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Add doc for pmgen semioptional statement, Add pmgen changes to CHANGELOG

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Signed-off-by: Clifford Wolf <clifford@clifford.at>
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Clifford Wolf 2019-08-15 23:02:37 +02:00
parent 969ab9027a
commit 016036f247
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passes/pmgen/README.md
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@ -175,6 +175,9 @@ explore the case where `mul` is set to `nullptr`. Without the `optional`
statement a match may only be assigned nullptr when one of the `if` expressions
evaluates to `false`.
The `semioptional` statement marks matches that must match if at least one
matching cell exists, but if no matching cell exists it is set to `nullptr`.
Additional code
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