https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109414
--- Comment #4 from Sinan <sinan.lin at linux dot alibaba.com> --- (In reply to Andrew Pinski from comment #1) > Actually this more related to WORD_REGISTER_OPERATIONS . > > (insn 7 4 8 2 (set (reg:SI 77) > (plus:SI (subreg/s/u:SI (reg/v:DI 74 [ x ]) 0) > (const_int 1 [0x1]))) "/app/example.cpp":3:12 -1 > (nil)) > > GCC then thinks that is an add on all 64bit which is not true ... Hi Andrew, thanks for the info. I don't see anything things we could do for WORD_REGISTER_OPERATIONS. Maybe we still need to handle these insn case by case in the backend?
