gf_weak_reduce
gf_weak_reduce(out);
gf_weak_reduce(out);
gf_weak_reduce(a); /* or 1+e */
gf_weak_reduce(a); /* Determined to have negligible perf impact. */
gf_weak_reduce(d);
gf_weak_reduce(d);
gf_weak_reduce(c);
gf_weak_reduce(c);
static INLINE_UNUSED void gf_weak_reduce(gf inout);