[Bug target/77579] Missed multiple add (int) for CSEd case

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77579

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Just so there is no confussion on the testcase here it is without need the -D
option:
void f(int x, int y, int z, int *s)
{
   int t = y * z;
   s[0] = t + x;
   s[1] = x - t;
}