x86-64,
971 /// all instructions that define 32-bit values implicit zero-extend the
972 /// result out to 64 bits.
973 bool isZExtFree(Type *Ty1, Type *Ty2) const override;
974 bool isZExtFree(EVT VT1, EVT VT2) const override;
975 bool isZExtFree(SDValue Val, EVT VT2) const override;
977 /// Return true if folding a vector load into ExtVal (a sign, zero, or any
978 /// extend node) is profitable.
979 bool isVectorLoadExtDesirable(SDValue) const override;
981 /// Return true if an FMA operation is faster than a pair of fmul and fadd
982 /// instructions. fmuladd intrinsics will be expanded to FMAs when this
983 /// method returns true, otherwise fmuladd is expanded to fmul + fadd.
984 bool isFMAFasterThanFMulAndFAdd(EVT VT) const override;
986 /// Return true if it's profitable to narrow
987 /// operations of type VT1 to VT2. e.g. on x86, it's profitable to narrow
988 /// from i32 to i8 but not from i32 to i16.
989 bool isNarrowingProfitable(EVT VT1, EVT VT2) const override;
991 /// Given an intrinsic, checks if on the target the intrinsic will need to map
992 /// to a MemIntrinsicNode (touches memory). If this is the case, it returns
993 /// true and stores the intrinsic information into the IntrinsicInfo that was
994 /// passed to the function.
995 bool getTgtMemIntrinsic(IntrinsicInfo &Info, const CallInst &I,
997 unsigned Intrinsic) const override;
999 /// Returns true if the target can instruction select the
1000 /// specified FP immediate natively. If false, the legalizer will
1001 /// materialize the FP immediate as a load from a constant pool.
1002 bool isFPImmLegal(const APFloat &Imm, EVT VT) const override;
1004 /// Targets can use this to indicate that they only support *some*
1005 /// VECTOR_SHUFFLE operations, those with specific masks. By default, if a
1006 /// target supports the VECTOR_SHUFFLE node, all mask values are assumed to
1008 bool isShuffleMaskLegal(ArrayRef<int> Mask, EVT VT) const override;
1010 /// Similar to isShuffleMaskLegal. Targets can use this to indicate if there
1011 /// is a suitable VECTOR_SHUFFLE that can be used to replace a VAND with a
1012 /// constant pool entry.
1013 bool isVectorClearMaskLegal(ArrayRef<int> Mask, EVT VT) const override;
1015 /// Returns true if lowering to a jump table is allowed.
1016 bool areJTsAllowed(const Function *Fn) const override;
1018 /// If true, then instruction selection should
1019 /// seek to shrink the FP constant of the specified type to a smaller type
1020 /// in order to save space and / or reduce runtime.
1021 bool ShouldShrinkFPConstant(EVT VT) const override {
1022 // Don't shrink FP constpool if SSE2 is available since cvtss2sd is more
1023 // expensive than a straight movsd. On the other hand, it's important to
1024 // shrink long double fp constant since fldt is very slow.
1025 return !X86ScalarSSEf64 || VT == MVT::f80;
1028 /// Return true if we believe it is correct and profitable to reduce the
1029 /// load node to a smaller type.
1030 bool shouldReduceLoadWidth(SDNode *Load, ISD::LoadExtType ExtTy,
1031 EVT NewVT) const override;
1033 /// Return true if the specified scalar FP type is computed in an SSE
1034 /// register, not on the X87 floating point stack.
1035 bool isScalarFPTypeInSSEReg(EVT VT) const {
1036 return (VT == MVT::f64 && X86ScalarSSEf64) || // f64 is when SSE2
1037 (VT == MVT::f32 && X86ScalarSSEf32); // f32 is when SSE1
1040 /// Returns true if it is beneficial to convert a load of a constant
1041 /// to just the constant itself.
1042 bool shouldConvertConstantLoadToIntImm(const APInt &Imm,
1043 Type *Ty) const override;
1045 bool reduceSelectOfFPConstantLoads(bool IsFPSetCC) const override;
1047 bool convertSelectOfConstantsToMath(EVT VT) const override;
1049 bool decomposeMulByConstant(EVT VT, SDValue C) const override;
1051 bool shouldUseStrictFP_TO_INT(EVT FpVT, EVT IntVT,
1052 bool IsSigned) const override;
1054 /// Return true if EXTRACT_SUBVECTOR is cheap for this result type
1055 /// with this index.
