}
}
+// SplitAllCriticalEdges - Loop over all of the edges in the CFG,
+// breaking critical edges as they are found. Pass P must not be NULL.
+// Returns the number of broken edges.
+unsigned SplitAllCriticalEdges(Function &F, Pass *P);
+
/// SplitEdge - Split the edge connecting specified block. Pass P must
/// not be NULL.
BasicBlock *SplitEdge(BasicBlock *From, BasicBlock *To, Pass *P);
return SplitBlock(BB, BB->getTerminator(), P);
}
+unsigned llvm::SplitAllCriticalEdges(Function &F, Pass *P) {
+ unsigned NumBroken = 0;
+ for (Function::iterator I = F.begin(), E = F.end(); I != E; ++I) {
+ TerminatorInst *TI = I->getTerminator();
+ if (TI->getNumSuccessors() > 1 && !isa<IndirectBrInst>(TI))
+ for (unsigned i = 0, e = TI->getNumSuccessors(); i != e; ++i)
+ if (SplitCriticalEdge(TI, i, P))
+ ++NumBroken;
+ }
+ return NumBroken;
+}
+
/// SplitBlock - Split the specified block at the specified instruction - every
/// thing before SplitPt stays in Old and everything starting with SplitPt moves
/// to a new block. The two blocks are joined by an unconditional branch and
initializeBreakCriticalEdgesPass(*PassRegistry::getPassRegistry());
}
- bool runOnFunction(Function &F) override;
+ bool runOnFunction(Function &F) override {
+ unsigned N = SplitAllCriticalEdges(F, this);
+ NumBroken += N;
+ return N > 0;
+ }
void getAnalysisUsage(AnalysisUsage &AU) const override {
AU.addPreserved<DominatorTreeWrapperPass>();
return new BreakCriticalEdges();
}
-// runOnFunction - Loop over all of the edges in the CFG, breaking critical
-// edges as they are found.
-//
-bool BreakCriticalEdges::runOnFunction(Function &F) {
- bool Changed = false;
- for (Function::iterator I = F.begin(), E = F.end(); I != E; ++I) {
- TerminatorInst *TI = I->getTerminator();
- if (TI->getNumSuccessors() > 1 && !isa<IndirectBrInst>(TI))
- for (unsigned i = 0, e = TI->getNumSuccessors(); i != e; ++i)
- if (SplitCriticalEdge(TI, i, this)) {
- ++NumBroken;
- Changed = true;
- }
- }
-
- return Changed;
-}
-
//===----------------------------------------------------------------------===//
// Implementation of the external critical edge manipulation functions
//===----------------------------------------------------------------------===//