>>>> FYI, and you may know, but i've not tested actually,
>>>> some closed source VHDL simulators (such as Aldec Riviera-PRO) have
>>>> relax
>>>> options (e.g. integer range), IIRC.
>>>
>>> Never heard about that.  Any pointer or detail about this feature
>>> would be useful.
>>
>> e.g. Riviera-PRO has -relax option for acom/asim (these are Aldec-favor
>> commands for well-known vcom/vsim) and their detailed description and
>> examples are documented in its manual, are titled like "Relaxing LRM
>> requirements" or so.
>> unfortunately, reading this manual required to install it and use its
>> manual viewer, or sign-in to Aldec site.
>> so i'm not sure it is fair-use/legal to share this detail info in
>> public ML, sorry.
>
> Ok, but can you briefly describe how it affects integer ranges ?

for integer range w/ -relax, IIUC, the manual said,
* 32-bit literal are treated as two's complement,
  e.g. ":= 16#FFFFFFFF#" is treated as ":= -1".
* conv_integer() accepts 32-bit argument.

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