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      1 //===- CodeGen/ValueTypes.h - Low-Level Target independ. types --*- 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 // This file defines the set of low-level target independent types which various
     11 // values in the code generator are.  This allows the target specific behavior
     12 // of instructions to be described to target independent passes.
     13 //
     14 //===----------------------------------------------------------------------===//
     15 
     16 #ifndef LLVM_CODEGEN_VALUETYPES_H
     17 #define LLVM_CODEGEN_VALUETYPES_H
     18 
     19 #include "llvm/Support/DataTypes.h"
     20 #include "llvm/Support/ErrorHandling.h"
     21 #include "llvm/Support/MathExtras.h"
     22 #include <cassert>
     23 #include <string>
     24 
     25 namespace llvm {
     26   class Type;
     27   class LLVMContext;
     28   struct EVT;
     29 
     30   /// MVT - Machine Value Type.  Every type that is supported natively by some
     31   /// processor targeted by LLVM occurs here.  This means that any legal value
     32   /// type can be represented by a MVT.
     33   class MVT {
     34   public:
     35     enum SimpleValueType {
     36       // If you change this numbering, you must change the values in
     37       // ValueTypes.td as well!
     38       Other          =   0,   // This is a non-standard value
     39       i1             =   1,   // This is a 1 bit integer value
     40       i8             =   2,   // This is an 8 bit integer value
     41       i16            =   3,   // This is a 16 bit integer value
     42       i32            =   4,   // This is a 32 bit integer value
     43       i64            =   5,   // This is a 64 bit integer value
     44       i128           =   6,   // This is a 128 bit integer value
     45 
     46       FIRST_INTEGER_VALUETYPE = i1,
     47       LAST_INTEGER_VALUETYPE  = i128,
     48 
     49       f16            =   7,   // This is a 16 bit floating point value
     50       f32            =   8,   // This is a 32 bit floating point value
     51       f64            =   9,   // This is a 64 bit floating point value
     52       f80            =  10,   // This is a 80 bit floating point value
     53       f128           =  11,   // This is a 128 bit floating point value
     54       ppcf128        =  12,   // This is a PPC 128-bit floating point value
     55 
     56       FIRST_FP_VALUETYPE = f16,
     57       LAST_FP_VALUETYPE  = ppcf128,
     58 
     59       v2i8           =  13,   //  2 x i8
     60       v4i8           =  14,   //  4 x i8
     61       v8i8           =  15,   //  8 x i8
     62       v16i8          =  16,   // 16 x i8
     63       v32i8          =  17,   // 32 x i8
     64       v2i16          =  18,   //  2 x i16
     65       v4i16          =  19,   //  4 x i16
     66       v8i16          =  20,   //  8 x i16
     67       v16i16         =  21,   // 16 x i16
     68       v2i32          =  22,   //  2 x i32
     69       v4i32          =  23,   //  4 x i32
     70       v8i32          =  24,   //  8 x i32
     71       v1i64          =  25,   //  1 x i64
     72       v2i64          =  26,   //  2 x i64
     73       v4i64          =  27,   //  4 x i64
     74       v8i64          =  28,   //  8 x i64
     75 
     76       v2f16          =  29,   //  2 x f16
     77       v2f32          =  30,   //  2 x f32
     78       v4f32          =  31,   //  4 x f32
     79       v8f32          =  32,   //  8 x f32
     80       v2f64          =  33,   //  2 x f64
     81       v4f64          =  34,   //  4 x f64
     82 
     83       FIRST_VECTOR_VALUETYPE = v2i8,
     84       LAST_VECTOR_VALUETYPE  = v4f64,
     85       FIRST_FP_VECTOR_VALUETYPE = v2f16,
     86       LAST_FP_VECTOR_VALUETYPE = v4f64,
     87 
     88       x86mmx         =  35,   // This is an X86 MMX value
     89 
     90       Glue           =  36,   // This glues nodes together during pre-RA sched
     91 
     92       isVoid         =  37,   // This has no value
     93 
     94       Untyped        =  38,   // This value takes a register, but has
     95                               // unspecified type.  The register class
     96                               // will be determined by the opcode.
     97 
     98       LAST_VALUETYPE =  39,   // This always remains at the end of the list.
     99 
    100       // This is the current maximum for LAST_VALUETYPE.
