diff options
| author | Jun Ma <JunMa@linux.alibaba.com> | 2021-09-28 09:44:00 +0800 |
|---|---|---|
| committer | Jun Ma <JunMa@linux.alibaba.com> | 2021-11-01 15:31:59 +0800 |
| commit | c93f93b2e3f28997f794265089fb8138dd5b5f13 (patch) | |
| tree | 01d009472a2b29440ce449f3dd70924604d95baa /llvm/lib/Transforms/Utils/Local.cpp | |
| parent | b4fb42300e39c99ac5bb9d02b304b713fabdec4d (diff) | |
| download | llvm-c93f93b2e3f28997f794265089fb8138dd5b5f13.zip llvm-c93f93b2e3f28997f794265089fb8138dd5b5f13.tar.gz llvm-c93f93b2e3f28997f794265089fb8138dd5b5f13.tar.bz2 | |
Revert "Revert "Recommit "Revert "[CVP] processSwitch: Remove default case when switch cover all possible values.""""
This reverts commit 3a998c06a8e93989319238e12b56a731198cc1c2.
Diffstat (limited to 'llvm/lib/Transforms/Utils/Local.cpp')
| -rw-r--r-- | llvm/lib/Transforms/Utils/Local.cpp | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/llvm/lib/Transforms/Utils/Local.cpp b/llvm/lib/Transforms/Utils/Local.cpp index 3e36f49..74ab37f 100644 --- a/llvm/lib/Transforms/Utils/Local.cpp +++ b/llvm/lib/Transforms/Utils/Local.cpp @@ -2190,6 +2190,26 @@ void llvm::changeToCall(InvokeInst *II, DomTreeUpdater *DTU) { DTU->applyUpdates({{DominatorTree::Delete, BB, UnwindDestBB}}); } +void llvm::createUnreachableSwitchDefault(SwitchInst *Switch, + DomTreeUpdater *DTU) { + LLVM_DEBUG(dbgs() << "SimplifyCFG: switch default is dead.\n"); + auto *BB = Switch->getParent(); + auto *OrigDefaultBlock = Switch->getDefaultDest(); + OrigDefaultBlock->removePredecessor(BB); + BasicBlock *NewDefaultBlock = BasicBlock::Create( + BB->getContext(), BB->getName() + ".unreachabledefault", BB->getParent(), + OrigDefaultBlock); + new UnreachableInst(Switch->getContext(), NewDefaultBlock); + Switch->setDefaultDest(&*NewDefaultBlock); + if (DTU) { + SmallVector<DominatorTree::UpdateType, 2> Updates; + Updates.push_back({DominatorTree::Insert, BB, &*NewDefaultBlock}); + if (!is_contained(successors(BB), OrigDefaultBlock)) + Updates.push_back({DominatorTree::Delete, BB, &*OrigDefaultBlock}); + DTU->applyUpdates(Updates); + } +} + BasicBlock *llvm::changeToInvokeAndSplitBasicBlock(CallInst *CI, BasicBlock *UnwindEdge, DomTreeUpdater *DTU) { |