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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2533 91177308-0d34-0410-b5e6-96231b3b80d8
121 lines
3.9 KiB
C++
121 lines
3.9 KiB
C++
//===-- Scalar.h - Scalar Transformations ------------------------*- C++ -*-==//
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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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class Pass;
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//===----------------------------------------------------------------------===//
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//
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// Constant Propogation Pass - A worklist driven constant propogation pass
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//
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Pass *createConstantPropogationPass();
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//===----------------------------------------------------------------------===//
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//
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// Sparse Conditional Constant Propogation Pass
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//
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Pass *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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Pass *createDeadCodeEliminationPass();
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//===----------------------------------------------------------------------===//
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//
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// AgressiveDCE - This pass uses the SSA based Agressive 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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Pass *createAgressiveDCEPass();
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//===----------------------------------------------------------------------===//
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//
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// DecomposeMultiDimRefs - Convert multi-dimensional references consisting of
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// any combination of 2 or more array and structure indices into a sequence of
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// instructions (using getelementpr and cast) so that each instruction has at
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// most one index (except structure references, which need an extra leading
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// index of [0]).
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//
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Pass *createDecomposeMultiDimRefsPass();
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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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Pass *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 cannonical 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 tendancy 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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Pass *createInstructionCombiningPass();
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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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Pass *createPromoteMemoryToRegister();
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//===----------------------------------------------------------------------===//
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//
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// These functions removes symbols from functions and modules.
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//
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Pass *createSymbolStrippingPass();
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Pass *createFullSymbolStrippingPass();
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#endif
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