1 //===-- X86ISelLowering.h - X86 DAG Lowering Interface ----------*- C++ -*-===//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
9 // This file defines the interfaces that X86 uses to lower LLVM code into a
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_LIB_TARGET_X86_X86ISELLOWERING_H
15 #define LLVM_LIB_TARGET_X86_X86ISELLOWERING_H
17 #include "llvm/CodeGen/CallingConvLower.h"
18 #include "llvm/CodeGen/SelectionDAG.h"
19 #include "llvm/CodeGen/TargetLowering.h"
20 #include "llvm/Target/TargetOptions.h"
24 class X86TargetMachine;
27 // X86 Specific DAG Nodes
28 enum NodeType : unsigned {
29 // Start the numbering where the builtin ops leave off.
30 FIRST_NUMBER = ISD::BUILTIN_OP_END,
37 /// Double shift instructions. These correspond to
38 /// X86::SHLDxx and X86::SHRDxx instructions.
42 /// Bitwise logical AND of floating point values. This corresponds
43 /// to X86::ANDPS or X86::ANDPD.
46 /// Bitwise logical OR of floating point values. This corresponds
47 /// to X86::ORPS or X86::ORPD.
50 /// Bitwise logical XOR of floating point values. This corresponds
51 /// to X86::XORPS or X86::XORPD.
54 /// Bitwise logical ANDNOT of floating point values. This
55 /// corresponds to X86::ANDNPS or X86::ANDNPD.
58 /// These operations represent an abstract X86 call
59 /// instruction, which includes a bunch of information. In particular the
60 /// operands of these node are:
62 /// #0 - The incoming token chain
64 /// #2 - The number of arg bytes the caller pushes on the stack.
65 /// #3 - The number of arg bytes the callee pops off the stack.
66 /// #4 - The value to pass in AL/AX/EAX (optional)
67 /// #5 - The value to pass in DL/DX/EDX (optional)
69 /// The result values of these nodes are:
71 /// #0 - The outgoing token chain
72 /// #1 - The first register result value (optional)
73 /// #2 - The second register result value (optional)
77 /// Same as call except it adds the NoTrack prefix.
80 /// X86 compare and logical compare instructions.
83 /// X86 bit-test instructions.
86 /// X86 SetCC. Operand 0 is condition code, and operand 1 is the EFLAGS
87 /// operand, usually 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.
95 SETCC_CARRY, // R = carry_bit ? ~0 : 0
97 /// X86 FP SETCC, implemented with CMP{cc}SS/CMP{cc}SD.
98 /// Operands are two FP values to compare; result is a mask of
99 /// 0s or 1s. Generally DTRT for C/C++ with NaNs.
102 /// X86 FP SETCC, similar to above, but with output as an i1 mask and
103 /// and a version with SAE.
104 FSETCCM, FSETCCM_SAE,
106 /// X86 conditional moves. Operand 0 and operand 1 are the two values
107 /// to select from. Operand 2 is the condition code, and operand 3 is the
108 /// flag operand produced by a CMP or TEST instruction.
111 /// X86 conditional branches. Operand 0 is the chain operand, operand 1
112 /// is the block to branch if condition is true, operand 2 is the
113 /// condition code, and operand 3 is the flag operand produced by a CMP
114 /// or TEST instruction.
117 /// BRIND node with NoTrack prefix. Operand 0 is the chain operand and
118 /// operand 1 is the target address.
121 /// Return with a flag operand. Operand 0 is the chain operand, operand
122 /// 1 is the number of bytes of stack to pop.
125 /// Return from interrupt. Operand 0 is the number of bytes to pop.
128 /// Repeat fill, corresponds to X86::REP_STOSx.
131 /// Repeat move, corresponds to X86::REP_MOVSx.
134 /// On Darwin, this node represents the result of the popl
135 /// at function entry, used for PIC code.
138 /// A wrapper node for TargetConstantPool, TargetJumpTable,
139 /// TargetExternalSymbol, TargetGlobalAddress, TargetGlobalTLSAddress,
140 /// MCSymbol and TargetBlockAddress.
143 /// Special wrapper used under X86-64 PIC mode for RIP
144 /// relative displacements.
147 /// Copies a 64-bit value from the low word of an XMM vector
148 /// to an MMX vector.
151 /// Copies a 32-bit value from the low word of a MMX
155 /// Copies a GPR into the low 32-bit word of a MMX vector
156 /// and zero out the high word.
159 /// Extract an 8-bit value from a vector and zero extend it to
160 /// i32, corresponds to X86::PEXTRB.
163 /// Extract a 16-bit value from a vector and zero extend it to
164 /// i32, corresponds to X86::PEXTRW.
167 /// Insert any element of a 4 x float vector into any element
168 /// of a destination 4 x floatvector.
171 /// Insert the lower 8-bits of a 32-bit value to a vector,
172 /// corresponds to X86::PINSRB.
175 /// Insert the lower 16-bits of a 32-bit value to a vector,
176 /// corresponds to X86::PINSRW.
179 /// Shuffle 16 8-bit values within a vector.
182 /// Compute Sum of Absolute Differences.
184 /// Compute Double Block Packed Sum-Absolute-Differences
187 /// Bitwise Logical AND NOT of Packed FP values.
190 /// Blend where the selector is an immediate.
193 /// Dynamic (non-constant condition) vector blend where only the sign bits
194 /// of the condition elements are used. This is used to enforce that the
195 /// condition mask is not valid for generic VSELECT optimizations. This
196 /// is also used to implement the intrinsics.
197 /// Operands are in VSELECT order: MASK, TRUE, FALSE
200 /// Combined add and sub on an FP vector.
203 // FP vector ops with rounding mode.
204 FADD_RND, FADDS, FADDS_RND,
205 FSUB_RND, FSUBS, FSUBS_RND,
206 FMUL_RND, FMULS, FMULS_RND,
207 FDIV_RND, FDIVS, FDIVS_RND,
210 FSQRT_RND, FSQRTS, FSQRTS_RND,
212 // FP vector get exponent.
213 FGETEXP, FGETEXP_SAE, FGETEXPS, FGETEXPS_SAE,
214 // Extract Normalized Mantissas.
215 VGETMANT, VGETMANT_SAE, VGETMANTS, VGETMANTS_SAE,
218 SCALEFS, SCALEFS_RND,
220 // Unsigned Integer average.
223 /// Integer horizontal add/sub.
227 /// Floating point horizontal add/sub.
231 // Detect Conflicts Within a Vector
234 /// Floating point max and min.
237 /// Commutative FMIN and FMAX.
240 /// Scalar intrinsic floating point max and min.
243 /// Floating point reciprocal-sqrt and reciprocal approximation.
244 /// Note that these typically require refinement
245 /// in order to obtain suitable precision.
248 // AVX-512 reciprocal approximations with a little more precision.
249 RSQRT14, RSQRT14S, RCP14, RCP14S,
251 // Thread Local Storage.
254 // Thread Local Storage. A call to get the start address
255 // of the TLS block for the current module.
258 // Thread Local Storage. When calling to an OS provided
259 // thunk at the address from an earlier relocation.
262 // Exception Handling helpers.
265 // SjLj exception handling setjmp.
268 // SjLj exception handling longjmp.
271 // SjLj exception handling dispatch.
272 EH_SJLJ_SETUP_DISPATCH,
274 /// Tail call return. See X86TargetLowering::LowerCall for
275 /// the list of operands.
278 // Vector move to low scalar and zero higher vector elements.
281 // Vector integer truncate.
283 // Vector integer truncate with unsigned/signed saturation.
286 // Masked version of the above. Used when less than a 128-bit result is
287 // produced since the mask only applies to the lower elements and can't
288 // be represented by a select.
289 // SRC, PASSTHRU, MASK
290 VMTRUNC, VMTRUNCUS, VMTRUNCS,
293 VFPEXT, VFPEXT_SAE, VFPEXTS, VFPEXTS_SAE,
296 VFPROUND, VFPROUND_RND, VFPROUNDS, VFPROUNDS_RND,
298 // Masked version of above. Used for v2f64->v4f32.
