λ x x0 : word64 * word64,
Interp-η
(λ var : Syntax.base_type → Type,
 λ '(x4, x5, (x6, x7))%core,
 uint64_t x9, uint8_t x10 = subborrow_u64(0x0, x5, x7);
 uint64_t x12, uint8_t x13 = subborrow_u64(x10, x4, x6);
 uint64_t x14 = cmovznz64(x13, 0x0, 0xffffffffffffffffL);
 uint64_t x15 = (x14 & 0xffffffffffffffffL);
 uint64_t x17, uint8_t x18 = addcarryx_u64(0x0, x9, x15);
 uint64_t x19 = (x14 & 0x7fffffffffffffffL);
 uint64_t x21, uint8_t _ = addcarryx_u64(x18, x12, x19);
 (Return x21, Return x17))
(x, x0)%core
     : word64 * word64 → word64 * word64 → ReturnType (uint64_t * uint64_t)