DO 1,0,1,1 ; Define One bit

Index > Macroinstructions > DO 1,0,1,1 ; Define One bit

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edfed

Joined: 20 Feb 2006
Posts: 4350
Location: Now

edfed 20 Jan 2010, 01:32

hello macro addicts.

just to try, define a macro as:

DA, define atomic bit
)
or
DO, define one bit

Code:

macro da [args]
{
local .bit
local .byte
.bit=1
.byte=0
.loop:
.byte=[arg.a]

arghhhh!!

and then, when i write it:

Code:

da 0,0,1,1,1,1,0,1,0,0,1,1,1,0

it will be equivalent to:

Code:

db 10111100b,00011100b
;or 
dw 000111001011100b

first bit is the bit#0of the first byte.
8th bit is the last bit of the first byte.
may be usefull in bitmanipulation code

of course, a label cannot be defined for a bit. at least for byte.

if less than one byte (8_bits) are defined, one byte is defined. filled with 0.

i don't see how to do that with macro. but i'm sure it is possible.

thanks for help. Smile

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20 Jan 2010, 01:32

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20700
Location: In your JS exploiting you and your system

revolution 20 Jan 2010, 02:21

Code:

macro defineBitMap [bit] {
common
local .bit,.byte
 .bit=1
 .byte=0
forward
 if bit <> 0
  .byte=.byte+.bit
 end if
 .bit=.bit+.bit
 if .bit>255
  db .byte
  .byte=0
  .bit=1
 end if
common
 if .bit>1
  db .byte
 end if
}

Untested

20 Jan 2010, 02:21

edfed

Joined: 20 Feb 2006
Posts: 4350
Location: Now

edfed 20 Jan 2010, 03:06

it's ok, cool, tanks a lot revolution.

da ,Define A(1) bit

or maybe,... bit?

bit 0,1,0,0,1,1,0,0

it works with this:

Code:

da 0,0,1,1,0,0,1,1,0,0,0,0,1,1,1,1,0,1,0,1,0,1,0,1,0,0,0,1,1,1
dd 111000101010101111000011001100b

it generates two identical dwords.

20 Jan 2010, 03:06

hopcode

Joined: 04 Mar 2008
Posts: 563
Location: Germany

hopcode 21 Jan 2010, 06:17

cool,

but imho should be considered endianess,it is to say, the WYSIWYG factor, that simplify readability, it is to say the packing method db/dw/dd
I have written different of these bit packers. one is here
http://board.flatassembler.net/topic.php?t=9905
but not really improved as my new ones, that i cannot find at the moment

using reverse instead of forward is more WYSIWYG but not dd/dw
packed

Code:

 
macro defineBitMap [bit] {
common
local .bit,.byte
 .bit=1
 .byte=0
reverse
 if bit <> 0
  .byte=.byte+.bit
 end if
 .bit=.bit+.bit
 if .bit>255
  db .byte
  .byte=0
  .bit=1
 end if
common
 if .bit>1
  db .byte
 end if
}

21 Jan 2010, 06:17

Borsuc

Joined: 29 Dec 2005
Posts: 2465
Location: Bucharest, Romania

Borsuc 21 Jan 2010, 21:03

Pretty clever mask-handling revolution, but the name '.bit' is confusing seeing as the parameter is already called 'bit'... maybe '.mask' or '.pos' or '.index' or something would have been more clear at first sight (took me a while to figure it out). Smile

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21 Jan 2010, 21:03

edfed

Joined: 20 Feb 2006
Posts: 4350
Location: Now

edfed 12 Mar 2010, 17:10

it works, and i am happy!

edfed!

12 Mar 2010, 17:10

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