On Sun, 11 Apr 2010, Roman Divacky wrote:
On Sun, Apr 11, 2010 at 07:16:12PM +1000, Bruce Evans wrote:
.... However2, the system ALIGN() on
amd64 doesn't know the correct alignment either (both essentially had
64 bits hard-coded). Now xlint uses a different hard-coded alignment
(128 bits).
so you suggest fixing the ALIGN on amd64? ie. to make it 128bit?
It's an ABI change, thus needs careful release engineering. _ALIGN
(= ALIGN) is used in the CMSG ABI in <sys/socket.h> so I think would
affect public ABIs.
amd64 has a strict ABI which I think involves 128-byte alignment for
long doubles (not sure if it specifies anything for non-C things like
copies of SSE registers). The system should have a macro to support
the maximal alignment and it is easiest to use ALIGN() for this
(otherwise you would need a new macro for this and keep ALIGN() for
pointers and longs...).
Bruce
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