https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68277
--- Comment #1 from Kazumoto Kojima <kkojima at gcc dot gnu.org> --- Created attachment 36686 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36686&action=edit reduced test case for -O1 It fails on trunk too. It seems that the problematic add insn (insn 765 764 300 46 (set (reg:SI 10 r10) (plus:SI (reg:SI 1 r1) (const_int 4 [0x4]))) add3i.c:7 66 {*addsi3} (nil)) is generated with the old reload to load a memory address of the complex atomic_compare_and_swapsi_soft_gusa insn and postreload complains about that insn.