299 // SRC, PASSTHRU, MASK
302 // 128-bit vector logical left / right shift
305 // Vector shift elements
308 // Vector variable shift
311 // Vector shift elements by immediate
314 // Shifts of mask registers.
317 // Bit rotate by immediate
320 // Vector packed double/float comparison.
323 // Vector integer comparisons.
326 // v8i16 Horizontal minimum and position.
331 /// Vector comparison generating mask bits for fp and
332 /// integer signed and unsigned data types.
334 // Vector comparison with SAE for FP values
337 // Arithmetic operations with FLAGS results.
338 ADD, SUB, ADC, SBB, SMUL, UMUL,
341 // Bit field extract.
344 // Zero High Bits Starting with Specified Bit Position.
347 // X86-specific multiply by immediate.
350 // Vector sign bit extraction.
353 // Vector bitwise comparisons.
356 // Vector packed fp sign bitwise comparisons.
359 // OR/AND test for masks.
366 // Several flavors of instructions with vector shuffle behaviors.
367 // Saturated signed/unnsigned packing.
370 // Intra-lane alignr.
372 // AVX512 inter-lane alignr.
378 // VBMI2 Concat & Shift.
383 //Shuffle Packed Values at 128-bit granularity.
399 // Variable Permute (VPERM).
400 // Res = VPERMV MaskV, V0
403 // 3-op Variable Permute (VPERMT2).
404 // Res = VPERMV3 V0, MaskV, V1
407 // Bitwise ternary logic.
409 // Fix Up Special Packed Float32/64 values.
410 VFIXUPIMM, VFIXUPIMM_SAE,
411 VFIXUPIMMS, VFIXUPIMMS_SAE,
412 // Range Restriction Calculation For Packed Pairs of Float32/64 values.
413 VRANGE, VRANGE_SAE, VRANGES, VRANGES_SAE,
414 // Reduce - Perform Reduction Transformation on scalar\packed FP.
415 VREDUCE, VREDUCE_SAE, VREDUCES, VREDUCES_SAE,
416 // RndScale - Round FP Values To Include A Given Number Of Fraction Bits.
417 // Also used by the legacy (V)ROUND intrinsics where we mask out the
418 // scaling part of the immediate.
419 VRNDSCALE, VRNDSCALE_SAE, VRNDSCALES, VRNDSCALES_SAE,
420 // Tests Types Of a FP Values for packed types.
422 // Tests Types Of a FP Values for scalar types.
425 // Broadcast (splat) scalar or element 0 of a vector. If the operand is
426 // a vector, this node may change the vector length as part of the splat.
428 // Broadcast mask to vector.
430 // Broadcast subvector to vector.
433 /// SSE4A Extraction and Insertion.
436 // XOP arithmetic/logical shifts.
438 // XOP signed/unsigned integer comparisons.
440 // XOP packed permute bytes.
442 // XOP two source permutation.
445 // Vector multiply packed unsigned doubleword integers.
447 // Vector multiply packed signed doubleword integers.
449 // Vector Multiply Packed UnsignedIntegers with Round and Scale.
452 // Multiply and Add Packed Integers.
453 VPMADDUBSW, VPMADDWD,
455 // AVX512IFMA multiply and add.
456 // NOTE: These are different than the instruction and perform
458 VPMADD52L, VPMADD52H,
467 // We use the target independent ISD::FMA for the non-inverted case.
474 // FMA with rounding mode.
482 // Compress and expand.
489 // Convert Unsigned/Integer to Floating-Point Value with rounding mode.
490 SINT_TO_FP_RND, UINT_TO_FP_RND,
491 SCALAR_SINT_TO_FP, SCALAR_UINT_TO_FP,
492 SCALAR_SINT_TO_FP_RND, SCALAR_UINT_TO_FP_RND,
494 // Vector float/double to signed/unsigned integer.
495 CVTP2SI, CVTP2UI, CVTP2SI_RND, CVTP2UI_RND,
496 // Scalar float/double to signed/unsigned integer.
497 CVTS2SI, CVTS2UI, CVTS2SI_RND, CVTS2UI_RND,
499 // Vector float/double to signed/unsigned integer with truncation.
500 CVTTP2SI, CVTTP2UI, CVTTP2SI_SAE, CVTTP2UI_SAE,
501 // Scalar float/double to signed/unsigned integer with truncation.
502 CVTTS2SI, CVTTS2UI, CVTTS2SI_SAE, CVTTS2UI_SAE,
504 // Vector signed/unsigned integer to float/double.
507 // Masked versions of above. Used for v2f64->v4f32.
508 // SRC, PASSTHRU, MASK
509 MCVTP2SI, MCVTP2UI, MCVTTP2SI, MCVTTP2UI,
512 // Vector float to bfloat16.
513 // Convert TWO packed single data to one packed BF16 data
515 // Convert packed single data to packed BF16 data
517 // Masked version of above.
518 // SRC, PASSTHRU, MASK
521 // Dot product of BF16 pairs to accumulated into
522 // packed single precision.
525 // Save xmm argument registers to the stack, according to %al. An operator
526 // is needed so that this can be expanded with control flow.
527 VASTART_SAVE_XMM_REGS,
529 // Windows's _chkstk call to do stack probing.
532 // For allocating variable amounts of stack space when using
533 // segmented stacks. Check if the current stacklet has enough space, and
534 // falls back to heap allocation if not.
541 // Store FP status word into i16 register.
544 // Store contents of %ah into %eflags.
547 // Get a random integer and indicate whether it is valid in CF.
550 // Get a NIST SP800-90B & C compliant random integer and
551 // indicate whether it is valid in CF.
555 // RDPKRU - Operand 0 is chain. Operand 1 is value for ECX.
556 // WRPKRU - Operand 0 is chain. Operand 1 is value for EDX. Operand 2 is
560 // SSE42 string comparisons.
561 // These nodes produce 3 results, index, mask, and flags. X86ISelDAGToDAG
562 // will emit one or two instructions based on which results are used. If
563 // flags and index/mask this allows us to use a single instruction since
564 // we won't have to pick and opcode for flags. Instead we can rely on the
565 // DAG to CSE everything and decide at isel.
569 // Test if in transactional execution.
573 RSQRT28, RSQRT28_SAE, RSQRT28S, RSQRT28S_SAE,
574 RCP28, RCP28_SAE, RCP28S, RCP28S_SAE, EXP2, EXP2_SAE,
576 // Conversions between float and half-float.
577 CVTPS2PH, CVTPH2PS, CVTPH2PS_SAE,
579 // Masked version of above.
580 // SRC, RND, PASSTHRU, MASK
583 // Galois Field Arithmetic Instructions
584 GF2P8AFFINEINVQB, GF2P8AFFINEQB, GF2P8MULB,
586 // LWP insert record.
592 // Enqueue Stores Instructions
595 // For avx512-vp2intersect
599 LCMPXCHG_DAG = ISD::FIRST_TARGET_MEMORY_OPCODE,
602 LCMPXCHG8_SAVE_EBX_DAG,
603 LCMPXCHG16_SAVE_RBX_DAG,
605 /// LOCK-prefixed arithmetic read-modify-write instructions.
606 /// EFLAGS, OUTCHAIN = LADD(INCHAIN, PTR, RHS)
607 LADD, LSUB, LOR, LXOR, LAND,
609 // Load, scalar_to_vector, and zero extend.
612 // extract_vector_elt, store.
615 // Store FP control world into i16 memory.
618 /// This instruction implements FP_TO_SINT with the
619 /// integer destination in memory and a FP reg source. This corresponds
620 /// to the X86::FIST*m instructions and the rounding mode change stuff. It
621 /// has two inputs (token chain and address) and two outputs (int value
622 /// and token chain). Memory VT specifies the type to store to.
