1 files changed, 18 insertions, 8 deletions
diff --git a/include/llvm/Support/ConstantRange.h b/include/llvm/Support/ConstantRange.h
index f50e979..806dc80 100644
--- a/include/llvm/Support/ConstantRange.h
+++ b/include/llvm/Support/ConstantRange.h
@@ -12,13 +12,19 @@
 // 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
@@ -51,9 +57,11 @@ class ConstantRange {
   ///
   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...
   ///
@@ -79,11 +87,13 @@ class ConstantRange {
   /// 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.
@@ -117,7 +127,7 @@ class ConstantRange {
   /// 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
@@ -125,7 +135,7 @@ class ConstantRange {
   /// [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