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https://github.com/c64scene-ar/llvm-6502.git
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66b12088cb
This is a new iteration of the reverted r238793 / http://reviews.llvm.org/D8232 which wrongly assumed that any and/or trees can be represented by conditional compare sequences, however there are some restrictions to that. This version fixes this and adds comments that explain exactly what types of and/or trees can actually be implemented as conditional compare sequences. Related to http://llvm.org/PR20927, rdar://18326194 Differential Revision: http://reviews.llvm.org/D10579 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@242436 91177308-0d34-0410-b5e6-96231b3b80d8
536 lines
19 KiB
C++
536 lines
19 KiB
C++
//==-- AArch64ISelLowering.h - AArch64 DAG Lowering Interface ----*- C++ -*-==//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the interfaces that AArch64 uses to lower LLVM code into a
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// selection DAG.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_AARCH64_AARCH64ISELLOWERING_H
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#define LLVM_LIB_TARGET_AARCH64_AARCH64ISELLOWERING_H
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#include "llvm/CodeGen/CallingConvLower.h"
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#include "llvm/CodeGen/SelectionDAG.h"
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#include "llvm/IR/CallingConv.h"
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#include "llvm/IR/Instruction.h"
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#include "llvm/Target/TargetLowering.h"
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namespace llvm {
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namespace AArch64ISD {
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enum NodeType : unsigned {
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FIRST_NUMBER = ISD::BUILTIN_OP_END,
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WrapperLarge, // 4-instruction MOVZ/MOVK sequence for 64-bit addresses.
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CALL, // Function call.
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// Produces the full sequence of instructions for getting the thread pointer
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// offset of a variable into X0, using the TLSDesc model.
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TLSDESC_CALLSEQ,
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ADRP, // Page address of a TargetGlobalAddress operand.
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ADDlow, // Add the low 12 bits of a TargetGlobalAddress operand.
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LOADgot, // Load from automatically generated descriptor (e.g. Global
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// Offset Table, TLS record).
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RET_FLAG, // Return with a flag operand. Operand 0 is the chain operand.
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BRCOND, // Conditional branch instruction; "b.cond".
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CSEL,
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FCSEL, // Conditional move instruction.
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CSINV, // Conditional select invert.
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CSNEG, // Conditional select negate.
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CSINC, // Conditional select increment.
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// Pointer to the thread's local storage area. Materialised from TPIDR_EL0 on
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// ELF.
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THREAD_POINTER,
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ADC,
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SBC, // adc, sbc instructions
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// Arithmetic instructions which write flags.
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ADDS,
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SUBS,
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ADCS,
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SBCS,
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ANDS,
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// Conditional compares. Operands: left,right,falsecc,cc,flags
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CCMP,
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CCMN,
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FCCMP,
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// Floating point comparison
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FCMP,
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// Floating point max and min instructions.
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FMAX,
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FMIN,
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// Scalar extract
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EXTR,
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// Scalar-to-vector duplication
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DUP,
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DUPLANE8,
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DUPLANE16,
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DUPLANE32,
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DUPLANE64,
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// Vector immedate moves
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MOVI,
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MOVIshift,
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MOVIedit,
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MOVImsl,
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FMOV,
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MVNIshift,
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MVNImsl,
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// Vector immediate ops
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BICi,
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ORRi,
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// Vector bit select: similar to ISD::VSELECT but not all bits within an
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// element must be identical.
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BSL,
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// Vector arithmetic negation
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NEG,
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// Vector shuffles
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ZIP1,
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ZIP2,
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UZP1,
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UZP2,
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TRN1,
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TRN2,
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REV16,
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REV32,
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REV64,
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EXT,
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// Vector shift by scalar
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VSHL,
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VLSHR,
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VASHR,
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// Vector shift by scalar (again)
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SQSHL_I,
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UQSHL_I,
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SQSHLU_I,
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SRSHR_I,
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URSHR_I,
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// Vector comparisons
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CMEQ,
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CMGE,
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CMGT,
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CMHI,
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CMHS,
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FCMEQ,
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FCMGE,
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FCMGT,
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// Vector zero comparisons
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CMEQz,
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CMGEz,
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CMGTz,
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CMLEz,
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CMLTz,
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FCMEQz,
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FCMGEz,
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FCMGTz,
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FCMLEz,
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FCMLTz,
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// Vector across-lanes addition
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// Only the lower result lane is defined.
