// 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
///
ConstantRange(Constant *Lower, Constant *Upper);
- /// Initialize a set of values that all satisfy the condition with C.
- ///
- ConstantRange(unsigned SetCCOpcode, ConstantIntegral *C);
+ /// Initialize a set of values that all satisfy the predicate with C. The
+ /// predicate should be either an ICmpInst::Predicate or FCmpInst::Predicate
+ /// value.
+ /// @brief Get a range for a relation with a constant integral.
+ ConstantRange(unsigned short predicate, ConstantIntegral *C);
/// getLower - Return the lower value for this range...
///
/// isWrappedSet - Return true if this set wraps around the top of the range,
/// for example: [100, 8)
///
- bool isWrappedSet() const;
+ bool isWrappedSet(bool isSigned) const;
/// contains - Return true if the specified value is in the set.
+ /// The isSigned parameter indicates whether the comparisons should be
+ /// performed as if the values are signed or not.
///
- bool contains(ConstantInt *Val) const;
+ bool contains(ConstantInt *Val, bool isSigned) const;
/// getSingleElement - If this set contains a single element, return it,
/// otherwise return null.
/// one of the sets but not the other. For example: [100, 8) intersect [3,
/// 120) yields [3, 120)
///
- ConstantRange intersectWith(const ConstantRange &CR) const;
+ ConstantRange intersectWith(const ConstantRange &CR, bool isSigned) 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
/// [3, 15), which includes 9, 10, and 11, which were not included in either
/// set before.
///
- ConstantRange unionWith(const ConstantRange &CR) const;
+ ConstantRange unionWith(const ConstantRange &CR, bool isSigned) const;
/// zeroExtend - Return a new range in the specified integer type, which must
/// be strictly larger than the current type. The returned range will