Difference between revisions of "Shift left"
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<span style='color:blue'>100: </span><span style='color:green'>leti </span>R1, 00000193 <span style='color:orange'>//Set R1 to 403 (110010011 in binary)</span> | <span style='color:blue'>100: </span><span style='color:green'>leti </span>R1, 00000193 <span style='color:orange'>//Set R1 to 403 (110010011 in binary)</span> | ||
<span style='color:green'> let </span>R2, R1 <span style='color:orange'>//This will be used for 7bit value</span> | <span style='color:green'> let </span>R2, R1 <span style='color:orange'>//This will be used for 7bit value</span> | ||
| − | <span style='color:green'> leti </span>R5, 00000002 <span style='color:orange'>//This will be used to store the | + | <span style='color:green'> leti </span>R5, 00000002 <span style='color:orange'>//This will be used to store the SHIFT amount</span> |
<span style='color:green'> andi </span>R2, 000001FC <span style='color:orange'>//Perform bitwise AND operation on R2 using 111111100 binary. R2 now equals 110010000</span> | <span style='color:green'> andi </span>R2, 000001FC <span style='color:orange'>//Perform bitwise AND operation on R2 using 111111100 binary. R2 now equals 110010000</span> | ||
| − | <span style='color:green'> shift_right </span>R2, R5 <span style='color:orange'>//Perform bitwise | + | <span style='color:green'> shift_right </span>R2, R5 <span style='color:orange'>//Perform bitwise SHIFT RIGHT on R2. Value changed from 400 (110010000) to 100 (1100100)</span> |
<span style='color:green'> let </span>R3, R1 <span style='color:orange'>//This will be used to store the first flag</span> | <span style='color:green'> let </span>R3, R1 <span style='color:orange'>//This will be used to store the first flag</span> | ||
<span style='color:green'> let </span>R4, R1 <span style='color:orange'>//This will be used to store the second flag</span> | <span style='color:green'> let </span>R4, R1 <span style='color:orange'>//This will be used to store the second flag</span> | ||
Revision as of 16:19, 4 May 2011
Contents
Syntax
Syntax: shift_left register1, register2
- register1 = Register to shift left
- register2 = Shift left by value of register2
Use
Used to execute a logical bitwise operation shift left. Use shift_right to shift right. In the example below we'll use R1 to store a 7Bit value 100 decimal (127 decimal value maximum) and 2 seperate flags.
Example
100: leti R1, 00000193 //Set R1 to 403 (110010011 in binary)
let R2, R1 //This will be used for 7bit value
leti R5, 00000002 //This will be used to store the SHIFT amount
andi R2, 000001FC //Perform bitwise AND operation on R2 using 111111100 binary. R2 now equals 110010000
shift_right R2, R5 //Perform bitwise SHIFT RIGHT on R2. Value changed from 400 (110010000) to 100 (1100100)
let R3, R1 //This will be used to store the first flag
let R4, R1 //This will be used to store the second flag
ret
Also see
List of OP Codes used in example.