1056 bool isExtractSubvectorCheap(EVT ResVT, EVT SrcVT,
1057 unsigned Index) const override;
1059 /// Scalar ops always have equal or better analysis/performance/power than
1060 /// the vector equivalent, so this always makes sense if the scalar op is
1062 bool shouldScalarizeBinop(SDValue) const override;
1064 bool storeOfVectorConstantIsCheap(EVT MemVT, unsigned NumElem,
1065 unsigned AddrSpace) const override {
1066 // If we can replace more than 2 scalar stores, there will be a reduction
1067 // in instructions even after we add a vector constant load.
1071 bool isLoadBitCastBeneficial(EVT LoadVT, EVT BitcastVT) const override;
1073 /// Intel processors have a unified instruction and data cache
1074 const char * getClearCacheBuiltinName() const override {
1075 return nullptr; // nothing to do, move along.
1078 unsigned getRegisterByName(const char* RegName, EVT VT,
1079 SelectionDAG &DAG) const override;
1081 /// If a physical register, this returns the register that receives the
1082 /// exception address on entry to an EH pad.
1084 getExceptionPointerRegister(const Constant *PersonalityFn) const override;
1086 /// If a physical register, this returns the register that receives the
1087 /// exception typeid on entry to a landing pad.
1089 getExceptionSelectorRegister(const Constant *PersonalityFn) const override;
1091 virtual bool needsFixedCatchObjects() const override;
1093 /// This method returns a target specific FastISel object,
1094 /// or null if the target does not support "fast" ISel.
1095 FastISel *createFastISel(FunctionLoweringInfo &funcInfo,
1096 const TargetLibraryInfo *libInfo) const override;
1098 /// If the target has a standard location for the stack protector cookie,
1099 /// returns the address of that location. Otherwise, returns nullptr.
1100 Value *getIRStackGuard(IRBuilder<> &IRB) const override;
1102 bool useLoadStackGuardNode() const override;
1103 bool useStackGuardXorFP() const override;
1104 void insertSSPDeclarations(Module &M) const override;
1105 Value *getSDagStackGuard(const Module &M) const override;
1106 Value *getSSPStackGuardCheck(const Module &M) const override;
1107 SDValue emitStackGuardXorFP(SelectionDAG &DAG, SDValue Val,
1108 const SDLoc &DL) const override;
1111 /// Return true if the target stores SafeStack pointer at a fixed offset in
1112 /// some non-standard address space, and populates the address space and
1113 /// offset as appropriate.
1114 Value *getSafeStackPointerLocation(IRBuilder<> &IRB) const override;
1116 SDValue BuildFILD(SDValue Op, EVT SrcVT, SDValue Chain, SDValue StackSlot,
1117 SelectionDAG &DAG) const;
1119 bool isNoopAddrSpaceCast(unsigned SrcAS, unsigned DestAS) const override;
1121 /// Customize the preferred legalization strategy for certain types.
1122 LegalizeTypeAction getPreferredVectorAction(MVT VT) const override;
1124 MVT getRegisterTypeForCallingConv(LLVMContext &Context, CallingConv::ID CC,
1125 EVT VT) const override;
1127 unsigned getNumRegistersForCallingConv(LLVMContext &Context,
1129 EVT VT) const override;
1131 bool isIntDivCheap(EVT VT, AttributeList Attr) const override;
1133 bool supportSwiftError() const override;
1135 StringRef getStackProbeSymbolName(MachineFunction &MF) const override;
1137 bool hasVectorBlend() const override { return true; }
1139 unsigned getMaxSupportedInterleaveFactor() const override { return 4; }
1141 /// Lower interleaved load(s) into target specific
1142 /// instructions/intrinsics.
1143 bool lowerInterleavedLoad(LoadInst *LI,
1144 ArrayRef<ShuffleVectorInst *> Shuffles,
1145 ArrayRef<unsigned> Indices,
1146 unsigned Factor) const override;
1148 /// Lower interleaved store(s) into target specific
1149 /// instructions/intrinsics.
1150 bool lowerInterleavedStore(StoreInst *SI, ShuffleVectorInst *SVI,
1151 unsigned Factor) const override;
1153 SDValue expandIndirectJTBranch(const SDLoc& dl, SDValue Value,
1154 SDValue Addr, SelectionDAG &DAG)
1158 std::pair<const TargetRegisterClass *, uint8_t>
1159 findRepresentativeClass(const TargetRegisterInfo *TRI,
1160 MVT VT) const override;
1163 /// Keep a reference to the X86Subtarget around so that we can
1164 /// make the right decision when generating code for different targets.
