X86InstrInfo.td

                  "fucomp $reg", []>, DD, Imp<[ST0],[]>;
def FUCOMPPr  : I<0xE9, RawFrm,                // cmp ST(0) with ST(1), pop, pop
                  (ops variable_ops),
                  "fucompp", []>, DA, Imp<[ST0],[]>;

def FUCOMIr  : FPI<0xE8, AddRegFrm, CompareFP,  // CC = cmp ST(0) with ST(i)
                   (ops RST:$reg, variable_ops),
                   "fucomi {$reg, %ST(0)|%ST(0), $reg}">, DB, Imp<[ST0],[]>;
def FUCOMIPr : I<0xE8, AddRegFrm,              // CC = cmp ST(0) with ST(i), pop
                 (ops RST:$reg, variable_ops),
                 "fucomip {$reg, %ST(0)|%ST(0), $reg}", []>, DF, Imp<[ST0],[]>;


// Floating point flag ops
def FNSTSW8r  : I<0xE0, RawFrm,                  // AX = fp flags
                  (ops), "fnstsw", []>, DF, Imp<[],[AX]>;

def FNSTCW16m : I<0xD9, MRM7m,                   // [mem16] = X87 control world
                  (ops i16mem:$dst), "fnstcw $dst", []>;
def FLDCW16m  : I<0xD9, MRM5m,                   // X87 control world = [mem16]
                  (ops i16mem:$dst), "fldcw $dst", []>;