SIMD support...

Manu turkeyman at gmail.com
Thu Jan 5 19:46:14 PST 2012


On 6 January 2012 05:42, Manu <turkeyman at gmail.com> wrote:

> On 6 January 2012 05:22, Walter Bright <newshound2 at digitalmars.com> wrote:
>
>> On 1/5/2012 6:25 PM, Manu wrote:
>>
>>> Are you talking about for parameter passing, or for local variable
>>> assignment on
>>> the stack?
>>> For parameter passing, I understand the x32 problems with aligning the
>>> arguments
>>> (I think it's possible to work around though), but there should be no
>>> problem
>>> with aligning the stack for allocating local variables.
>>>
>>
>> Aligning the stack. Before I say anything, I want to hear your suggestion
>> for how to do it efficiently.
>>
>
> Perhaps I misunderstand, I can't see the problem?
> In the function preamble, you just align it... something like:
>   mov reg, esp ; take a backup of the stack pointer
>   and esp, -16 ; align it
>
> ... function
>
>   mov esp, reg ; restore the stack pointer
>   ret 0
>

That said, most of the time values used in smaller functions will only ever
exist in regs, and won't ever be written to the stack... in this case,
there's no problem.
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