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verilog: fix size and signedness of array querying functions

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genrtlil.cc and simplify.cc had inconsistent and slightly broken
handling of signedness for array querying functions. These functions are
defined to return a signed result. Simplify always produced an unsigned
and genrtlil always a signed 32-bit result ignoring the context.

Includes tests for the the relvant edge cases for context dependent
conversions.
This commit is contained in:
Jannis Harder 2022-05-20 21:46:39 +02:00 • committed by Zachary Snow
parent ce24208a8b
commit 4bfaaea0d5
4 changed files with 56 additions and 3 deletions
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CHANGELOG
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@ -12,6 +12,8 @@ Yosys 0.17 .. Yosys 0.17-dev
- Fixed an issue where simplifying case statements by removing unreachable
cases could result in the wrong signedness being used for comparison with
the remaining cases
- Fixed size and signedness computation for expressions containing array
querying functions
Yosys 0.16 .. Yosys 0.17
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