1165 const X86Subtarget &Subtarget;
1167 /// Select between SSE or x87 floating point ops.
1168 /// When SSE is available, use it for f32 operations.
1169 /// When SSE2 is available, use it for f64 operations.
1170 bool X86ScalarSSEf32;
1171 bool X86ScalarSSEf64;
1173 /// A list of legal FP immediates.
1174 std::vector<APFloat> LegalFPImmediates;
1176 /// Indicate that this x86 target can instruction
1177 /// select the specified FP immediate natively.
1178 void addLegalFPImmediate(const APFloat& Imm) {
1179 LegalFPImmediates.push_back(Imm);
1182 SDValue LowerCallResult(SDValue Chain, SDValue InFlag,
1183 CallingConv::ID CallConv, bool isVarArg,
1184 const SmallVectorImpl<ISD::InputArg> &Ins,
1185 const SDLoc &dl, SelectionDAG &DAG,
1186 SmallVectorImpl<SDValue> &InVals,
1187 uint32_t *RegMask) const;
1188 SDValue LowerMemArgument(SDValue Chain, CallingConv::ID CallConv,
1189 const SmallVectorImpl<ISD::InputArg> &ArgInfo,
1190 const SDLoc &dl, SelectionDAG &DAG,
1191 const CCValAssign &VA, MachineFrameInfo &MFI,
1193 SDValue LowerMemOpCallTo(SDValue Chain, SDValue StackPtr, SDValue Arg,
1194 const SDLoc &dl, SelectionDAG &DAG,
1195 const CCValAssign &VA,
1196 ISD::ArgFlagsTy Flags) const;
1198 // Call lowering helpers.
1200 /// Check whether the call is eligible for tail call optimization. Targets
1201 /// that want to do tail call optimization should implement this function.
1202 bool IsEligibleForTailCallOptimization(SDValue Callee,
1203 CallingConv::ID CalleeCC,
1205 bool isCalleeStructRet,
1206 bool isCallerStructRet,
1208 const SmallVectorImpl<ISD::OutputArg> &Outs,
1209 const SmallVectorImpl<SDValue> &OutVals,
1210 const SmallVectorImpl<ISD::InputArg> &Ins,
1211 SelectionDAG& DAG) const;
1212 SDValue EmitTailCallLoadRetAddr(SelectionDAG &DAG, SDValue &OutRetAddr,
1213 SDValue Chain, bool IsTailCall,
1214 bool Is64Bit, int FPDiff,
1215 const SDLoc &dl) const;
1217 unsigned GetAlignedArgumentStackSize(unsigned StackSize,
1218 SelectionDAG &DAG) const;
1220 unsigned getAddressSpace(void) const;
1222 std::pair<SDValue,SDValue> FP_TO_INTHelper(SDValue Op, SelectionDAG &DAG,
1224 bool isReplace) const;
1226 SDValue LowerBUILD_VECTOR(SDValue Op, SelectionDAG &DAG) const;
1227 SDValue LowerVSELECT(SDValue Op, SelectionDAG &DAG) const;
1228 SDValue LowerEXTRACT_VECTOR_ELT(SDValue Op, SelectionDAG &DAG) const;
1229 SDValue LowerINSERT_VECTOR_ELT(SDValue Op, SelectionDAG &DAG) const;
1231 unsigned getGlobalWrapperKind(const GlobalValue *GV = nullptr,
1232 const unsigned char OpFlags = 0) const;
1233 SDValue LowerConstantPool(SDValue Op, SelectionDAG &DAG) const;
1234 SDValue LowerBlockAddress(SDValue Op, SelectionDAG &DAG) const;
1235 SDValue LowerGlobalAddress(const GlobalValue *GV, const SDLoc &dl,
1236 int64_t Offset, SelectionDAG &DAG) const;
1237 SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const;
1238 SDValue LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const;
1239 SDValue LowerExternalSymbol(SDValue Op, SelectionDAG &DAG) const;
1241 SDValue LowerSINT_TO_FP(SDValue Op, SelectionDAG &DAG) const;
1242 SDValue LowerUINT_TO_FP(SDValue Op, SelectionDAG &DAG) const;
1243 SDValue LowerTRUNCATE(SDValue Op, SelectionDAG &DAG) const;
1244 SDValue LowerFP_TO_INT(SDValue Op, SelectionDAG &DAG) const;
1245 SDValue LowerSETCC(SDValue Op, SelectionDAG &DAG) const;
1246 SDValue LowerSETCCCARRY(SDValue Op, SelectionDAG &DAG) const;
1247 SDValue LowerSELECT(SDValue Op, SelectionDAG &DAG) const;
