[libre-riscv-dev] spike-sv non-default element widths

[Luke Kenneth Casson Leighton]

---
crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68

On Fri, Oct 19, 2018 at 9:20 PM Luke Kenneth Casson Leighton
<lkcl at lkcl.net> wrote:
>
> ---
> crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68
>
> On Fri, Oct 19, 2018 at 12:01 PM Luke Kenneth Casson Leighton
> <lkcl at lkcl.net> wrote:
> >
> > yippee!  got it!  finally an sv_reg_t and sv_sreg_t class which do the
> > right thing, and pass all the unit tests.
>
>  *sigh* passed the unit tests, a hello world with more than around 18
> characters, "hello hello hello\n", results in corrupted output.
>
> #include <stdio.h>
>
> int main(int argc, char *argv[])
> {
>     printf("hello  hello hello\n");
> }
>
> might need your help here jacob.

 damn.  ok.  so i partially tracked it down, by not setting the
elwidth parameter in the new sv_reg_t class.  the two member elements
are uint64_t reg and uint8_t elwidth.  by *not* setting elwidth, there
is no stack / memory corruption.

 what that tells me is that somewhere, an operator-overload / typecast
is going haywire, and i've no idea where.

 any suggestions on how to track this down?

l.