Re: [Iverilog-devel] vec4-stack merge

[Martin W. <mai...@ma...>]

I'm running in a 64-bit environment. It looks like merge problems - for 
example the pr3366217b/c/g failures seem to be because some of your 
enumeration fixes have been lost. I can sort this out if necessary, but will 
wait to hear from Steve.

Cary R. wrote:
> 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:
>> -----BEGIN PGP SIGNED MESSAGE-----
>> Hash: SHA1
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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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