Intel® Architecture Instruction Set Extensions Programming Reference

OPCODE MAP
Table A-10 shows the map if the ModR/M byte is outside the range of 00H-BFH. Here, the first digit of the ModR/M byte selects
the table row and the second digit selects the column.
Table A-10. D9 Opcode Map When ModR/M Byte is Outside 00H to BFH *
0 1 2 3 4 5 6 7
C FLD
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)
D FNOP
E FCHS FABS FTST FXAM
F F2XM1 FYL2X FPTAN FPATAN FXTRACT FPREM1 FDECSTP FINCSTP
8 9 A B C D E F
C FXCH
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)
D
E FLD1 FLDL2T FLDL2E FLDPI FLDLG2 FLDLN2 FLDZ
F FPREM FYL2XP1 FSQRT FSINCOS FRNDINT FSCALE FSIN FCOS
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.5.2.3 Escape Opcodes with DA as First Byte
Table A-11 and A-12 contain maps for escape instruction opcodes that begin with DAH. Table A-11 shows the 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-11. DA 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
FIADD
FIMUL FICOM FICOMP FISUB FISUBR FIDIV
FIDIVR
dword-integer
NOTES:
dword-integer dword-integer dword-integer dword-integer dword-integer dword-integer dword-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.
Ref. # 319433-014 A-23