LCOV - code coverage report
Current view: top level - include/llvm/Support - LowLevelTypeImpl.h (source / functions) Hit Total Coverage
Test: llvm-toolchain.info Lines: 47 47 100.0 %
Date: 2018-06-17 00:07:59 Functions: 4 4 100.0 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : //== llvm/Support/LowLevelTypeImpl.h --------------------------- -*- C++ -*-==//
       2             : //
       3             : //                     The LLVM Compiler Infrastructure
       4             : //
       5             : // This file is distributed under the University of Illinois Open Source
       6             : // License. See LICENSE.TXT for details.
       7             : //
       8             : //===----------------------------------------------------------------------===//
       9             : //
      10             : /// Implement a low-level type suitable for MachineInstr level instruction
      11             : /// selection.
      12             : ///
      13             : /// For a type attached to a MachineInstr, we only care about 2 details: total
      14             : /// size and the number of vector lanes (if any). Accordingly, there are 4
      15             : /// possible valid type-kinds:
      16             : ///
      17             : ///    * `sN` for scalars and aggregates
      18             : ///    * `<N x sM>` for vectors, which must have at least 2 elements.
      19             : ///    * `pN` for pointers
      20             : ///
      21             : /// Other information required for correct selection is expected to be carried
      22             : /// by the opcode, or non-type flags. For example the distinction between G_ADD
      23             : /// and G_FADD for int/float or fast-math flags.
      24             : //
      25             : //===----------------------------------------------------------------------===//
      26             : 
      27             : #ifndef LLVM_SUPPORT_LOWLEVELTYPEIMPL_H
      28             : #define LLVM_SUPPORT_LOWLEVELTYPEIMPL_H
      29             : 
      30             : #include "llvm/ADT/DenseMapInfo.h"
      31             : #include "llvm/Support/MachineValueType.h"
      32             : #include <cassert>
      33             : 
      34             : namespace llvm {
      35             : 
      36             : class DataLayout;
      37             : class Type;
      38             : class raw_ostream;
      39             : 
      40             : class LLT {
      41             : public:
      42             :   /// Get a low-level scalar or aggregate "bag of bits".
      43             :   static LLT scalar(unsigned SizeInBits) {
      44             :     assert(SizeInBits > 0 && "invalid scalar size");
      45             :     return LLT{/*isPointer=*/false, /*isVector=*/false, /*NumElements=*/0,
      46             :                SizeInBits, /*AddressSpace=*/0};
      47             :   }
      48             : 
      49             :   /// Get a low-level pointer in the given address space (defaulting to 0).
      50             :   static LLT pointer(uint16_t AddressSpace, unsigned SizeInBits) {
      51             :     assert(SizeInBits > 0 && "invalid pointer size");
      52             :     return LLT{/*isPointer=*/true, /*isVector=*/false, /*NumElements=*/0,
      53             :                SizeInBits, AddressSpace};
      54             :   }
      55             : 
      56             :   /// Get a low-level vector of some number of elements and element width.
      57             :   /// \p NumElements must be at least 2.
      58             :   static LLT vector(uint16_t NumElements, unsigned ScalarSizeInBits) {
      59             :     assert(NumElements > 1 && "invalid number of vector elements");
      60             :     assert(ScalarSizeInBits > 0 && "invalid vector element size");
      61             :     return LLT{/*isPointer=*/false, /*isVector=*/true, NumElements,
      62             :                ScalarSizeInBits, /*AddressSpace=*/0};
      63             :   }
      64             : 
      65             :   /// Get a low-level vector of some number of elements and element type.
      66        2601 :   static LLT vector(uint16_t NumElements, LLT ScalarTy) {
      67             :     assert(NumElements > 1 && "invalid number of vector elements");
      68             :     assert(!ScalarTy.isVector() && "invalid vector element type");
      69        2601 :     return LLT{ScalarTy.isPointer(), /*isVector=*/true, NumElements,
      70             :                ScalarTy.getSizeInBits(),
      71        2601 :                ScalarTy.isPointer() ? ScalarTy.getAddressSpace() : 0};
      72             :   }
      73             : 
      74             :   explicit LLT(bool isPointer, bool isVector, uint16_t NumElements,
      75             :                unsigned SizeInBits, unsigned AddressSpace) {
      76             :     init(isPointer, isVector, NumElements, SizeInBits, AddressSpace);
      77             :   }
      78      258812 :   explicit LLT() : IsPointer(false), IsVector(false), RawData(0) {}
      79             : 
      80             :   explicit LLT(MVT VT);
      81             : 
      82    20082270 :   bool isValid() const { return RawData != 0; }
      83             : 
      84     3780245 :   bool isScalar() const { return isValid() && !IsPointer && !IsVector; }
      85             : 
      86     6346354 :   bool isPointer() const { return isValid() && IsPointer && !IsVector; }
      87             : 
      88     4648411 :   bool isVector() const { return isValid() && IsVector; }
      89             : 
      90             :   /// Returns the number of elements in a vector LLT. Must only be called on
      91             :   /// vector types.
