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Checkin headers for Utils library
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2528 91177308-0d34-0410-b5e6-96231b3b80d8
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include/llvm/Transforms/Utils/BasicBlockUtils.h
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include/llvm/Transforms/Utils/BasicBlockUtils.h
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//===-- Transform/Utils/BasicBlockUtils.h - BasicBlock Utilities -*- C++ -*-==//
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//
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// This family of functions perform manipulations on basic blocks, and
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// instructions contained within basic blocks.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TRANSFORMS_UTILS_BASICBLOCK_H
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#define LLVM_TRANSFORMS_UTILS_BASICBLOCK_H
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// FIXME: Move to this file: BasicBlock::removePredecessor, BB::splitBasicBlock
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#include "llvm/BasicBlock.h"
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class Instruction;
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// ReplaceInstWithValue - Replace all uses of an instruction (specified by BI)
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// with a value, then remove and delete the original instruction.
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//
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void ReplaceInstWithValue(BasicBlock::InstListType &BIL,
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BasicBlock::iterator &BI, Value *V);
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// ReplaceInstWithInst - Replace the instruction specified by BI with the
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// instruction specified by I. The original instruction is deleted and BI is
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// updated to point to the new instruction.
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//
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void ReplaceInstWithInst(BasicBlock::InstListType &BIL,
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BasicBlock::iterator &BI, Instruction *I);
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// ReplaceInstWithInst - Replace the instruction specified by From with the
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// instruction specified by To. Note that this is slower than providing an
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// iterator directly, because the basic block containing From must be searched
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// for the instruction.
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//
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void ReplaceInstWithInst(Instruction *From, Instruction *To);
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// InsertInstBeforeInst - Insert 'NewInst' into the basic block that 'Existing'
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// is already in, and put it right before 'Existing'. This instruction should
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// only be used when there is no iterator to Existing already around. The
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// returned iterator points to the new instruction.
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//
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BasicBlock::iterator InsertInstBeforeInst(Instruction *NewInst,
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Instruction *Existing);
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#endif
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include/llvm/Transforms/Utils/Local.h
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include/llvm/Transforms/Utils/Local.h
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//===-- Local.h - Functions to perform local transformations -----*- C++ -*--=//
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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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#include "llvm/BasicBlock.h"
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//===----------------------------------------------------------------------===//
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// Local constant propogation...
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//
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// doConstantPropogation - Constant prop a specific instruction. Returns true
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// and potentially moves the iterator if constant propogation was performed.
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//
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bool doConstantPropogation(BasicBlock *BB, BasicBlock::iterator &I);
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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, BasicBlock::iterator &I,
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TerminatorInst *T);
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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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// dceInstruction - Inspect the instruction at *BBI and figure out if it
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// isTriviallyDead. If so, remove the instruction and update the iterator to
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// point to the instruction that immediately succeeded the original instruction.
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//
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bool dceInstruction(BasicBlock::InstListType &BBIL, BasicBlock::iterator &BBI);
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//===----------------------------------------------------------------------===//
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// Control Flow Graph Restructuring...
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//
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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, and returns an
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// iterator that designates the first element remaining after the block that
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// was deleted.
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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(Function::iterator &BBIt);
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#endif
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