2.5.3 Logic Operations
Table 2-6 describes the four instructions that perform logic operations.
Table 2-6 Logic Operation Instructions
Instruction
Size
*
Function
AND
B
Rd
∧
Rs
→
Rd, Rd
∧
#IMM
→
Rd
Performs a logical AND operation on a general register and another
general register or immediate data
OR
B
Rd
∨
Rs
→
Rd, Rd
∨
#IMM
→
Rd
Performs a logical OR operation on a general register and another
general register or immediate data
XOR
B
Rd
⊕
Rs
→
Rd, Rd
⊕
#IMM
→
Rd
Performs a logical exclusive OR operation on a general register and
another general register or immediate data
NOT
B
~ Rd
→
Rd
Obtains the one’s complement (logical complement) of general register
contents
Notes:
*
Size: Operand size
B:
Byte
2.5.4 Shift Operations
Table 2-7 describes the eight shift instructions.
Table 2-7 Shift Instructions
Instruction
Size
*
Function
SHAL
B
Rd shift
→
Rd
SHAR
Performs an arithmetic shift operation on general register contents
SHLL
B
Rd shift
→
Rd
SHLR
Performs a logical shift operation on general register contents
ROTL
B
Rd rotate
→
Rd
ROTR
Rotates general register contents
ROTXL
B
Rd rotate through carry
→
Rd
ROTXR
Rotates general register contents through the C (carry) bit
Notes:
*
Size: Operand size
B:
Byte
31