1 files changed, 40 insertions, 0 deletions
diff --git a/include/llvm/Transforms/Utils/LoopRotationUtils.h b/include/llvm/Transforms/Utils/LoopRotationUtils.h
new file mode 100644
index 000000000000..231e5bbb6dee
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+++ b/include/llvm/Transforms/Utils/LoopRotationUtils.h
@@ -0,0 +1,40 @@
+//===- LoopRotationUtils.h - Utilities to perform loop rotation -*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file provides utilities to convert a loop into a loop with bottom test.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_TRANSFORMS_UTILS_LOOPROTATIONUTILS_H
+#define LLVM_TRANSFORMS_UTILS_LOOPROTATIONUTILS_H
+
+namespace llvm {
+
+class AssumptionCache;
+class DominatorTree;
+class Loop;
+class LoopInfo;
+class ScalarEvolution;
+struct SimplifyQuery;
+class TargetTransformInfo;
+
+/// Convert a loop into a loop with bottom test. It may
+/// perform loop latch simplication as well if the flag RotationOnly
+/// is false. The flag Threshold represents the size threshold of the loop
+/// header. If the loop header's size exceeds the threshold, the loop rotation
+/// will give up. The flag IsUtilMode controls the heuristic used in the
+/// LoopRotation. If it is true, the profitability heuristic will be ignored.
+bool LoopRotation(Loop *L, LoopInfo *LI, const TargetTransformInfo *TTI,
+                  AssumptionCache *AC, DominatorTree *DT, ScalarEvolution *SE,
+                  const SimplifyQuery &SQ, bool RotationOnly,
+                  unsigned Threshold, bool IsUtilMode);
+
+} // namespace llvm
+
+#endif