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/BasicBlockUtils.cpp b/llvm/lib/Transforms/Utils/BasicBlockUtils.cpp
index 602e8ba..983f025 100644
--- a/llvm/lib/Transforms/Utils/BasicBlockUtils.cpp
+++ b/llvm/lib/Transforms/Utils/BasicBlockUtils.cpp
@@ -265,6 +265,18 @@
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