[Bug rtl-optimization/77416] [7 Regression] LRA rematerializing use of CA reg across function call

[bergner at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77416

--- Comment #6 from Peter Bergner <bergner at gcc dot gnu.org> ---
Looking closer, it does seem remat is trying to handle these hard coded
registers via its hard_regs field.  One thing that strikes me as I look at that
code, it checks for reg->type being == OP_IN or != OP_IN and for this
particular pattern, the CA reg->type is OP_INOUT which I could see causing
issues since we don't seem to handle inout regs.