ScalarEvolution: Analyze trip count of loops with a switch guarding the exit.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201159 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 7 insertions, 0 deletions

diff --git a/include/llvm/Analysis/ScalarEvolution.h b/include/llvm/Analysis/ScalarEvolution.h
index 80809da81a..36119acf40 100644
--- a/include/llvm/Analysis/ScalarEvolution.h
+++ b/include/llvm/Analysis/ScalarEvolution.h
@@ -469,6 +469,13 @@ namespace llvm {
                                        BasicBlock *FBB,
                                        bool IsSubExpr);
 
+    /// ComputeExitLimitFromSingleExitSwitch - Compute the number of times the
+    /// backedge of the specified loop will execute if its exit condition were a
+    /// switch with a single exiting case to ExitingBB.
+    ExitLimit
+    ComputeExitLimitFromSingleExitSwitch(const Loop *L, SwitchInst *Switch,
+                               BasicBlock *ExitingBB, bool IsSubExpr);
+
     /// ComputeLoadConstantCompareExitLimit - Given an exit condition
     /// of 'icmp op load X, cst', try to see if we can compute the
     /// backedge-taken count.