Handling negative numbers

[sa2257]

I'm getting errors when using negative numbers.

let a = -1;

gives me

[Parsing error] [15.22] failure: '(' expected but '-' found

with brackets it gives me

[Parsing error] [15.23] failure: Base Failure

when used like this

let a = (0-1);

it generates cpp, but with one bit

ap_int<1> MISMATCH_SCORE = (0 - 1);

https://github.com/cucapra/fuse-benchmarks/issues/66

[sampsyo]

Curiously, parenthesizing the negative yields a less scrutable error message:

[Parsing error] [1.10] failure: Base Failure

let a = (-1);
         ^

Anyway, as for your current workaround, how about giving those explicit types?

let MISMATCH_SCORE: bit<2> = (0-1);
let GAP_SCORE: bit<2>      = (0-1);

[sa2257]

Curiously, parenthesizing the negative yields a less scrutable error message:

[Parsing error] [1.10] failure: Base Failure

let a = (-1);
         ^

Anyway, as for your current workaround, how about giving those explicit types?

let MISMATCH_SCORE: bit<2> = (0-1);
let GAP_SCORE: bit<2>      = (0-1);

Oh yes! 🤦‍♂️ That's way better than manually changing the cpp. https://github.com/cucapra/fuse-benchmarks/commit/2f0e2bd50f238237af82da3c87287cccf651ac04