OPCODE MAP
A.5.7. Escape Opcodes with DE as First Byte
Tables A-6 and A-13 contain the opcodes maps for the escape instruction opcodes that begin with DEH. Table A-6 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) selects the instruction.
Table A-16. DE Opcode Map When ModR/M Byte is Within 00H to BFH1
nnn Field of ModR/M Byte (see Figure A-1)
000 |
001 |
010 |
011 |
100 |
101 |
110 |
111 |
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FIADD |
FIMUL |
FICOM |
FICOMP |
FISUB |
FISUBR |
FIDIV |
FIDIVR |
word-integer |
word-integer |
word-integer |
word-integer |
word-integer |
word-integer |
word-integer |
word-integer |
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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-13 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.
A-22
OPCODE MAP
Table A-17. DE Opcode Map When ModR/M Byte is Outside 00H to BFH1
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0 |
1 |
2 |
3 |
4 |
5 |
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7 |
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C |
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FADDP |
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ST(0),ST(0) |
ST(1),ST(0) |
ST(2),ST(0) |
ST(3),ST(0) |
ST(4),ST(0) |
ST(5),ST(0) |
ST(6),ST(0) |
ST(7),ST(0) |
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D |
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E |
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FSUBRP |
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ST(0),ST(0) |
ST(1),ST(0) |
ST(2),ST(0) |
ST(3),ST(0) |
ST(4),ST(0) |
ST(5),ST(0) |
ST(6),ST(0) |
ST(7),ST(0) |
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F |
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FDIVRP |
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ST(0),ST(0) |
ST(1),ST(0) |
ST(2),ST(0) |
ST(3),ST(0) |
ST(4),ST(0) |
ST(5),ST(0) |
ST(6),ST(0) |
ST(7),ST(0) |
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8 |
9 |
A |
B |
C |
D |
E |
F |
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C |
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FMULP |
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ST(0),ST(0) |
ST(1),ST(0) |
ST(2),ST(0) |
ST(3),ST(0) |
ST(4),ST(0) |
ST(5),ST(0) |
ST(6),ST(0) |
ST(7),ST(0) |
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D |
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FCOMPP |
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E |
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FSUBP |
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ST(0),ST(0) |
ST(1),ST(0) |
ST(2),ST(0) |
ST(3),ST(0) |
ST(4),ST(0) |
ST(5),ST(0) |
ST(6),ST(0) |
ST(7),ST(0) |
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F |
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FDIVP |
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ST(0),ST(0) |
ST(1),ST(0) |
ST(2),ST(0). |
ST(3),ST(0) |
ST(4),ST(0) |
ST(5),ST(0) |
ST(6),ST(0) |
ST(7),ST(0) |
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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.
A-23
OPCODE MAP
A.5.8. Escape Opcodes with DF As First Byte
Tables A-6 and A-13 contain the opcodes maps for the escape instruction opcodes that begin with DFH. Table A-6 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) selects the instruction.
Table A-18. DF Opcode Map When ModR/M Byte is Within 00H to BFH1
nnn Field of ModR/M Byte (see Figure A-1)
000 |
001 |
010 |
011 |
100 |
101 |
110 |
111 |
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FILD |
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FIST |
FISTP |
FBLD |
FILD |
FBSTP |
FISTP |
word-integer |
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word-integer |
word-integer |
packed-BCD |
long-integer |
packed-BCD |
long-integer |
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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-13 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.
A-24
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OPCODE MAP |
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Table A-19. DF Opcode Map When ModR/M Byte is Outside 00H to BFH1 |
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0 |
1 |
2 |
3 |
4 |
5 |
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7 |
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C |
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D |
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E |
FSTSW |
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AX |
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F |
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FCOMIP |
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ST(0),ST(0) |
ST(0),ST(1) |
ST(0),ST(2) |
ST(0),ST(3) |
ST(0),ST(4) |
ST(0),ST(5) |
ST(0),ST(6) |
ST(0),ST(7) |
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8 |
9 |
A |
B |
C |
D |
E |
F |
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C |
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D |
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E |
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FUCOMIP |
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ST(0),ST(0) |
ST(0),ST(1) |
ST(0),ST(2) |
ST(0),ST(3) |
ST(0),ST(4) |
ST(0),ST(5) |
ST(0),ST(6) |
ST(0),ST(7) |
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F |
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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.
A-25
B
Instruction Formats
and Encodings