Imported Upstream version 6.0.0.172

Former-commit-id: f3cc9b82f3e5bd8f0fd3ebc098f789556b44e9cd

external/llvm/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_LIB_CODEGEN_PHIELIMINATIONUTILS_H
+#define LLVM_LIB_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