From: bukinm AT inp DOT nsk DOT su (Michael Bukin)
Newsgroups: comp.os.msdos.djgpp
Subject: Re: At inline assemble..
Date: Mon, 21 Apr 1997 07:20:36 GMT
Organization: BINP SD RAS
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References: <5jel72$d9q$1 AT usenet DOT kornet DOT nm DOT kr>
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On 21 Apr 1997 02:59:46 GMT, doing AT soback DOT kornet DOT nm DOT kr wrote:

> Hi,
> 
> I use many inline assembly, but I got trouble with '-O3' option.
> My inline assemble functions are working well With -O2 or -O1.
> 
> void Test( int count )
> {
> __asm__ ( "
> MyLoop:
>         LOOP MyLoop"
>         : : "g" (count) : "cx" );
> }
> 
> int main( int argc, char *argv[] )
> {
>         Test( 1 );
>         Test( 2 );
> }

  With `-O3' `Test' is inlined and this will result in
`MyLoop' label defined twice in `main', which is not
acceptable by assembler. Use `.' for referencing
current address.
  Also, load `count' into ecx explicitely
(use "c" instead of "g").

inline void
Test (int _count)
{
  __asm__ volatile ("loop ."
                    : : "c" (_count) : "%ecx");
}

Look at generated assembler input with gcc -S