[Bug target/89506] [7/8/9 Regression] ICE: in decompose, at rtl.h:2266 with -Og -g

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89506

--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Using the expressions valgrind uses for ARM to compute flags from ADDS and SUBS
instructions and a program that simulates it on just 8-bit values instead of
32-bit ones, it seems the only problematic values where the flags change are 0
and INT_MIN.  By swapping the alternatives, I think the desirable one (subs)
should trigger for both, so the above patch should be hopefully correct.  Will
bootstrap/regtest it.