λ x : word64 * word64 * word64 * word64 * word64 * word64,
Interp-η
(λ var : Syntax.base_type → Type,
 λ '(x9, x10, x8, x6, x4, x2)%core,
 uint128_t x11 = (((uint128_t)x2 * x9) + (((uint128_t)x4 * x10) + (((uint128_t)x6 * x8) + (((uint128_t)x8 * x6) + (((uint128_t)x10 * x4) + ((uint128_t)x9 * x2))))));
 uint128_t x12 = ((((uint128_t)x2 * x10) + ((0x2 * ((uint128_t)x4 * x8)) + (((uint128_t)x6 * x6) + ((0x2 * ((uint128_t)x8 * x4)) + ((uint128_t)x10 * x2))))) + (0x9 * (0x2 * ((uint128_t)x9 * x9))));
 uint128_t x13 = ((((uint128_t)x2 * x8) + (((uint128_t)x4 * x6) + (((uint128_t)x6 * x4) + ((uint128_t)x8 * x2)))) + (0x9 * (((uint128_t)x10 * x9) + ((uint128_t)x9 * x10))));
 uint128_t x14 = ((((uint128_t)x2 * x6) + ((0x2 * ((uint128_t)x4 * x4)) + ((uint128_t)x6 * x2))) + (0x9 * ((0x2 * ((uint128_t)x8 * x9)) + (((uint128_t)x10 * x10) + (0x2 * ((uint128_t)x9 * x8))))));
 uint128_t x15 = ((((uint128_t)x2 * x4) + ((uint128_t)x4 * x2)) + (0x9 * (((uint128_t)x6 * x9) + (((uint128_t)x8 * x10) + (((uint128_t)x10 * x8) + ((uint128_t)x9 * x6))))));
 uint128_t x16 = (((uint128_t)x2 * x2) + (0x9 * ((0x2 * ((uint128_t)x4 * x9)) + (((uint128_t)x6 * x10) + ((0x2 * ((uint128_t)x8 * x8)) + (((uint128_t)x10 * x6) + (0x2 * ((uint128_t)x9 * x4))))))));
 uint64_t x17 = (uint64_t) (x16 >> 0x36);
 uint64_t x18 = ((uint64_t)x16 & 0x3fffffffffffff);
 uint128_t x19 = (x17 + x15);
 uint64_t x20 = (uint64_t) (x19 >> 0x35);
 uint64_t x21 = ((uint64_t)x19 & 0x1fffffffffffff);
 uint128_t x22 = (x20 + x14);
 uint64_t x23 = (uint64_t) (x22 >> 0x36);
 uint64_t x24 = ((uint64_t)x22 & 0x3fffffffffffff);
 uint128_t x25 = (x23 + x13);
 uint64_t x26 = (uint64_t) (x25 >> 0x35);
 uint64_t x27 = ((uint64_t)x25 & 0x1fffffffffffff);
 uint128_t x28 = (x26 + x12);
 uint64_t x29 = (uint64_t) (x28 >> 0x36);
 uint64_t x30 = ((uint64_t)x28 & 0x3fffffffffffff);
 uint128_t x31 = (x29 + x11);
 uint64_t x32 = (uint64_t) (x31 >> 0x35);
 uint64_t x33 = ((uint64_t)x31 & 0x1fffffffffffff);
 uint64_t x34 = (x18 + (0x9 * x32));
 uint64_t x35 = (x34 >> 0x36);
 uint64_t x36 = (x34 & 0x3fffffffffffff);
 uint64_t x37 = (x35 + x21);
 uint64_t x38 = (x37 >> 0x35);
 uint64_t x39 = (x37 & 0x1fffffffffffff);
 return (Return x33, Return x30, Return x27, (x38 + x24), Return x39, Return x36))
x
     : word64 * word64 * word64 * word64 * word64 * word64 → ReturnType (uint64_t * uint64_t * uint64_t * uint64_t * uint64_t * uint64_t)