625 /// This instruction implements SINT_TO_FP with the
626 /// integer source in memory and FP reg result. This corresponds to the
627 /// X86::FILD*m instructions. It has two inputs (token chain and address)
628 /// and two outputs (FP value and token chain). FILD_FLAG also produces a
629 /// flag). The integer source type is specified by the memory VT.
633 /// This instruction implements a fp->int store from FP stack
634 /// slots. This corresponds to the fist instruction. It takes a
635 /// chain operand, value to store, address, and glue. The memory VT
636 /// specifies the type to store as.
639 /// This instruction implements an extending load to FP stack slots.
640 /// This corresponds to the X86::FLD32m / X86::FLD64m. It takes a chain
641 /// operand, and ptr to load from. The memory VT specifies the type to
645 /// This instruction implements a truncating store from FP stack
646 /// slots. This corresponds to the X86::FST32m / X86::FST64m. It takes a
647 /// chain operand, value to store, address, and glue. The memory VT
648 /// specifies the type to store as.
651 /// This instruction grabs the address of the next argument
652 /// from a va_list. (reads and modifies the va_list in memory)
655 // Vector truncating store with unsigned/signed saturation
656 VTRUNCSTOREUS, VTRUNCSTORES,
657 // Vector truncating masked store with unsigned/signed saturation
658 VMTRUNCSTOREUS, VMTRUNCSTORES,
660 // X86 specific gather and scatter
663 // WARNING: Do not add anything in the end unless you want the node to
664 // have memop! In fact, starting from FIRST_TARGET_MEMORY_OPCODE all
665 // opcodes will be thought as target memory ops!
667 } // end namespace X86ISD
669 /// Define some predicates that are used for node matching.
671 /// Returns true if Elt is a constant zero or floating point constant +0.0.
672 bool isZeroNode(SDValue Elt);
674 /// Returns true of the given offset can be
675 /// fit into displacement field of the instruction.
676 bool isOffsetSuitableForCodeModel(int64_t Offset, CodeModel::Model M,
677 bool hasSymbolicDisplacement = true);
679 /// Determines whether the callee is required to pop its
680 /// own arguments. Callee pop is necessary to support tail calls.
681 bool isCalleePop(CallingConv::ID CallingConv,
682 bool is64Bit, bool IsVarArg, bool GuaranteeTCO);
684 } // end namespace X86
686 //===--------------------------------------------------------------------===//
687 // X86 Implementation of the TargetLowering interface
688 class X86TargetLowering final : public TargetLowering {
690 explicit X86TargetLowering(const X86TargetMachine &TM,
691 const X86Subtarget &STI);
693 unsigned getJumpTableEncoding() const override;
694 bool useSoftFloat() const override;
696 void markLibCallAttributes(MachineFunction *MF, unsigned CC,
697 ArgListTy &Args) const override;
699 MVT getScalarShiftAmountTy(const DataLayout &, EVT VT) const override {
704 LowerCustomJumpTableEntry(const MachineJumpTableInfo *MJTI,
705 const MachineBasicBlock *MBB, unsigned uid,
706 MCContext &Ctx) const override;
708 /// Returns relocation base for the given PIC jumptable.
709 SDValue getPICJumpTableRelocBase(SDValue Table,
710 SelectionDAG &DAG) const override;
712 getPICJumpTableRelocBaseExpr(const MachineFunction *MF,
713 unsigned JTI, MCContext &Ctx) const override;
715 /// Return the desired alignment for ByVal aggregate
716 /// function arguments in the caller parameter area. For X86, aggregates
717 /// that contains are placed at 16-byte boundaries while the rest are at
718 /// 4-byte boundaries.
719 unsigned getByValTypeAlignment(Type *Ty,
720 const DataLayout &DL) const override;
722 /// Returns the target specific optimal type for load
723 /// and store operations as a result of memset, memcpy, and memmove
724 /// lowering. If DstAlign is zero that means it's safe to destination
725 /// alignment can satisfy any constraint. Similarly if SrcAlign is zero it
726 /// means there isn't a need to check it against alignment requirement,
727 /// probably because the source does not need to be loaded. If 'IsMemset' is
728 /// true, that means it's expanding a memset. If 'ZeroMemset' is true, that
729 /// means it's a memset of zero. 'MemcpyStrSrc' indicates whether the memcpy
730 /// source is constant so it does not need to be loaded.
731 /// It returns EVT::Other if the type should be determined using generic
732 /// target-independent logic.
733 EVT getOptimalMemOpType(uint64_t Size, unsigned DstAlign, unsigned SrcAlign,
734 bool IsMemset, bool ZeroMemset, bool MemcpyStrSrc,
735 const AttributeList &FuncAttributes) const override;
737 /// Returns true if it's safe to use load / store of the
738 /// specified type to expand memcpy / memset inline. This is mostly true
739 /// for all types except for some special cases. For example, on X86
740 /// targets without SSE2 f64 load / store are done with fldl / fstpl which
741 /// also does type conversion. Note the specified type doesn't have to be
742 /// legal as the hook is used before type legalization.
743 bool isSafeMemOpType(MVT VT) const override;
745 /// Returns true if the target allows unaligned memory accesses of the
746 /// specified type. Returns whether it is "fast" in the last argument.
747 bool allowsMisalignedMemoryAccesses(EVT VT, unsigned AS, unsigned Align,
748 MachineMemOperand::Flags Flags,
749 bool *Fast) const override;
751 /// Provide custom lowering hooks for some operations.
753 SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const override;
755 /// Places new result values for the node in Results (their number
756 /// and types must exactly match those of the original return values of
757 /// the node), or leaves Results empty, which indicates that the node is not
758 /// to be custom lowered after all.
759 void LowerOperationWrapper(SDNode *N,
760 SmallVectorImpl<SDValue> &Results,
761 SelectionDAG &DAG) const override;
763 /// Replace the results of node with an illegal result
764 /// type with new values built out of custom code.
766 void ReplaceNodeResults(SDNode *N, SmallVectorImpl<SDValue>&Results,
767 SelectionDAG &DAG) const override;
769 SDValue PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const override;
771 // Return true if it is profitable to combine a BUILD_VECTOR with a
772 // stride-pattern to a shuffle and a truncate.
773 // Example of such a combine:
774 // v4i32 build_vector((extract_elt V, 1),
775 // (extract_elt V, 3),
776 // (extract_elt V, 5),
777 // (extract_elt V, 7))
779 // v4i32 truncate (bitcast (shuffle<1,u,3,u,4,u,5,u,6,u,7,u> V, u) to
781 bool isDesirableToCombineBuildVectorToShuffleTruncate(
782 ArrayRef<int> ShuffleMask, EVT SrcVT, EVT TruncVT) const override;
784 /// Return true if the target has native support for
785 /// the specified value type and it is 'desirable' to use the type for the
786 /// given node type. e.g. On x86 i16 is legal, but undesirable since i16
787 /// instruction encodings are longer and some i16 instructions are slow.
788 bool isTypeDesirableForOp(unsigned Opc, EVT VT) const override;
790 /// Return true if the target has native support for the
791 /// specified value type and it is 'desirable' to use the type. e.g. On x86
792 /// i16 is legal, but undesirable since i16 instruction encodings are longer
793 /// and some i16 instructions are slow.
794 bool IsDesirableToPromoteOp(SDValue Op, EVT &PVT) const override;
797 EmitInstrWithCustomInserter(MachineInstr &MI,
798 MachineBasicBlock *MBB) const override;
800 /// This method returns the name of a target specific DAG node.
801 const char *getTargetNodeName(unsigned Opcode) const override;
803 /// Do not merge vector stores after legalization because that may conflict
804 /// with x86-specific store splitting optimizations.