1248 SDValue LowerBRCOND(SDValue Op, SelectionDAG &DAG) const;
1249 SDValue LowerJumpTable(SDValue Op, SelectionDAG &DAG) const;
1250 SDValue LowerDYNAMIC_STACKALLOC(SDValue Op, SelectionDAG &DAG) const;
1251 SDValue LowerVASTART(SDValue Op, SelectionDAG &DAG) const;
1252 SDValue LowerVAARG(SDValue Op, SelectionDAG &DAG) const;
1253 SDValue LowerRETURNADDR(SDValue Op, SelectionDAG &DAG) const;
1254 SDValue LowerADDROFRETURNADDR(SDValue Op, SelectionDAG &DAG) const;
1255 SDValue LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const;
1256 SDValue LowerFRAME_TO_ARGS_OFFSET(SDValue Op, SelectionDAG &DAG) const;
1257 SDValue LowerEH_RETURN(SDValue Op, SelectionDAG &DAG) const;
1258 SDValue lowerEH_SJLJ_SETJMP(SDValue Op, SelectionDAG &DAG) const;
1259 SDValue lowerEH_SJLJ_LONGJMP(SDValue Op, SelectionDAG &DAG) const;
1260 SDValue lowerEH_SJLJ_SETUP_DISPATCH(SDValue Op, SelectionDAG &DAG) const;
1261 SDValue LowerINIT_TRAMPOLINE(SDValue Op, SelectionDAG &DAG) const;
1262 SDValue LowerFLT_ROUNDS_(SDValue Op, SelectionDAG &DAG) const;
1263 SDValue LowerWin64_i128OP(SDValue Op, SelectionDAG &DAG) const;
1264 SDValue LowerGC_TRANSITION_START(SDValue Op, SelectionDAG &DAG) const;
1265 SDValue LowerGC_TRANSITION_END(SDValue Op, SelectionDAG &DAG) const;
1266 SDValue LowerINTRINSIC_WO_CHAIN(SDValue Op, SelectionDAG &DAG) const;
1269 LowerFormalArguments(SDValue Chain, CallingConv::ID CallConv, bool isVarArg,
1270 const SmallVectorImpl<ISD::InputArg> &Ins,
1271 const SDLoc &dl, SelectionDAG &DAG,
1272 SmallVectorImpl<SDValue> &InVals) const override;
1273 SDValue LowerCall(CallLoweringInfo &CLI,
1274 SmallVectorImpl<SDValue> &InVals) const override;
1276 SDValue LowerReturn(SDValue Chain, CallingConv::ID CallConv, bool isVarArg,
1277 const SmallVectorImpl<ISD::OutputArg> &Outs,
1278 const SmallVectorImpl<SDValue> &OutVals,
1279 const SDLoc &dl, SelectionDAG &DAG) const override;
1281 bool supportSplitCSR(MachineFunction *MF) const override {
1282 return MF->getFunction().getCallingConv() == CallingConv::CXX_FAST_TLS &&
1283 MF->getFunction().hasFnAttribute(Attribute::NoUnwind);
1285 void initializeSplitCSR(MachineBasicBlock *Entry) const override;
1286 void insertCopiesSplitCSR(
1287 MachineBasicBlock *Entry,
1288 const SmallVectorImpl<MachineBasicBlock *> &Exits) const override;
1290 bool isUsedByReturnOnly(SDNode *N, SDValue &Chain) const override;
1292 bool mayBeEmittedAsTailCall(const CallInst *CI) const override;
1294 EVT getTypeForExtReturn(LLVMContext &Context, EVT VT,
1295 ISD::NodeType ExtendKind) const override;
1297 bool CanLowerReturn(CallingConv::ID CallConv, MachineFunction &MF,
1299 const SmallVectorImpl<ISD::OutputArg> &Outs,
1300 LLVMContext &Context) const override;
1302 const MCPhysReg *getScratchRegisters(CallingConv::ID CC) const override;
1304 TargetLoweringBase::AtomicExpansionKind
1305 shouldExpandAtomicLoadInIR(LoadInst *SI) const override;
1306 bool shouldExpandAtomicStoreInIR(StoreInst *SI) const override;
1307 TargetLoweringBase::AtomicExpansionKind
1308 shouldExpandAtomicRMWInIR(AtomicRMWInst *AI) const override;
1311 lowerIdempotentRMWIntoFencedLoad(AtomicRMWInst *AI) const override;
1313 bool needsCmpXchgNb(Type *MemType) const;
1315 void SetupEntryBlockForSjLj(MachineInstr &MI, MachineBasicBlock *MBB,
1316 MachineBasicBlock *DispatchBB, int FI) const;
1318 // Utility function to emit the low-level va_arg code for X86-64.
