------- Comment #14 from ubizjak at gmail dot com 2009-02-10 15:20 -------
> > OTOH, constraints should be used to support correct register > > allocation for machine instructions, not to emulate ABI in order to > > support calls from inside asm statements. > > Please indulge me for a moment. > > What exactly is a call? > > Are you considering the only method of transferring control to be the > standard 'near call' & 'near ret' instructions on the x86? I was referring at the procedure call, where you need to setup outgoing arguments on the calling point and setup incoming arguments on caller point. gcc will magically match these two no matter what ABI-changing compile flag (i.e. -mregparm) you use. When you call procedure from inside asm, gcc does not know about that, and there is no way that gcc will know where arguments are to be found. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16331
