71 lines
2.4 KiB
C
71 lines
2.4 KiB
C
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//===- GIMatchDagEdge.h - Represent a shared operand list for nodes -------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_UTILS_TABLEGEN_GIMATCHDAGEDGE_H
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#define LLVM_UTILS_TABLEGEN_GIMATCHDAGEDGE_H
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#include "llvm/ADT/StringRef.h"
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namespace llvm {
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class raw_ostream;
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class GIMatchDagInstr;
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class GIMatchDagOperand;
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/// Represents an edge that connects two instructions together via a pair of
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/// operands. For example:
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/// %a = FOO ...
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/// %0 = BAR %a
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/// %1 = BAZ %a
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/// would have two edges for %a like so:
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/// BAR:Op#1 --[a]----> Op#0:FOO
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/// ^
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/// BAZ:Op#1 --[a]------/
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/// Ideally, all edges in the DAG are from a use to a def as this is a many
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/// to one edge but edges from defs to uses are supported too.
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class GIMatchDagEdge {
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/// The name of the edge. For example,
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/// (FOO $a, $b, $c)
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/// (BAR $d, $e, $a)
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/// will create an edge named 'a' to connect FOO to BAR. Although the name
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/// refers to the edge, the canonical value of 'a' is the operand that defines
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/// it.
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StringRef Name;
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const GIMatchDagInstr *FromMI;
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const GIMatchDagOperand *FromMO;
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const GIMatchDagInstr *ToMI;
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const GIMatchDagOperand *ToMO;
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public:
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GIMatchDagEdge(StringRef Name, const GIMatchDagInstr *FromMI, const GIMatchDagOperand *FromMO,
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const GIMatchDagInstr *ToMI, const GIMatchDagOperand *ToMO)
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: Name(Name), FromMI(FromMI), FromMO(FromMO), ToMI(ToMI), ToMO(ToMO) {}
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StringRef getName() const { return Name; }
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const GIMatchDagInstr *getFromMI() const { return FromMI; }
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const GIMatchDagOperand *getFromMO() const { return FromMO; }
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const GIMatchDagInstr *getToMI() const { return ToMI; }
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const GIMatchDagOperand *getToMO() const { return ToMO; }
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/// Flip the direction of the edge.
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void reverse();
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/// Does this edge run from a def to (one of many) uses?
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bool isDefToUse() const;
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LLVM_DUMP_METHOD void print(raw_ostream &OS) const;
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#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
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LLVM_DUMP_METHOD void dump() const;
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#endif // if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
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};
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raw_ostream &operator<<(raw_ostream &OS, const GIMatchDagEdge &E);
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} // end namespace llvm
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#endif // ifndef LLVM_UTILS_TABLEGEN_GIMATCHDAGEDGE_H
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