[Bug tree-optimization/117322] [14/15 Regression] Another spurios "may be used uninitialized" warning when using alloca.

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117322

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
So adding:
  if ((long)(len*4) <= 0) return;

Fixes the warning.

Looks like GCC does not realize len can't be too big to overflow.

I am not 100% sure if the warning should be better worded or there is a missed
optimization here.