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SADDV,
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UADDV,
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// Vector across-lanes min/max
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// Only the lower result lane is defined.
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SMINV,
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UMINV,
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SMAXV,
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UMAXV,
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// Vector bitwise negation
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NOT,
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// Vector bitwise selection
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BIT,
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// Compare-and-branch
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CBZ,
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CBNZ,
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TBZ,
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TBNZ,
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// Tail calls
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TC_RETURN,
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// Custom prefetch handling
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PREFETCH,
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// {s|u}int to FP within a FP register.
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SITOF,
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UITOF,
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/// Natural vector cast. ISD::BITCAST is not natural in the big-endian
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/// world w.r.t vectors; which causes additional REV instructions to be
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/// generated to compensate for the byte-swapping. But sometimes we do
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/// need to re-interpret the data in SIMD vector registers in big-endian
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/// mode without emitting such REV instructions.
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NVCAST,
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SMULL,
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UMULL,
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// NEON Load/Store with post-increment base updates
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LD2post = ISD::FIRST_TARGET_MEMORY_OPCODE,
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LD3post,
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LD4post,
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ST2post,
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ST3post,
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ST4post,
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LD1x2post,
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LD1x3post,
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LD1x4post,
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ST1x2post,
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ST1x3post,
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ST1x4post,
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LD1DUPpost,
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LD2DUPpost,
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LD3DUPpost,
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LD4DUPpost,
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LD1LANEpost,
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LD2LANEpost,
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LD3LANEpost,
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LD4LANEpost,
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ST2LANEpost,
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ST3LANEpost,
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ST4LANEpost
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};
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} // end namespace AArch64ISD
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class AArch64Subtarget;
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class AArch64TargetMachine;
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class AArch64TargetLowering : public TargetLowering {
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bool RequireStrictAlign;
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public:
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explicit AArch64TargetLowering(const TargetMachine &TM,
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const AArch64Subtarget &STI);
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/// Selects the correct CCAssignFn for a given CallingConvention value.
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CCAssignFn *CCAssignFnForCall(CallingConv::ID CC, bool IsVarArg) const;
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/// computeKnownBitsForTargetNode - Determine which of the bits specified in
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/// Mask are known to be either zero or one and return them in the
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/// KnownZero/KnownOne bitsets.
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void computeKnownBitsForTargetNode(const SDValue Op, APInt &KnownZero,
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APInt &KnownOne, const SelectionDAG &DAG,
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unsigned Depth = 0) const override;
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MVT getScalarShiftAmountTy(const DataLayout &DL, EVT) const override;
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/// allowsMisalignedMemoryAccesses - Returns true if the target allows
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/// unaligned memory accesses of the specified type.
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bool allowsMisalignedMemoryAccesses(EVT VT, unsigned AddrSpace = 0,
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unsigned Align = 1,
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bool *Fast = nullptr) const override {
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if (RequireStrictAlign)
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return false;
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// FIXME: True for Cyclone, but not necessary others.
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if (Fast)
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*Fast = true;
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return true;
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}
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/// LowerOperation - Provide custom lowering hooks for some operations.
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SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const override;
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const char *getTargetNodeName(unsigned Opcode) const override;
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SDValue PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const override;
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/// getFunctionAlignment - Return the Log2 alignment of this function.
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unsigned getFunctionAlignment(const Function *F) const;
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/// Returns true if a cast between SrcAS and DestAS is a noop.
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bool isNoopAddrSpaceCast(unsigned SrcAS, unsigned DestAS) const override {
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// Addrspacecasts are always noops.
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return true;
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}
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/// createFastISel - This method returns a target specific FastISel object,
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/// or null if the target does not support "fast" ISel.
