llvm-mirror/include/llvm/Transforms/Utils.h

//===- llvm/Transforms/Utils.h - Utility Transformations --------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This header file defines prototypes for accessor functions that expose passes
// in the Utils transformations library.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_TRANSFORMS_UTILS_H
#define LLVM_TRANSFORMS_UTILS_H

namespace llvm {

class ModulePass;
class FunctionPass;
class Pass;

//===----------------------------------------------------------------------===//
// createMetaRenamerPass - Rename everything with metasyntatic names.
//
ModulePass *createMetaRenamerPass();

//===----------------------------------------------------------------------===//
//
// LowerInvoke - This pass removes invoke instructions, converting them to call
// instructions.
//
FunctionPass *createLowerInvokePass();
extern char &LowerInvokePassID;

//===----------------------------------------------------------------------===//
//
// InstructionNamer - Give any unnamed non-void instructions "tmp" names.
//
FunctionPass *createInstructionNamerPass();
extern char &InstructionNamerID;

//===----------------------------------------------------------------------===//
//
// LowerSwitch - This pass converts SwitchInst instructions into a sequence of
// chained binary branch instructions.
//
FunctionPass *createLowerSwitchPass();
extern char &LowerSwitchID;

//===----------------------------------------------------------------------===//
//
// EntryExitInstrumenter pass - Instrument function entry/exit with calls to
// mcount(), @__cyg_profile_func_{enter,exit} and the like. There are two
// variants, intended to run pre- and post-inlining, respectively.
//
FunctionPass *createEntryExitInstrumenterPass();
FunctionPass *createPostInlineEntryExitInstrumenterPass();

//===----------------------------------------------------------------------===//
//
// BreakCriticalEdges - Break all of the critical edges in the CFG by inserting
// a dummy basic block. This pass may be "required" by passes that cannot deal
// with critical edges. For this usage, a pass must call:
//
//   AU.addRequiredID(BreakCriticalEdgesID);
//
// This pass obviously invalidates the CFG, but can update forward dominator
// (set, immediate dominators, tree, and frontier) information.
//
FunctionPass *createBreakCriticalEdgesPass();
extern char &BreakCriticalEdgesID;

//===----------------------------------------------------------------------===//
//
// LCSSA - This pass inserts phi nodes at loop boundaries to simplify other loop
// optimizations.
//
Pass *createLCSSAPass();
extern char &LCSSAID;

//===----------------------------------------------------------------------===//
//
// AddDiscriminators - Add DWARF path discriminators to the IR.
FunctionPass *createAddDiscriminatorsPass();

//===----------------------------------------------------------------------===//
//
// PromoteMemoryToRegister - This pass is used to promote memory references to
// be register references. A simple example of the transformation performed by
// this pass is:
//
//        FROM CODE                           TO CODE
//   %X = alloca i32, i32 1                 ret i32 42
//   store i32 42, i32 *%X
//   %Y = load i32* %X
//   ret i32 %Y
//
FunctionPass *createPromoteMemoryToRegisterPass();

//===----------------------------------------------------------------------===//
//
// LoopSimplify - Insert Pre-header blocks into the CFG for every function in
// the module.  This pass updates dominator information, loop information, and
// does not add critical edges to the CFG.
//
//   AU.addRequiredID(LoopSimplifyID);
//
Pass *createLoopSimplifyPass();
extern char &LoopSimplifyID;

/// This function returns a new pass that downgrades the debug info in the
/// module to line tables only.
ModulePass *createStripNonLineTableDebugLegacyPass();

//===----------------------------------------------------------------------===//
//
// ControlHeightReudction - Merges conditional blocks of code and reduces the
// number of conditional branches in the hot paths based on profiles.
//
FunctionPass *createControlHeightReductionLegacyPass();

//===----------------------------------------------------------------------===//
//
// InjectTLIMappingsLegacy - populates the VFABI attribute with the
// scalar-to-vector mappings from the TargetLibraryInfo.
//
FunctionPass *createInjectTLIMappingsLegacyPass();

//===----------------------------------------------------------------------===//
//
// UnifyLoopExits - For each loop, creates a new block N such that all exiting
// blocks branch to N, and then N distributes control flow to all the original
// exit blocks.
//
FunctionPass *createUnifyLoopExitsPass();

//===----------------------------------------------------------------------===//
//
// FixIrreducible - Convert each SCC with irreducible control-flow
// into a natural loop.
//
FunctionPass *createFixIrreduciblePass();

//===----------------------------------------------------------------------===//
//
// AssumeSimplify - remove redundant assumes and merge assumes in the same
// BasicBlock when possible.
//
FunctionPass *createAssumeSimplifyPass();

//===----------------------------------------------------------------------===//
//
// CanonicalizeFreezeInLoops - Canonicalize freeze instructions in loops so they
// don't block SCEV.
//
Pass *createCanonicalizeFreezeInLoopsPass();
} // namespace llvm

#endif