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randomdude



Joined: 01 Jun 2012
Posts: 83
randomdude
i need to use ror/rol in a macro but it doesnt seem to be supported

then i found this

ror = x * 2^y + x / 2^(32-y)
rol = x / 2^y + x / 2^(32-y)

but ^ is also not supported Shocked

is there any workaround?
Post 27 Apr 2013, 16:38
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bitRAKE



Joined: 21 Jul 2003
Posts: 2937
Location: vpcmipstrm
bitRAKE
Code:
struc _ROR val {
 . = ((. shr val) + (. shl (32-val))) and $FFFFFFFF
}
struc _ROL val {
 . = ((. shl val) + (. shr (32-val))) and $FFFFFFFF
}

happy = $19730905
joyjoy = $CAFEBABE
happy _ROR 14
joyjoy _ROL 10
dd happy,joyjoy    
...maybe you can use?

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Post 27 Apr 2013, 16:48
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randomdude



Joined: 01 Jun 2012
Posts: 83
randomdude
thanks bitRAKE, but it doesnt seem to do the same than ror/rol

i cant use those strucs in my macro (error extra characters on line) so i did this:
_char = ((_char shr 3) + (_char shl (32-3))) and 0xFF

but the result is different than using ror/rol :S
Post 27 Apr 2013, 17:46
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bitRAKE



Joined: 21 Jul 2003
Posts: 2937
Location: vpcmipstrm
bitRAKE
Need to add more masking to clamp values? I didn't test it, but the general idea is sound. If you are only working with characters then it would be:

_char = ((_char shr 3) + (_char shl (8-3))) and 0xFF

The size of the values being operated on is important.

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¯\(°_o)/¯ unlicense.org
Post 27 Apr 2013, 18:01
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randomdude



Joined: 01 Jun 2012
Posts: 83
randomdude
thanks a lot! works great =)
Post 27 Apr 2013, 18:28
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