[Bug target/65694] [5 Regression] ICE (in decompose, at rtl.h:2007) on arm-linux-gnueabihf

[ktkachov at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65694

--- Comment #6 from ktkachov at gcc dot gnu.org ---
(In reply to ktkachov from comment #5)
> (In reply to ktkachov from comment #4)
> > This looks similar to PR 64600.
> > The problem seems to be arm_canonicalize_comparison that
> > canonicalizes a comparison with 2147483647 (0x7fffffff)
> > into a comparison with that +1, that is 0x80000000 without properly
> > sign-extending it into 0xffffffff80000000 (which would make it -2147483648).
> 
> That's not right logic, need to think a bit harder on what to do here...

err... Ignore this. I think doing the sign-extend here is the right thing to
do.
All these numbers close to INT_MIN/MAX are very fiddly :(