Move a method that creates constant ranges relative to another constant range

per icmp predicate out of predsimplify and into ConstantRange.

Add another utility method that determines whether one range is a subset of
another. Combine with the former to determine whether icmp pred range, range
is known to be true or not.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75357 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 77 insertions, 54 deletions

diff --git a/lib/Support/ConstantRange.cpp b/lib/Support/ConstantRange.cpp
index 809a024115..e04272348d 100644
--- a/lib/Support/ConstantRange.cpp
+++ b/lib/Support/ConstantRange.cpp
@@ -23,6 +23,7 @@
 
 #include "llvm/Support/ConstantRange.h"
 #include "llvm/Support/raw_ostream.h"
+#include "llvm/Instructions.h"
 using namespace llvm;
 
 /// Initialize a full (the default) or empty set for the specified type.
@@ -46,6 +47,53 @@ ConstantRange::ConstantRange(const APInt &L, const APInt &U) :
          "Lower == Upper, but they aren't min or max value!");
 }
 
+ConstantRange ConstantRange::makeICmpRegion(unsigned Pred,
+                                            const ConstantRange &CR) {
+  uint32_t W = CR.getBitWidth();
+  switch (Pred) {
+    default: assert(!"Invalid ICmp predicate to makeICmpRegion()");
+    case ICmpInst::ICMP_EQ:
+      return ConstantRange(CR.getLower(), CR.getUpper());
+    case ICmpInst::ICMP_NE:
+      if (CR.isSingleElement())
+        return ConstantRange(CR.getUpper(), CR.getLower());
+      return ConstantRange(W);
+    case ICmpInst::ICMP_ULT:
+      return ConstantRange(APInt::getMinValue(W), CR.getUnsignedMax());
+    case ICmpInst::ICMP_SLT:
+      return ConstantRange(APInt::getSignedMinValue(W), CR.getSignedMax());
+    case ICmpInst::ICMP_ULE: {
+      APInt UMax(CR.getUnsignedMax());
+      if (UMax.isMaxValue())
+        return ConstantRange(W);
+      return ConstantRange(APInt::getMinValue(W), UMax + 1);
+    }
+    case ICmpInst::ICMP_SLE: {
+      APInt SMax(CR.getSignedMax());
+      if (SMax.isMaxSignedValue() || (SMax+1).isMaxSignedValue())
+        return ConstantRange(W);
+      return ConstantRange(APInt::getSignedMinValue(W), SMax + 1);
+    }
+    case ICmpInst::ICMP_UGT:
+      return ConstantRange(CR.getUnsignedMin() + 1, APInt::getNullValue(W));
+    case ICmpInst::ICMP_SGT:
+      return ConstantRange(CR.getSignedMin() + 1,
+                           APInt::getSignedMinValue(W));
+    case ICmpInst::ICMP_UGE: {
+      APInt UMin(CR.getUnsignedMin());
+      if (UMin.isMinValue())
+        return ConstantRange(W);
+      return ConstantRange(UMin, APInt::getNullValue(W));
+    }
+    case ICmpInst::ICMP_SGE: {
+      APInt SMin(CR.getSignedMin());
+      if (SMin.isMinSignedValue())
+        return ConstantRange(W);
+      return ConstantRange(SMin, APInt::getSignedMinValue(W));
+    }
+  }
+}
+
 /// isFullSet - Return true if this set contains all of the elements possible
 /// for this data-type
 bool ConstantRange::isFullSet() const {
@@ -156,6 +204,30 @@ bool ConstantRange::contains(const APInt &V) const {
     return Lower.ule(V) || V.ult(Upper);
 }
 
+/// contains - Return true if the argument is a subset of this range.
+/// Two equal set contain each other. The empty set is considered to be
+/// contained by all other sets.
+///
+bool ConstantRange::contains(const ConstantRange &Other) const {
+  if (isFullSet()) return true;
+  if (Other.isFullSet()) return false;
+  if (Other.isEmptySet()) return true;
+  if (isEmptySet()) return false;
+
+  if (!isWrappedSet()) {
+    if (Other.isWrappedSet())
+      return false;
+
+    return Lower.ule(Other.getLower()) && Other.getUpper().ule(Upper);
+  }
+
+  if (!Other.isWrappedSet())
+    return Other.getUpper().ule(Upper) ||
+           Lower.ule(Other.getLower());
+
+  return Other.getUpper().ule(Upper) && Lower.ule(Other.getLower());
+}
+
 /// subtract - Subtract the specified constant from the endpoints of this
 /// constant range.
 ConstantRange ConstantRange::subtract(const APInt &Val) const {
diff --git a/lib/Transforms/Scalar/PredicateSimplifier.cpp b/lib/Transforms/Scalar/PredicateSimplifier.cpp
index 24707bd4d8..c82c4ff3bf 100644
--- a/lib/Transforms/Scalar/PredicateSimplifier.cpp
+++ b/lib/Transforms/Scalar/PredicateSimplifier.cpp
@@ -990,7 +990,7 @@ namespace {
       assert(!CR.isEmptySet() && "Can't deal with empty set.");
 
