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6f65d79750
constants out of loops. These aren't covered by the regular LICM pass, because in LLVM IR constants don't require separate instructions. They're not always covered by the MachineLICM pass either, because it doesn't know how to unfold folded constant-pool loads. This is somewhat experimental at this point, and off by default. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82076 91177308-0d34-0410-b5e6-96231b3b80d8
362 lines
13 KiB
C++
362 lines
13 KiB
C++
//===-- Scalar.h - Scalar Transformations -----------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This header file defines prototypes for accessor functions that expose passes
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// in the Scalar transformations library.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TRANSFORMS_SCALAR_H
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#define LLVM_TRANSFORMS_SCALAR_H
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namespace llvm {
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class FunctionPass;
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class Pass;
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class GetElementPtrInst;
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class PassInfo;
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class TerminatorInst;
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class TargetLowering;
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//===----------------------------------------------------------------------===//
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//
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// ConstantPropagation - A worklist driven constant propagation pass
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//
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FunctionPass *createConstantPropagationPass();
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//===----------------------------------------------------------------------===//
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//
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// SCCP - Sparse conditional constant propagation.
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//
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FunctionPass *createSCCPPass();
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//===----------------------------------------------------------------------===//
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//
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// DeadInstElimination - This pass quickly removes trivially dead instructions
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// without modifying the CFG of the function. It is a BasicBlockPass, so it
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// runs efficiently when queued next to other BasicBlockPass's.
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//
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Pass *createDeadInstEliminationPass();
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//===----------------------------------------------------------------------===//
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//
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// DeadCodeElimination - This pass is more powerful than DeadInstElimination,
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// because it is worklist driven that can potentially revisit instructions when
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// their other instructions become dead, to eliminate chains of dead
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// computations.
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//
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FunctionPass *createDeadCodeEliminationPass();
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//===----------------------------------------------------------------------===//
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//
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// DeadStoreElimination - This pass deletes stores that are post-dominated by
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// must-aliased stores and are not loaded used between the stores.
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//
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FunctionPass *createDeadStoreEliminationPass();
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//===----------------------------------------------------------------------===//
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//
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// AggressiveDCE - This pass uses the SSA based Aggressive DCE algorithm. This
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// algorithm assumes instructions are dead until proven otherwise, which makes
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// it more successful are removing non-obviously dead instructions.
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//
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FunctionPass *createAggressiveDCEPass();
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//===----------------------------------------------------------------------===//
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//
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// ScalarReplAggregates - Break up alloca's of aggregates into multiple allocas
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// if possible.
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//
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FunctionPass *createScalarReplAggregatesPass(signed Threshold = -1);
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//===----------------------------------------------------------------------===//
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//
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// InductionVariableSimplify - Transform induction variables in a program to all
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// use a single canonical induction variable per loop.
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//
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Pass *createIndVarSimplifyPass();
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//===----------------------------------------------------------------------===//
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//
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// InstructionCombining - Combine instructions to form fewer, simple
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// instructions. This pass does not modify the CFG, and has a tendency to make
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// instructions dead, so a subsequent DCE pass is useful.
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//
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// This pass combines things like:
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// %Y = add int 1, %X
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// %Z = add int 1, %Y
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// into:
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// %Z = add int 2, %X
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//
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FunctionPass *createInstructionCombiningPass();
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//===----------------------------------------------------------------------===//
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//
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// LICM - This pass is a loop invariant code motion and memory promotion pass.
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//
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Pass *createLICMPass();
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//===----------------------------------------------------------------------===//
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//
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// LoopStrengthReduce - This pass is strength reduces GEP instructions that use
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// a loop's canonical induction variable as one of their indices. It takes an
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// optional parameter used to consult the target machine whether certain
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// transformations are profitable.
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//
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Pass *createLoopStrengthReducePass(const TargetLowering *TLI = 0);
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//===----------------------------------------------------------------------===//
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//
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// LoopUnswitch - This pass is a simple loop unswitching pass.
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//
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Pass *createLoopUnswitchPass(bool OptimizeForSize = false);
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//===----------------------------------------------------------------------===//
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//
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// LoopUnroll - This pass is a simple loop unrolling pass.
