[openbeos] Re: app_server: MMX/SSE help wanted
- From: Christian Packmann <Christian.Packmann@xxxxxx>
- To: openbeos@xxxxxxxxxxxxx
- Date: Wed, 11 Aug 2004 09:01:01 +0200
On 2004-08-10 20:40:45 [+0200], Axel Dörfler wrote:
> What we could also do is to add another bitmap flag to force an ideal
> alignment for the current CPU.
This would be perfect.
One other thing: will the kernel have some kind of CPU feature
identification? A quick grep on the headers didn't turn up any relevant hit
on MMX (only B_CPU_INTEL_PENTIUM_MMX*). A function returning the CPUs
features would be very useful, to write code like this:
uint32 cpuFlags = get_cpu_capabilities();
if(cpuFlags & CPU_HAS_SSE) {
...
} else if(cpuFlags & CPU_HAS_MMX) {
...
} else {
...
}
I already do it this way, using my own CPU ID routine; but this should
really be a kernel function. Of course that routine should also identify
all other relevant features, not only SIMD instruction sets. I can write
that routine if you want, I imagine the kernel team has other things to
do...
Bye,
Chris
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