    101       // MVT::MAX_ALLOWED_VALUETYPE is used for asserts and to size bit vectors
    102       // This value must be a multiple of 32.
    103       MAX_ALLOWED_VALUETYPE = 64,
    104 
    105       // Metadata - This is MDNode or MDString.
    106       Metadata       = 250,
    107 
    108       // iPTRAny - An int value the size of the pointer of the current
    109       // target to any address space. This must only be used internal to
    110       // tblgen. Other than for overloading, we treat iPTRAny the same as iPTR.
    111       iPTRAny        = 251,
    112 
    113       // vAny - A vector with any length and element size. This is used
    114       // for intrinsics that have overloadings based on vector types.
    115       // This is only for tblgen's consumption!
    116       vAny           = 252,
    117 
    118       // fAny - Any floating-point or vector floating-point value. This is used
    119       // for intrinsics that have overloadings based on floating-point types.
    120       // This is only for tblgen's consumption!
    121       fAny           = 253,
    122 
    123       // iAny - An integer or vector integer value of any bit width. This is
    124       // used for intrinsics that have overloadings based on integer bit widths.
    125       // This is only for tblgen's consumption!
    126       iAny           = 254,
    127 
    128       // iPTR - An int value the size of the pointer of the current
    129       // target.  This should only be used internal to tblgen!
    130       iPTR           = 255,
    131 
    132       // LastSimpleValueType - The greatest valid SimpleValueType value.
    133       LastSimpleValueType = 255,
    134 
    135       // INVALID_SIMPLE_VALUE_TYPE - Simple value types greater than or equal
    136       // to this are considered extended value types.
    137       INVALID_SIMPLE_VALUE_TYPE = LastSimpleValueType + 1
    138     };
    139 
    140     SimpleValueType SimpleTy;
    141 
    142     MVT() : SimpleTy((SimpleValueType)(INVALID_SIMPLE_VALUE_TYPE)) {}
    143     MVT(SimpleValueType SVT) : SimpleTy(SVT) { }
    144 
    145     bool operator>(const MVT& S)  const { return SimpleTy >  S.SimpleTy; }
    146     bool operator<(const MVT& S)  const { return SimpleTy <  S.SimpleTy; }
    147     bool operator==(const MVT& S) const { return SimpleTy == S.SimpleTy; }
    148     bool operator!=(const MVT& S) const { return SimpleTy != S.SimpleTy; }
    149     bool operator>=(const MVT& S) const { return SimpleTy >= S.SimpleTy; }
    150     bool operator<=(const MVT& S) const { return SimpleTy <= S.SimpleTy; }
    151 
    152     /// isFloatingPoint - Return true if this is a FP, or a vector FP type.
    153     bool isFloatingPoint() const {
    154       return ((SimpleTy >= MVT::FIRST_FP_VALUETYPE &&
    155                SimpleTy <= MVT::LAST_FP_VALUETYPE) ||
    156 	      (SimpleTy >= MVT::FIRST_FP_VECTOR_VALUETYPE &&
    157          SimpleTy <= MVT::LAST_FP_VECTOR_VALUETYPE));
    158     }
    159 
    160     /// isInteger - Return true if this is an integer, or a vector integer type.
    161     bool isInteger() const {
    162       return ((SimpleTy >= MVT::FIRST_INTEGER_VALUETYPE &&
    163                SimpleTy <= MVT::LAST_INTEGER_VALUETYPE) ||
    164 	      (SimpleTy >= MVT::v2i8 && SimpleTy <= MVT::v8i64));
    165     }
    166 
    167     /// isVector - Return true if this is a vector value type.
    168     bool isVector() const {
    169       return (SimpleTy >= MVT::FIRST_VECTOR_VALUETYPE &&
    170               SimpleTy <= MVT::LAST_VECTOR_VALUETYPE);
    171     }
    172 
    173     /// isPow2VectorType - Returns true if the given vector is a power of 2.
    174     bool isPow2VectorType() const {
    175       unsigned NElts = getVectorNumElements();
    176       return !(NElts & (NElts - 1));
    177     }
    178 
    179     /// getPow2VectorType - Widens the length of the given vector MVT up to
    180     /// the nearest power of 2 and returns that type.
