Move the FindCopyInsertPoint method of PHIElimination to a new standalone

function so that it can be shared with StrongPHIElimination.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120951 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 25 insertions, 0 deletions

diff --git a/lib/CodeGen/PHIEliminationUtils.h b/lib/CodeGen/PHIEliminationUtils.h
new file mode 100644
index 0000000000..9ac47fb4c5
--- /dev/null
+++ b/lib/CodeGen/PHIEliminationUtils.h
@@ -0,0 +1,25 @@
+//=- PHIEliminationUtils.h - Helper functions for PHI elimination *- C++ -*--=//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CODEGEN_PHIELIMINATIONUTILS_H
+#define LLVM_CODEGEN_PHIELIMINATIONUTILS_H
+
+#include "llvm/CodeGen/MachineBasicBlock.h"
+
+namespace llvm {
+    /// findPHICopyInsertPoint - Find a safe place in MBB to insert a copy from
+    /// SrcReg when following the CFG edge to SuccMBB. This needs to be after
+    /// any def of SrcReg, but before any subsequent point where control flow
+    /// might jump out of the basic block.
+    MachineBasicBlock::iterator
+    findPHICopyInsertPoint(MachineBasicBlock* MBB, MachineBasicBlock* SuccMBB,
+                           unsigned SrcReg);
+}
+
+#endif