FP_EX_UNDERFLOW
#define FP_EX_UNDERFLOW IEEE_TRAP_ENABLE_UNF
#define FP_EX_UNDERFLOW (1 << 18)
#define FP_EX_UNDERFLOW (1 << (31 - 4))
#define FP_EX_UNDERFLOW (1<<1)
#define FP_EX_UNDERFLOW (1 << 2)
#define FP_EX_UNDERFLOW (1 << 2)
#define FP_EX_UNDERFLOW