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Fix assertion in jump threading (PR13405).
GetBestDestForJumpOnUndef() assumes there is at least 1 successor, which isn't true if the block ends in an indirect branch with no successors. Fix this by bailing out earlier in this case. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160546 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -670,6 +670,8 @@ bool JumpThreading::ProcessBlock(BasicBlock *BB) {
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} else if (SwitchInst *SI = dyn_cast<SwitchInst>(Terminator)) {
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Condition = SI->getCondition();
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} else if (IndirectBrInst *IB = dyn_cast<IndirectBrInst>(Terminator)) {
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// Can't thread indirect branch with no successors.
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if (IB->getNumSuccessors() == 0) return false;
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Condition = IB->getAddress()->stripPointerCasts();
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Preference = WantBlockAddress;
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} else {
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@ -0,0 +1,8 @@
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; RUN: opt < %s -jump-threading
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; PR 13405
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; Just check that it doesn't crash / assert
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define i32 @f() nounwind {
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entry:
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indirectbr i8* undef, []
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}
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