When use LA464(3A5000 pc), LLVM18 and kernel(which not supports lsx/lasx),
it will get a illegal instruction error. LA464 will return LA464 and
LA664 will return a generic when calling getHostCPUName(). Return LA464
name will add all feature(+f,+d,+lsx,+lasx,lvz) by default and generate
vector instruction, generic will add null. Hence we use util_get_cpu_caps
to judge if kernel supports lsx/lasx or not.
Set lsx and lasx by util_get_cpu_caps. Only LLVM 18 on loongarch
supports lsx and lasx completely. LLVM 16 isn't supported and
LLVM 17's LSX support is incomplete.
Signed-off-by: Jiale Zhao <zhaojiale@loongson.cn>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/30220>
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