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FastISel *createFastISel(FunctionLoweringInfo &funcInfo,
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const TargetLibraryInfo *libInfo) const override;
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bool isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const override;
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bool isFPImmLegal(const APFloat &Imm, EVT VT) const override;
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/// isShuffleMaskLegal - Return true if the given shuffle mask can be
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/// codegen'd directly, or if it should be stack expanded.
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bool isShuffleMaskLegal(const SmallVectorImpl<int> &M, EVT VT) const override;
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/// getSetCCResultType - Return the ISD::SETCC ValueType
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EVT getSetCCResultType(const DataLayout &DL, LLVMContext &Context,
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EVT VT) const override;
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SDValue ReconstructShuffle(SDValue Op, SelectionDAG &DAG) const;
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MachineBasicBlock *EmitF128CSEL(MachineInstr *MI,
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MachineBasicBlock *BB) const;
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MachineBasicBlock *
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EmitInstrWithCustomInserter(MachineInstr *MI,
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MachineBasicBlock *MBB) const override;
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bool getTgtMemIntrinsic(IntrinsicInfo &Info, const CallInst &I,
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unsigned Intrinsic) const override;
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bool isTruncateFree(Type *Ty1, Type *Ty2) const override;
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bool isTruncateFree(EVT VT1, EVT VT2) const override;
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bool isProfitableToHoist(Instruction *I) const override;
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bool isZExtFree(Type *Ty1, Type *Ty2) const override;
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bool isZExtFree(EVT VT1, EVT VT2) const override;
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bool isZExtFree(SDValue Val, EVT VT2) const override;
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bool hasPairedLoad(Type *LoadedType,
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unsigned &RequiredAligment) const override;
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bool hasPairedLoad(EVT LoadedType, unsigned &RequiredAligment) const override;
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unsigned getMaxSupportedInterleaveFactor() const override { return 4; }
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bool lowerInterleavedLoad(LoadInst *LI,
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ArrayRef<ShuffleVectorInst *> Shuffles,
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ArrayRef<unsigned> Indices,
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unsigned Factor) const override;
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bool lowerInterleavedStore(StoreInst *SI, ShuffleVectorInst *SVI,
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unsigned Factor) const override;
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bool isLegalAddImmediate(int64_t) const override;
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bool isLegalICmpImmediate(int64_t) const override;
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EVT getOptimalMemOpType(uint64_t Size, unsigned DstAlign, unsigned SrcAlign,
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bool IsMemset, bool ZeroMemset, bool MemcpyStrSrc,
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MachineFunction &MF) const override;
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/// isLegalAddressingMode - Return true if the addressing mode represented
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/// by AM is legal for this target, for a load/store of the specified type.
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bool isLegalAddressingMode(const DataLayout &DL, const AddrMode &AM, Type *Ty,
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unsigned AS) const override;
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/// \brief Return the cost of the scaling factor used in the addressing
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/// mode represented by AM for this target, for a load/store
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/// of the specified type.
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/// If the AM is supported, the return value must be >= 0.
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/// If the AM is not supported, it returns a negative value.
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int getScalingFactorCost(const DataLayout &DL, const AddrMode &AM, Type *Ty,
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unsigned AS) const override;
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/// isFMAFasterThanFMulAndFAdd - Return true if an FMA operation is faster
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/// than a pair of fmul and fadd instructions. fmuladd intrinsics will be
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/// expanded to FMAs when this method returns true, otherwise fmuladd is
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/// expanded to fmul + fadd.
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bool isFMAFasterThanFMulAndFAdd(EVT VT) const override;
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const MCPhysReg *getScratchRegisters(CallingConv::ID CC) const override;
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/// \brief Returns false if N is a bit extraction pattern of (X >> C) & Mask.
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bool isDesirableToCommuteWithShift(const SDNode *N) const override;
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/// \brief Returns true if it is beneficial to convert a load of a constant
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/// to just the constant itself.
