[head tinderbox] failure on mips/mips
M. Warner Losh
imp at bsdimp.com
Tue Feb 17 23:00:55 PST 2009
In message: <B23797BE-91FB-4AE1-8370-E77D66ED05B6 at mac.com>
Marcel Moolenaar <xcllnt at mac.com> writes:
: On Feb 17, 2009, at 10:42 PM, M. Warner Losh wrote:
: > : A safer approach is to mark ifi_epoch as packed or put differently,
: > : define time_t as a 64-bit integral with 32-bit alignment. This can
: > : avoid a lot of unexpected internal padding as well (e.g. struct
: > : timeval).
: > Marking it as packed won't help. If the elements aren't properly
: > aligned, gcc won't access multi-word entities properly. It might
: > eliminate the warning, but it will break at runtime.
: But GCC will use a pair of 32-bit loads and/or stores to
: access the 64-bit integral in that case. There should be
: no runtime breakage. You only do this for n32 of course.
Why only n32? Registers are still 64-bit in n32.
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