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SLPVectorizer incorrectly replaces add nsw undef with add poison. However, add nsw undef, 0 is undef, not poison, so the transformation is not correct.
Example:
SLPVectorizer incorrectly replaces
add nsw undef
withadd poison
. However,add nsw undef, 0
is undef, not poison, so the transformation is not correct.Example:
cc @regehr @cilkplus @davemgreen @RKSimon
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