Re: [Iverilog-devel] VVP Performance boots

[Stephen W. <st...@ic...>]

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Cary R. wrote:
| --- On Mon, 4/21/08, Stephen Williams <st...@ic...> wrote:
|
|> I've pushed into GIT changes to the vvp_vector4_t class
|> that
|> rework how the bits of bit4 values are stored in the
|> vector. This
|> change is based on ideas from Cary. The result is a
|> *significant*
|> boost in performance for simulations heavy with arithmetic.
|> The
|> multiple_large test is something like 20% faster. So we may
|> want
|> to be on the lookout for similar opportunities. We are
|> still in
|> the need of performance improvement on run time.
|
| I just run the test suite on my RHEL 4 32 bit machine and this patch
causes an infinite loop in vvp for xnor_test and gives incorrect results
for writememh2, writememb1, writemem2 and scanmem3 (from the VPI tests).
|
| It appears that the writemem* work files are being created correctly.
The scanmem3 file looks to be z vs x differences.


Huh, they work for me on both PowerPC (Mac OS X) and AMD64 (Linux).

- --
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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