    181     MVT getPow2VectorType() const {
    182       if (isPow2VectorType())
    183         return *this;
    184 
    185       unsigned NElts = getVectorNumElements();
    186       unsigned Pow2NElts = 1 << Log2_32_Ceil(NElts);
    187       return MVT::getVectorVT(getVectorElementType(), Pow2NElts);
    188     }
    189 
    190     /// getScalarType - If this is a vector type, return the element type,
    191     /// otherwise return this.
    192     MVT getScalarType() const {
    193       return isVector() ? getVectorElementType() : *this;
    194     }
    195 
    196     MVT getVectorElementType() const {
    197       switch (SimpleTy) {
    198       default:
    199         return (MVT::SimpleValueType)(MVT::INVALID_SIMPLE_VALUE_TYPE);
    200       case v2i8 :
    201       case v4i8 :
    202       case v8i8 :
    203       case v16i8:
    204       case v32i8: return i8;
    205       case v2i16:
    206       case v4i16:
    207       case v8i16:
    208       case v16i16: return i16;
    209       case v2i32:
    210       case v4i32:
    211       case v8i32: return i32;
    212       case v1i64:
    213       case v2i64:
    214       case v4i64:
    215       case v8i64: return i64;
    216       case v2f16: return f16;
    217       case v2f32:
    218       case v4f32:
    219       case v8f32: return f32;
    220       case v2f64:
    221       case v4f64: return f64;
    222       }
    223     }
    224 
    225     unsigned getVectorNumElements() const {
    226       switch (SimpleTy) {
    227       default:
    228         return ~0U;
    229       case v32i8: return 32;
    230       case v16i8:
    231       case v16i16: return 16;
    232       case v8i8 :
    233       case v8i16:
    234       case v8i32:
    235       case v8i64:
    236       case v8f32: return 8;
    237       case v4i8:
    238       case v4i16:
    239       case v4i32:
    240       case v4i64:
    241       case v4f32:
    242       case v4f64: return 4;
    243       case v2i8:
    244       case v2i16:
    245       case v2i32:
    246       case v2i64:
    247       case v2f16:
    248       case v2f32:
    249       case v2f64: return 2;
    250       case v1i64: return 1;
    251       }
    252     }
    253 
    254     unsigned getSizeInBits() const {
    255       switch (SimpleTy) {
    256       case iPTR:
    257         llvm_unreachable("Value type size is target-dependent. Ask TLI.");
    258       case iPTRAny:
    259       case iAny:
    260       case fAny:
    261         llvm_unreachable("Value type is overloaded.");
    262       default:
    263         llvm_unreachable("getSizeInBits called on extended MVT.");
    264       case i1  :  return 1;
    265       case i8  :  return 8;
    266       case i16 :
    267       case f16:
    268       case v2i8:  return 16;
    269       case f32 :
    270       case i32 :
    271       case v4i8:
    272       case v2i16:
    273       case v2f16: return 32;
    274       case x86mmx:
    275       case f64 :
    276       case i64 :
    277       case v8i8:
    278       case v4i16:
    279       case v2i32:
    280       case v1i64:
    281       case v2f32: return 64;
    282       case f80 :  return 80;
    283       case f128:
    284       case ppcf128:
    285       case i128:
    286       case v16i8:
    287       case v8i16:
    288       case v4i32:
    289       case v2i64:
    290       case v4f32:
    291       case v2f64: return 128;
    292       case v32i8:
    293       case v16i16:
    294       case v8i32:
    295       case v4i64:
    296       case v8f32:
    297       case v4f64: return 256;
    298       case v8i64: return 512;
    299       }
    300     }
    301 
    302     /// getStoreSize - Return the number of bytes overwritten by a store
    303     /// of the specified value type.
    304     unsigned getStoreSize() const {
    305       return (getSizeInBits() + 7) / 8;
    306     }
    307 
    308     /// getStoreSizeInBits - Return the number of bits overwritten by a store
    309     /// of the specified value type.
