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Intel® Architecture Instruction Set Extensions Programming Reference

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OPCODE MAP<br />

Opcode Group Mod 7,6 pfx<br />

0F AE 15<br />

0F 18 16<br />

VEX.0F38 F3 17<br />

NOTES:<br />

Table A-6. Opcode <strong>Extensions</strong> for One- and Two-byte Opcodes by Group Number * (Contd.)<br />

Encoding of Bits 5,4,3 of the ModR/M Byte (bits 2,1,0 in parenthesis)<br />

000 001 010 011 100 101 110 111<br />

mem fxsave fxrstor ldmxcsr stmxcsr XSAVE XRSTOR XSAVEOPT clflush<br />

11B<br />

mem<br />

11B<br />

F3 RDFSBASE<br />

Ry<br />

prefetch<br />

NTA<br />

RDGSBASE<br />

Ry<br />

prefetch<br />

T0<br />

mem BLSR v<br />

11B<br />

By, Ey<br />

WRFSBASE<br />

Ry<br />

prefetch<br />

T1<br />

BLSMSK v<br />

By, Ey<br />

WRGSBASE<br />

Ry<br />

lfence mfence sfence<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 />

A-20 Ref. # 319433-014<br />

prefetch<br />

T2<br />

BLSI v<br />

By, Ey

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