Hi, Le 21 mars 2025 04:12:14 GMT+02:00, daichengrong <daichengr...@iscas.ac.cn> a écrit : > >在 2025/3/20 19:17:21, Rémi Denis-Courmont : >> Hi, >> >> Le 20 mars 2025 11:27:39 GMT+02:00, daichengrong <daichengr...@iscas.ac.cn> >> a écrit : >>>>> 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 so what? > >When running tests/checkasm, if the operating system has RVV support disabled, >the program reports illegal instructions and the test crashes.
No, it does not. We even test this multiple times a day in FATE. > >Linux localhost.localdomain 6.13.0 #1 SMP Tue Mar 4 09:23:35 CST 2025 riscv64 >riscv64 riscv64 GNU/Linux > >[root@localhost checkasm]# echo 0 > /proc/sys/abi/riscv_v_default_allow If you use that option, you are responsible for ensuring that libc will re-enable vectors using prctl() before running any programme or library with vector code. You just shot yourself in the foot. _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