      92             :   uint16_t getNumElements() const {
      93             :     assert(IsVector && "cannot get number of elements on scalar/aggregate");
      94     1279710 :     if (!IsPointer)
      95     1279695 :       return getFieldValue(VectorElementsFieldInfo);
      96             :     else
      97          15 :       return getFieldValue(PointerVectorElementsFieldInfo);
      98             :   }
      99             : 
     100             :   /// Returns the total size of the type. Must only be called on sized types.
     101     3500614 :   unsigned getSizeInBits() const {
     102             :     if (isPointer() || isScalar())
     103             :       return getScalarSizeInBits();
     104      870314 :     return getScalarSizeInBits() * getNumElements();
     105             :   }
     106             : 
     107             :   unsigned getScalarSizeInBits() const {
     108             :     assert(RawData != 0 && "Invalid Type");
     109     1532216 :     if (!IsVector) {
     110     2642883 :       if (!IsPointer)
     111     2482897 :         return getFieldValue(ScalarSizeFieldInfo);
     112             :       else
     113      159986 :         return getFieldValue(PointerSizeFieldInfo);
     114             :     } else {
     115      879957 :       if (!IsPointer)
     116     1519606 :         return getFieldValue(VectorSizeFieldInfo);
     117             :       else
     118          27 :         return getFieldValue(PointerVectorSizeFieldInfo);
     119             :     }
     120             :   }
     121             : 
     122             :   unsigned getAddressSpace() const {
     123             :     assert(RawData != 0 && "Invalid Type");
     124             :     assert(IsPointer && "cannot get address space of non-pointer type");
     125      146087 :     if (!IsVector)
     126      146067 :       return getFieldValue(PointerAddressSpaceFieldInfo);
     127             :     else
     128          20 :       return getFieldValue(PointerVectorAddressSpaceFieldInfo);
     129             :   }
     130             : 
     131             :   /// Returns the vector's element type. Only valid for vector types.
     132      639676 :   LLT getElementType() const {
     133             :     assert(isVector() && "cannot get element type of scalar/aggregate");
     134      639676 :     if (IsPointer)
     135          20 :       return pointer(getAddressSpace(), getScalarSizeInBits());
     136             :     else
     137             :       return scalar(getScalarSizeInBits());
     138             :   }
     139             : 
     140             :   void print(raw_ostream &OS) const;
     141             : 
     142             :   bool operator==(const LLT &RHS) const {
     143    85101426 :     return IsPointer == RHS.IsPointer && IsVector == RHS.IsVector &&
     144    39116388 :            RHS.RawData == RawData;
     145             :   }
     146             : 
     147             :   bool operator!=(const LLT &RHS) const { return !(*this == RHS); }
     148             : 
     149             :   friend struct DenseMapInfo<LLT>;
     150             : 
     151             : private:
     152             :   /// LLT is packed into 64 bits as follows:
     153             :   /// isPointer : 1
     154             :   /// isVector  : 1
     155             :   /// with 62 bits remaining for Kind-specific data, packed in bitfields
     156             :   /// as described below. As there isn't a simple portable way to pack bits
     157             :   /// into bitfields, here the different fields in the packed structure is
     158             :   /// described in static const *Field variables. Each of these variables
     159             :   /// is a 2-element array, with the first element describing the bitfield size
     160             :   /// and the second element describing the bitfield offset.
     161             :   typedef int BitFieldInfo[2];
     162             :   ///
     163             :   /// This is how the bitfields are packed per Kind:
     164             :   /// * Invalid:
     165             :   ///   gets encoded as RawData == 0, as that is an invalid encoding, since for
     166             :   ///   valid encodings, SizeInBits/SizeOfElement must be larger than 0.
