In <Pine.LNX.3.91.1000413202029.119C-100000@golem> Volker W. Elling (elling@baer.rwth-aachen.de) wrote:
> [please respond via mail too]
> Hi,
> I am trying to exploit the floating-point vector operations of Intel Pentium
> III. "as" has support for the corresponding machine instructions, but I
> keep getting SIGILL when trying "movups". (Yes, I checked for SIMD support
> via "cpuid"). Does Linux save the xmm* registers during
> context switches, set the proper flags in CR0/CR4 and so on ?
Not, unless you recompiled kernel with PIII support (you'll need appropriate
patch; it's included, for example, in kernel from RedHat 6.2).
> Is somebody working on these matters ?
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