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

llvm-svn: 74032

1 files changed, 6 insertions, 0 deletions

diff --git a/llvm/lib/Analysis/ScalarEvolution.cpp b/llvm/lib/Analysis/ScalarEvolution.cpp
index 5cbb5fac8ac..6e5dfbb35ed 100644
--- a/llvm/lib/Analysis/ScalarEvolution.cpp
+++ b/llvm/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) {}