    310     unsigned getStoreSizeInBits() const {
    311       return getStoreSize() * 8;
    312     }
    313 
    314     static MVT getFloatingPointVT(unsigned BitWidth) {
    315       switch (BitWidth) {
    316       default:
    317         llvm_unreachable("Bad bit width!");
    318       case 16:
    319         return MVT::f16;
    320       case 32:
    321         return MVT::f32;
    322       case 64:
    323         return MVT::f64;
    324       case 80:
    325         return MVT::f80;
    326       case 128:
    327         return MVT::f128;
    328       }
    329     }
    330 
    331     static MVT getIntegerVT(unsigned BitWidth) {
    332       switch (BitWidth) {
    333       default:
    334         return (MVT::SimpleValueType)(MVT::INVALID_SIMPLE_VALUE_TYPE);
    335       case 1:
    336         return MVT::i1;
    337       case 8:
    338         return MVT::i8;
    339       case 16:
    340         return MVT::i16;
    341       case 32:
    342         return MVT::i32;
    343       case 64:
    344         return MVT::i64;
    345       case 128:
    346         return MVT::i128;
    347       }
    348     }
    349 
    350     static MVT getVectorVT(MVT VT, unsigned NumElements) {
    351       switch (VT.SimpleTy) {
    352       default:
    353         break;
    354       case MVT::i8:
    355         if (NumElements == 2)  return MVT::v2i8;
    356         if (NumElements == 4)  return MVT::v4i8;
    357         if (NumElements == 8)  return MVT::v8i8;
    358         if (NumElements == 16) return MVT::v16i8;
    359         if (NumElements == 32) return MVT::v32i8;
    360         break;
    361       case MVT::i16:
    362         if (NumElements == 2)  return MVT::v2i16;
    363         if (NumElements == 4)  return MVT::v4i16;
    364         if (NumElements == 8)  return MVT::v8i16;
    365         if (NumElements == 16) return MVT::v16i16;
    366         break;
    367       case MVT::i32:
    368         if (NumElements == 2)  return MVT::v2i32;
    369         if (NumElements == 4)  return MVT::v4i32;
    370         if (NumElements == 8)  return MVT::v8i32;
    371         break;
    372       case MVT::i64:
    373         if (NumElements == 1)  return MVT::v1i64;
    374         if (NumElements == 2)  return MVT::v2i64;
    375         if (NumElements == 4)  return MVT::v4i64;
    376         if (NumElements == 8)  return MVT::v8i64;
    377         break;
    378       case MVT::f16:
    379         if (NumElements == 2)  return MVT::v2f16;
    380         break;
    381       case MVT::f32:
    382         if (NumElements == 2)  return MVT::v2f32;
    383         if (NumElements == 4)  return MVT::v4f32;
    384         if (NumElements == 8)  return MVT::v8f32;
    385         break;
    386       case MVT::f64:
    387         if (NumElements == 2)  return MVT::v2f64;
    388         if (NumElements == 4)  return MVT::v4f64;
    389         break;
    390       }
    391       return (MVT::SimpleValueType)(MVT::INVALID_SIMPLE_VALUE_TYPE);
    392     }
    393   };
    394 
    395 
    396   /// EVT - Extended Value Type.  Capable of holding value types which are not
    397   /// native for any processor (such as the i12345 type), as well as the types
    398   /// a MVT can represent.
    399   struct EVT {
    400   private:
    401     MVT V;
    402     Type *LLVMTy;
    403 
    404   public:
    405     EVT() : V((MVT::SimpleValueType)(MVT::INVALID_SIMPLE_VALUE_TYPE)),
    406             LLVMTy(0) {}
    407     EVT(MVT::SimpleValueType SVT) : V(SVT), LLVMTy(0) { }
    408     EVT(MVT S) : V(S), LLVMTy(0) {}
    409 
    410     bool operator==(EVT VT) const {
    411       return !(*this != VT);
    412     }
    413     bool operator!=(EVT VT) const {
    414       if (V.SimpleTy != VT.V.SimpleTy)
    415         return true;
    416       if (V.SimpleTy == MVT::INVALID_SIMPLE_VALUE_TYPE)
    417         return LLVMTy != VT.LLVMTy;
    418       return false;
    419     }
    420 
    421     /// getFloatingPointVT - Returns the EVT that represents a floating point
    422     /// type with the given number of bits.  There are two floating point types
    423     /// with 128 bits - this returns f128 rather than ppcf128.
    424     static EVT getFloatingPointVT(unsigned BitWidth) {
    425       return MVT::getFloatingPointVT(BitWidth);
    426     }
    427 
    428     /// getIntegerVT - Returns the EVT that represents an integer with the given
    429     /// number of bits.
