signed / unsigned representation

[dalance]

Signed / unsigned specifier is not implemented.

signed / unsigned like SV

var a: signed logic[10];
var b: unsigned logic[10];
var c: logic[10]; // signed or unsigned ?

Some problems.

• bit long
• word length is not uniformed
• omitted case may be confusable

ilogic / ulogic

This is the same as isize / usize in Rust.

var a: ilogic[10]; // signed logic in SV
var b: ulogic[10]; // unsigned logic in SV
var c: ibit  [10]; // signed bit in SV
var d: ubit  [10]; // unsigned bit in SV

This seems to be better than signed / unsigned?

[taichi-ishitani]

I think using a signed value is a special case than using a unsigned value.
Therefore, I prefer introducing the signed keyword as a type modifier like the tri keyword.

[dalance]

OK. It seems to be good that unsigned by default and signed is added only.