hi,
The reply email was mistakenly classified as spam, resulting in not
being seen in time.
Late reply.
在 2025/3/15 12:03:09, Rémi Denis-Courmont :
Hi,
Le 14 mars 2025 17:32:57 GMT+07:00, daichengr...@iscas.ac.cn a écrit :
From: daichengrong <daichengr...@iscas.ac.cn>
Availability of RVV and ZVBB should be determined with dl_hwcap.
No. That's completely superfluous since we already check for kernel support
with hwprobe().
No. If the operating system does not enable dl_hwcap support for rvv, an
illegal instruction exception will be reported , even if the hardware
and kernel support RVV.
And we can't check for Zb* and Zv* with hwcap anyhow.
As those extensions rely on vector registers, kernel vector support
is required to save the state of context switching.
No. Kernel context switching is already ascertained.
No. The kernel will not save and restore vector registers if the program
does not use vector instructions.
And we don't care about libc context support, since vectors are clobbered by
function calls, e.g. for long jumps or ucontext.
I'm confused about this
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