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71499ded4d
more operands and the two first operands are constrained to be the
same. The pass takes an instruction of the form:
a = b op c
and transforms it into:
a = b
a = a op c
and also preserves live variables.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10512 91177308-0d34-0410-b5e6-96231b3b80d8
52 lines
1.7 KiB
C++
52 lines
1.7 KiB
C++
//===-- llvm/CodeGen/TwoAddressInstructionPass.h - Two-Address instruction pass -*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the Two-Address instruction rewriter pass. In
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// some architectures instructions have a combined source/destination
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// operand. In those cases the instruction cannot have three operands
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// as the destination is implicit (for example ADD %EAX, %EBX on the
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// IA-32). After code generation this restrictions are not handled and
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// instructions may have three operands. This pass remedies this and
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// reduces all two-address instructions to two operands.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_TWOADDRESSINSTRUCTIONPASS_H
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#define LLVM_CODEGEN_TWOADDRESSINSTRUCTIONPASS_H
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/CodeGen/MachineBasicBlock.h"
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#include <iostream>
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#include <map>
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namespace llvm {
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class LiveVariables;
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class MRegisterInfo;
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class TwoAddressInstructionPass : public MachineFunctionPass
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{
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private:
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MachineFunction* mf_;
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const TargetMachine* tm_;
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const MRegisterInfo* mri_;
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LiveVariables* lv_;
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public:
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virtual void getAnalysisUsage(AnalysisUsage &AU) const;
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private:
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/// runOnMachineFunction - pass entry point
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bool runOnMachineFunction(MachineFunction&);
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};
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} // End llvm namespace
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#endif
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