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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
2 changed files with 4 additions and 0 deletions
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1
CHANGELOG
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@ -19,6 +19,7 @@ Yosys 0.9 .. Yosys 0.9-dev
- Added automatic gzip compression (based on filename extension) for backends - Added automatic gzip compression (based on filename extension) for backends
- Improve attribute and parameter encoding in JSON to avoid ambiguities between - Improve attribute and parameter encoding in JSON to avoid ambiguities between
bit vectors and strings containing [01xz]* bit vectors and strings containing [01xz]*
- Improvements in pmgen: subpattern and recursive matches
Yosys 0.8 .. Yosys 0.8-dev Yosys 0.8 .. Yosys 0.8-dev
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3
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 statement a match may only be assigned nullptr when one of the `if` expressions
evaluates to `false`. 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 Additional code
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