Add dead loop elimination, which removes dead loops for which we can compute

the trip count.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50382 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 8 insertions, 0 deletions

diff --git a/include/llvm/LinkAllPasses.h b/include/llvm/LinkAllPasses.h
index c13b1e63bc..35331287ce 100644
--- a/include/llvm/LinkAllPasses.h
+++ b/include/llvm/LinkAllPasses.h
@@ -114,6 +114,7 @@ namespace {
       (void) llvm::createCodeGenPreparePass();
       (void) llvm::createGVNPass();
       (void) llvm::createMemCpyOptPass();
+      (void) llvm::createDeadLoopEliminationPass();
 
       (void)new llvm::IntervalPartition();
       (void)new llvm::FindUsedTypes();
diff --git a/include/llvm/Transforms/Scalar.h b/include/llvm/Transforms/Scalar.h
index bcb791617b..2a50c37cb1 100644
--- a/include/llvm/Transforms/Scalar.h
+++ b/include/llvm/Transforms/Scalar.h
@@ -319,6 +319,13 @@ FunctionPass *createMemCpyOptPass();
 
 //===----------------------------------------------------------------------===//
 //
+// DeadLoopElimination - This pass performs DCE of non-infinite loops that it
+// can prove are dead.
+//
+LoopPass *createDeadLoopEliminationPass();
+
+//===----------------------------------------------------------------------===//
+//
 // CodeGenPrepare - This pass prepares a function for instruction selection.
 //
 FunctionPass *createCodeGenPreparePass(const TargetLowering *TLI = 0);