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Shift by 4 bits at a time

Code:

Alex Davies of Ace Electronics Engineering Says:

You can save 1 word per byte on the above by using XOR swaps with W as a carry register. ie, to shift to the left by a nibble:

SWAPF TEMP0, W
MOVWF TEMP0
ANDLW 0x0F
XORWF TEMP0, F

SWAPF TEMP1, F
XORWF TEMP1, F
XORWF TEMP1, W
ANDLW 0x0F
XORWF TEMP1, F

SWAPF TEMP2, F
XORWF TEMP2, F
XORWF TEMP2, W
ANDLW 0x0F
XORWF TEMP2, F

...

(untested)
+

See also:


file: /Techref/microchip/math/bit/shift4.htm, 1KB, , updated: 2010/3/1 16:52, local time: 2020/11/26 16:52, owner: mark_jeronimus-gmail-,
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