[Bug middle-end/114547] comparison than less than 0 (or greater or equal to than 0) after a subtraction does not use the flags regster

[goon.pri.low at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114547

--- Comment #2 from gooncreeper <goon.pri.low at gmail dot com> ---
(In reply to Andrew Pinski from comment #1)
> I am not sure this is always better ...

sets and setns are 1 uop, just like any other setcc
why wouldn't it be better?