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[NFCI][SimplifyCFG] simplifyUnreachable(): Use poison constant to represent the result of unreachable instrs

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Mimics similar change for InstCombine:
  ce192ced2b901be67444c481ab5ca0d731e6d982 / D104602

All these uses are in blocks that aren't reachable from function's entry,
and said blocks are removed by SimplifyCFG itself,
so we can't really test this change.
This commit is contained in:
Roman Lebedev 2021-07-02 21:57:49 +03:00
parent b9347e6b66
commit 56d41a008d
1 changed files with 1 additions and 2 deletions
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3
lib/Transforms/Utils/SimplifyCFG.cpp
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@ -4700,8 +4700,7 @@ bool SimplifyCFGOpt::simplifyUnreachable(UnreachableInst *UI) {
}
// Delete this instruction (any uses are guaranteed to be dead)
if (!BBI->use_empty())
BBI->replaceAllUsesWith(UndefValue::get(BBI->getType()));
BBI->replaceAllUsesWith(PoisonValue::get(BBI->getType()));
BBI->eraseFromParent();
Changed = true;
}