RE: FW: Inline Assembler for PPC

["Martin Payne" <martin at microcosm dot co dot uk>]

So, it is impossible to get the value of r3 into a local variable?

> -----Original Message-----
> From: Ian Lance Taylor [mailto:ian@airs.com]
> Sent: 22 December 2004 20:44
> To: Martin Payne
> Cc: gcc-help@gcc.gnu.org
> Subject: Re: FW: Inline Assembler for PPC
> 
> 
> "Martin Payne" <martin@microcosm.co.uk> writes:
> 
> > Well, that same code does not work for me.
> > If I have this code:
> > 
> > main(int argc, char* argv[]) {
> > 	int i;
> > 	asm("stw %%r3, %0" : : "r" (i));
> > 
> > 	return 0;
> > }
> > 
> > and compile it by running:
> > 
> > gcc mytest.c
> > 
> > it gives the following output:
> > 
> > /var/tmp//ccOB6jdo.s:16:Parameter syntax error (parameter 1)
> > 
> > I am using gcc 3.3 20030304 by Apple, build 1666.
> 
> OK, that error is coming from the assembler, not the compiler.  Note
> that the file name is the .s file, not the .c file.
> 
> First I'll note that the error message is not from the mainline GNU
> assembler.  My understanding is that Apple uses an assembler based on
> very very old version of the GNU assembler.  I don't have access to
> any Apple development systems.
> 
> That said, the above C source code will generate something like this
> in the assembler file (you can check yourself by using the
> --save-temps option to get the assembler file):
>     stw %r3, 3
> That of course won't work.  The stw instruction doesn't expect the
> second parameter to be a register.
> 
> Ian
> 
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