1320 EmitVAARG64WithCustomInserter(MachineInstr &MI,
1321 MachineBasicBlock *MBB) const;
1323 /// Utility function to emit the xmm reg save portion of va_start.
1325 EmitVAStartSaveXMMRegsWithCustomInserter(MachineInstr &BInstr,
1326 MachineBasicBlock *BB) const;
1328 MachineBasicBlock *EmitLoweredCascadedSelect(MachineInstr &MI1,
1330 MachineBasicBlock *BB) const;
1332 MachineBasicBlock *EmitLoweredSelect(MachineInstr &I,
1333 MachineBasicBlock *BB) const;
1335 MachineBasicBlock *EmitLoweredAtomicFP(MachineInstr &I,
1336 MachineBasicBlock *BB) const;
1338 MachineBasicBlock *EmitLoweredCatchRet(MachineInstr &MI,
1339 MachineBasicBlock *BB) const;
1341 MachineBasicBlock *EmitLoweredCatchPad(MachineInstr &MI,
1342 MachineBasicBlock *BB) const;
1344 MachineBasicBlock *EmitLoweredSegAlloca(MachineInstr &MI,
1345 MachineBasicBlock *BB) const;
1347 MachineBasicBlock *EmitLoweredTLSAddr(MachineInstr &MI,
1348 MachineBasicBlock *BB) const;
1350 MachineBasicBlock *EmitLoweredTLSCall(MachineInstr &MI,
1351 MachineBasicBlock *BB) const;
1353 MachineBasicBlock *EmitLoweredRetpoline(MachineInstr &MI,
1354 MachineBasicBlock *BB) const;
1356 MachineBasicBlock *emitEHSjLjSetJmp(MachineInstr &MI,
1357 MachineBasicBlock *MBB) const;
1359 void emitSetJmpShadowStackFix(MachineInstr &MI,
1360 MachineBasicBlock *MBB) const;
1362 MachineBasicBlock *emitEHSjLjLongJmp(MachineInstr &MI,
1363 MachineBasicBlock *MBB) const;
1365 MachineBasicBlock *emitLongJmpShadowStackFix(MachineInstr &MI,
1366 MachineBasicBlock *MBB) const;
1368 MachineBasicBlock *emitFMA3Instr(MachineInstr &MI,
1369 MachineBasicBlock *MBB) const;
1371 MachineBasicBlock *EmitSjLjDispatchBlock(MachineInstr &MI,
1372 MachineBasicBlock *MBB) const;
1374 /// Emit nodes that will be selected as "cmp Op0,Op1", or something
1375 /// equivalent, for use with the given x86 condition code.
1376 SDValue EmitCmp(SDValue Op0, SDValue Op1, unsigned X86CC, const SDLoc &dl,
1377 SelectionDAG &DAG) const;
1379 /// Convert a comparison if required by the subtarget.
1380 SDValue ConvertCmpIfNecessary(SDValue Cmp, SelectionDAG &DAG) const;
1382 /// Emit flags for the given setcc condition and operands. Also returns the
1383 /// corresponding X86 condition code constant in X86CC.
1384 SDValue emitFlagsForSetcc(SDValue Op0, SDValue Op1,
1385 ISD::CondCode CC, const SDLoc &dl,
1387 SDValue &X86CC) const;
1389 /// Check if replacement of SQRT with RSQRT should be disabled.
1390 bool isFsqrtCheap(SDValue Operand, SelectionDAG &DAG) const override;
1392 /// Use rsqrt* to speed up sqrt calculations.
