fp_addr
union fp_addr s87_ip; /* floating point instruction pointer */
union fp_addr s87_dp; /* floating operand offset */
union fp_addr fx_ip; /* FPU Instruction Pointer */
union fp_addr fx_dp; /* FPU Data pointer */
union fp_addr ip;
union fp_addr dp;
union fp_addr s87_ip;
union fp_addr s87_dp;
typedef int sizeof_fp_addr[-(int)sizeof(union fp_addr)];
union fp_addr s87_ip;
union fp_addr s87_dp;