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//===-- Passes.h - Target independent code generation passes ----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines interfaces to access the target independent code generation
// passes provided by the LLVM backend.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CODEGEN_PASSES_H
#define LLVM_CODEGEN_PASSES_H
namespace llvm {
class FunctionPass;
class PassInfo;
class TargetMachine;
// PHIElimination pass - This pass eliminates machine instruction PHI nodes by
// inserting copy instructions. This destroys SSA information, but is the
// desired input for some register allocators. This pass is "required" by these
// register allocator like this: AU.addRequiredID(PHIEliminationID);
//
extern const PassInfo *PHIEliminationID;
// TwoAddressInstruction pass - This pass reduces two-address
// instructions to use two operands. This destroys SSA information but
// it is desired by register allocators.
extern const PassInfo *TwoAddressInstructionPassID;
/// Creates a register allocator as the user specified on the command
/// line.
FunctionPass *createRegisterAllocator();
/// SimpleRegisterAllocation Pass - This pass converts the input machine code
/// from SSA form to use explicit registers by spilling every register. Wow,
/// great policy huh?
///
FunctionPass *createSimpleRegisterAllocator();
/// LocalRegisterAllocation Pass - This pass register allocates the input code a
/// basic block at a time, yielding code better than the simple register
/// allocator, but not as good as a global allocator.
///
FunctionPass *createLocalRegisterAllocator();
/// LinearScanRegisterAllocation Pass - This pass implements the
/// linear scan register allocation algorithm, a global register
/// allocator.
///
FunctionPass *createLinearScanRegisterAllocator();
/// PrologEpilogCodeInserter Pass - This pass inserts prolog and epilog code,
/// and eliminates abstract frame references.
///
FunctionPass *createPrologEpilogCodeInserter();
/// getRegisterAllocator - This creates an instance of the register allocator
/// for the Sparc.
FunctionPass *getRegisterAllocator(TargetMachine &T);
} // End llvm namespace
#endif
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