https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106602
--- Comment #13 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Trying 7, 8, 9 -> 10:
7: r140:DI=0x1
8: r141:DI=r140:DI<<0x26
REG_DEAD r140:DI
REG_EQUAL 0x4000000000
9: r139:DI=r141:DI-0x40
REG_DEAD r141:DI
REG_EQUAL 0x3fffffffc0
10: r137:DI=r138:DI&r139:DI
REG_DEAD r139:DI
REG_DEAD r138:DI
Failed to match this instruction:
(set (reg:DI 137)
(and:DI (reg:DI 138)
(const_int 274877906880 [0x3fffffffc0])))
That's what we're looking for. I think I had a wrong switch somewhere. Match
that with a define_split and you should be good to go.
