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Intel® Architecture Instruction Set Extensions Programming Reference

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OPCODE MAP<br />

Table A-22 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<br />

the table row and the second digit selects the column.<br />

C<br />

D<br />

E FSTSW<br />

AX<br />

Table A-22. DF Opcode Map When ModR/M Byte is Outside 00H to BFH *<br />

0 1 2 3 4 5 6 7<br />

F FCOMIP<br />

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)<br />

C<br />

D<br />

8 9 A B C D E F<br />

E FUCOMIP<br />

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)<br />

F<br />

NOTES:<br />

* All blanks in all opcode maps are reserved and must not be used. Do not depend on the operation of undefined or reserved locations.<br />

Ref. # 319433-014 A-29

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