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| author | Richard Osborne <richard@xmos.com> | 2012-07-20 10:36:17 +0000 |
|---|---|---|
| committer | Richard Osborne <richard@xmos.com> | 2012-07-20 10:36:17 +0000 |
| commit | dd2fb6c10b30e70ab8f910e21e583be3e90bb88c (patch) | |
| tree | 1e7e77fc74349ad773b03517f4db64b33831cb53 /lib/Transforms | |
| parent | f7b08226eb44458f6f38cbeaca527028803c725a (diff) | |
| download | external_llvm-dd2fb6c10b30e70ab8f910e21e583be3e90bb88c.zip external_llvm-dd2fb6c10b30e70ab8f910e21e583be3e90bb88c.tar.gz external_llvm-dd2fb6c10b30e70ab8f910e21e583be3e90bb88c.tar.bz2 | |
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
Diffstat (limited to 'lib/Transforms')
| -rw-r--r-- | lib/Transforms/Scalar/JumpThreading.cpp | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/Transforms/Scalar/JumpThreading.cpp b/lib/Transforms/Scalar/JumpThreading.cpp index 429b61b..6b8430f 100644 --- a/lib/Transforms/Scalar/JumpThreading.cpp +++ b/lib/Transforms/Scalar/JumpThreading.cpp @@ -670,6 +670,8 @@ bool JumpThreading::ProcessBlock(BasicBlock *BB) { } else if (SwitchInst *SI = dyn_cast<SwitchInst>(Terminator)) { Condition = SI->getCondition(); } else if (IndirectBrInst *IB = dyn_cast<IndirectBrInst>(Terminator)) { + // Can't thread indirect branch with no successors. + if (IB->getNumSuccessors() == 0) return false; Condition = IB->getAddress()->stripPointerCasts(); Preference = WantBlockAddress; } else { |