Re: Increasing minimum 'i386' processor
2011/11/23 Matthias Klose <email@example.com>:
> On 11/19/2011 11:42 PM, Ben Hutchings wrote:
>> (Later it should be increased
>> further, and eventually i386 should be reduced to a partial architecture
>> that may be installed on amd64 systems.) This would allow the use of
>> optimisations and new instructions throughout userland that improve
>> performance for the vast majority of users.
> could you give numbers what kind of improvements you would expect? The biggest
> burden for i386 is the register pressure, which you won't fix with targeting a
> newer processor. The better approach would be a new port, the x32 architecture;
> I don't know if anybody did look into building a distribution for this
> architecture yet. The next thing could be to default to sse2 math instead of
> x87 (didn't look if this is already the default for x32).
FWIW, Yocto has attempted to build an image for x32:
Yes, x32 defaults to SSE and improvements expected 7-10% on integer
math over ia32 (5-8% over intel64) and 5-11% on fp math over ia32.
Héctor Orón -.. . -... .. .- -. -.. . ...- . .-.. --- .--. . .-.