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301 lines
11 KiB
C++
301 lines
11 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 was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source 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 ModulePass;
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class FunctionPass;
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class GetElementPtrInst;
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class PassInfo;
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class TerminatorInst;
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//===----------------------------------------------------------------------===//
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//
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// RaisePointerReferences - Try to eliminate as many pointer arithmetic
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// expressions as possible, by converting expressions to use getelementptr and
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// friends.
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//
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FunctionPass *createRaisePointerReferencesPass();
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//===----------------------------------------------------------------------===//
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//
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// Constant Propagation Pass - 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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// Sparse Conditional Constant Propagation Pass
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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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FunctionPass *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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// Scalar Replacement of Aggregates - Break up alloca's of aggregates into
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// multiple allocas if possible.
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//
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FunctionPass *createScalarReplAggregatesPass();
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//===----------------------------------------------------------------------===//
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//
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// GCSE - This pass is designed to be a very quick global transformation that
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// eliminates global common subexpressions from a function. It does this by
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// examining the SSA value graph of the function, instead of doing slow
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// bit-vector computations.
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//
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FunctionPass *createGCSEPass();
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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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FunctionPass *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
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// make 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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FunctionPass *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. The
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// MaxTargetAMSize is the largest element size that the target architecture
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// can handle in its addressing modes. Power of two multipliers less than or
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// equal to this value are not reduced.
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//
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FunctionPass *createLoopStrengthReducePass(unsigned MaxTargetAMSize = 1);
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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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FunctionPass *createLoopUnswitchPass();
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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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FunctionPass *createLoopUnrollPass();
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//===----------------------------------------------------------------------===//
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//
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// This pass is used to promote memory references to be register references. A
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// simple example of the transformation performed by this pass is:
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//
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// FROM CODE TO CODE
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// %X = alloca int, uint 1 ret int 42
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// store int 42, int *%X
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// %Y = load int* %X
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// ret int %Y
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//
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FunctionPass *createPromoteMemoryToRegisterPass();
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//===----------------------------------------------------------------------===//
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//
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// This pass reassociates commutative expressions in an order that is designed
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// 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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// This pass eliminates correlated conditions, such as these:
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// if (X == 0)
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// if (X > 2) ; // Known false
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// else
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// Y = X * Z; // = 0
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//
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FunctionPass *createCorrelatedExpressionEliminationPass();
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// createCondPropagationPass - This pass propagates information about
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// conditional expressions through the program, allowing it to eliminate
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// conditional 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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// CFG Simplification - 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 pass - Break all of the critical edges in the CFG by
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// inserting a dummy basic block. This pass may be "required" by passes that
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// cannot deal 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 *BreakCriticalEdgesID;
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//===----------------------------------------------------------------------===//
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//
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// LoopSimplify pass - Insert Pre-header blocks into the CFG for every function
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// in the module. This pass updates dominator information, loop information,
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// and 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 *LoopSimplifyID;
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//===----------------------------------------------------------------------===//
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//
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// This pass eliminates call instructions to the current function which occur
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// immediately before return instructions.
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//
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FunctionPass *createTailCallEliminationPass();
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//===----------------------------------------------------------------------===//
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// This pass convert malloc and free instructions to %malloc & %free function
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// calls.
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//
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FunctionPass *createLowerAllocationsPass(bool LowerMallocArgToInteger = false);
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//===----------------------------------------------------------------------===//
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// This pass converts SwitchInst instructions into a sequence of chained binary
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// branch instructions.
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//
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FunctionPass *createLowerSwitchPass();
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//===----------------------------------------------------------------------===//
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// This pass converts SelectInst instructions into conditional branch and PHI
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// instructions. If the OnlyFP flag is set to true, then only floating point
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// select instructions are lowered.
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//
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FunctionPass *createLowerSelectPass(bool OnlyFP = false);
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//===----------------------------------------------------------------------===//
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// This pass converts PackedType operations into low-level scalar operations.
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//
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FunctionPass *createLowerPackedPass();
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//===----------------------------------------------------------------------===//
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// This pass converts invoke and unwind instructions to use sjlj exception
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// handling mechanisms. Note that after this pass runs the CFG is not entirely
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// accurate (exceptional control flow edges are not correct anymore) so only
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// very simple things should be done after the lowerinvoke pass has run (like
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// generation of native code). This should *NOT* be used as a general purpose
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// "my LLVM-to-LLVM pass doesn't support the invoke instruction yet" lowering
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// pass.
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//
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FunctionPass *createLowerInvokePass();
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extern const PassInfo *LowerInvokePassID;
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//===----------------------------------------------------------------------===//
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/// createLowerGCPass - This function returns an instance of the "lowergc"
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/// pass, which lowers garbage collection intrinsics to normal LLVM code.
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///
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FunctionPass *createLowerGCPass();
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//===----------------------------------------------------------------------===//
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// Returns a pass which converts all instances of ConstantExpression
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// into regular LLVM instructions.
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FunctionPass* createLowerConstantExpressionsPass();
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//===----------------------------------------------------------------------===//
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// This pass reorders basic blocks in order to increase the number of fall-
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// through conditional branches.
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FunctionPass *createBlockPlacementPass();
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//===----------------------------------------------------------------------===//
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// This pass does partial redundancy elimination.
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FunctionPass *createPREPass();
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} // End llvm namespace
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#endif
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