On Wed, Jun 07, 2006 at 06:43:50PM +0200, Sandro Tolaini wrote: > > On 07/giu/2006, at 18:22, H. J. Lu wrote: > > >The x86 psABI is very old and doesn't cover XMM registers. I'd like to > >update x86 Linux calling convention for XMM register usage. I am not > >sure if I should update stack alignment requirement. > > Maybe you'll want to check how this is handled in Darwin/x86, which > requires 16-byte stack alignment because it is internally using XMM > registers. >
They try to support 4byte alignment legacy code with http://gcc.gnu.org/ml/gcc-patches/2006-05/msg00526.html There are 2 different, but related questions: 1. Should Linux require gcc generates 16byte aligned stack? 2. How should Linux support 4byte alignment code? H.J. H.J.
