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2a993fb1c5
the interface to SplitCriticalEdge so that it splits an edge if it is critical, otherwise just returns false and noops if not. llvm-svn: 9852
68 lines
2.7 KiB
C++
68 lines
2.7 KiB
C++
//===-- Transform/Utils/BasicBlockUtils.h - BasicBlock Utils ----*- 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 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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class Pass;
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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.
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//
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void ReplaceInstWithInst(Instruction *From, Instruction *To);
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// RemoveSuccessor - Change the specified terminator instruction such that its
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// successor #SuccNum no longer exists. Because this reduces the outgoing
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// degree of the current basic block, the actual terminator instruction itself
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// may have to be changed. In the case where the last successor of the block is
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// deleted, a return instruction is inserted in its place which can cause a
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// suprising change in program behavior if it is not expected.
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//
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void RemoveSuccessor(TerminatorInst *TI, unsigned SuccNum);
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/// isCriticalEdge - Return true if the specified edge is a critical edge.
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/// Critical edges are edges from a block with multiple successors to a block
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/// with multiple predecessors.
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///
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bool isCriticalEdge(const TerminatorInst *TI, unsigned SuccNum);
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/// SplitCriticalEdge - If this edge is a critical edge, insert a new node to
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/// split the critical edge. This will update DominatorSet, ImmediateDominator,
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/// DominatorTree, and DominatorFrontier information if it is available, thus
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/// calling this pass will not invalidate either of them. This returns true if
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/// the edge was split, false otherwise.
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///
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bool SplitCriticalEdge(TerminatorInst *TI, unsigned SuccNum, Pass *P = 0);
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#endif
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