1393 SDValue getSqrtEstimate(SDValue Operand, SelectionDAG &DAG, int Enabled,
1394 int &RefinementSteps, bool &UseOneConstNR,
1395 bool Reciprocal) const override;
1397 /// Use rcp* to speed up fdiv calculations.
1398 SDValue getRecipEstimate(SDValue Operand, SelectionDAG &DAG, int Enabled,
1399 int &RefinementSteps) const override;
1401 /// Reassociate floating point divisions into multiply by reciprocal.
1402 unsigned combineRepeatedFPDivisors() const override;
1406 FastISel *createFastISel(FunctionLoweringInfo &funcInfo,
1407 const TargetLibraryInfo *libInfo);
1408 } // end namespace X86
1410 // Base class for all X86 non-masked store operations.
1411 class X86StoreSDNode : public MemSDNode {
1413 X86StoreSDNode(unsigned Opcode, unsigned Order, const DebugLoc &dl,
1414 SDVTList VTs, EVT MemVT,
1415 MachineMemOperand *MMO)
1416 :MemSDNode(Opcode, Order, dl, VTs, MemVT, MMO) {}
1417 const SDValue &getValue() const { return getOperand(1); }
1418 const SDValue &getBasePtr() const { return getOperand(2); }
1420 static bool classof(const SDNode *N) {
1421 return N->getOpcode() == X86ISD::VTRUNCSTORES ||
1422 N->getOpcode() == X86ISD::VTRUNCSTOREUS;
1426 // Base class for all X86 masked store operations.
1427 // The class has the same order of operands as MaskedStoreSDNode for
1429 class X86MaskedStoreSDNode : public MemSDNode {
1431 X86MaskedStoreSDNode(unsigned Opcode, unsigned Order,
1432 const DebugLoc &dl, SDVTList VTs, EVT MemVT,
1433 MachineMemOperand *MMO)
1434 : MemSDNode(Opcode, Order, dl, VTs, MemVT, MMO) {}
1436 const SDValue &getValue() const { return getOperand(1); }
1437 const SDValue &getBasePtr() const { return getOperand(2); }
1438 const SDValue &getMask() const { return getOperand(3); }
1440 static bool classof(const SDNode *N) {
1441 return N->getOpcode() == X86ISD::VMTRUNCSTORES ||
1442 N->getOpcode() == X86ISD::VMTRUNCSTOREUS;
1446 // X86 Truncating Store with Signed saturation.
1447 class TruncSStoreSDNode : public X86StoreSDNode {
1449 TruncSStoreSDNode(unsigned Order, const DebugLoc &dl,
1450 SDVTList VTs, EVT MemVT, MachineMemOperand *MMO)
1451 : X86StoreSDNode(X86ISD::VTRUNCSTORES, Order, dl, VTs, MemVT, MMO) {}
1453 static bool classof(const SDNode *N) {
1454 return N->getOpcode() == X86ISD::VTRUNCSTORES;
1458 // X86 Truncating Store with Unsigned saturation.
1459 class TruncUSStoreSDNode : public X86StoreSDNode {
1461 TruncUSStoreSDNode(unsigned Order, const DebugLoc &dl,
1462 SDVTList VTs, EVT MemVT, MachineMemOperand *MMO)
1463 : X86StoreSDNode(X86ISD::VTRUNCSTOREUS, Order, dl, VTs, MemVT, MMO) {}
1465 static bool classof(const SDNode *N) {
1466 return N->getOpcode() == X86ISD::VTRUNCSTOREUS;
1470 // X86 Truncating Masked Store with Signed saturation.
1471 class MaskedTruncSStoreSDNode : public X86MaskedStoreSDNode {
1473 MaskedTruncSStoreSDNode(unsigned Order,
1474 const DebugLoc &dl, SDVTList VTs, EVT MemVT,
1475 MachineMemOperand *MMO)
1476 : X86MaskedStoreSDNode(X86ISD::VMTRUNCSTORES, Order, dl, VTs, MemVT, MMO) {}
1478 static bool classof(const SDNode *N) {
1479 return N->getOpcode() == X86ISD::VMTRUNCSTORES;
1483 // X86 Truncating Masked Store with Unsigned saturation.