805 bool mergeStoresAfterLegalization(EVT MemVT) const override {
806 return !MemVT.isVector();
809 bool canMergeStoresTo(unsigned AddressSpace, EVT MemVT,
810 const SelectionDAG &DAG) const override;
812 bool isCheapToSpeculateCttz() const override;
814 bool isCheapToSpeculateCtlz() const override;
816 bool isCtlzFast() const override;
818 bool hasBitPreservingFPLogic(EVT VT) const override {
819 return VT == MVT::f32 || VT == MVT::f64 || VT.isVector();
822 bool isMultiStoresCheaperThanBitsMerge(EVT LTy, EVT HTy) const override {
823 // If the pair to store is a mixture of float and int values, we will
824 // save two bitwise instructions and one float-to-int instruction and
825 // increase one store instruction. There is potentially a more
826 // significant benefit because it avoids the float->int domain switch
827 // for input value. So It is more likely a win.
828 if ((LTy.isFloatingPoint() && HTy.isInteger()) ||
829 (LTy.isInteger() && HTy.isFloatingPoint()))
831 // If the pair only contains int values, we will save two bitwise
832 // instructions and increase one store instruction (costing one more
833 // store buffer). Since the benefit is more blurred so we leave
834 // such pair out until we get testcase to prove it is a win.
838 bool isMaskAndCmp0FoldingBeneficial(const Instruction &AndI) const override;
840 bool hasAndNotCompare(SDValue Y) const override;
842 bool hasAndNot(SDValue Y) const override;
844 bool shouldFoldConstantShiftPairToMask(const SDNode *N,
845 CombineLevel Level) const override;
847 bool shouldFoldMaskToVariableShiftPair(SDValue Y) const override;
850 shouldTransformSignedTruncationCheck(EVT XVT,
851 unsigned KeptBits) const override {
852 // For vectors, we don't have a preference..
856 auto VTIsOk = [](EVT VT) -> bool {
857 return VT == MVT::i8 || VT == MVT::i16 || VT == MVT::i32 ||
861 // We are ok with KeptBitsVT being byte/word/dword, what MOVS supports.
862 // XVT will be larger than KeptBitsVT.
863 MVT KeptBitsVT = MVT::getIntegerVT(KeptBits);
864 return VTIsOk(XVT) && VTIsOk(KeptBitsVT);
867 bool shouldExpandShift(SelectionDAG &DAG, SDNode *N) const override;
869 bool shouldSplatInsEltVarIndex(EVT VT) const override;
871 bool convertSetCCLogicToBitwiseLogic(EVT VT) const override {
872 return VT.isScalarInteger();
875 /// Vector-sized comparisons are fast using PCMPEQ + PMOVMSK or PTEST.
876 MVT hasFastEqualityCompare(unsigned NumBits) const override;
878 /// Return the value type to use for ISD::SETCC.
879 EVT getSetCCResultType(const DataLayout &DL, LLVMContext &Context,
880 EVT VT) const override;
882 bool targetShrinkDemandedConstant(SDValue Op, const APInt &Demanded,
883 TargetLoweringOpt &TLO) const override;
885 /// Determine which of the bits specified in Mask are known to be either
886 /// zero or one and return them in the KnownZero/KnownOne bitsets.
887 void computeKnownBitsForTargetNode(const SDValue Op,
889 const APInt &DemandedElts,
890 const SelectionDAG &DAG,
891 unsigned Depth = 0) const override;
893 /// Determine the number of bits in the operation that are sign bits.
894 unsigned ComputeNumSignBitsForTargetNode(SDValue Op,
895 const APInt &DemandedElts,
896 const SelectionDAG &DAG,
897 unsigned Depth) const override;
899 bool SimplifyDemandedVectorEltsForTargetNode(SDValue Op,
900 const APInt &DemandedElts,
903 TargetLoweringOpt &TLO,
904 unsigned Depth) const override;
906 bool SimplifyDemandedBitsForTargetNode(SDValue Op,
907 const APInt &DemandedBits,
908 const APInt &DemandedElts,
910 TargetLoweringOpt &TLO,
911 unsigned Depth) const override;
913 const Constant *getTargetConstantFromLoad(LoadSDNode *LD) const override;
915 SDValue unwrapAddress(SDValue N) const override;
917 SDValue getReturnAddressFrameIndex(SelectionDAG &DAG) const;
919 bool ExpandInlineAsm(CallInst *CI) const override;
921 ConstraintType getConstraintType(StringRef Constraint) const override;
923 /// Examine constraint string and operand type and determine a weight value.
924 /// The operand object must already have been set up with the operand type.
926 getSingleConstraintMatchWeight(AsmOperandInfo &info,
927 const char *constraint) const override;
929 const char *LowerXConstraint(EVT ConstraintVT) const override;
931 /// Lower the specified operand into the Ops vector. If it is invalid, don't
932 /// add anything to Ops. If hasMemory is true it means one of the asm
933 /// constraint of the inline asm instruction being processed is 'm'.
934 void LowerAsmOperandForConstraint(SDValue Op,
935 std::string &Constraint,
936 std::vector<SDValue> &Ops,
937 SelectionDAG &DAG) const override;
940 getInlineAsmMemConstraint(StringRef ConstraintCode) const override {
941 if (ConstraintCode == "i")
942 return InlineAsm::Constraint_i;
943 else if (ConstraintCode == "o")
944 return InlineAsm::Constraint_o;
945 else if (ConstraintCode == "v")
946 return InlineAsm::Constraint_v;
947 else if (ConstraintCode == "X")
948 return InlineAsm::Constraint_X;
949 return TargetLowering::getInlineAsmMemConstraint(ConstraintCode);
952 /// Handle Lowering flag assembly outputs.
953 SDValue LowerAsmOutputForConstraint(SDValue &Chain, SDValue &Flag, SDLoc DL,
954 const AsmOperandInfo &Constraint,
955 SelectionDAG &DAG) const override;
957 /// Given a physical register constraint
958 /// (e.g. {edx}), return the register number and the register class for the
959 /// register. This should only be used for C_Register constraints. On
960 /// error, this returns a register number of 0.
961 std::pair<unsigned, const TargetRegisterClass *>
962 getRegForInlineAsmConstraint(const TargetRegisterInfo *TRI,
963 StringRef Constraint, MVT VT) const override;
965 /// Return true if the addressing mode represented
966 /// by AM is legal for this target, for a load/store of the specified type.
967 bool isLegalAddressingMode(const DataLayout &DL, const AddrMode &AM,
968 Type *Ty, unsigned AS,
969 Instruction *I = nullptr) const override;
971 /// Return true if the specified immediate is legal
972 /// icmp immediate, that is the target has icmp instructions which can
973 /// compare a register against the immediate without having to materialize
974 /// the immediate into a register.
975 bool isLegalICmpImmediate(int64_t Imm) const override;
977 /// Return true if the specified immediate is legal
978 /// add immediate, that is the target has add instructions which can
979 /// add a register and the immediate without having to materialize
980 /// the immediate into a register.
981 bool isLegalAddImmediate(int64_t Imm) const override;
983 bool isLegalStoreImmediate(int64_t Imm) const override;
985 /// Return the cost of the scaling factor used in the addressing
986 /// mode represented by AM for this target, for a load/store
987 /// of the specified type.
988 /// If the AM is supported, the return value must be >= 0.
989 /// If the AM is not supported, it returns a negative value.
990 int getScalingFactorCost(const DataLayout &DL, const AddrMode &AM, Type *Ty,
991 unsigned AS) const override;
993 bool isVectorShiftByScalarCheap(Type *Ty) const override;
995 /// Add x86-specific opcodes to the default list.
996 bool isBinOp(unsigned Opcode) const override;
998 /// Returns true if the opcode is a commutative binary operation.
999 bool isCommutativeBinOp(unsigned Opcode) const override;
1001 /// Return true if it's free to truncate a value of
1002 /// type Ty1 to type Ty2. e.g. On x86 it's free to truncate a i32 value in
1003 /// register EAX to i16 by referencing its sub-register AX.
