Re: [PATCH-ppc 0/5] Add feature description for new VSX register set

["Joseph S. Myers" <joseph@codesourcery.com>]

On Fri, 25 Jul 2008, Thiago Jung Bauermann wrote:

> On Fri, 2008-07-25 at 21:01 +0000, Joseph S. Myers wrote:
> > On Fri, 25 Jul 2008, Luis Machado wrote:
> > > This is a patch series to enable POWER7 VSX register set support in GDB.
> > > The VSX registers' layout is as follows:
> > 
> > Will IBM be making appropriate proposals regarding these registers in the 
> > Power.org ABI working group?  The obvious things that need defining 
> > include DWARF debug/unwind information handling of the registers, and 
> > what's call-saved / call-clobbered, plus ABI handling of any new 
> > C-language datatypes.
> 
> Regarding call-saved / call-clobbered there's no option really. VSX
> registers follow the saved-ness of the registers they overlap with
> (either floating point or altivec).

So will some of the bits that don't overlap be call-saved?  If so, they 
need setjmp/longjmp support and unwind support, including in the signal 
unwind code in GCC.  I presume such patches to the other toolchain 
components will follow in due course if needed.

-- 
Joseph S. Myers
joseph@codesourcery.com