    430     static EVT getIntegerVT(LLVMContext &Context, unsigned BitWidth) {
    431       MVT M = MVT::getIntegerVT(BitWidth);
    432       if (M.SimpleTy != MVT::INVALID_SIMPLE_VALUE_TYPE)
    433         return M;
    434       return getExtendedIntegerVT(Context, BitWidth);
    435     }
    436 
    437     /// getVectorVT - Returns the EVT that represents a vector NumElements in
    438     /// length, where each element is of type VT.
    439     static EVT getVectorVT(LLVMContext &Context, EVT VT, unsigned NumElements) {
    440       MVT M = MVT::getVectorVT(VT.V, NumElements);
    441       if (M.SimpleTy != MVT::INVALID_SIMPLE_VALUE_TYPE)
    442         return M;
    443       return getExtendedVectorVT(Context, VT, NumElements);
    444     }
    445 
    446     /// changeVectorElementTypeToInteger - Return a vector with the same number
    447     /// of elements as this vector, but with the element type converted to an
    448     /// integer type with the same bitwidth.
    449     EVT changeVectorElementTypeToInteger() const {
    450       if (!isSimple())
    451         return changeExtendedVectorElementTypeToInteger();
    452       MVT EltTy = getSimpleVT().getVectorElementType();
    453       unsigned BitWidth = EltTy.getSizeInBits();
    454       MVT IntTy = MVT::getIntegerVT(BitWidth);
    455       MVT VecTy = MVT::getVectorVT(IntTy, getVectorNumElements());
    456       assert(VecTy != MVT::INVALID_SIMPLE_VALUE_TYPE &&
    457              "Simple vector VT not representable by simple integer vector VT!");
    458       return VecTy;
    459     }
    460 
    461     /// isSimple - Test if the given EVT is simple (as opposed to being
    462     /// extended).
    463     bool isSimple() const {
    464       return V.SimpleTy <= MVT::LastSimpleValueType;
    465     }
    466 
    467     /// isExtended - Test if the given EVT is extended (as opposed to
    468     /// being simple).
    469     bool isExtended() const {
    470       return !isSimple();
    471     }
    472 
    473     /// isFloatingPoint - Return true if this is a FP, or a vector FP type.
    474     bool isFloatingPoint() const {
    475       return isSimple() ? V.isFloatingPoint() : isExtendedFloatingPoint();
    476     }
    477 
    478     /// isInteger - Return true if this is an integer, or a vector integer type.
    479     bool isInteger() const {
    480       return isSimple() ? V.isInteger() : isExtendedInteger();
    481     }
    482 
    483     /// isVector - Return true if this is a vector value type.
    484     bool isVector() const {
    485       return isSimple() ? V.isVector() : isExtendedVector();
    486     }
    487 
    488     /// is64BitVector - Return true if this is a 64-bit vector type.
    489     bool is64BitVector() const {
    490       if (!isSimple())
    491         return isExtended64BitVector();
    492 
    493       return (V == MVT::v8i8  || V==MVT::v4i16 || V==MVT::v2i32 ||
    494               V == MVT::v1i64 || V==MVT::v2f32);
    495     }
    496 
    497     /// is128BitVector - Return true if this is a 128-bit vector type.
    498     bool is128BitVector() const {
    499       if (!isSimple())
    500         return isExtended128BitVector();
    501       return (V==MVT::v16i8 || V==MVT::v8i16 || V==MVT::v4i32 ||
    502               V==MVT::v2i64 || V==MVT::v4f32 || V==MVT::v2f64);
    503     }
    504 
    505     /// is256BitVector - Return true if this is a 256-bit vector type.
    506     inline bool is256BitVector() const {
    507       if (!isSimple())
    508         return isExtended256BitVector();
    509       return (V == MVT::v8f32  || V == MVT::v4f64 || V == MVT::v32i8 ||
    510               V == MVT::v16i16 || V == MVT::v8i32 || V == MVT::v4i64);
    511     }
    512 
    513     /// is512BitVector - Return true if this is a 512-bit vector type.
    514     inline bool is512BitVector() const {
    515       return isSimple() ? (V == MVT::v8i64) : isExtended512BitVector();
    516     }
    517 
    518     /// isOverloaded - Return true if this is an overloaded type for TableGen.