     167             :   /// * Non-pointer scalar (isPointer == 0 && isVector == 0):
     168             :   ///   SizeInBits: 32;
     169             :   static const constexpr BitFieldInfo ScalarSizeFieldInfo{32, 0};
     170             :   /// * Pointer (isPointer == 1 && isVector == 0):
     171             :   ///   SizeInBits: 16;
     172             :   ///   AddressSpace: 23;
     173             :   static const constexpr BitFieldInfo PointerSizeFieldInfo{16, 0};
     174             :   static const constexpr BitFieldInfo PointerAddressSpaceFieldInfo{
     175             :       23, PointerSizeFieldInfo[0] + PointerSizeFieldInfo[1]};
     176             :   /// * Vector-of-non-pointer (isPointer == 0 && isVector == 1):
     177             :   ///   NumElements: 16;
     178             :   ///   SizeOfElement: 32;
     179             :   static const constexpr BitFieldInfo VectorElementsFieldInfo{16, 0};
     180             :   static const constexpr BitFieldInfo VectorSizeFieldInfo{
     181             :       32, VectorElementsFieldInfo[0] + VectorElementsFieldInfo[1]};
     182             :   /// * Vector-of-pointer (isPointer == 1 && isVector == 1):
     183             :   ///   NumElements: 16;
     184             :   ///   SizeOfElement: 16;
     185             :   ///   AddressSpace: 23;
     186             :   static const constexpr BitFieldInfo PointerVectorElementsFieldInfo{16, 0};
     187             :   static const constexpr BitFieldInfo PointerVectorSizeFieldInfo{
     188             :       16,
     189             :       PointerVectorElementsFieldInfo[1] + PointerVectorElementsFieldInfo[0]};
     190             :   static const constexpr BitFieldInfo PointerVectorAddressSpaceFieldInfo{
     191             :       23, PointerVectorSizeFieldInfo[1] + PointerVectorSizeFieldInfo[0]};
     192             : 
     193             :   uint64_t IsPointer : 1;
     194             :   uint64_t IsVector : 1;
     195             :   uint64_t RawData : 62;
     196             : 
     197             :   static uint64_t getMask(const BitFieldInfo FieldInfo) {
     198             :     const int FieldSizeInBits = FieldInfo[0];
     199             :     return (((uint64_t)1) << FieldSizeInBits) - 1;
     200             :   }
     201             :   static uint64_t maskAndShift(uint64_t Val, uint64_t Mask, uint8_t Shift) {
     202             :     assert(Val <= Mask && "Value too large for field");
     203       62553 :     return (Val & Mask) << Shift;
     204             :   }
     205             :   static uint64_t maskAndShift(uint64_t Val, const BitFieldInfo FieldInfo) {
     206             :     return maskAndShift(Val, getMask(FieldInfo), FieldInfo[1]);
     207             :   }
     208             :   uint64_t getFieldValue(const BitFieldInfo FieldInfo) const {
     209     5587877 :     return getMask(FieldInfo) & (RawData >> FieldInfo[1]);
     210             :   }
     211             : 
     212             :   void init(bool IsPointer, bool IsVector, uint16_t NumElements,
     213             :             unsigned SizeInBits, unsigned AddressSpace) {
     214        1773 :     this->IsPointer = IsPointer;
     215        1773 :     this->IsVector = IsVector;
     216         135 :     if (!IsVector) {
     217             :       if (!IsPointer)
     218      730053 :         RawData = maskAndShift(SizeInBits, ScalarSizeFieldInfo);
     219             :       else
     220       35854 :         RawData = maskAndShift(SizeInBits, PointerSizeFieldInfo) |
     221        6273 :                   maskAndShift(AddressSpace, PointerAddressSpaceFieldInfo);
     222             :     } else {
     223             :       assert(NumElements > 1 && "invalid number of vector elements");
     224        2601 :       if (!IsPointer)
     225      110530 :         RawData = maskAndShift(NumElements, VectorElementsFieldInfo) |
     226       55265 :                   maskAndShift(SizeInBits, VectorSizeFieldInfo);
     227             :       else
     228             :         RawData =
     229          32 :             maskAndShift(NumElements, PointerVectorElementsFieldInfo) |
     230          32 :             maskAndShift(SizeInBits, PointerVectorSizeFieldInfo) |
     231          16 :             maskAndShift(AddressSpace, PointerVectorAddressSpaceFieldInfo);
     232             :     }
     233             :   }
     234             : };
     235             : 
     236         950 : inline raw_ostream& operator<<(raw_ostream &OS, const LLT &Ty) {
     237       15491 :   Ty.print(OS);
     238         950 :   return OS;
     239             : }
     240             : 
     241             : template<> struct DenseMapInfo<LLT> {
     242             :   static inline LLT getEmptyKey() {
     243             :     LLT Invalid;
     244             :     Invalid.IsPointer = true;
     245             :     return Invalid;
     246             :   }
     247             :   static inline LLT getTombstoneKey() {
     248             :     LLT Invalid;
     249             :     Invalid.IsVector = true;
     250             :     return Invalid;
     251             :   }
     252             :   static inline unsigned getHashValue(const LLT &Ty) {
     253     5145824 :     uint64_t Val = ((uint64_t)Ty.RawData) << 2 | ((uint64_t)Ty.IsPointer) << 1 |
     254     2572912 :                    ((uint64_t)Ty.IsVector);
     255             :     return DenseMapInfo<uint64_t>::getHashValue(Val);
     256             :   }
     257             :   static bool isEqual(const LLT &LHS, const LLT &RHS) {
     258             :     return LHS == RHS;
     259             :   }
     260             : };
     261             : 
     262             : }
     263             : 
     264             : #endif // LLVM_SUPPORT_LOWLEVELTYPEIMPL_H

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