On Mer, 2004-09-22 at 22:14, Eric Anholt wrote:
2.2 kernels and kernels not properly configured for Pentium3 CPUs. So, what's the right way on a 2.4 or a 2.6 kernel to determine if an app can use SSE? What about BSD?
On FreeBSD we just use a convenient little sysctl to pull out whether there's SSE and the kernel supports it.
Ask the processor or ask the kernel (cpuid or /proc/cpuinfo). All modern kernels support SSE so the exception case should only occur for 2.2 (ie unsupported).
The folks on #freedesktop suggested parsing cpuinfo, and I wrote some simple code to do that. Are you saying that, if CPUID returns the SSE bit set and we're on a 2.4 or later kernel, we're good to go? That would make me very happy because we already test the CPUID bit, and DRI isn't supported on 2.2. :)
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