mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-10-28 14:32:51 +01:00
96 lines
3.8 KiB
C++
96 lines
3.8 KiB
C++
//===-- Transform/Utils/BasicBlockUtils.h - BasicBlock Utils ----*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file was developed by the LLVM research group and is distributed under
|
|
// the University of Illinois Open Source License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This family of functions perform manipulations on basic blocks, and
|
|
// instructions contained within basic blocks.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_TRANSFORMS_UTILS_BASICBLOCK_H
|
|
#define LLVM_TRANSFORMS_UTILS_BASICBLOCK_H
|
|
|
|
// FIXME: Move to this file: BasicBlock::removePredecessor, BB::splitBasicBlock
|
|
|
|
#include "llvm/BasicBlock.h"
|
|
#include "llvm/Support/CFG.h"
|
|
|
|
namespace llvm {
|
|
|
|
class Instruction;
|
|
class Pass;
|
|
|
|
// ReplaceInstWithValue - Replace all uses of an instruction (specified by BI)
|
|
// with a value, then remove and delete the original instruction.
|
|
//
|
|
void ReplaceInstWithValue(BasicBlock::InstListType &BIL,
|
|
BasicBlock::iterator &BI, Value *V);
|
|
|
|
// ReplaceInstWithInst - Replace the instruction specified by BI with the
|
|
// instruction specified by I. The original instruction is deleted and BI is
|
|
// updated to point to the new instruction.
|
|
//
|
|
void ReplaceInstWithInst(BasicBlock::InstListType &BIL,
|
|
BasicBlock::iterator &BI, Instruction *I);
|
|
|
|
// ReplaceInstWithInst - Replace the instruction specified by From with the
|
|
// instruction specified by To.
|
|
//
|
|
void ReplaceInstWithInst(Instruction *From, Instruction *To);
|
|
|
|
|
|
// RemoveSuccessor - Change the specified terminator instruction such that its
|
|
// successor #SuccNum no longer exists. Because this reduces the outgoing
|
|
// degree of the current basic block, the actual terminator instruction itself
|
|
// may have to be changed. In the case where the last successor of the block is
|
|
// deleted, a return instruction is inserted in its place which can cause a
|
|
// suprising change in program behavior if it is not expected.
|
|
//
|
|
void RemoveSuccessor(TerminatorInst *TI, unsigned SuccNum);
|
|
|
|
/// isCriticalEdge - Return true if the specified edge is a critical edge.
|
|
/// Critical edges are edges from a block with multiple successors to a block
|
|
/// with multiple predecessors.
|
|
///
|
|
bool isCriticalEdge(const TerminatorInst *TI, unsigned SuccNum);
|
|
|
|
/// SplitCriticalEdge - If this edge is a critical edge, insert a new node to
|
|
/// split the critical edge. This will update DominatorSet, ImmediateDominator,
|
|
/// DominatorTree, and DominatorFrontier information if it is available, thus
|
|
/// calling this pass will not invalidate either of them. This returns true if
|
|
/// the edge was split, false otherwise.
|
|
///
|
|
bool SplitCriticalEdge(TerminatorInst *TI, unsigned SuccNum, Pass *P = 0);
|
|
|
|
inline bool SplitCriticalEdge(BasicBlock *BB, succ_iterator SI, Pass *P = 0) {
|
|
return SplitCriticalEdge(BB->getTerminator(), SI.getSuccessorIndex(), P);
|
|
}
|
|
|
|
/// SplitCriticalEdge - If the edge from *PI to BB is not critical, return
|
|
/// false. Otherwise, split all edges between the two blocks and return true.
|
|
/// This updates all of the same analyses as the other SplitCriticalEdge
|
|
/// function.
|
|
inline bool SplitCriticalEdge(BasicBlock *Succ, pred_iterator PI, Pass *P = 0) {
|
|
bool MadeChange = false;
|
|
TerminatorInst *TI = (*PI)->getTerminator();
|
|
for (unsigned i = 0, e = TI->getNumSuccessors(); i != e; ++i)
|
|
if (TI->getSuccessor(i) == Succ)
|
|
MadeChange |= SplitCriticalEdge(TI, i, P);
|
|
return MadeChange;
|
|
}
|
|
|
|
inline bool SplitCriticalEdge(BasicBlock *Src, BasicBlock *Dst, Pass *P = 0) {
|
|
TerminatorInst *TI = Src->getTerminator();
|
|
for (unsigned i = 0, e = TI->getNumSuccessors(); ; ++i)
|
|
if (TI->getSuccessor(i) == Dst)
|
|
return SplitCriticalEdge(TI, i, P);
|
|
}
|
|
} // End llvm namespace
|
|
|
|
#endif
|