Intel® Architecture Instruction Set Extensions Programming Reference

OPCODE MAP
Table A-20 shows the opcode map if the ModR/M byte is outside the range of 00H-BFH. The first digit of the ModR/M byte selects
the table row and the second digit selects the column.
Table A-20. DE Opcode Map When ModR/M Byte is Outside 00H to BFH *
0 1 2 3 4 5 6 7
C FADDP
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)
D
E FSUBRP
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)
F FDIVRP
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)
8 9 A B C D E F
C FMULP
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)
D FCOMPP
E FSUBP
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)
F FDIVP
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)
NOTES:
* All blanks in all opcode maps are reserved and must not be used. Do not depend on the operation of undefined or reserved locations.
A.5.2.8 Escape Opcodes with DF As First Byte
Table A-21 and A-22 contain the opcode maps for escape instruction opcodes that begin with DFH. Table A-21 shows the opcode
map if the ModR/M byte is in the range of 00H-BFH. Here, the value of bits 3-5 (the nnn field in Figure A-1) selects the instruction.
Table A-21. DF Opcode Map When ModR/M Byte is Within 00H to BFH *
nnn Field of ModR/M Byte
000B 001B 010B 011B 100B 101B 110B 111B
FILD
FISTTP
FIST
FISTP
FBLD
FILD
FBSTP
FISTP
word-integer
NOTES:
word-integer word-integer word-integer packed-BCD qword-integer packed-BCD qword-integer
* All blanks in all opcode maps are reserved and must not be used. Do not depend on the operation of undefined or reserved locations.
A-28 Ref. # 319433-014