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Move isCriticalEdge & SplitCritical into this file. While we're at it, change

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the interface to SplitCriticalEdge so that it splits an edge if it is critical,
otherwise just returns false and noops if not.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@9852 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2003-11-10 04:10:27 +00:00
parent 4a05ba0ab5
commit d9c5c5e12f
1 changed files with 16 additions and 0 deletions
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16
include/llvm/Transforms/Utils/BasicBlockUtils.h
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@ -19,6 +19,7 @@
#include "llvm/BasicBlock.h"
class Instruction;
class Pass;
// ReplaceInstWithValue - Replace all uses of an instruction (specified by BI)
// with a value, then remove and delete the original instruction.
@ -48,4 +49,19 @@ void ReplaceInstWithInst(Instruction *From, Instruction *To);
//
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);
#endif