macro neg ?

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Roman

Joined: 21 Apr 2012
Posts: 1938

Roman 09 May 2025, 02:29

fasmw 1.73 have neg for macro ?

Code:


v = -1
b = neg v ;=1

09 May 2025, 02:29

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20625
Location: In your JS exploiting you and your system

revolution 09 May 2025, 02:49

Code:

b = -v

09 May 2025, 02:49

Roman

Joined: 21 Apr 2012
Posts: 1938

Roman 09 May 2025, 02:58

I do.
b = not (v)+1

This variant correct?

09 May 2025, 02:58

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20625
Location: In your JS exploiting you and your system

revolution 09 May 2025, 04:48

If v is an EQU then use:

Code:

b = -(v)

09 May 2025, 04:48

a

Joined: 10 Apr 2025
Posts: 17
Location: Ukraine

a 09 May 2025, 23:15

This code does work:

Code:

mov eax, not 1

However, this one does not:

Code:

a = not 1

Apparently, this feature is undocumented. I wonder how many more hidden features fasm has, it would be nice if someone would make a list of undocumented features.

09 May 2025, 23:15

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20625
Location: In your JS exploiting you and your system

revolution 10 May 2025, 00:28

What do you mean by "does not work"?

Code:

mov eax, not 1
a = not 1
db a
dw a
dd a
dq a

$ fasm test.asm 
flat assembler  version 1.73.31  (16384 kilobytes memory)
1 passes, 21 bytes.

$ hd test.bin 
00000000  66 b8 fe ff ff ff fe fe  ff fe ff ff ff fe ff ff  |f...............|
00000010  ff ff ff ff ff                                    |.....|
00000015

10 May 2025, 00:28

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