Re: Endianness macros capitalization

[Christian Franke]

Christian Franke wrote:
> Pavel Roskin wrote:
>   
> > On Tue, 2008-07-08 at 20:04 +0200, Christian Franke wrote:
> >
> >     
> > > With old gcc versions without the "rol" optimization, even the 16
> > > bit swap should be a function:
> > >
> > >       
> > Or better yet, an asm statement.
> >
> > We should consider optimized assembly vs function call.  Even the
> > 32-bit swap could be shorter:
> >
> > a:   86 c4                   xchg   %al,%ah
> > c:   c1 c0 10                rol    $0x10,%eax
> > f:   86 c4                   xchg   %al,%ah
> > 11:
> >
> > That's 7 bytes!  ...
> >     
>
> But the function call in the 32-bit case requires only 5 bytes :-)
>   

Sorry, I was wrong here. The assumption about function call size was 
only true for module-local calls. If a module calls a function in 
kernel, each 5 byte call requires another 8 bytes for the ELF relocation 
table entry.

Christian