Re: [libre-riscv-dev] daily kan-ban update, 22jul2020

[Luke Kenneth Casson Leighton <lkcl@lkcl.net>]

On Thursday, July 23, 2020, Jacob Lifshay <programmerjake@gmail.com> wrote:

> On Thu, Jul 23, 2020, 02:40 Luke Kenneth Casson Leighton <lkcl@lkcl.net>
> wrote:
>
> > On Thursday, July 23, 2020, Luke Kenneth Casson Leighton <lkcl@lkcl.net>
> > wrote:
> >
> > >
> > >
> > > On Thursday, July 23, 2020, Jacob Lifshay <programmerjake@gmail.com>
> > > wrote:
> > >
> > >>
> > >> SimOnly, I discovered that for test_divwuo_regression_1 (0xc4e32b68 /
> > >> 0x32867d69), the pipeline (SimOnly) is giving the correct results
> > >> (rt=0x3), it's the ISA simulator code that's messed up
> > >> (rt=0xFFFFFFFF).
> > >
> > >
> > > please raise a bugreport for it.
> > >
> >
> > saw it, thank you for doing that.
> >
> > these look great btw
> >
> >
> >
> > https://git.libre-soc.org/?p=soc.git;a=commitdiff;h=
> 78096b62db0345846cca70ab2f75f9c3519006c4
>
>
> Thanks! I used the same list of test values as in
> power-instruction-analyzer.


i wondered if, like in the ieee754fp tests, if some random values could be
added, too.

also, some exponentially scaled numbers.

two random uniform distributed numbers for div, the answer pretty much
averages out to 1 which is of course a fairly useless test.

by doing this you get a much better distribution suited to testing divide
full range:

x = random(1,32)
return random(0,1<<x)

l.




> Jacob
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