[Bug target/106586] riscv32 still broke with zba_zbb_zbc_zbs, ICE in do_SUBST in C++ code

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106586

--- Comment #8 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to jiawei from comment #7)
> I had roll back the RISC-V commit and found that this modification cause
> this building failure.
> 
> https://gcc.gnu.org/git/?p=gcc.git;a=blobdiff;f=gcc/config/riscv/riscv.h;
> h=6f7f4d3fbdcfa6c8ca03604fbe5817aad6278e2e;
> hp=5083a1c24b08233810dd3b2aa4278b3ef8a75791;
> hb=4e72ccad80d69a76d149fba59603b8173fffe8fe;
> hpb=d19b4342c19e5a7fd84888aa06ebc106438d0c46
> 
> But I am not sure what's wrong with it, any suggestions?

Yes the problem is a bit complex, the problem is representation of INT_MIN is
sign extended (always) and HOST_WIDE_INT is always 64bit.
Anyways the fix is to improve the predicate to be correct and fix the
constraints too. I am working towards that but I am doing some other cleanups
along the way to the backend so the riscv backend looks more like a modern
backend.