1004 bool isTruncateFree(Type *Ty1, Type *Ty2) const override;
1005 bool isTruncateFree(EVT VT1, EVT VT2) const override;
1007 bool allowTruncateForTailCall(Type *Ty1, Type *Ty2) const override;
1009 /// Return true if any actual instruction that defines a
1010 /// value of type Ty1 implicit zero-extends the value to Ty2 in the result
1011 /// register. This does not necessarily include registers defined in
1012 /// unknown ways, such as incoming arguments, or copies from unknown
1013 /// virtual registers. Also, if isTruncateFree(Ty2, Ty1) is true, this
1014 /// does not necessarily apply to truncate instructions. e.g. on x86-64,
1015 /// all instructions that define 32-bit values implicit zero-extend the
1016 /// result out to 64 bits.
1017 bool isZExtFree(Type *Ty1, Type *Ty2) const override;
1018 bool isZExtFree(EVT VT1, EVT VT2) const override;
1019 bool isZExtFree(SDValue Val, EVT VT2) const override;
1021 /// Return true if folding a vector load into ExtVal (a sign, zero, or any
1022 /// extend node) is profitable.
1023 bool isVectorLoadExtDesirable(SDValue) const override;
1025 /// Return true if an FMA operation is faster than a pair of fmul and fadd
1026 /// instructions. fmuladd intrinsics will be expanded to FMAs when this
1027 /// method returns true, otherwise fmuladd is expanded to fmul + fadd.
1028 bool isFMAFasterThanFMulAndFAdd(EVT VT) const override;
1030 /// Return true if it's profitable to narrow
1031 /// operations of type VT1 to VT2. e.g. on x86, it's profitable to narrow
1032 /// from i32 to i8 but not from i32 to i16.
1033 bool isNarrowingProfitable(EVT VT1, EVT VT2) const override;
1035 /// Given an intrinsic, checks if on the target the intrinsic will need to map
1036 /// to a MemIntrinsicNode (touches memory). If this is the case, it returns
1037 /// true and stores the intrinsic information into the IntrinsicInfo that was
1038 /// passed to the function.
1039 bool getTgtMemIntrinsic(IntrinsicInfo &Info, const CallInst &I,
1040 MachineFunction &MF,
1041 unsigned Intrinsic) const override;
1043 /// Returns true if the target can instruction select the
1044 /// specified FP immediate natively. If false, the legalizer will
1045 /// materialize the FP immediate as a load from a constant pool.
1046 bool isFPImmLegal(const APFloat &Imm, EVT VT,
1047 bool ForCodeSize) const override;
1049 /// Targets can use this to indicate that they only support *some*
1050 /// VECTOR_SHUFFLE operations, those with specific masks. By default, if a
1051 /// target supports the VECTOR_SHUFFLE node, all mask values are assumed to
1053 bool isShuffleMaskLegal(ArrayRef<int> Mask, EVT VT) const override;
1055 /// Similar to isShuffleMaskLegal. Targets can use this to indicate if there
1056 /// is a suitable VECTOR_SHUFFLE that can be used to replace a VAND with a
1057 /// constant pool entry.
1058 bool isVectorClearMaskLegal(ArrayRef<int> Mask, EVT VT) const override;
1060 /// Returns true if lowering to a jump table is allowed.
1061 bool areJTsAllowed(const Function *Fn) const override;
1063 /// If true, then instruction selection should
1064 /// seek to shrink the FP constant of the specified type to a smaller type
1065 /// in order to save space and / or reduce runtime.
1066 bool ShouldShrinkFPConstant(EVT VT) const override {
1067 // Don't shrink FP constpool if SSE2 is available since cvtss2sd is more
1068 // expensive than a straight movsd. On the other hand, it's important to
1069 // shrink long double fp constant since fldt is very slow.
1070 return !X86ScalarSSEf64 || VT == MVT::f80;
1073 /// Return true if we believe it is correct and profitable to reduce the
1074 /// load node to a smaller type.
1075 bool shouldReduceLoadWidth(SDNode *Load, ISD::LoadExtType ExtTy,
1076 EVT NewVT) const override;
1078 /// Return true if the specified scalar FP type is computed in an SSE
1079 /// register, not on the X87 floating point stack.
1080 bool isScalarFPTypeInSSEReg(EVT VT) const {
1081 return (VT == MVT::f64 && X86ScalarSSEf64) || // f64 is when SSE2
1082 (VT == MVT::f32 && X86ScalarSSEf32); // f32 is when SSE1
1085 /// Returns true if it is beneficial to convert a load of a constant
1086 /// to just the constant itself.
1087 bool shouldConvertConstantLoadToIntImm(const APInt &Imm,
1088 Type *Ty) const override;
1090 bool reduceSelectOfFPConstantLoads(bool IsFPSetCC) const override;
1092 bool convertSelectOfConstantsToMath(EVT VT) const override;
1094 bool decomposeMulByConstant(EVT VT, SDValue C) const override;
1096 bool shouldUseStrictFP_TO_INT(EVT FpVT, EVT IntVT,
1097 bool IsSigned) const override;
1099 /// Return true if EXTRACT_SUBVECTOR is cheap for this result type
1100 /// with this index.
1101 bool isExtractSubvectorCheap(EVT ResVT, EVT SrcVT,
1102 unsigned Index) const override;
1104 /// Scalar ops always have equal or better analysis/performance/power than
1105 /// the vector equivalent, so this always makes sense if the scalar op is
1107 bool shouldScalarizeBinop(SDValue) const override;
1109 /// Extract of a scalar FP value from index 0 of a vector is free.
1110 bool isExtractVecEltCheap(EVT VT, unsigned Index) const override {
1111 EVT EltVT = VT.getScalarType();
1112 return (EltVT == MVT::f32 || EltVT == MVT::f64) && Index == 0;
1115 /// Overflow nodes should get combined/lowered to optimal instructions
1116 /// (they should allow eliminating explicit compares by getting flags from
1118 bool shouldFormOverflowOp(unsigned Opcode, EVT VT) const override;
1120 bool storeOfVectorConstantIsCheap(EVT MemVT, unsigned NumElem,
1121 unsigned AddrSpace) const override {
1122 // If we can replace more than 2 scalar stores, there will be a reduction
1123 // in instructions even after we add a vector constant load.
1127 bool isLoadBitCastBeneficial(EVT LoadVT, EVT BitcastVT,
1128 const SelectionDAG &DAG,
1129 const MachineMemOperand &MMO) const override;
1131 /// Intel processors have a unified instruction and data cache
1132 const char * getClearCacheBuiltinName() const override {
1133 return nullptr; // nothing to do, move along.
1136 unsigned getRegisterByName(const char* RegName, EVT VT,
1137 SelectionDAG &DAG) const override;
1139 /// If a physical register, this returns the register that receives the
1140 /// exception address on entry to an EH pad.
1142 getExceptionPointerRegister(const Constant *PersonalityFn) const override;
1144 /// If a physical register, this returns the register that receives the
1145 /// exception typeid on entry to a landing pad.
1147 getExceptionSelectorRegister(const Constant *PersonalityFn) const override;
1149 virtual bool needsFixedCatchObjects() const override;
1151 /// This method returns a target specific FastISel object,
1152 /// or null if the target does not support "fast" ISel.
1153 FastISel *createFastISel(FunctionLoweringInfo &funcInfo,
1154 const TargetLibraryInfo *libInfo) const override;
1156 /// If the target has a standard location for the stack protector cookie,
1157 /// returns the address of that location. Otherwise, returns nullptr.
1158 Value *getIRStackGuard(IRBuilder<> &IRB) const override;
1160 bool useLoadStackGuardNode() const override;
1161 bool useStackGuardXorFP() const override;
1162 void insertSSPDeclarations(Module &M) const override;
1163 Value *getSDagStackGuard(const Module &M) const override;
1164 Function *getSSPStackGuardCheck(const Module &M) const override;
1165 SDValue emitStackGuardXorFP(SelectionDAG &DAG, SDValue Val,
1166 const SDLoc &DL) const override;
1169 /// Return true if the target stores SafeStack pointer at a fixed offset in
1170 /// some non-standard address space, and populates the address space and
1171 /// offset as appropriate.
