Specifications

Intel
®
64 and IA-32 Architectures Software Developer’s Manual Documentation Changes 191
Documentation Changes
Instruction Operand Encoding
...
STR—Store Task Register
Instruction Operand Encoding
...
Opcode Instruction Op/
En
64-Bit
Mode
Compat/
Leg Mode
Description
AA STOSB A Valid Valid For legacy mode, store AL at
address ES:(E)DI; For 64-bit
mode store AL at address
RDI or EDI.
AB STOSW A Valid Valid For legacy mode, store AX
at address ES:(E)DI; For 64-
bit mode store AX at
address RDI or EDI.
AB STOSD A Valid Valid For legacy mode, store EAX
at address ES:(E)DI; For 64-
bit mode store EAX at
address RDI or EDI.
REX.W + AB STOSQ A Valid N.E. Store RAX at address RDI or
EDI.
Op/En Operand 1 Operand 2 Operand 3 Operand 4
ANA NA NA NA
Opcode Instruction Op/
En
64-Bit
Mode
Compat/
Leg Mode
Description
0F 00 /1 STR r/m16 A Valid Valid Stores segment selector
from TR in r/m16.
Op/En Operand 1 Operand 2 Operand 3 Operand 4
A ModRM:r/m (w) NA NA NA