[Bug target/107172] [13 Regression] wrong code with "-O1 -ftree-vrp" on x86_64-linux-gnu since r13-1268-g8c99e307b20c502e

[crazylht at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107172

--- Comment #23 from Hongtao.liu <crazylht at gmail dot com> ---
looking at i386.c put_condition_code used by *setcc_qi, it looks like (EQ
(reg:CCCmode FLAG_REG) (const_int 0)) means get carry flag.
Not (LTU: (REG:CCCmode FLAGS_REG) (const_int 0)).
Now I got more confused.