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a2c9188560
accordingly. No functional change. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112008 91177308-0d34-0410-b5e6-96231b3b80d8
96 lines
2.8 KiB
C++
96 lines
2.8 KiB
C++
//===- CodeGenRegisters.h - Register and RegisterClass Info -----*- 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 defines structures to encapsulate information gleaned from the
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// target register and register class definitions.
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//
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//===----------------------------------------------------------------------===//
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#ifndef CODEGEN_REGISTERS_H
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#define CODEGEN_REGISTERS_H
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#include "llvm/CodeGen/ValueTypes.h"
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#include "llvm/ADT/DenseMap.h"
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#include <string>
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#include <vector>
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#include <set>
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#include <cstdlib>
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namespace llvm {
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class Record;
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/// CodeGenRegister - Represents a register definition.
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struct CodeGenRegister {
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Record *TheDef;
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const std::string &getName() const;
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unsigned DeclaredSpillSize, DeclaredSpillAlignment;
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CodeGenRegister(Record *R);
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};
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struct CodeGenRegisterClass {
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Record *TheDef;
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std::string Namespace;
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std::vector<Record*> Elements;
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std::vector<MVT::SimpleValueType> VTs;
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unsigned SpillSize;
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unsigned SpillAlignment;
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int CopyCost;
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// Map SubRegIndex -> RegisterClass
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DenseMap<Record*,Record*> SubRegClasses;
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std::string MethodProtos, MethodBodies;
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const std::string &getName() const;
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const std::vector<MVT::SimpleValueType> &getValueTypes() const {return VTs;}
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unsigned getNumValueTypes() const { return VTs.size(); }
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MVT::SimpleValueType getValueTypeNum(unsigned VTNum) const {
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if (VTNum < VTs.size())
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return VTs[VTNum];
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assert(0 && "VTNum greater than number of ValueTypes in RegClass!");
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abort();
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}
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// Returns true if RC is a strict subclass.
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// RC is a sub-class of this class if it is a valid replacement for any
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// instruction operand where a register of this classis required. It must
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// satisfy these conditions:
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//
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// 1. All RC registers are also in this.
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// 2. The RC spill size must not be smaller than our spill size.
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// 3. RC spill alignment must be compatible with ours.
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//
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bool hasSubClass(const CodeGenRegisterClass *RC) const {
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if (RC->Elements.size() > Elements.size() ||
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(SpillAlignment && RC->SpillAlignment % SpillAlignment) ||
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SpillSize > RC->SpillSize)
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return false;
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std::set<Record*> RegSet;
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for (unsigned i = 0, e = Elements.size(); i != e; ++i) {
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Record *Reg = Elements[i];
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RegSet.insert(Reg);
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}
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for (unsigned i = 0, e = RC->Elements.size(); i != e; ++i) {
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Record *Reg = RC->Elements[i];
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if (!RegSet.count(Reg))
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return false;
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}
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return true;
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}
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CodeGenRegisterClass(Record *R);
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};
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}
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#endif
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