[Bug tree-optimization/96696] Failure to optimize div+mul to mod+sub

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96696

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
I'd say doing sth at RTL expansion.  For GIMPLE we should consider the cases

int g1, g2;
int f(int x, int y)
{
    g1 = x / y;
    return x - (x % y);
}

int g(int x, int y)
{
    g2 = x % y;
    return (x / y) * y;
}

in terms of CSE.