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From:	challier AT news DOT irit DOT fr (Jean-Marc CHALLIER)
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: DJGPP: Inline assembly?
Date:	19 Dec 1995 10:55:09 GMT
Organization:	IRIT-UPS, Toulouse, France
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To:	djgpp AT delorie DOT com
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Andy Molyneux (molyneua AT cs DOT man DOT ac DOT uk) wrote:
: Trouble is, this doesn't let you refer to local variables or parameters 
: passed to the current function (which I believe BCC's asm{} does) and the 
: assembler syntax requires operands "backwards" amongst other bizarre 
: features.

Sorry, but it DOES let you do it, and moreover, you can put not only
variables but ANY VALID C-EXPRESSION inside the `()'. Please DO take a
further look at the info file I mentioned earlier. Here is a (silly)
example I can think of ; sorry I didn't compile it, but I'm at work at
the moment :

int   trigger;

int isTriggerPlus2(int i) {
  register int result asm("eax");

  asm(	"
	movl	%1, %%edx
	cmpl	%2, %%edx
	setnel	%0
	" : "=r" (result) : "g" (i), "g" (trigger+2) : "edx");
}

I know it is REALLY silly, but it's an example of what can be put
between the `:'.

	I know the syntax is not the same as Intel's assembly, but it
DOES allow you to do ASM constructs in a C-source file.

.... hope this helps...

			Igx, The dreaming drummer...

-----------------------------------------------------------------------------
Igx, The dreaming drummer... in real(???) life : Jean-Marc CHALLIER
email : challier AT irit DOT fr		| J-M CHALLIER,
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	31000 Toulouse - FRANCE		| 31400 Toulouse - FRANCE
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