On 6 January 2012 08:22, Walter Bright
<newshound2@digitalmars.com> wrote:
On 1/5/2012 7:42 PM, Manu wrote:
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
Hehe, true, but not insurmountable. Scheduling of parameter pops before you perform the alignment may solve that straight up, or else don't align esp its self; store the vector to the stack through some other aligned reg copied from esp...
I just wrote some test functions using __m128 in VisualC, it seems to do something in between the simplicity of my initial suggestion, and my refined ideas one above :)
If you have VisualC, check out what it does, it's very simple, looks pretty good, and I'm sure it's optimal (MS have enough R&D money to assure this)
I can paste some disassemblies if you don't have VC...