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lifteime
2019 Sep 24
2
An issue with "lifetime.start" and storing "undef"
...he solution 1 because the semantics of
lifetime.start defined in "lib/CodeGen/StackColoring.cpp" is a bit
confusing. It says:
// L2) on a `lifetime.start`, a stack slot is marked as *in-scope* and
// the stack slot is overwritten with `undef`.
As it mentioned, "on" a 'lifteime.start', we are unsure about if it is
meant to be before or after it. Will there be any issue in later passes, if
we have an "undef" value "store" after lifetime.start.
Regards,
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Raghesh Aloor
AMD India Pvt. Ltd.
Bengaluru.
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