A-21
OPCODE MAP
A.2.6.9.ESCAPE OPCODES WITH DE AS FIRST BYTE
Table A-19 and A-20 contain the opcodes maps for the escape instruction opcodes that begin
with DEH. Table A-19 shows the opcode map if the accompanying ModR/M byte within the
range of 00H through BFH. Here, the value of bits 5, 4, and 3 (the nnn field in Figure A-1) se-
lects the instruction.
Table A-19. DE Opcode Map When ModR/M Byte is Within 00H to BFH
1
NOTE:
1.All blanks in the opcode map are reserved and should not be used. Do not depend on the operation of
these undefined opcodes.
Table A-20 shows the opcode map if the accompanying ModR/M byte is outside the range of
00H to BFH. In this case the first digit of the ModR/M byte selects the row in the table and the
second digit selects the column.
nnn Field of ModR/M Byte (refer to Figure A-1)
000
001
010011100101110
111
FIADD
word-integer
FIMUL
word-integer
FICOM
word-integer
FICOMP
word-integer
FISUB
word-integer
FISUBR
word-integer
FIDIV
word-integer
FIDIVR
word-integer
