[Bug target/123870] [riscv64] ICE on vzext_vf2 and xtheadvector

[rdapp at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123870

--- Comment #19 from Robin Dapp <rdapp at gcc dot gnu.org> ---
(In reply to Ilya Kurdyukov from comment #18)
> I tried to find out what exactly in -O2 is causing the problem.
> 
> It seems to be in instruction scheduling:
> 
> -O2 : wrong result
> -O1 : correct
> 
> -O1 -fschedule-insns : wrong result
> -O2 -fno-schedule-insns : correct
> -O3 -fno-schedule-insns : correct

Interesting, that's a good find and maybe can help me debug even without
hardware.

Would you mind trying --param=riscv-vsetvl-strategy=simple?