回复：[RISC-V] [tech-vector-ext] Configuring qemu for Vector Extension
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The vector 0.7.1 version has been implemented in T-Head Xuantie c910v CPU and AllWinner D1 Soc. If that's what you want or If you want to use the QEMU upstream currently, I can give you some advice.
The toolchian binary you can download from the link:
You can compile your program with -march rv64gcv -mabi=lp64dv.
The programming intrinsic is very similiar to the upstrem gcc and please see the attachment.