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//
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Pass *createLoopUnrollPass();
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//===----------------------------------------------------------------------===//
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//
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// LoopRotate - This pass is a simple loop rotating pass.
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//
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Pass *createLoopRotatePass();
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//===----------------------------------------------------------------------===//
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//
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// LoopIndexSplit - This pass divides loop's iteration range by spliting loop
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// such that each individual loop is executed efficiently.
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//
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Pass *createLoopIndexSplitPass();
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//===----------------------------------------------------------------------===//
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//
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// PromoteMemoryToRegister - This pass is used to promote memory references to
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// be register references. A simple example of the transformation performed by
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// this pass is:
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//
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// FROM CODE TO CODE
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// %X = alloca i32, i32 1 ret i32 42
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// store i32 42, i32 *%X
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// %Y = load i32* %X
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// ret i32 %Y
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//
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FunctionPass *createPromoteMemoryToRegisterPass();
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extern const PassInfo *const PromoteMemoryToRegisterID;
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//===----------------------------------------------------------------------===//
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//
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// DemoteRegisterToMemoryPass - This pass is used to demote registers to memory
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// references. In basically undoes the PromoteMemoryToRegister pass to make cfg
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// hacking easier.
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//
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FunctionPass *createDemoteRegisterToMemoryPass();
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extern const PassInfo *const DemoteRegisterToMemoryID;
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//===----------------------------------------------------------------------===//
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//
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// Reassociate - This pass reassociates commutative expressions in an order that
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// is designed to promote better constant propagation, GCSE, LICM, PRE...
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//
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// For example: 4 + (x + 5) -> x + (4 + 5)
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//
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FunctionPass *createReassociatePass();
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//===----------------------------------------------------------------------===//
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//
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// CondPropagationPass - This pass propagates information about conditional
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// expressions through the program, allowing it to eliminate conditional
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// branches in some cases.
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//
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FunctionPass *createCondPropagationPass();
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//===----------------------------------------------------------------------===//
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//
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// TailDuplication - Eliminate unconditional branches through controlled code
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// duplication, creating simpler CFG structures.
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//
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FunctionPass *createTailDuplicationPass();
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//===----------------------------------------------------------------------===//
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//
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// JumpThreading - Thread control through mult-pred/multi-succ blocks where some
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// preds always go to some succ.
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//
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FunctionPass *createJumpThreadingPass();
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//===----------------------------------------------------------------------===//
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//
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// CFGSimplification - Merge basic blocks, eliminate unreachable blocks,
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// simplify terminator instructions, etc...
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//
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FunctionPass *createCFGSimplificationPass();
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//===----------------------------------------------------------------------===//
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//
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// BreakCriticalEdges - Break all of the critical edges in the CFG by inserting
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// a dummy basic block. This pass may be "required" by passes that cannot deal
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// with critical edges. For this usage, a pass must call:
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//
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// AU.addRequiredID(BreakCriticalEdgesID);
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//
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// This pass obviously invalidates the CFG, but can update forward dominator
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// (set, immediate dominators, tree, and frontier) information.
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//
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FunctionPass *createBreakCriticalEdgesPass();
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extern const PassInfo *const BreakCriticalEdgesID;
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//===----------------------------------------------------------------------===//
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//
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// LoopSimplify - Insert Pre-header blocks into the CFG for every function in
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// the module. This pass updates dominator information, loop information, and
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// does not add critical edges to the CFG.
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//
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// AU.addRequiredID(LoopSimplifyID);
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//
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FunctionPass *createLoopSimplifyPass();
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extern const PassInfo *const LoopSimplifyID;
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//===----------------------------------------------------------------------===//
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//
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// LowerAllocations - Turn malloc and free instructions into @malloc and @free
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// calls.
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//
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// AU.addRequiredID(LowerAllocationsID);
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//
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Pass *createLowerAllocationsPass(bool LowerMallocArgToInteger = false);
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extern const PassInfo *const LowerAllocationsID;
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//===----------------------------------------------------------------------===//
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//
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// TailCallElimination - This pass eliminates call instructions to the current
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// function which occur immediately before return instructions.
