[Bug middle-end/91708] [10 regression][ARM] Bootstrap fails in gen_movsi, at config/arm/arm.md:5258

[wilco at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91708

--- Comment #18 from Wilco <wilco at gcc dot gnu.org> ---
(In reply to Richard Earnshaw from comment #17)
> So do we have a testcase that shows the problem on older compilers?

Yes, the same testcase shows the same incorrect substitution in older
compilers. I tried GCC9, but the MEM to MEM change dates back much further.