From: brennan AT mack DOT rt66 DOT com (Brennan "The Rev. Bas" Underwood)
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Bitwise ASM with DJGPP GCC
Date: 18 May 1997 17:52:06 -0600
Organization: Acid Brain
Lines: 35
Distribution: world
Message-ID: <5lo4n6$apu$1@mack.rt66.com>
References: <1997051321301977565 AT zetnet DOT co DOT uk>
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To: djgpp AT delorie DOT com
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In article <1997051321301977565 AT zetnet DOT co DOT uk>,
Keith Hull  <keithh AT zetnet DOT co DOT uk> wrote:
>Hi everyone,
>
>I would like some help with GCC and inline asm (i've looked at 
>Brennan's Guide to Inline ASM - it seems to make sense ;) .... heres 
>my problem..
>
>asm ("rorl _val, _num_of_rotates");
>asm ("roll _val, _num_of_rotates");
>asm ("sall _val, _num_of_rotates");
>asm ("sarl _val, _num_of_rotates");
>asm ("shll _val, _num_of_rotates");
>asm ("shrl _val, _num_of_rotates");
>
>none of the above statements compile under GCC!! They seem to have a 
>problem with the first operand! 
>
>Can anyone shed any light, i'm completely baffled.

You can't have that many memory operands, and you have them backwards.

You could have done "rorl $4, _val" or "rorl %cl, _val".

movb _num_of_rotates, %cl
rorl %cl, %ecx

Would do what I think you want.


Brennan
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