//===-- 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
#ifndef LLVM_CODEGEN_PASSES_H
#define LLVM_CODEGEN_PASSES_H
+#include <iosfwd>
+#include <string>
+
namespace llvm {
-class FunctionPass;
-class PassInfo;
-class TargetMachine;
+ class FunctionPass;
+ class PassInfo;
+ class TargetMachine;
+ class RegisterCoalescer;
-// 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;
-
-/// 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);
+ /// createUnreachableBlockEliminationPass - The LLVM code generator does not
+ /// work well with unreachable basic blocks (what live ranges make sense for a
+ /// block that cannot be reached?). As such, a code generator should either
+ /// not instruction select unreachable blocks, or it can run this pass as it's
+ /// last LLVM modifying pass to clean up blocks that are not reachable from
+ /// the entry block.
+ FunctionPass *createUnreachableBlockEliminationPass();
+
+ /// MachineFunctionPrinter pass - This pass prints out the machine function to
+ /// standard error, as a debugging tool.
+ FunctionPass *createMachineFunctionPrinterPass(std::ostream *OS,
+ const std::string &Banner ="");
+
+ /// 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;
+
+ /// StrongPHIElimination 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);
+ /// This pass is still in development
+ extern const PassInfo *StrongPHIEliminationID;
+
+ /// SimpleRegisterCoalescing pass. Aggressively coalesces every register
+ /// copy it can.
+ ///
+ extern const PassInfo *SimpleRegisterCoalescingID;
+
+ /// 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();
+
+ /// BigBlockRegisterAllocation Pass - The BigBlock register allocator
+ /// munches single basic blocks at a time, like the local register
+ /// allocator. While the BigBlock allocator is a little slower, and uses
+ /// somewhat more memory than the local register allocator, it tends to
+ /// yield the best allocations (of any of the allocators) for blocks that
+ /// have hundreds or thousands of instructions in sequence.
+ ///
+ FunctionPass *createBigBlockRegisterAllocator();
+
+ /// LinearScanRegisterAllocation Pass - This pass implements the linear scan
+ /// register allocation algorithm, a global register allocator.
+ ///
+ FunctionPass *createLinearScanRegisterAllocator();
+
+ /// SimpleRegisterCoalescing Pass - Coalesce all copies possible. Can run
+ /// independently of the register allocator.
+ ///
+ RegisterCoalescer *createSimpleRegisterCoalescer();
+
+ /// PrologEpilogCodeInserter Pass - This pass inserts prolog and epilog code,
+ /// and eliminates abstract frame references.
+ ///
+ FunctionPass *createPrologEpilogCodeInserter();
+
+ /// LowerSubregs Pass - This pass lowers subregs to register-register copies
+ /// which yields suboptimal, but correct code if the register allocator
+ /// cannot coalesce all subreg operations during allocation.
+ ///
+ FunctionPass *createLowerSubregsPass();
+
+ /// createPostRAScheduler - under development.
+ FunctionPass *createPostRAScheduler();
+
+ /// BranchFolding Pass - This pass performs machine code CFG based
+ /// optimizations to delete branches to branches, eliminate branches to
+ /// successor blocks (creating fall throughs), and eliminating branches over
+ /// branches.
+ FunctionPass *createBranchFoldingPass(bool DefaultEnableTailMerge);
+
+ /// IfConverter Pass - This pass performs machine code if conversion.
+ FunctionPass *createIfConverterPass();
+
+ /// DebugLabelFoldingPass - This pass prunes out redundant debug labels. This
+ /// allows a debug emitter to determine if the range of two labels is empty,
+ /// by seeing if the labels map to the same reduced label.
+ FunctionPass *createDebugLabelFoldingPass();
+
+ /// MachineCodeDeletion Pass - This pass deletes all of the machine code for
+ /// the current function, which should happen after the function has been
+ /// emitted to a .s file or to memory.
+ FunctionPass *createMachineCodeDeleter();
+
+ /// getRegisterAllocator - This creates an instance of the register allocator
+ /// for the Sparc.
+ FunctionPass *getRegisterAllocator(TargetMachine &T);
+
+ /// IntrinsicLowering Pass - Performs target-independent LLVM IR
+ /// transformations for highly portable collectors.
+ FunctionPass *createGCLoweringPass();
+
+ /// MachineCodeAnalysis Pass - Target-independent pass to mark safe points in
+ /// machine code. Must be added very late during code generation, just prior
+ /// to output, and importantly after all CFG transformations (such as branch
+ /// folding).
+ FunctionPass *createGCMachineCodeAnalysisPass();
+
+ /// Deleter Pass - Releases collector metadata.
+ ///
+ FunctionPass *createCollectorMetadataDeleter();
+
+ /// Creates a pass to print collector metadata.
+ ///
+ FunctionPass *createCollectorMetadataPrinter(std::ostream &OS);
+
+ /// createMachineLICMPass - This pass performs LICM on machine instructions.
+ ///
+ FunctionPass *createMachineLICMPass();
} // End llvm namespace
projects / oota-llvm.git / blobdiff