FFI: Move code for cdata arithmetic to lj_carith.c.

src/lj_cdata.c

@@ -251,38 +251,4 @@ void lj_cdata_set(CTState *cts, CType *d, uint8_t *dp, TValue *o, CTInfo qual)
   lj_cconv_ct_tv(cts, d, dp, o, 0);
 }
 
-/* -- 64 bit integer arithmetic helpers ----------------------------------- */
-
-/* 64 bit integer x^k. */
-uint64_t lj_cdata_powi64(uint64_t x, uint64_t k, int isunsigned)
-{
-  uint64_t y = 0;
-  if (k == 0)
-    return 1;
-  if (!isunsigned) {
-    if ((int64_t)k < 0) {
-      if (x == 0)
-	return U64x(7fffffff,ffffffff);
-      else if (x == 1)
-	return 1;
-      else if ((int64_t)x == -1)
-	return (k & 1) ? -1 : 1;
-      else
-	return 0;
-    }
-  }
-  for (; (k & 1) == 0; k >>= 1) x *= x;
-  y = x;
-  if ((k >>= 1) != 0) {
-    for (;;) {
-      x *= x;
-      if (k == 1) break;
-      if (k & 1) y *= x;
-      k >>= 1;
-    }
-    y *= x;
-  }
-  return y;
-}
-
 #endif