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
B
B
Rd Rs → Rd, Rd #IMM → Rd
Performs a logical OR operation on a general register and another
general register or immediate data
XOR
NOT
Rd Rs → Rd, Rd #IMM → Rd
Performs a logical exclusive OR operation on a general register and
another general register or immediate data
~ 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
SHAR
B
Rd shift → Rd
Performs an arithmetic shift operation on general register contents
Rd shift → Rd
SHLL
SHLR
B
B
B
Performs a logical shift operation on general register contents
Rd rotate → Rd
ROTL
ROTR
Rotates general register contents
Rd rotate through carry → Rd
ROTXL
ROTXR
Rotates general register contents through the C (carry) bit
Notes: * Size:Operand size
B: Byte
33
ETC [ ETC ]
