λ x : word32 * word32 * word32 * word32,
Interp-η
(λ var : Syntax.base_type → Type,
 λ '(x5, x6, x4, x2)%core,
 uint32_t x8, uint8_t x9 = subborrow_u32(0x0, 0x0, x2);
 uint32_t x11, uint8_t x12 = subborrow_u32(x9, 0x0, x4);
 uint32_t x14, uint8_t x15 = subborrow_u32(x12, 0x0, x6);
 uint32_t x17, uint8_t x18 = subborrow_u32(x15, 0x0, x5);
 uint32_t x19 = cmovznz32(x18, 0x0, 0xffffffff);
 uint32_t x20 = (x19 & 0xffffffff);
 uint32_t x22, uint8_t x23 = addcarryx_u32(0x0, x8, x20);
 uint32_t x24 = (x19 & 0xffffffff);
 uint32_t x26, uint8_t x27 = addcarryx_u32(x23, x11, x24);
 uint32_t x28 = (x19 & 0xffffffff);
 uint32_t x30, uint8_t x31 = addcarryx_u32(x27, x14, x28);
 uint32_t x32 = (x19 & 0x7fffffff);
 uint32_t x34, uint8_t _ = addcarryx_u32(x31, x17, x32);
 (Return x34, Return x30, Return x26, Return x22))
x
     : word32 * word32 * word32 * word32 → ReturnType (uint32_t * uint32_t * uint32_t * uint32_t)