1484 class MaskedTruncUSStoreSDNode : public X86MaskedStoreSDNode {
1486 MaskedTruncUSStoreSDNode(unsigned Order,
1487 const DebugLoc &dl, SDVTList VTs, EVT MemVT,
1488 MachineMemOperand *MMO)
1489 : X86MaskedStoreSDNode(X86ISD::VMTRUNCSTOREUS, Order, dl, VTs, MemVT, MMO) {}
1491 static bool classof(const SDNode *N) {
1492 return N->getOpcode() == X86ISD::VMTRUNCSTOREUS;
1496 // X86 specific Gather/Scatter nodes.
1497 // The class has the same order of operands as MaskedGatherScatterSDNode for
1499 class X86MaskedGatherScatterSDNode : public MemSDNode {
1501 X86MaskedGatherScatterSDNode(unsigned Opc, unsigned Order,
1502 const DebugLoc &dl, SDVTList VTs, EVT MemVT,
1503 MachineMemOperand *MMO)
1504 : MemSDNode(Opc, Order, dl, VTs, MemVT, MMO) {}
1506 const SDValue &getBasePtr() const { return getOperand(3); }
1507 const SDValue &getIndex() const { return getOperand(4); }
1508 const SDValue &getMask() const { return getOperand(2); }
1509 const SDValue &getScale() const { return getOperand(5); }
1511 static bool classof(const SDNode *N) {
1512 return N->getOpcode() == X86ISD::MGATHER ||
1513 N->getOpcode() == X86ISD::MSCATTER;
1517 class X86MaskedGatherSDNode : public X86MaskedGatherScatterSDNode {
1519 X86MaskedGatherSDNode(unsigned Order, const DebugLoc &dl, SDVTList VTs,
1520 EVT MemVT, MachineMemOperand *MMO)
1521 : X86MaskedGatherScatterSDNode(X86ISD::MGATHER, Order, dl, VTs, MemVT,
1524 const SDValue &getPassThru() const { return getOperand(1); }
1526 static bool classof(const SDNode *N) {
1527 return N->getOpcode() == X86ISD::MGATHER;
1531 class X86MaskedScatterSDNode : public X86MaskedGatherScatterSDNode {
1533 X86MaskedScatterSDNode(unsigned Order, const DebugLoc &dl, SDVTList VTs,
1534 EVT MemVT, MachineMemOperand *MMO)
1535 : X86MaskedGatherScatterSDNode(X86ISD::MSCATTER, Order, dl, VTs, MemVT,
1538 const SDValue &getValue() const { return getOperand(1); }
1540 static bool classof(const SDNode *N) {
1541 return N->getOpcode() == X86ISD::MSCATTER;
1545 /// Generate unpacklo/unpackhi shuffle mask.
1546 template <typename T = int>
1547 void createUnpackShuffleMask(MVT VT, SmallVectorImpl<T> &Mask, bool Lo,
1549 assert(Mask.empty() && "Expected an empty shuffle mask vector");
1550 int NumElts = VT.getVectorNumElements();
1551 int NumEltsInLane = 128 / VT.getScalarSizeInBits();
1552 for (int i = 0; i < NumElts; ++i) {
1553 unsigned LaneStart = (i / NumEltsInLane) * NumEltsInLane;
1554 int Pos = (i % NumEltsInLane) / 2 + LaneStart;
1555 Pos += (Unary ? 0 : NumElts * (i % 2));
1556 Pos += (Lo ? 0 : NumEltsInLane / 2);
1557 Mask.push_back(Pos);
1561 /// Helper function to scale a shuffle or target shuffle mask, replacing each
1562 /// mask index with the scaled sequential indices for an equivalent narrowed
1563 /// mask. This is the reverse process to canWidenShuffleElements, but can
1565 template <typename T>
1566 void scaleShuffleMask(int Scale, ArrayRef<T> Mask,
1567 SmallVectorImpl<T> &ScaledMask) {
1568 assert(0 < Scale && "Unexpected scaling factor");
1569 int NumElts = Mask.size();
1570 ScaledMask.assign(static_cast<size_t>(NumElts * Scale), -1);
1572 for (int i = 0; i != NumElts; ++i) {
1575 // Repeat sentinel values in every mask element.
1577 for (int s = 0; s != Scale; ++s)
1578 ScaledMask[(Scale * i) + s] = M;
1582 // Scale mask element and increment across each mask element.
1583 for (int s = 0; s != Scale; ++s)
1584 ScaledMask[(Scale * i) + s] = (Scale * M) + s;
1587 } // end namespace llvm
1589 #endif // LLVM_LIB_TARGET_X86_X86ISELLOWERING_H