diff options
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/Analysis/BranchProbabilityInfo.cpp | 23 |
1 files changed, 8 insertions, 15 deletions
diff --git a/llvm/lib/Analysis/BranchProbabilityInfo.cpp b/llvm/lib/Analysis/BranchProbabilityInfo.cpp index 0396f99f120..258fe54bee7 100644 --- a/llvm/lib/Analysis/BranchProbabilityInfo.cpp +++ b/llvm/lib/Analysis/BranchProbabilityInfo.cpp @@ -216,8 +216,6 @@ bool BranchProbabilityInfo::calcPointerHeuristics(BasicBlock *BB) { // Calculate Edge Weights using "Loop Branch Heuristics". Predict backedges // as taken, exiting edges as not-taken. bool BranchProbabilityInfo::calcLoopBranchHeuristics(BasicBlock *BB) { - uint32_t numSuccs = BB->getTerminator()->getNumSuccessors(); - Loop *L = LI->getLoopFor(BB); if (!L) return false; @@ -226,17 +224,13 @@ bool BranchProbabilityInfo::calcLoopBranchHeuristics(BasicBlock *BB) { SmallPtrSet<BasicBlock *, 8> ExitingEdges; SmallPtrSet<BasicBlock *, 8> InEdges; // Edges from header to the loop. - bool isHeader = BB == L->getHeader(); - for (succ_iterator I = succ_begin(BB), E = succ_end(BB); I != E; ++I) { - BasicBlock *Succ = *I; - Loop *SuccL = LI->getLoopFor(Succ); - if (SuccL != L) - ExitingEdges.insert(Succ); - else if (Succ == L->getHeader()) - BackEdges.insert(Succ); - else if (isHeader) - InEdges.insert(Succ); + if (!L->contains(*I)) + ExitingEdges.insert(*I); + else if (L->getHeader() == *I) + BackEdges.insert(*I); + else + InEdges.insert(*I); } if (uint32_t numBackEdges = BackEdges.size()) { @@ -263,9 +257,8 @@ bool BranchProbabilityInfo::calcLoopBranchHeuristics(BasicBlock *BB) { } } - uint32_t numExitingEdges = ExitingEdges.size(); - if (uint32_t numNonExitingEdges = numSuccs - numExitingEdges) { - uint32_t exitWeight = LBH_NONTAKEN_WEIGHT / numNonExitingEdges; + if (uint32_t numExitingEdges = ExitingEdges.size()) { + uint32_t exitWeight = LBH_NONTAKEN_WEIGHT / numExitingEdges; if (exitWeight < MIN_WEIGHT) exitWeight = MIN_WEIGHT; |
