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Provide an isPowerOf2ByteWidth method for the IntegerType class. This will

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mostly be used by back ends that wish to distinguish between integer types
that fit evenly within a natural integer type and those that don't.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33328 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Spencer 2007-01-18 02:59:54 +00:00
parent 39e9c09763
commit 7808dcba05
2 changed files with 11 additions and 0 deletions
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6
include/llvm/DerivedTypes.h
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@ -101,6 +101,12 @@ public:
/// @brief Get the number of bits in this IntegerType /// @brief Get the number of bits in this IntegerType
unsigned getBitWidth() const { return getSubclassData(); } unsigned getBitWidth() const { return getSubclassData(); }
/// This method determines if the width of this IntegerType is a power-of-2
/// in terms of 8 bit bytes.
/// @returns true if this is a power-of-2 byte width.
/// @brief Is this a power-of-2 byte-width IntegerType ?
bool isPowerOf2ByteWidth() const;
// Methods for support type inquiry through isa, cast, and dyn_cast: // Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const IntegerType *T) { return true; } static inline bool classof(const IntegerType *T) { return true; }
static inline bool classof(const Type *T) { static inline bool classof(const Type *T) {

5
lib/VMCore/Type.cpp
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@ -975,6 +975,11 @@ const IntegerType *IntegerType::get(unsigned NumBits) {
return ITy; return ITy;
} }
bool IntegerType::isPowerOf2ByteWidth() const {
unsigned BitWidth = getBitWidth();
return (BitWidth > 7 && Log2_32(BitWidth) == Log2_32_Ceil(BitWidth));
}
// FunctionValType - Define a class to hold the key that goes into the TypeMap // FunctionValType - Define a class to hold the key that goes into the TypeMap
// //
namespace llvm { namespace llvm {