vendor/llvm/llvm-trunk-r321017

1 files changed, 44 insertions, 0 deletions

diff --git a/include/llvm/Transforms/Utils/CallPromotionUtils.h b/include/llvm/Transforms/Utils/CallPromotionUtils.h
new file mode 100644
index 0000000000000..e0bf85781d811
--- /dev/null
+++ b/include/llvm/Transforms/Utils/CallPromotionUtils.h
@@ -0,0 +1,44 @@
+//===- CallPromotionUtils.h - Utilities for call promotion ------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file declares utilities useful for promoting indirect call sites to
+// direct call sites.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_TRANSFORMS_UTILS_CALLPROMOTIONUTILS_H
+#define LLVM_TRANSFORMS_UTILS_CALLPROMOTIONUTILS_H
+
+#include "llvm/IR/CallSite.h"
+
+namespace llvm {
+
+/// Return true if the given indirect call site can be made to call \p Callee.
+///
+/// This function ensures that the number and type of the call site's arguments
+/// and return value match those of the given function. If the types do not
+/// match exactly, they must at least be bitcast compatible. If \p FailureReason
+/// is non-null and the indirect call cannot be promoted, the failure reason
+/// will be stored in it.
+bool isLegalToPromote(CallSite CS, Function *Callee,
+                      const char **FailureReason = nullptr);
+
+/// Promote the given indirect call site to conditionally call \p Callee.
+///
+/// This function creates an if-then-else structure at the location of the call
+/// site. The original call site is promoted and moved into the "then" block. A
+/// clone of the indirect call site is placed in the "else" block and returned.
+/// If \p BranchWeights is non-null, it will be used to set !prof metadata on
+/// the new conditional branch.
+Instruction *promoteCallWithIfThenElse(CallSite CS, Function *Callee,
+                                       MDNode *BranchWeights = nullptr);
+
+} // end namespace llvm
+
+#endif // LLVM_TRANSFORMS_UTILS_CALLPROMOTIONUTILS_H