12/03/2001 08:56:38, "C. W. Wright (1698)" <[EMAIL PROTECTED]> wrote:
>I've been using the SIMD/mmx registers and instructions without a problem
>on both the Athlon, the Intel-Pro-III. It may be kind of nice that the
>kernel and gcc doesn't know about the registers and instructions in
>the P4 yet.
I agree with you for MMX !! ( I use it ... )
But I speak about SIMD with XMM0 -> XMM7 registers which are 128 bits registers ! (
quad float packet )
These registers exist since PIII, and I can't use them .... because the kernel need to
modify the stack size for task switching,
and modify a bit in CR0 in order to allow the usage of SIMD by the cpu.
So the compatibility problem is older than P4 ...
But with AMD, you get an advantage with 3Dnow instructions !! ( it does not exist
under intel unless you find a patch for kernel to allow simd instructions ...;)
Chris.
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Real-time image processing
RTAI/RTlinux
maf-roda
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