Introduce llvm::SplitAllCriticalEdges
Summary:
move the code from BreakCriticalEdges::runOnFunction()
into a separate utility function llvm::SplitAllCriticalEdges()
so that it can be used independently.
No functionality change intended.
Test Plan: check-llvm
Reviewers: nlewycky
Reviewed By: nlewycky
Subscribers: llvm-commits
Differential Revision: http://reviews.llvm.org/D6313
llvm-svn: 222288
diff --git a/llvm/lib/Transforms/Utils/BreakCriticalEdges.cpp b/llvm/lib/Transforms/Utils/BreakCriticalEdges.cpp
index 80bd516..eda22cf 100644
--- a/llvm/lib/Transforms/Utils/BreakCriticalEdges.cpp
+++ b/llvm/lib/Transforms/Utils/BreakCriticalEdges.cpp
@@ -40,7 +40,11 @@
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>();
@@ -62,24 +66,6 @@
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
//===----------------------------------------------------------------------===//