1172 Value *getSafeStackPointerLocation(IRBuilder<> &IRB) const override;
1174 SDValue BuildFILD(SDValue Op, EVT SrcVT, SDValue Chain, SDValue StackSlot,
1175 SelectionDAG &DAG) const;
1177 bool isNoopAddrSpaceCast(unsigned SrcAS, unsigned DestAS) const override;
1179 /// Customize the preferred legalization strategy for certain types.
1180 LegalizeTypeAction getPreferredVectorAction(MVT VT) const override;
1182 MVT getRegisterTypeForCallingConv(LLVMContext &Context, CallingConv::ID CC,
1183 EVT VT) const override;
1185 unsigned getNumRegistersForCallingConv(LLVMContext &Context,
1187 EVT VT) const override;
1189 bool isIntDivCheap(EVT VT, AttributeList Attr) const override;
1191 bool supportSwiftError() const override;
1193 StringRef getStackProbeSymbolName(MachineFunction &MF) const override;
1195 bool hasVectorBlend() const override { return true; }
1197 unsigned getMaxSupportedInterleaveFactor() const override { return 4; }
1199 /// Lower interleaved load(s) into target specific
1200 /// instructions/intrinsics.
1201 bool lowerInterleavedLoad(LoadInst *LI,
1202 ArrayRef<ShuffleVectorInst *> Shuffles,
1203 ArrayRef<unsigned> Indices,
1204 unsigned Factor) const override;
1206 /// Lower interleaved store(s) into target specific
1207 /// instructions/intrinsics.
1208 bool lowerInterleavedStore(StoreInst *SI, ShuffleVectorInst *SVI,
1209 unsigned Factor) const override;
1211 SDValue expandIndirectJTBranch(const SDLoc& dl, SDValue Value,
1212 SDValue Addr, SelectionDAG &DAG)
1216 std::pair<const TargetRegisterClass *, uint8_t>
1217 findRepresentativeClass(const TargetRegisterInfo *TRI,
1218 MVT VT) const override;
1221 /// Keep a reference to the X86Subtarget around so that we can
1222 /// make the right decision when generating code for different targets.
1223 const X86Subtarget &Subtarget;
1225 /// Select between SSE or x87 floating point ops.
1226 /// When SSE is available, use it for f32 operations.
1227 /// When SSE2 is available, use it for f64 operations.
1228 bool X86ScalarSSEf32;
1229 bool X86ScalarSSEf64;
1231 /// A list of legal FP immediates.
1232 std::vector<APFloat> LegalFPImmediates;
1234 /// Indicate that this x86 target can instruction
1235 /// select the specified FP immediate natively.
1236 void addLegalFPImmediate(const APFloat& Imm) {
1237 LegalFPImmediates.push_back(Imm);
1240 SDValue LowerCallResult(SDValue Chain, SDValue InFlag,
1241 CallingConv::ID CallConv, bool isVarArg,
1242 const SmallVectorImpl<ISD::InputArg> &Ins,
1243 const SDLoc &dl, SelectionDAG &DAG,
1244 SmallVectorImpl<SDValue> &InVals,
1245 uint32_t *RegMask) const;
1246 SDValue LowerMemArgument(SDValue Chain, CallingConv::ID CallConv,
1247 const SmallVectorImpl<ISD::InputArg> &ArgInfo,
1248 const SDLoc &dl, SelectionDAG &DAG,
1249 const CCValAssign &VA, MachineFrameInfo &MFI,
1251 SDValue LowerMemOpCallTo(SDValue Chain, SDValue StackPtr, SDValue Arg,
1252 const SDLoc &dl, SelectionDAG &DAG,
1253 const CCValAssign &VA,
1254 ISD::ArgFlagsTy Flags) const;
1256 // Call lowering helpers.
1258 /// Check whether the call is eligible for tail call optimization. Targets
1259 /// that want to do tail call optimization should implement this function.
1260 bool IsEligibleForTailCallOptimization(SDValue Callee,
1261 CallingConv::ID CalleeCC,
1263 bool isCalleeStructRet,
1264 bool isCallerStructRet,
1266 const SmallVectorImpl<ISD::OutputArg> &Outs,
1267 const SmallVectorImpl<SDValue> &OutVals,
1268 const SmallVectorImpl<ISD::InputArg> &Ins,
1269 SelectionDAG& DAG) const;
1270 SDValue EmitTailCallLoadRetAddr(SelectionDAG &DAG, SDValue &OutRetAddr,
1271 SDValue Chain, bool IsTailCall,
1272 bool Is64Bit, int FPDiff,
1273 const SDLoc &dl) const;
1275 unsigned GetAlignedArgumentStackSize(unsigned StackSize,
1276 SelectionDAG &DAG) const;
1278 unsigned getAddressSpace(void) const;
1280 SDValue FP_TO_INTHelper(SDValue Op, SelectionDAG &DAG, bool isSigned) const;
1282 SDValue LowerBUILD_VECTOR(SDValue Op, SelectionDAG &DAG) const;
1283 SDValue LowerVSELECT(SDValue Op, SelectionDAG &DAG) const;
1284 SDValue LowerEXTRACT_VECTOR_ELT(SDValue Op, SelectionDAG &DAG) const;
1285 SDValue LowerINSERT_VECTOR_ELT(SDValue Op, SelectionDAG &DAG) const;
1287 unsigned getGlobalWrapperKind(const GlobalValue *GV = nullptr,
1288 const unsigned char OpFlags = 0) const;
1289 SDValue LowerConstantPool(SDValue Op, SelectionDAG &DAG) const;
1290 SDValue LowerBlockAddress(SDValue Op, SelectionDAG &DAG) const;
1291 SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const;
1292 SDValue LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const;
1293 SDValue LowerExternalSymbol(SDValue Op, SelectionDAG &DAG) const;
1295 /// Creates target global address or external symbol nodes for calls or
1297 SDValue LowerGlobalOrExternal(SDValue Op, SelectionDAG &DAG,
1298 bool ForCall) const;
1300 SDValue LowerSINT_TO_FP(SDValue Op, SelectionDAG &DAG) const;
1301 SDValue LowerUINT_TO_FP(SDValue Op, SelectionDAG &DAG) const;
1302 SDValue LowerTRUNCATE(SDValue Op, SelectionDAG &DAG) const;
1303 SDValue LowerFP_TO_INT(SDValue Op, SelectionDAG &DAG) const;
1304 SDValue LowerSETCC(SDValue Op, SelectionDAG &DAG) const;
1305 SDValue LowerSETCCCARRY(SDValue Op, SelectionDAG &DAG) const;
1306 SDValue LowerSELECT(SDValue Op, SelectionDAG &DAG) const;
1307 SDValue LowerBRCOND(SDValue Op, SelectionDAG &DAG) const;
1308 SDValue LowerJumpTable(SDValue Op, SelectionDAG &DAG) const;
1309 SDValue LowerDYNAMIC_STACKALLOC(SDValue Op, SelectionDAG &DAG) const;
1310 SDValue LowerVASTART(SDValue Op, SelectionDAG &DAG) const;
1311 SDValue LowerVAARG(SDValue Op, SelectionDAG &DAG) const;
1312 SDValue LowerRETURNADDR(SDValue Op, SelectionDAG &DAG) const;
1313 SDValue LowerADDROFRETURNADDR(SDValue Op, SelectionDAG &DAG) const;
1314 SDValue LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const;
1315 SDValue LowerFRAME_TO_ARGS_OFFSET(SDValue Op, SelectionDAG &DAG) const;
1316 SDValue LowerEH_RETURN(SDValue Op, SelectionDAG &DAG) const;
