[SCEV] Extract out a getRangeForAffineAR; NFC

Pure code-motion change.  Will be used later in making getRange more clever.

llvm-svn: 262437

1 files changed, 6 insertions, 0 deletions

diff --git a/llvm/include/llvm/Analysis/ScalarEvolution.h b/llvm/include/llvm/Analysis/ScalarEvolution.h
index 5975d3b95f0..9e5bb00e6bb 100644
--- a/llvm/include/llvm/Analysis/ScalarEvolution.h
+++ b/llvm/include/llvm/Analysis/ScalarEvolution.h
@@ -666,6 +666,12 @@ namespace llvm {
     /// Determine the range for a particular SCEV.
     ConstantRange getRange(const SCEV *S, RangeSignHint Hint);
 
+    /// Determines the range for the affine SCEVAddRecExpr {\p Start,+,\p Stop}.
+    /// Helper for \c getRange.
+    ConstantRange getRangeForAffineAR(const SCEV *Start, const SCEV *Stop,
+                                      const SCEV *MaxBECount,
+                                      unsigned BitWidth);
+
     /// We know that there is no SCEV for the specified value.  Analyze the
     /// expression.
     const SCEV *createSCEV(Value *V);