31
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
Note:
*
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
SHAR
B
Rd shift
→
Rd
Performs an arithmetic shift operation on general register contents
SHLL
SHLR
B
Rd shift
→
Rd
Performs a logical shift operation on general register contents
ROTL
ROTR
B
Rd rotate
→
Rd
Rotates general register contents
ROTXL
ROTXR
B
Rd rotate through carry
→
Rd
Rotates general register contents through the C (carry) bit
Note:
*
Size: Operand size
B: Byte