1317 SDValue lowerEH_SJLJ_SETJMP(SDValue Op, SelectionDAG &DAG) const;
1318 SDValue lowerEH_SJLJ_LONGJMP(SDValue Op, SelectionDAG &DAG) const;
1319 SDValue lowerEH_SJLJ_SETUP_DISPATCH(SDValue Op, SelectionDAG &DAG) const;
1320 SDValue LowerINIT_TRAMPOLINE(SDValue Op, SelectionDAG &DAG) const;
1321 SDValue LowerFLT_ROUNDS_(SDValue Op, SelectionDAG &DAG) const;
1322 SDValue LowerWin64_i128OP(SDValue Op, SelectionDAG &DAG) const;
1323 SDValue LowerGC_TRANSITION_START(SDValue Op, SelectionDAG &DAG) const;
1324 SDValue LowerGC_TRANSITION_END(SDValue Op, SelectionDAG &DAG) const;
1325 SDValue LowerINTRINSIC_WO_CHAIN(SDValue Op, SelectionDAG &DAG) const;
1328 LowerFormalArguments(SDValue Chain, CallingConv::ID CallConv, bool isVarArg,
1329 const SmallVectorImpl<ISD::InputArg> &Ins,
1330 const SDLoc &dl, SelectionDAG &DAG,
1331 SmallVectorImpl<SDValue> &InVals) const override;
1332 SDValue LowerCall(CallLoweringInfo &CLI,
1333 SmallVectorImpl<SDValue> &InVals) const override;
1335 SDValue LowerReturn(SDValue Chain, CallingConv::ID CallConv, bool isVarArg,
1336 const SmallVectorImpl<ISD::OutputArg> &Outs,
1337 const SmallVectorImpl<SDValue> &OutVals,
1338 const SDLoc &dl, SelectionDAG &DAG) const override;
1340 bool supportSplitCSR(MachineFunction *MF) const override {
1341 return MF->getFunction().getCallingConv() == CallingConv::CXX_FAST_TLS &&
1342 MF->getFunction().hasFnAttribute(Attribute::NoUnwind);
1344 void initializeSplitCSR(MachineBasicBlock *Entry) const override;
1345 void insertCopiesSplitCSR(
1346 MachineBasicBlock *Entry,
1347 const SmallVectorImpl<MachineBasicBlock *> &Exits) const override;
1349 bool isUsedByReturnOnly(SDNode *N, SDValue &Chain) const override;
1351 bool mayBeEmittedAsTailCall(const CallInst *CI) const override;
1353 EVT getTypeForExtReturn(LLVMContext &Context, EVT VT,
1354 ISD::NodeType ExtendKind) const override;
1356 bool CanLowerReturn(CallingConv::ID CallConv, MachineFunction &MF,
1358 const SmallVectorImpl<ISD::OutputArg> &Outs,
1359 LLVMContext &Context) const override;
1361 const MCPhysReg *getScratchRegisters(CallingConv::ID CC) const override;
1363 TargetLoweringBase::AtomicExpansionKind
1364 shouldExpandAtomicLoadInIR(LoadInst *SI) const override;
1365 bool shouldExpandAtomicStoreInIR(StoreInst *SI) const override;
1366 TargetLoweringBase::AtomicExpansionKind
1367 shouldExpandAtomicRMWInIR(AtomicRMWInst *AI) const override;
1370 lowerIdempotentRMWIntoFencedLoad(AtomicRMWInst *AI) const override;
1372 bool needsCmpXchgNb(Type *MemType) const;
1374 void SetupEntryBlockForSjLj(MachineInstr &MI, MachineBasicBlock *MBB,
1375 MachineBasicBlock *DispatchBB, int FI) const;
1377 // Utility function to emit the low-level va_arg code for X86-64.
1379 EmitVAARG64WithCustomInserter(MachineInstr &MI,
1380 MachineBasicBlock *MBB) const;
1382 /// Utility function to emit the xmm reg save portion of va_start.
1384 EmitVAStartSaveXMMRegsWithCustomInserter(MachineInstr &BInstr,
1385 MachineBasicBlock *BB) const;
1387 MachineBasicBlock *EmitLoweredCascadedSelect(MachineInstr &MI1,
1389 MachineBasicBlock *BB) const;
1391 MachineBasicBlock *EmitLoweredSelect(MachineInstr &I,
1392 MachineBasicBlock *BB) const;
1394 MachineBasicBlock *EmitLoweredAtomicFP(MachineInstr &I,
1395 MachineBasicBlock *BB) const;
1397 MachineBasicBlock *EmitLoweredCatchRet(MachineInstr &MI,
1398 MachineBasicBlock *BB) const;
1400 MachineBasicBlock *EmitLoweredCatchPad(MachineInstr &MI,
1401 MachineBasicBlock *BB) const;
1403 MachineBasicBlock *EmitLoweredSegAlloca(MachineInstr &MI,
1404 MachineBasicBlock *BB) const;
1406 MachineBasicBlock *EmitLoweredTLSAddr(MachineInstr &MI,
1407 MachineBasicBlock *BB) const;
1409 MachineBasicBlock *EmitLoweredTLSCall(MachineInstr &MI,
1410 MachineBasicBlock *BB) const;
1412 MachineBasicBlock *EmitLoweredRetpoline(MachineInstr &MI,
1413 MachineBasicBlock *BB) const;
1415 MachineBasicBlock *emitEHSjLjSetJmp(MachineInstr &MI,
1416 MachineBasicBlock *MBB) const;
1418 void emitSetJmpShadowStackFix(MachineInstr &MI,
1419 MachineBasicBlock *MBB) const;
1421 MachineBasicBlock *emitEHSjLjLongJmp(MachineInstr &MI,
1422 MachineBasicBlock *MBB) const;
1424 MachineBasicBlock *emitLongJmpShadowStackFix(MachineInstr &MI,
1425 MachineBasicBlock *MBB) const;
1427 MachineBasicBlock *emitFMA3Instr(MachineInstr &MI,
1428 MachineBasicBlock *MBB) const;
1430 MachineBasicBlock *EmitSjLjDispatchBlock(MachineInstr &MI,
1431 MachineBasicBlock *MBB) const;
1433 /// Emit nodes that will be selected as "cmp Op0,Op1", or something
1434 /// equivalent, for use with the given x86 condition code.
1435 SDValue EmitCmp(SDValue Op0, SDValue Op1, unsigned X86CC, const SDLoc &dl,
1436 SelectionDAG &DAG) const;
1438 /// Convert a comparison if required by the subtarget.
1439 SDValue ConvertCmpIfNecessary(SDValue Cmp, SelectionDAG &DAG) const;
1441 /// Emit flags for the given setcc condition and operands. Also returns the
1442 /// corresponding X86 condition code constant in X86CC.
1443 SDValue emitFlagsForSetcc(SDValue Op0, SDValue Op1,
1444 ISD::CondCode CC, const SDLoc &dl,
1446 SDValue &X86CC) const;
1448 /// Check if replacement of SQRT with RSQRT should be disabled.
1449 bool isFsqrtCheap(SDValue Operand, SelectionDAG &DAG) const override;
1451 /// Use rsqrt* to speed up sqrt calculations.
1452 SDValue getSqrtEstimate(SDValue Operand, SelectionDAG &DAG, int Enabled,
1453 int &RefinementSteps, bool &UseOneConstNR,
1454 bool Reciprocal) const override;
1456 /// Use rcp* to speed up fdiv calculations.
1457 SDValue getRecipEstimate(SDValue Operand, SelectionDAG &DAG, int Enabled,
1458 int &RefinementSteps) const override;
1460 /// Reassociate floating point divisions into multiply by reciprocal.
1461 unsigned combineRepeatedFPDivisors() const override;
1465 FastISel *createFastISel(FunctionLoweringInfo &funcInfo,
1466 const TargetLibraryInfo *libInfo);
1467 } // end namespace X86
1469 // Base class for all X86 non-masked store operations.
