verilator
`VerilatedVpiPutHolder` kinda chunky
Inertial writes can queue up a number of VerilatedVpiPutHolder objects. Each of these objects is 160 bytes on a 64-bit Linux machine. It might be worthwhile to find a way to reduce the size of these.
Ideally we only need a reference to the object being assigned and the value to be assigned (should be a tagged union). This could be as small as 48 bytes on such a system (pointer to handle: 8 bytes, union for value: 32 bytes (string is 32), tag: 8 bytes (align is 8)).
Probably the easiest thing would be separate the common case of only needing m_value versus needing a string/vector into two separate classes.
Pull request to shrink this welcome.
Not sure if putting these in separate classes is the best play. They become heap allocated, dynamically dispatched, and only 32-56 bytes smaller. Most of the overhead comes from VerilatedVpioVar as there are 80 bytes of unused fields in that object.