Re: sti() does not work.

[Ralf Baechle <ralf@oss.sgi.com>]

On Thu, Jul 05, 2001 at 01:35:11PM +0200, Maciej W. Rozycki wrote:

> > > (why is noreorder used here?).
> > 
> > Without the .set noreorder the assembler would be free to do arbitrary
> > reordering of the object code generated.  Gas doesn't do that but there
> > are other assemblers that do flow analysis and may generate object code
> > that doesn't look very much like the source they were fed with.
> 
>  Hmm, I would consider that a bug in such an assembler.  The mtc0 and
> possibly the mfc0 opcode should be treated as reordering barriers as they
> may involve side effects an assembler might not be aware of. 

Assembler is the art of using sideeffects so things are fairly explicit.
Optimizations are controlled using

  .set noreorder / reorder
  .set volatile / novolatile
  .set nomove / nomove
  .set nobopt / bopt

  Ralf