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As per suggestion made in https://github.com/YosysHQ/yosys/pull/1987, now:
RTLIL::wire holds an is_signed field.
This is exported in JSON backend
This is exported via dump_rtlil command
This is read in via ilang_parser
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Fixes #1823.
This will allow nextpnr to reuse the default value information already
present in yosys cells_sim.v and avoid duplicating (and probably
desyncing) this information.
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Fixes #1693.
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This increases compatibility with certain older parsers in some cases
that worked before commit 15fae357 but do not work with the current
compat-int mode
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Before, the rules for encoding parameters in JSON were as follows:
- if the parameter is not a string:
- if it is exactly 32 bits long and there are no z or x bits, emit it
as an int
- otherwise, emit it as a string made of 0/1/x/z characters
- if the parameter is a string:
- if it contains only 0/1/x/z characters, append a space at the end
to distinguish it from a non-string
- otherwise, emit it directly
However, this caused a problem in the json11 parser used in nextpnr:
yosys emits unsigned ints, and nextpnr parses them as signed, using
the value of INT_MIN for values that overflow the signed int range.
This caused destruction of LUT5 initialization values. Since both
nextpnr and yosys parser can also accept 32-bit parameters in the
same encoding as other widths, let's just remove that special case.
The old behavior is still left behind a `-compat-int` flag, in case
someone relies on it.
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Signed-off-by: Clifford Wolf <clifford@clifford.at>
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Signed-off-by: Clifford Wolf <clifford@clifford.at>
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Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
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Consistent use of 'override' for virtual methods in derived classes.
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o Not all derived methods were marked 'override', but it is a great
feature of C++11 that we should make use of.
o While at it: touched header files got a -*- c++ -*- for emacs to
provide support for that language.
o use YS_OVERRIDE for all override keywords (though we should probably
use the plain keyword going forward now that C++11 is established)
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Signed-off-by: Clifford Wolf <clifford@clifford.at>
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"speciefied" -> "specified"
"unkown" -> "unknown"
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Smaller this time
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