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bool shouldConvertConstantLoadToIntImm(const APInt &Imm,
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Type *Ty) const override;
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bool hasLoadLinkedStoreConditional() const override;
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Value *emitLoadLinked(IRBuilder<> &Builder, Value *Addr,
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AtomicOrdering Ord) const override;
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Value *emitStoreConditional(IRBuilder<> &Builder, Value *Val,
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Value *Addr, AtomicOrdering Ord) const override;
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bool shouldExpandAtomicLoadInIR(LoadInst *LI) const override;
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bool shouldExpandAtomicStoreInIR(StoreInst *SI) const override;
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TargetLoweringBase::AtomicRMWExpansionKind
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shouldExpandAtomicRMWInIR(AtomicRMWInst *AI) const override;
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bool useLoadStackGuardNode() const override;
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TargetLoweringBase::LegalizeTypeAction
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getPreferredVectorAction(EVT VT) const override;
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private:
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bool isExtFreeImpl(const Instruction *Ext) const override;
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/// Subtarget - Keep a pointer to the AArch64Subtarget around so that we can
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/// make the right decision when generating code for different targets.
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const AArch64Subtarget *Subtarget;
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void addTypeForNEON(EVT VT, EVT PromotedBitwiseVT);
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void addDRTypeForNEON(MVT VT);
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void addQRTypeForNEON(MVT VT);
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SDValue
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LowerFormalArguments(SDValue Chain, CallingConv::ID CallConv, bool isVarArg,
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const SmallVectorImpl<ISD::InputArg> &Ins, SDLoc DL,
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SelectionDAG &DAG,
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SmallVectorImpl<SDValue> &InVals) const override;
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SDValue LowerCall(CallLoweringInfo & /*CLI*/,
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SmallVectorImpl<SDValue> &InVals) const override;
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SDValue LowerCallResult(SDValue Chain, SDValue InFlag,
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CallingConv::ID CallConv, bool isVarArg,
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const SmallVectorImpl<ISD::InputArg> &Ins, SDLoc DL,
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SelectionDAG &DAG, SmallVectorImpl<SDValue> &InVals,
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bool isThisReturn, SDValue ThisVal) const;
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bool isEligibleForTailCallOptimization(
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SDValue Callee, CallingConv::ID CalleeCC, bool isVarArg,
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bool isCalleeStructRet, bool isCallerStructRet,
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const SmallVectorImpl<ISD::OutputArg> &Outs,
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const SmallVectorImpl<SDValue> &OutVals,
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const SmallVectorImpl<ISD::InputArg> &Ins, SelectionDAG &DAG) const;
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/// Finds the incoming stack arguments which overlap the given fixed stack
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/// object and incorporates their load into the current chain. This prevents
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/// an upcoming store from clobbering the stack argument before it's used.
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SDValue addTokenForArgument(SDValue Chain, SelectionDAG &DAG,
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MachineFrameInfo *MFI, int ClobberedFI) const;
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bool DoesCalleeRestoreStack(CallingConv::ID CallCC, bool TailCallOpt) const;
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bool IsTailCallConvention(CallingConv::ID CallCC) const;
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void saveVarArgRegisters(CCState &CCInfo, SelectionDAG &DAG, SDLoc DL,
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SDValue &Chain) const;
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bool CanLowerReturn(CallingConv::ID CallConv, MachineFunction &MF,
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bool isVarArg,
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const SmallVectorImpl<ISD::OutputArg> &Outs,
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LLVMContext &Context) const override;
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SDValue LowerReturn(SDValue Chain, CallingConv::ID CallConv, bool isVarArg,
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const SmallVectorImpl<ISD::OutputArg> &Outs,
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const SmallVectorImpl<SDValue> &OutVals, SDLoc DL,
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SelectionDAG &DAG) const override;
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SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerDarwinGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerELFGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerELFTLSDescCallSeq(SDValue SymAddr, SDLoc DL,
