// constant, which MAY wrap around the end of the numeric range. To do this, it
// keeps track of a [lower, upper) bound, which specifies an interval just like
// STL iterators. When used with boolean values, the following are important
-// ranges (other integral ranges use min/max values for special range values):
+// ranges: :
//
// [F, F) = {} = Empty set
// [T, F) = {T}
// [F, T) = {F}
// [T, T) = {F, T} = Full set
//
+// The other integral ranges use min/max values for special range values. For
+// example, for 8-bit types, it uses:
+// [0, 0) = {} = Empty set
+// [255, 255) = {0..255} = Full Set
+//
+// Note that ConstantRange always keeps unsigned values.
//===----------------------------------------------------------------------===//
#ifndef LLVM_SUPPORT_CONSTANT_RANGE_H
#define LLVM_SUPPORT_CONSTANT_RANGE_H
+#include "llvm/ADT/APInt.h"
#include "llvm/Support/DataTypes.h"
#include "llvm/Support/Streams.h"
#include <iosfwd>
namespace llvm {
-class Constant;
-class ConstantIntegral;
-class ConstantInt;
-class Type;
class ConstantRange {
- ConstantIntegral *Lower, *Upper;
+ APInt Lower, Upper;
+ static ConstantRange intersect1Wrapped(const ConstantRange &LHS,
+ const ConstantRange &RHS);
public:
- /// Initialize a full (the default) or empty set for the specified type.
+ /// Initialize a full (the default) or empty set for the specified bit width.
///
- ConstantRange(const Type *Ty, bool isFullSet = true);
+ ConstantRange(uint32_t BitWidth, bool isFullSet = true);
/// Initialize a range to hold the single specified value.
///
- ConstantRange(Constant *Value);
+ ConstantRange(const APInt &Value);
- /// Initialize a range of values explicitly... this will assert out if
- /// Lower==Upper and Lower != Min or Max for its type, if the two constants
- /// have different types, or if the constant are not integral values.
- ///
- ConstantRange(Constant *Lower, Constant *Upper);
-
- /// Initialize a set of values that all satisfy the condition with C.
- ///
- ConstantRange(unsigned SetCCOpcode, ConstantIntegral *C);
+ /// @brief Initialize a range of values explicitly. This will assert out if
+ /// Lower==Upper and Lower != Min or Max value for its type. It will also
+ /// assert out if the two APInt's are not the same bit width.
+ ConstantRange(const APInt& Lower, const APInt& Upper);
/// getLower - Return the lower value for this range...
///
- ConstantIntegral *getLower() const { return Lower; }
+ const APInt &getLower() const { return Lower; }
/// getUpper - Return the upper value for this range...
///
- ConstantIntegral *getUpper() const { return Upper; }
+ const APInt &getUpper() const { return Upper; }
- /// getType - Return the LLVM data type of this range.
+ /// getBitWidth - get the bit width of this ConstantRange
///
- const Type *getType() const;
+ uint32_t getBitWidth() const { return Lower.getBitWidth(); }
/// isFullSet - Return true if this set contains all of the elements possible
/// for this data-type
/// contains - Return true if the specified value is in the set.
///
- bool contains(ConstantInt *Val) const;
+ bool contains(const APInt &Val) const;
/// getSingleElement - If this set contains a single element, return it,
/// otherwise return null.
///
- ConstantIntegral *getSingleElement() const;
+ const APInt *getSingleElement() const {
+ if (Upper == Lower + 1)
+ return &Lower;
+ return 0;
+ }
/// isSingleElement - Return true if this set contains exactly one member.
///
/// getSetSize - Return the number of elements in this set.
///
- uint64_t getSetSize() const;
+ APInt getSetSize() const;
+
+ /// getUnsignedMax - Return the largest unsigned value contained in the
+ /// ConstantRange.
+ ///
+ APInt getUnsignedMax() const;
+
+ /// getUnsignedMin - Return the smallest unsigned value contained in the
+ /// ConstantRange.
+ ///
+ APInt getUnsignedMin() const;
+
+ /// getSignedMax - Return the largest signed value contained in the
+ /// ConstantRange.
+ ///
+ APInt getSignedMax() const;
+
+ /// getSignedMin - Return the smallest signed value contained in the
+ /// ConstantRange.
+ ///
+ APInt getSignedMin() const;
/// operator== - Return true if this range is equal to another range.
///
/// subtract - Subtract the specified constant from the endpoints of this
/// constant range.
- ConstantRange subtract(ConstantInt *CI) const;
+ ConstantRange subtract(const APInt &CI) const;
- /// intersect - Return the range that results from the intersection of this
- /// range with another range. The resultant range is pruned as much as
+ /// intersectWith - Return the range that results from the intersection of
+ /// this range with another range. The resultant range is pruned as much as
/// possible, but there may be cases where elements are included that are in
/// one of the sets but not the other. For example: [100, 8) intersect [3,
/// 120) yields [3, 120)
///
ConstantRange intersectWith(const ConstantRange &CR) const;
- /// union - Return the range that results from the union of this range with
- /// another range. The resultant range is guaranteed to include the elements
- /// of both sets, but may contain more. For example, [3, 9) union [12,15) is
- /// [3, 15), which includes 9, 10, and 11, which were not included in either
- /// set before.
+ /// maximalIntersectWith - Return the range that results from the intersection
+ /// of this range with another range. The resultant range is guaranteed to
+ /// include all elements contained in both input ranges, and to have the
+ /// smallest possible set size that does so. Because there may be two
+ /// intersections with the same set size, A.maximalIntersectWith(B) might not
+ /// be equal to B.maximalIntersectWith(A).
+ ///
+ ConstantRange maximalIntersectWith(const ConstantRange &CR) const;
+
+ /// unionWith - Return the range that results from the union of this range
+ /// with another range. The resultant range is guaranteed to include the
+ /// elements of both sets, but may contain more. For example, [3, 9) union
+ /// [12,15) is [3, 15), which includes 9, 10, and 11, which were not included
+ /// in either set before.
///
ConstantRange unionWith(const ConstantRange &CR) const;
/// zeroExtend - Return a new range in the specified integer type, which must
/// be strictly larger than the current type. The returned range will
/// correspond to the possible range of values if the source range had been
- /// zero extended.
- ConstantRange zeroExtend(const Type *Ty) const;
+ /// zero extended to BitWidth.
+ ConstantRange zeroExtend(uint32_t BitWidth) const;
+
+ /// signExtend - Return a new range in the specified integer type, which must
+ /// be strictly larger than the current type. The returned range will
+ /// correspond to the possible range of values if the source range had been
+ /// sign extended to BitWidth.
+ ConstantRange signExtend(uint32_t BitWidth) const;
/// truncate - Return a new range in the specified integer type, which must be
/// strictly smaller than the current type. The returned range will
/// correspond to the possible range of values if the source range had been
/// truncated to the specified type.
- ConstantRange truncate(const Type *Ty) const;
+ ConstantRange truncate(uint32_t BitWidth) const;
/// print - Print out the bounds to a stream...
///