Re: Adding more ppc64 buildds from the POWER cloud
On Tue, Apr 05, 2016 at 10:51:37AM +0200, Gabriel Paubert wrote:
> What is really missing in ppc-land is a variant which uses 32 bit
> addresses but otherwise knows that general purposes registers are
> 64 bit wide and can be used as such, i.e., an alternative 32 bit ABI
> which can only run on 64 bit processors and use 64 bit instructions
> when beneficial while not needing over 4GB of address space.
> (Truth be said, PPC code density is not great but much worse in
> 64 bit mode than in 32 bit mode).
Oh right the integer register width does change.
> I don't know for sure, but MIPS and/or Sparc may have something along
> these lines.
Well certainly mips has the old 32bit ABI, the 64 bit abi and the new
32 bit abi (64 bit instruction set and features running 32 bit mode).
Very much like x86, x64 and x32,