g++ 3.4.0 cygwin, codegen SSE & alignement issues

[DJ Delorie]

> I think a happy middle-way, at least for the i386 port, would be to
> implement a special function attribute, say __attribute__((align_stack)),
> that only dynamically aligns the stack of functions defined with the
> attribute.

The existing align-stack code is target independent.  Why not create a
target independent attribute?  The x86 isn't the only target that has
this problem, just the only one with an OS that makes it so obvious
(although Windows runs on various embedded chips also).