Add an isAllOnesValue utility function, similar to isZero and isOne.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74032 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 11 insertions, 0 deletions

diff --git a/include/llvm/Analysis/ScalarEvolution.h b/include/llvm/Analysis/ScalarEvolution.h
index 1c1298a9a1..311d0d03e0 100644
--- a/include/llvm/Analysis/ScalarEvolution.h
+++ b/include/llvm/Analysis/ScalarEvolution.h
@@ -82,6 +82,11 @@ namespace llvm {
     ///
     bool isOne() const;
 
+    /// isAllOnesValue - Return true if the expression is a constant
+    /// all-ones value.
+    ///
+    bool isAllOnesValue() const;
+
     /// replaceSymbolicValuesWithConcrete - If this SCEV internally references
     /// the symbolic value "Sym", construct and return a new SCEV that produces
     /// the same value, but which uses the concrete value Conc instead of the
diff --git a/lib/Analysis/ScalarEvolution.cpp b/lib/Analysis/ScalarEvolution.cpp
index 5cbb5fac8a..6e5dfbb35e 100644
--- a/lib/Analysis/ScalarEvolution.cpp
+++ b/lib/Analysis/ScalarEvolution.cpp
@@ -132,6 +132,12 @@ bool SCEV::isOne() const {
   return false;
 }
 
+bool SCEV::isAllOnesValue() const {
+  if (const SCEVConstant *SC = dyn_cast<SCEVConstant>(this))
+    return SC->getValue()->isAllOnesValue();
+  return false;
+}
+
 SCEVCouldNotCompute::SCEVCouldNotCompute() :
   SCEV(scCouldNotCompute) {}