Marcin Kościelnicki 00fba62711 json: remove the 32-bit parameter special case ... 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.		2020-02-01 16:16:26 +01:00
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Makefile.inc	Added JSON backend	2015-03-02 23:30:58 +01:00
json.cc	json: remove the 32-bit parameter special case	2020-02-01 16:16:26 +01:00