1 //===-- Passes.h - Target independent code generation passes ----*- C++ -*-===//
3 // This file defines interfaces to access the target independent code generation
4 // passes provided by the LLVM backend.
6 //===----------------------------------------------------------------------===//
8 #ifndef LLVM_CODEGEN_PASSES_H
9 #define LLVM_CODEGEN_PASSES_H
15 // PHIElimination pass - This pass eliminates machine instruction PHI nodes by
16 // inserting copy instructions. This destroys SSA information, but is the
17 // desired input for some register allocators. This pass is "required" by these
18 // register allocator like this: AU.addRequiredID(PHIEliminationID);
20 extern const PassInfo *PHIEliminationID;
22 /// SimpleRegisterAllocation Pass - This pass converts the input machine code
23 /// from SSA form to use explicit registers by spilling every register. Wow,
26 FunctionPass *createSimpleRegisterAllocator();
28 /// LocalRegisterAllocation Pass - This pass register allocates the input code a
29 /// basic block at a time, yielding code better than the simple register
30 /// allocator, but not as good as a global allocator.
32 FunctionPass *createLocalRegisterAllocator();
34 /// PrologEpilogCodeInserter Pass - This pass inserts prolog and epilog code,
35 /// and eliminates abstract frame references.
37 FunctionPass *createPrologEpilogCodeInserter();
40 /// getRegisterAllocator - This creates an instance of the register allocator
42 FunctionPass *getRegisterAllocator(TargetMachine &T);