A-14
OPCODE MAP
A.2.6.4.ESCAPE OPCODES WITH D9 AS FIRST BYTE
Table A-9 and A-10 contain opcodes maps for escape instruction opcodes that begin with D9H.
Table A-9 shows the opcode map if the accompanying ModR/M byte is within the range of 00H
through BFH. Here, the value of bits 5, 4, and 3 (the Figure A-1 nnn field) selects the instruction.
Table A-9. D9 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-10 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
010
011
100101110
111
FLD
single-real
FST
single-real
FSTP
single-real
FLDENV
14/28 bytes
FLDCW
2 bytes
FSTENV
14/28 bytes
FSTCW
2 bytes
