83     mpd_size_t m, mhalf;  in fnt_dif2()  local
93     mhalf = n / 2;  in fnt_dif2()
94     for (j = 0; j < mhalf; j += 2) {  in fnt_dif2()
100         v0 = a[j+mhalf];  in fnt_dif2()
103         v1 = a[j+1+mhalf];  in fnt_dif2()
113         a[j+mhalf] = v0;  in fnt_dif2()
114         a[j+1+mhalf] = v1;  in fnt_dif2()
121         mhalf = m / 2;  in fnt_dif2()
127             v0 = a[r+mhalf];  in fnt_dif2()
130             v1 = a[m+r+mhalf];  in fnt_dif2()
138             a[r+mhalf] = v0;  in fnt_dif2()
139             a[m+r+mhalf] = v1;  in fnt_dif2()
142         for (j = 1; j < mhalf; j++) {  in fnt_dif2()
149                 v0 = a[r+j+mhalf];  in fnt_dif2()
152                 v1 = a[m+r+j+mhalf];  in fnt_dif2()
162                 a[r+j+mhalf] = v0;  in fnt_dif2()
163                 a[m+r+j+mhalf] = v1;  in fnt_dif2()