Initial version of LoadValueNumbering interface

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@3539 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/llvm/Analysis/LoadValueNumbering.h b/include/llvm/Analysis/LoadValueNumbering.h
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+++ b/include/llvm/Analysis/LoadValueNumbering.h
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+//===- llvm/Analysis/LoadValueNumbering.h - Value # Load Insts --*- C++ -*-===//
+//
+// This file defines a value numbering pass that value #'s load instructions.
+// To do this, it finds lexically identical load instructions, and uses alias
+// analysis to determine which loads are guaranteed to produce the same value.
+//
+// This pass builds off of another value numbering pass to implement value
+// numbering for non-load instructions.  It uses Alias Analysis so that it can
+// disambiguate the load instructions.  The more powerful these base analyses
+// are, the more powerful the resultant analysis will be.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_ANALYSIS_LOAD_VALUE_NUMBERING_H
+#define LLVM_ANALYSIS_LOAD_VALUE_NUMBERING_H
+
+class Pass;
+
+/// createLoadValueNumberingPass - Create and return a new pass that implements
+/// the ValueNumbering interface.
+///
+Pass *createLoadValueNumberingPass();
+
+#endif