forked from OSchip/llvm-project
55 lines
1.5 KiB
C++
55 lines
1.5 KiB
C++
//===-- llvm/CodeGen/SDNodeOrdering.h - SDNode Ordering ---------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file declares the SDNodeOrdering class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_SDNODEORDERING_H
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#define LLVM_CODEGEN_SDNODEORDERING_H
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#include "llvm/ADT/DenseMap.h"
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namespace llvm {
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class SDNode;
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/// SDNodeOrdering - Maps a unique (monotonically increasing) value to each
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/// SDNode that roughly corresponds to the ordering of the original LLVM
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/// instruction. This is used for turning off scheduling, because we'll forgo
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/// the normal scheduling algorithms and output the instructions according to
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/// this ordering.
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class SDNodeOrdering {
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DenseMap<const SDNode*, unsigned> OrderMap;
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void operator=(const SDNodeOrdering&); // Do not implement.
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SDNodeOrdering(const SDNodeOrdering&); // Do not implement.
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public:
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SDNodeOrdering() {}
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void add(const SDNode *Node, unsigned O) {
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OrderMap[Node] = O;
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}
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void remove(const SDNode *Node) {
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DenseMap<const SDNode*, unsigned>::iterator Itr = OrderMap.find(Node);
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if (Itr != OrderMap.end())
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OrderMap.erase(Itr);
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}
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void clear() {
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OrderMap.clear();
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}
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unsigned getOrder(const SDNode *Node) {
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return OrderMap[Node];
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}
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};
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} // end llvm namespace
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#endif
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