https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87507
--- Comment #3 from Peter Bergner <bergner at gcc dot gnu.org> --- So the register pair r7,r8 is free to assign to TImode pseudo 126 in assign_hard_reg(), but its cost is 1000, while the cost of r30,r31 somehow looks to be zero, so we choose it instead!?!? Not sure how r30,r31 incorrectly got a cost of zero.
