Difference between revisions of "Shift left"
From Unofficial QEdit Wiki Guide
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==Use== | ==Use== | ||
| − | Used to execute a logical bitwise operation shift left. Use [[shift_right]] to shift right. | + | Used to execute a logical bitwise operation shift left. Use [[shift_right]] to shift right.<br /> |
| − | In the example below we'll use R1 to store a 7Bit value 100 decimal (127 decimal value maximum) and 2 seperate flags. | + | In the example below we'll use R1 to store a 7Bit value 100 decimal (127 decimal value maximum) and 2 seperate flags set true.<br /> |
| + | 1100100 = 100 Decimal<br /> | ||
| + | 1 = Flag 1 true<br /> | ||
| + | 1 = Flag 2 true<br /> | ||
| + | Value to store 110010011 (403 decimal, 193 hex) | ||
==Example== | ==Example== | ||
Revision as of 16:25, 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 set true.
1100100 = 100 Decimal
1 = Flag 1 true
1 = Flag 2 true
Value to store 110010011 (403 decimal, 193 hex)
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.
