Re: [Iverilog-devel] vec4-stack merge

[Cary R. <cy...@ya...>]

Martin,
I haven't synced to the new code, and probably won't for a couple days, but is this a 32-bit vs 64-bit issue? Most people seem to be running and testing under 64-bit, though I still have one setup that is 32-bit to check for this specific problem and I have fixed a few bugs related to that lately.
Cary 

     On Saturday, December 6, 2014 11:56 AM, Martin Whitaker <mai...@ma...> wrote:
   

 I'm seeing 6 new failures when I run the regression tests:

% grep Failed regression_report.txt
                  pr1830834: ==> Failed - output does not match gold file.
                    analog1: ==> Failed - running iverilog.
                    analog2: ==> Failed - running iverilog.
                  fileline2: ==> Failed - output does not match gold file.
                  pr3366217b: ==> Failed - CE - output does not match gold file.
                  pr3366217c: ==> Failed - CE (no error reported).
                  pr3366217g: ==> Failed - CE - output does not match gold file.
                    br_gh13a: ==> Failed - output does not match gold file.
                      br605a: ==> Failed - output does not match gold file.
                      br605b: ==> Failed - output does not match gold file.
            if_part_no_else2: ==> Failed - running iverilog.
  Total=2087, Passed=2076, Failed=11, Not Implemented=0, Expected Fail=0

Are these known issues?

Stephen Williams wrote:
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> I've gone and done it, I've merged the vec4-stack branch into
> the master branch. This is a BIG set of changes that I've been
> working on for many months now, with the idea of cleaning up
> the vvp runtime and opening up some performance optimization
> opportunities.
>
> For those who care, what I've done is rework the vvp instruction
> set for handling logic vectors. Up until now, the vvp engine
> kept a long vector of "register" space, and operations like add,
> subtract, etc. picked their operands out of that register space.
> After this merge, the register space has been converted into a
> stack of vectors. The instructions just pull operands of the
> stack, so fewer operands are needed, and there is no more picking
> operands out of a larger vector.
>
> I have taken advantage of some of the benefits, some tests should
> now run significantly faster. If you find any things that run
> slower with the new system, I'd like to know about them.
>
> The outputs in some cases are different. The Verilog standard
> has some ambiguous corners and with this merge Icarus Verilog
> may generate for you some different but still legal results,
> mostly related to vector widths. I have updated the regression
> test suite to account for most of these, but you may see some
> subtle differences in your run time results. Should still be legal,
> though, so you should be fine.
>
>
> - --
> Steve Williams                "The woods are lovely, dark and deep.
> steve at icarus.com          But I have promises to keep,
> http://www.icarus.com         and lines to code before I sleep,
> http://www.picturel.com       And lines to code before I sleep."
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