[squeak-dev] The Trunk: Kernel-eem.885.mcz

Bert Freudenberg bert at freudenbergs.de
Thu Nov 20 13:47:55 UTC 2014

On 20.11.2014, at 03:08, David T. Lewis <lewis at mail.msen.com> wrote:

> On Wed, Nov 19, 2014 at 11:33:41PM +0000, commits at source.squeak.org wrote:
>> Eliot Miranda uploaded a new version of Kernel to project The Trunk:
>> http://source.squeak.org/trunk/Kernel-eem.885.mcz
>> ==================== Summary ====================
>> Name: Kernel-eem.885
>> Author: eem
>> Time: 19 November 2014, 3:33:32.003 pm
>> UUID: 6e239e5b-b957-4ff6-a3ce-bb3ee10cf826
>> Ancestors: Kernel-eem.884
>> Steal the Smalltalk-80 V2 definition of SmallInteger>>
>> digitAt: which doesn't assume max digit length.
> Interesting. The 32-bit optimization in digitAt: has been in Squeak since
> 1999, but it seems to have very little performance benefit on my system
> (measured on a somewhat random combination of AMD Ubuntu with 64 bit image
> and interpreter VM to prevent any misleading optimizations).
> Assuming that the 1999 optimizations were important for at least some
> platforms, I tried to adapt that method to accommodate 32 and 64 bit integer
> sizes. The result was slower than any of the previous implementations.
> So +1 for adopting the unoptimized Smalltalk-80 V2 definition of SmallInteger>>digitAt:

Yes, although IMHO the recursive call to digitAt: is trying to be too clever. I don't see why it couldn't use a bitShift: and bitAnd: directly.

- Bert -

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