    519     bool isOverloaded() const {
    520       return (V==MVT::iAny || V==MVT::fAny || V==MVT::vAny || V==MVT::iPTRAny);
    521     }
    522 
    523     /// isByteSized - Return true if the bit size is a multiple of 8.
    524     bool isByteSized() const {
    525       return (getSizeInBits() & 7) == 0;
    526     }
    527 
    528     /// isRound - Return true if the size is a power-of-two number of bytes.
    529     bool isRound() const {
    530       unsigned BitSize = getSizeInBits();
    531       return BitSize >= 8 && !(BitSize & (BitSize - 1));
    532     }
    533 
    534     /// bitsEq - Return true if this has the same number of bits as VT.
    535     bool bitsEq(EVT VT) const {
    536       if (EVT::operator==(VT)) return true;
    537       return getSizeInBits() == VT.getSizeInBits();
    538     }
    539 
    540     /// bitsGT - Return true if this has more bits than VT.
    541     bool bitsGT(EVT VT) const {
    542       if (EVT::operator==(VT)) return false;
    543       return getSizeInBits() > VT.getSizeInBits();
    544     }
    545 
    546     /// bitsGE - Return true if this has no less bits than VT.
    547     bool bitsGE(EVT VT) const {
    548       if (EVT::operator==(VT)) return true;
    549       return getSizeInBits() >= VT.getSizeInBits();
    550     }
    551 
    552     /// bitsLT - Return true if this has less bits than VT.
    553     bool bitsLT(EVT VT) const {
    554       if (EVT::operator==(VT)) return false;
    555       return getSizeInBits() < VT.getSizeInBits();
    556     }
    557 
    558     /// bitsLE - Return true if this has no more bits than VT.
    559     bool bitsLE(EVT VT) const {
    560       if (EVT::operator==(VT)) return true;
    561       return getSizeInBits() <= VT.getSizeInBits();
    562     }
    563 
    564 
    565     /// getSimpleVT - Return the SimpleValueType held in the specified
    566     /// simple EVT.
    567     MVT getSimpleVT() const {
    568       assert(isSimple() && "Expected a SimpleValueType!");
    569       return V;
    570     }
    571 
    572     /// getScalarType - If this is a vector type, return the element type,
    573     /// otherwise return this.
    574     EVT getScalarType() const {
    575       return isVector() ? getVectorElementType() : *this;
    576     }
    577 
    578     /// getVectorElementType - Given a vector type, return the type of
    579     /// each element.
    580     EVT getVectorElementType() const {
    581       assert(isVector() && "Invalid vector type!");
    582       if (isSimple())
    583         return V.getVectorElementType();
    584       return getExtendedVectorElementType();
    585     }
    586 
    587     /// getVectorNumElements - Given a vector type, return the number of
    588     /// elements it contains.
    589     unsigned getVectorNumElements() const {
    590       assert(isVector() && "Invalid vector type!");
    591       if (isSimple())
    592         return V.getVectorNumElements();
    593       return getExtendedVectorNumElements();
    594     }
    595 
    596     /// getSizeInBits - Return the size of the specified value type in bits.
    597     unsigned getSizeInBits() const {
    598       if (isSimple())
    599         return V.getSizeInBits();
    600       return getExtendedSizeInBits();
    601     }
    602 
    603     /// getStoreSize - Return the number of bytes overwritten by a store
    604     /// of the specified value type.
    605     unsigned getStoreSize() const {
    606       return (getSizeInBits() + 7) / 8;
    607     }
    608 
    609     /// getStoreSizeInBits - Return the number of bits overwritten by a store
    610     /// of the specified value type.
    611     unsigned getStoreSizeInBits() const {
    612       return getStoreSize() * 8;
    613     }
    614 
    615     /// getRoundIntegerType - Rounds the bit-width of the given integer EVT up
    616     /// to the nearest power of two (and at least to eight), and returns the
    617     /// integer EVT with that number of bits.
