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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60501 91177308-0d34-0410-b5e6-96231b3b80d8
97 lines
3.6 KiB
C++
97 lines
3.6 KiB
C++
//===-- Local.h - Functions to perform local 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 family of functions perform various local transformations to the
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// program.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TRANSFORMS_UTILS_LOCAL_H
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#define LLVM_TRANSFORMS_UTILS_LOCAL_H
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#include "llvm/Function.h"
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namespace llvm {
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class Pass;
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class PHINode;
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class AllocaInst;
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class ConstantExpr;
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class TargetData;
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//===----------------------------------------------------------------------===//
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// Local constant propagation.
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//
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/// ConstantFoldTerminator - If a terminator instruction is predicated on a
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/// constant value, convert it into an unconditional branch to the constant
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/// destination. This is a nontrivial operation because the successors of this
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/// basic block must have their PHI nodes updated.
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///
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bool ConstantFoldTerminator(BasicBlock *BB);
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//===----------------------------------------------------------------------===//
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// Local dead code elimination.
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//
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/// isInstructionTriviallyDead - Return true if the result produced by the
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/// instruction is not used, and the instruction has no side effects.
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///
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bool isInstructionTriviallyDead(Instruction *I);
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/// RecursivelyDeleteTriviallyDeadInstructions - If the specified value is a
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/// trivially dead instruction, delete it. If that makes any of its operands
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/// trivially dead, delete them too, recursively.
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///
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/// If DeadInst is specified, the vector is filled with the instructions that
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/// are actually deleted.
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void RecursivelyDeleteTriviallyDeadInstructions(Value *V,
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SmallVectorImpl<Instruction*> *DeadInst = 0);
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//===----------------------------------------------------------------------===//
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// Control Flow Graph Restructuring.
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//
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/// MergeBasicBlockIntoOnlyPred - BB is a block with one predecessor and its
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/// predecessor is known to have one successor (BB!). Eliminate the edge
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/// between them, moving the instructions in the predecessor into BB. This
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/// deletes the predecessor block.
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///
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void MergeBasicBlockIntoOnlyPred(BasicBlock *BB);
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/// SimplifyCFG - This function is used to do simplification of a CFG. For
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/// example, it adjusts branches to branches to eliminate the extra hop, it
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/// eliminates unreachable basic blocks, and does other "peephole" optimization
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/// of the CFG. It returns true if a modification was made, possibly deleting
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/// the basic block that was pointed to.
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///
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/// WARNING: The entry node of a method may not be simplified.
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///
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bool SimplifyCFG(BasicBlock *BB);
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/// DemoteRegToStack - This function takes a virtual register computed by an
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/// Instruction and replaces it with a slot in the stack frame, allocated via
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/// alloca. This allows the CFG to be changed around without fear of
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/// invalidating the SSA information for the value. It returns the pointer to
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/// the alloca inserted to create a stack slot for X.
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///
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AllocaInst *DemoteRegToStack(Instruction &X, bool VolatileLoads = false,
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Instruction *AllocaPoint = NULL);
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/// DemotePHIToStack - This function takes a virtual register computed by a phi
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/// node and replaces it with a slot in the stack frame, allocated via alloca.
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/// The phi node is deleted and it returns the pointer to the alloca inserted.
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AllocaInst *DemotePHIToStack(PHINode *P, Instruction *AllocaPoint = NULL);
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} // End llvm namespace
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#endif
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