#include static const unsigned int divtab[244] = { [1] = 0xffff + 1l, [3] = 0x5555 + 1l, [9] = 0x1c71 + 1l, [27] = 0x097b + 1l, [81] = 0x0329 + 1l, [243] = 0x010d + 1l }; #define FASTDIV(n, d) (((n) * divtab[d]) >> 16) int new32v2(int i, int x, int y) { int A; A = FASTDIV(i, y); return i + (x - 3 * FASTDIV(A + x, 3) + 3 * FASTDIV(A, 3)) * y; }