[Bug target/93243] misoptimization: minor changes of the code leads change up to +/- 30% performance on x86_64, -Os faster than -Ofast/O2/O3

[crazylht at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93243

--- Comment #2 from Hongtao.liu <crazylht at gmail dot com> ---

> The diffs in the source code are:
> #if CASE & 1
> #define CMP(a, b) ((a) < (b))
> #else
> #define CMP(a, b) (((a) - (b)) < 0)
> #endiF
> 
(a) < (b) is not equal to ((a) - (b) < 0)
Compiler will trait them differently.