1470 class X86StoreSDNode : public MemSDNode {
1472 X86StoreSDNode(unsigned Opcode, unsigned Order, const DebugLoc &dl,
1473 SDVTList VTs, EVT MemVT,
1474 MachineMemOperand *MMO)
1475 :MemSDNode(Opcode, Order, dl, VTs, MemVT, MMO) {}
1476 const SDValue &getValue() const { return getOperand(1); }
1477 const SDValue &getBasePtr() const { return getOperand(2); }
1479 static bool classof(const SDNode *N) {
1480 return N->getOpcode() == X86ISD::VTRUNCSTORES ||
1481 N->getOpcode() == X86ISD::VTRUNCSTOREUS;
1485 // Base class for all X86 masked store operations.
1486 // The class has the same order of operands as MaskedStoreSDNode for
1488 class X86MaskedStoreSDNode : public MemSDNode {
1490 X86MaskedStoreSDNode(unsigned Opcode, unsigned Order,
1491 const DebugLoc &dl, SDVTList VTs, EVT MemVT,
1492 MachineMemOperand *MMO)
1493 : MemSDNode(Opcode, Order, dl, VTs, MemVT, MMO) {}
1495 const SDValue &getValue() const { return getOperand(1); }
1496 const SDValue &getBasePtr() const { return getOperand(2); }
1497 const SDValue &getMask() const { return getOperand(3); }
1499 static bool classof(const SDNode *N) {
1500 return N->getOpcode() == X86ISD::VMTRUNCSTORES ||
1501 N->getOpcode() == X86ISD::VMTRUNCSTOREUS;
1505 // X86 Truncating Store with Signed saturation.
1506 class TruncSStoreSDNode : public X86StoreSDNode {
1508 TruncSStoreSDNode(unsigned Order, const DebugLoc &dl,
1509 SDVTList VTs, EVT MemVT, MachineMemOperand *MMO)
1510 : X86StoreSDNode(X86ISD::VTRUNCSTORES, Order, dl, VTs, MemVT, MMO) {}
1512 static bool classof(const SDNode *N) {
1513 return N->getOpcode() == X86ISD::VTRUNCSTORES;
1517 // X86 Truncating Store with Unsigned saturation.
1518 class TruncUSStoreSDNode : public X86StoreSDNode {
1520 TruncUSStoreSDNode(unsigned Order, const DebugLoc &dl,
1521 SDVTList VTs, EVT MemVT, MachineMemOperand *MMO)
1522 : X86StoreSDNode(X86ISD::VTRUNCSTOREUS, Order, dl, VTs, MemVT, MMO) {}
1524 static bool classof(const SDNode *N) {
1525 return N->getOpcode() == X86ISD::VTRUNCSTOREUS;
1529 // X86 Truncating Masked Store with Signed saturation.
1530 class MaskedTruncSStoreSDNode : public X86MaskedStoreSDNode {
1532 MaskedTruncSStoreSDNode(unsigned Order,
1533 const DebugLoc &dl, SDVTList VTs, EVT MemVT,
1534 MachineMemOperand *MMO)
1535 : X86MaskedStoreSDNode(X86ISD::VMTRUNCSTORES, Order, dl, VTs, MemVT, MMO) {}
1537 static bool classof(const SDNode *N) {
1538 return N->getOpcode() == X86ISD::VMTRUNCSTORES;
1542 // X86 Truncating Masked Store with Unsigned saturation.
1543 class MaskedTruncUSStoreSDNode : public X86MaskedStoreSDNode {
1545 MaskedTruncUSStoreSDNode(unsigned Order,
1546 const DebugLoc &dl, SDVTList VTs, EVT MemVT,
1547 MachineMemOperand *MMO)
1548 : X86MaskedStoreSDNode(X86ISD::VMTRUNCSTOREUS, Order, dl, VTs, MemVT, MMO) {}
1550 static bool classof(const SDNode *N) {
1551 return N->getOpcode() == X86ISD::VMTRUNCSTOREUS;
1555 // X86 specific Gather/Scatter nodes.
1556 // The class has the same order of operands as MaskedGatherScatterSDNode for
1558 class X86MaskedGatherScatterSDNode : public MemSDNode {
1560 X86MaskedGatherScatterSDNode(unsigned Opc, unsigned Order,
1561 const DebugLoc &dl, SDVTList VTs, EVT MemVT,
1562 MachineMemOperand *MMO)
1563 : MemSDNode(Opc, Order, dl, VTs, MemVT, MMO) {}
1565 const SDValue &getBasePtr() const { return getOperand(3); }
1566 const SDValue &getIndex() const { return getOperand(4); }
1567 const SDValue &getMask() const { return getOperand(2); }
1568 const SDValue &getScale() const { return getOperand(5); }
1570 static bool classof(const SDNode *N) {
1571 return N->getOpcode() == X86ISD::MGATHER ||
1572 N->getOpcode() == X86ISD::MSCATTER;
1576 class X86MaskedGatherSDNode : public X86MaskedGatherScatterSDNode {
1578 X86MaskedGatherSDNode(unsigned Order, const DebugLoc &dl, SDVTList VTs,
1579 EVT MemVT, MachineMemOperand *MMO)
1580 : X86MaskedGatherScatterSDNode(X86ISD::MGATHER, Order, dl, VTs, MemVT,
1583 const SDValue &getPassThru() const { return getOperand(1); }
1585 static bool classof(const SDNode *N) {
1586 return N->getOpcode() == X86ISD::MGATHER;
1590 class X86MaskedScatterSDNode : public X86MaskedGatherScatterSDNode {
1592 X86MaskedScatterSDNode(unsigned Order, const DebugLoc &dl, SDVTList VTs,
1593 EVT MemVT, MachineMemOperand *MMO)
1594 : X86MaskedGatherScatterSDNode(X86ISD::MSCATTER, Order, dl, VTs, MemVT,
1597 const SDValue &getValue() const { return getOperand(1); }
1599 static bool classof(const SDNode *N) {
1600 return N->getOpcode() == X86ISD::MSCATTER;
1604 /// Generate unpacklo/unpackhi shuffle mask.
1605 template <typename T = int>
1606 void createUnpackShuffleMask(MVT VT, SmallVectorImpl<T> &Mask, bool Lo,
1608 assert(Mask.empty() && "Expected an empty shuffle mask vector");
1609 int NumElts = VT.getVectorNumElements();
1610 int NumEltsInLane = 128 / VT.getScalarSizeInBits();
1611 for (int i = 0; i < NumElts; ++i) {
1612 unsigned LaneStart = (i / NumEltsInLane) * NumEltsInLane;
1613 int Pos = (i % NumEltsInLane) / 2 + LaneStart;
1614 Pos += (Unary ? 0 : NumElts * (i % 2));
1615 Pos += (Lo ? 0 : NumEltsInLane / 2);
1616 Mask.push_back(Pos);
1620 /// Helper function to scale a shuffle or target shuffle mask, replacing each
1621 /// mask index with the scaled sequential indices for an equivalent narrowed
1622 /// mask. This is the reverse process to canWidenShuffleElements, but can
1624 template <typename T>
1625 void scaleShuffleMask(int Scale, ArrayRef<T> Mask,
1626 SmallVectorImpl<T> &ScaledMask) {
1627 assert(0 < Scale && "Unexpected scaling factor");
1628 size_t NumElts = Mask.size();
1629 ScaledMask.assign(NumElts * Scale, -1);
1631 for (int i = 0; i != (int)NumElts; ++i) {
1634 // Repeat sentinel values in every mask element.
1636 for (int s = 0; s != Scale; ++s)
1637 ScaledMask[(Scale * i) + s] = M;
1641 // Scale mask element and increment across each mask element.
1642 for (int s = 0; s != Scale; ++s)
1643 ScaledMask[(Scale * i) + s] = (Scale * M) + s;
1646 } // end namespace llvm
1648 #endif // LLVM_LIB_TARGET_X86_X86ISELLOWERING_H