    618     EVT getRoundIntegerType(LLVMContext &Context) const {
    619       assert(isInteger() && !isVector() && "Invalid integer type!");
    620       unsigned BitWidth = getSizeInBits();
    621       if (BitWidth <= 8)
    622         return EVT(MVT::i8);
    623       return getIntegerVT(Context, 1 << Log2_32_Ceil(BitWidth));
    624     }
    625 
    626     /// getHalfSizedIntegerVT - Finds the smallest simple value type that is
    627     /// greater than or equal to half the width of this EVT. If no simple
    628     /// value type can be found, an extended integer value type of half the
    629     /// size (rounded up) is returned.
    630     EVT getHalfSizedIntegerVT(LLVMContext &Context) const {
    631       assert(isInteger() && !isVector() && "Invalid integer type!");
    632       unsigned EVTSize = getSizeInBits();
    633       for (unsigned IntVT = MVT::FIRST_INTEGER_VALUETYPE;
    634           IntVT <= MVT::LAST_INTEGER_VALUETYPE; ++IntVT) {
    635         EVT HalfVT = EVT((MVT::SimpleValueType)IntVT);
    636         if (HalfVT.getSizeInBits() * 2 >= EVTSize)
    637           return HalfVT;
    638       }
    639       return getIntegerVT(Context, (EVTSize + 1) / 2);
    640     }
    641 
    642     /// isPow2VectorType - Returns true if the given vector is a power of 2.
    643     bool isPow2VectorType() const {
    644       unsigned NElts = getVectorNumElements();
    645       return !(NElts & (NElts - 1));
    646     }
    647 
    648     /// getPow2VectorType - Widens the length of the given vector EVT up to
    649     /// the nearest power of 2 and returns that type.
    650     EVT getPow2VectorType(LLVMContext &Context) const {
    651       if (!isPow2VectorType()) {
    652         unsigned NElts = getVectorNumElements();
    653         unsigned Pow2NElts = 1 <<  Log2_32_Ceil(NElts);
    654         return EVT::getVectorVT(Context, getVectorElementType(), Pow2NElts);
    655       }
    656       else {
    657         return *this;
    658       }
    659     }
    660 
    661     /// getEVTString - This function returns value type as a string,
    662     /// e.g. "i32".
    663     std::string getEVTString() const;
    664 
    665     /// getTypeForEVT - This method returns an LLVM type corresponding to the
    666     /// specified EVT.  For integer types, this returns an unsigned type.  Note
    667     /// that this will abort for types that cannot be represented.
    668     Type *getTypeForEVT(LLVMContext &Context) const;
    669 
    670     /// getEVT - Return the value type corresponding to the specified type.
    671     /// This returns all pointers as iPTR.  If HandleUnknown is true, unknown
    672     /// types are returned as Other, otherwise they are invalid.
    673     static EVT getEVT(Type *Ty, bool HandleUnknown = false);
    674 
    675     intptr_t getRawBits() {
    676       if (isSimple())
    677         return V.SimpleTy;
    678       else
    679         return (intptr_t)(LLVMTy);
    680     }
    681 
    682     /// compareRawBits - A meaningless but well-behaved order, useful for
    683     /// constructing containers.
    684     struct compareRawBits {
    685       bool operator()(EVT L, EVT R) const {
    686         if (L.V.SimpleTy == R.V.SimpleTy)
    687           return L.LLVMTy < R.LLVMTy;
    688         else
    689           return L.V.SimpleTy < R.V.SimpleTy;
    690       }
    691     };
    692 
    693   private:
    694     // Methods for handling the Extended-type case in functions above.
    695     // These are all out-of-line to prevent users of this header file
    696     // from having a dependency on Type.h.
    697     EVT changeExtendedVectorElementTypeToInteger() const;
    698     static EVT getExtendedIntegerVT(LLVMContext &C, unsigned BitWidth);
    699     static EVT getExtendedVectorVT(LLVMContext &C, EVT VT,
    700                                    unsigned NumElements);
    701     bool isExtendedFloatingPoint() const;
    702     bool isExtendedInteger() const;
    703     bool isExtendedVector() const;
    704     bool isExtended64BitVector() const;
    705     bool isExtended128BitVector() const;
    706     bool isExtended256BitVector() const;
    707     bool isExtended512BitVector() const;
    708     EVT getExtendedVectorElementType() const;
    709     unsigned getExtendedVectorNumElements() const;
    710     unsigned getExtendedSizeInBits() const;
    711   };
    712 
    713 } // End llvm namespace
    714 
    715 #endif
    716