       if (LV == NE)
-        return makeConstantRange(ICmpInst::ICMP_NE, CR);
+        return ConstantRange::makeICmpRegion(ICmpInst::ICMP_NE, CR);
 
       unsigned LV_s = LV & (SGT_BIT|SLT_BIT);
       unsigned LV_u = LV & (UGT_BIT|ULT_BIT);
@@ -999,73 +999,24 @@ namespace {
       ConstantRange Range(CR.getBitWidth());
 
       if (LV_s == SGT_BIT) {
-        Range = Range.maximalIntersectWith(makeConstantRange(
+        Range = Range.maximalIntersectWith(ConstantRange::makeICmpRegion(
                     hasEQ ? ICmpInst::ICMP_SGE : ICmpInst::ICMP_SGT, CR));
       } else if (LV_s == SLT_BIT) {
-        Range = Range.maximalIntersectWith(makeConstantRange(
+        Range = Range.maximalIntersectWith(ConstantRange::makeICmpRegion(
                     hasEQ ? ICmpInst::ICMP_SLE : ICmpInst::ICMP_SLT, CR));
       }
 
       if (LV_u == UGT_BIT) {
-        Range = Range.maximalIntersectWith(makeConstantRange(
+        Range = Range.maximalIntersectWith(ConstantRange::makeICmpRegion(
                     hasEQ ? ICmpInst::ICMP_UGE : ICmpInst::ICMP_UGT, CR));
       } else if (LV_u == ULT_BIT) {
-        Range = Range.maximalIntersectWith(makeConstantRange(
+        Range = Range.maximalIntersectWith(ConstantRange::makeICmpRegion(
                     hasEQ ? ICmpInst::ICMP_ULE : ICmpInst::ICMP_ULT, CR));
       }
 
       return Range;
     }
 
-    /// makeConstantRange - Creates a ConstantRange representing the set of all
-    /// value that match the ICmpInst::Predicate with any of the values in CR.
-    ConstantRange makeConstantRange(ICmpInst::Predicate ICmpOpcode,
-                                    const ConstantRange &CR) {
-      uint32_t W = CR.getBitWidth();
-      switch (ICmpOpcode) {
-        default: assert(!"Invalid ICmp opcode to makeConstantRange()");
-        case ICmpInst::ICMP_EQ:
-          return ConstantRange(CR.getLower(), CR.getUpper());
-        case ICmpInst::ICMP_NE:
-          if (CR.isSingleElement())
-            return ConstantRange(CR.getUpper(), CR.getLower());
-          return ConstantRange(W);
-        case ICmpInst::ICMP_ULT:
-          return ConstantRange(APInt::getMinValue(W), CR.getUnsignedMax());
-        case ICmpInst::ICMP_SLT:
-          return ConstantRange(APInt::getSignedMinValue(W), CR.getSignedMax());
-        case ICmpInst::ICMP_ULE: {
-          APInt UMax(CR.getUnsignedMax());
-          if (UMax.isMaxValue())
-            return ConstantRange(W);
-          return ConstantRange(APInt::getMinValue(W), UMax + 1);
-        }
-        case ICmpInst::ICMP_SLE: {
-          APInt SMax(CR.getSignedMax());
-          if (SMax.isMaxSignedValue() || (SMax+1).isMaxSignedValue())
-            return ConstantRange(W);
-          return ConstantRange(APInt::getSignedMinValue(W), SMax + 1);
-        }
-        case ICmpInst::ICMP_UGT:
-          return ConstantRange(CR.getUnsignedMin() + 1, APInt::getNullValue(W));
-        case ICmpInst::ICMP_SGT:
-          return ConstantRange(CR.getSignedMin() + 1,
-                               APInt::getSignedMinValue(W));
-        case ICmpInst::ICMP_UGE: {
-          APInt UMin(CR.getUnsignedMin());
-          if (UMin.isMinValue())
-            return ConstantRange(W);
-          return ConstantRange(UMin, APInt::getNullValue(W));
-        }
-        case ICmpInst::ICMP_SGE: {
-          APInt SMin(CR.getSignedMin());
-          if (SMin.isMinSignedValue())
-            return ConstantRange(W);
-          return ConstantRange(SMin, APInt::getSignedMinValue(W));
-        }
-      }
-    }
-
 #ifndef NDEBUG
     bool isCanonical(Value *V, DomTreeDFS::Node *Subtree) {
       return V == VN.canonicalize(V, Subtree);