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SelectionDAG &DAG) const;
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SDValue LowerSETCC(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerBR_CC(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerSELECT(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerSELECT_CC(ISD::CondCode CC, SDValue LHS, SDValue RHS,
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SDValue TVal, SDValue FVal, SDLoc dl,
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SelectionDAG &DAG) const;
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SDValue LowerJumpTable(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerConstantPool(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerBlockAddress(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerAAPCS_VASTART(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerDarwin_VASTART(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerVASTART(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerVACOPY(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerVAARG(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerRETURNADDR(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerINSERT_VECTOR_ELT(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerEXTRACT_VECTOR_ELT(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerSCALAR_TO_VECTOR(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerBUILD_VECTOR(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerVECTOR_SHUFFLE(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerEXTRACT_SUBVECTOR(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerVectorSRA_SRL_SHL(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerShiftLeftParts(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerShiftRightParts(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerVSETCC(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerCTPOP(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerF128Call(SDValue Op, SelectionDAG &DAG,
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RTLIB::Libcall Call) const;
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SDValue LowerFCOPYSIGN(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerFP_EXTEND(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerFP_ROUND(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerFP_TO_INT(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerINT_TO_FP(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerVectorAND(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerVectorOR(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerCONCAT_VECTORS(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerFSINCOS(SDValue Op, SelectionDAG &DAG) const;
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SDValue BuildSDIVPow2(SDNode *N, const APInt &Divisor, SelectionDAG &DAG,
|
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std::vector<SDNode *> *Created) const override;
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bool combineRepeatedFPDivisors(unsigned NumUsers) const override;
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ConstraintType getConstraintType(StringRef Constraint) const override;
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unsigned getRegisterByName(const char* RegName, EVT VT,
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SelectionDAG &DAG) const override;
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|
/// Examine constraint string and operand type and determine a weight value.
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/// The operand object must already have been set up with the operand type.
|
|
ConstraintWeight
|
|
getSingleConstraintMatchWeight(AsmOperandInfo &info,
|
|
const char *constraint) const override;
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|
std::pair<unsigned, const TargetRegisterClass *>
|
|
getRegForInlineAsmConstraint(const TargetRegisterInfo *TRI,
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|
StringRef Constraint, MVT VT) const override;
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|
void LowerAsmOperandForConstraint(SDValue Op, std::string &Constraint,
|
|
std::vector<SDValue> &Ops,
|
|
SelectionDAG &DAG) const override;
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|
|
|
unsigned getInlineAsmMemConstraint(StringRef ConstraintCode) const override {
|
|
if (ConstraintCode == "Q")
|
|
return InlineAsm::Constraint_Q;
|
|
// FIXME: clang has code for 'Ump', 'Utf', 'Usa', and 'Ush' but these are
|
|
// followed by llvm_unreachable so we'll leave them unimplemented in
|
|
// the backend for now.
|
|
return TargetLowering::getInlineAsmMemConstraint(ConstraintCode);
|
|
}
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|
|
|
bool isUsedByReturnOnly(SDNode *N, SDValue &Chain) const override;
|
|
bool mayBeEmittedAsTailCall(CallInst *CI) const override;
|
|
bool getIndexedAddressParts(SDNode *Op, SDValue &Base, SDValue &Offset,
|
|
ISD::MemIndexedMode &AM, bool &IsInc,
|
|
SelectionDAG &DAG) const;
|
|
bool getPreIndexedAddressParts(SDNode *N, SDValue &Base, SDValue &Offset,
|
|
ISD::MemIndexedMode &AM,
|
|
SelectionDAG &DAG) const override;
|
|
bool getPostIndexedAddressParts(SDNode *N, SDNode *Op, SDValue &Base,
|
|
SDValue &Offset, ISD::MemIndexedMode &AM,
|
|
SelectionDAG &DAG) const override;
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|
|
|
void ReplaceNodeResults(SDNode *N, SmallVectorImpl<SDValue> &Results,
|
|
SelectionDAG &DAG) const override;
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|
|
|
bool functionArgumentNeedsConsecutiveRegisters(Type *Ty,
|
|
CallingConv::ID CallConv,
|
|
bool isVarArg) const override;
|
|
|
|
bool shouldNormalizeToSelectSequence(LLVMContext &, EVT) const override;
|
|
};
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|
|
|
namespace AArch64 {
|
|
FastISel *createFastISel(FunctionLoweringInfo &funcInfo,
|
|
const TargetLibraryInfo *libInfo);
|
|
} // end namespace AArch64
|
|
|
|
} // end namespace llvm
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#endif
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