[m-rev.] For review: Improvments to Stack Segments code.

[Julien Fischer]

On Thu, 24 Feb 2011, Julien Fischer wrote:

> Ok, I've tested G12 with the grade asm_fast.gc.stseg.trseg**,
> asm_fast.gc.trseg and hlc.gc.trseg and everything seems fine.
>
> Timings for the large variant of the G12/FD test suite are as follows:
>
> Grade				Old			New
> -----				---			---
> hlc.gc.trseg			105s			106s
> asm_fast.gc.trseg		128s			128s
> asm_fast.gc.stseg.trseg		133s			135s
>
> In short, there's no significant performance difference with this
> change.  (In passing, I would note that the gap between the performance
> of asm_fast.gc.trseg and hlc.gc.trseg versions of the G12/FD solver
> seems have widened.)
>
> I'll run further tests in a couple of other trailing grades, but I
> expect they won't show anything up either.

hlc.par.gc.trseg is is broken, the `bounds_inconsistent' test
with parameter 10000000, appears to go into a loop (possibly it
deadlocks?)

Julien.
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