diff options
Diffstat (limited to 'llvm/lib/CodeGen/WinEHPrepare.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/WinEHPrepare.cpp | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/WinEHPrepare.cpp b/llvm/lib/CodeGen/WinEHPrepare.cpp index afe26ff8224..4b0ce21111b 100644 --- a/llvm/lib/CodeGen/WinEHPrepare.cpp +++ b/llvm/lib/CodeGen/WinEHPrepare.cpp @@ -433,6 +433,10 @@ bool WinEHPrepare::prepareExceptionHandlers( Invoke->setUnwindDest(NewLPadBB); } + // If anyone is still using the old landingpad value, just give them undef + // instead. The eh pointer and selector values are not real. + LPad->replaceAllUsesWith(UndefValue::get(LPad->getType())); + // Replace the mapping of any nested landing pad that previously mapped // to this landing pad with a referenced to the cloned version. for (auto &LPadPair : NestedLPtoOriginalLP) { @@ -636,6 +640,11 @@ void WinEHPrepare::promoteLandingPadValues(LandingPadInst *LPad) { PromoteMemToReg(EHAllocas, *DT); EHAllocas.clear(); } + + // After promotion, some extracts may be trivially dead. Remove them. + SmallVector<Value *, 4> Users(LPad->user_begin(), LPad->user_end()); + for (auto *U : Users) + RecursivelyDeleteTriviallyDeadInstructions(U); } void WinEHPrepare::completeNestedLandingPad(Function *ParentFn, |