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//
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FunctionPass *createTailCallEliminationPass();
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//===----------------------------------------------------------------------===//
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//
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// LowerSwitch - This pass converts SwitchInst instructions into a sequence of
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// chained binary branch instructions.
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//
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FunctionPass *createLowerSwitchPass();
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extern const PassInfo *const LowerSwitchID;
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//===----------------------------------------------------------------------===//
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//
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// LowerInvoke - This pass converts invoke and unwind instructions to use sjlj
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// exception handling mechanisms. Note that after this pass runs the CFG is not
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// entirely accurate (exceptional control flow edges are not correct anymore) so
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// only very simple things should be done after the lowerinvoke pass has run
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// (like generation of native code). This should *NOT* be used as a general
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// purpose "my LLVM-to-LLVM pass doesn't support the invoke instruction yet"
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// lowering pass.
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//
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FunctionPass *createLowerInvokePass(const TargetLowering *TLI = 0);
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extern const PassInfo *const LowerInvokePassID;
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//===----------------------------------------------------------------------===//
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//
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// BlockPlacement - This pass reorders basic blocks in order to increase the
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// number of fall-through conditional branches.
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//
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FunctionPass *createBlockPlacementPass();
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//===----------------------------------------------------------------------===//
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//
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// LCSSA - This pass inserts phi nodes at loop boundaries to simplify other loop
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// optimizations.
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//
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Pass *createLCSSAPass();
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extern const PassInfo *const LCSSAID;
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//===----------------------------------------------------------------------===//
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//
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// PredicateSimplifier - This pass collapses duplicate variables into one
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// canonical form, and tries to simplify expressions along the way.
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//
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FunctionPass *createPredicateSimplifierPass();
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//===----------------------------------------------------------------------===//
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//
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// GVN-PRE - This pass performs global value numbering and partial redundancy
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// elimination.
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//
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FunctionPass *createGVNPREPass();
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//===----------------------------------------------------------------------===//
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//
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// GVN - This pass performs global value numbering and redundant load
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// elimination cotemporaneously.
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//
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FunctionPass *createGVNPass();
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//===----------------------------------------------------------------------===//
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//
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// MemCpyOpt - This pass performs optimizations related to eliminating memcpy
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// calls and/or combining multiple stores into memset's.
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//
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FunctionPass *createMemCpyOptPass();
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//===----------------------------------------------------------------------===//
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//
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// LoopDeletion - This pass performs DCE of non-infinite loops that it
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// can prove are dead.
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//
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Pass *createLoopDeletionPass();
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//===----------------------------------------------------------------------===//
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//
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/// createSimplifyLibCallsPass - This pass optimizes specific calls to
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/// specific well-known (library) functions.
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FunctionPass *createSimplifyLibCallsPass();
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//===----------------------------------------------------------------------===//
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//
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/// createSimplifyHalfPowrLibCallsPass - This is an experimental pass that
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/// optimizes specific half_pow functions.
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FunctionPass *createSimplifyHalfPowrLibCallsPass();
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//===----------------------------------------------------------------------===//
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//
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// CodeGenPrepare - This pass prepares a function for instruction selection.
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//
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FunctionPass *createCodeGenPreparePass(const TargetLowering *TLI = 0);
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//===----------------------------------------------------------------------===//
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//
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// CodeGenLICM - This pass performs late LICM; hoisting constants out of loops.
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//
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Pass *createCodeGenLICMPass();
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//===----------------------------------------------------------------------===//
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//
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// InstructionNamer - Give any unnamed non-void instructions "tmp" names.
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//
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FunctionPass *createInstructionNamerPass();
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extern const PassInfo *const InstructionNamerID;
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//===----------------------------------------------------------------------===//
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//
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// SSI - This pass converts instructions to Static Single Information form
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// on demand.
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//
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FunctionPass *createSSIPass();
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//===----------------------------------------------------------------------===//
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//
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// SSI - This pass converts every non-void instuction to Static Single
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// Information form.
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//
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FunctionPass *createSSIEverythingPass();
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} // End llvm namespace
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#endif
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