Merge "Update prebuilt Clang to r353983." into p9.0HEADp9.0-backupp9.0

1 files changed, 45 insertions, 0 deletions

diff --git a/clang-r353983/include/llvm/Transforms/Utils/PromoteMemToReg.h b/clang-r353983/include/llvm/Transforms/Utils/PromoteMemToReg.h
new file mode 100644
index 00000000..b2b4507b
--- /dev/null
+++ b/clang-r353983/include/llvm/Transforms/Utils/PromoteMemToReg.h
@@ -0,0 +1,45 @@
+//===- PromoteMemToReg.h - Promote Allocas to Scalars -----------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file exposes an interface to promote alloca instructions to SSA
+// registers, by using the SSA construction algorithm.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_TRANSFORMS_UTILS_PROMOTEMEMTOREG_H
+#define LLVM_TRANSFORMS_UTILS_PROMOTEMEMTOREG_H
+
+namespace llvm {
+
+template <typename T> class ArrayRef;
+class AllocaInst;
+class DominatorTree;
+class AliasSetTracker;
+class AssumptionCache;
+
+/// Return true if this alloca is legal for promotion.
+///
+/// This is true if there are only loads, stores, and lifetime markers
+/// (transitively) using this alloca. This also enforces that there is only
+/// ever one layer of bitcasts or GEPs between the alloca and the lifetime
+/// markers.
+bool isAllocaPromotable(const AllocaInst *AI);
+
+/// Promote the specified list of alloca instructions into scalar
+/// registers, inserting PHI nodes as appropriate.
+///
+/// This function makes use of DominanceFrontier information.  This function
+/// does not modify the CFG of the function at all.  All allocas must be from
+/// the same function.
+///
+void PromoteMemToReg(ArrayRef<AllocaInst *> Allocas, DominatorTree &DT,
+                     AssumptionCache *AC = nullptr);
+
+} // End llvm namespace
+
+#endif