[coreboot] [PATCH] Add VIA VT8237S support
stepan at coresystems.de
Wed Sep 10 22:46:43 CEST 2008
ron minnich wrote:
> On Wed, Sep 10, 2008 at 1:37 PM, Stefan Reinauer <stepan at coresystems.de> wrote:
>> Just curious:
>> Why would you say packed is asking for trouble?
> it's actually burned me in the past, but I am fine with it when
> needed. It's not needed for sysinfo for example. Some of our uses seem
> There are cases where people naively used packed and ended up slowing
> down the programs by several orders of magnitude (on alpha for
> The Xen guys used it at first and then removed it. It's worth avoiding
> if you can.
Absolutely. The only reason to use it is when
a) reading from binary files directly into a struct
b) using a struct to access hardware
When GCC adds padding to the struct, it does that to increase speed when
accessing the members by removing the need to do slow, unaligned accesses.
That said, using it for sysinfo sounds like a bad idea, unless writing
sysinfo and reading it again is done by 2 different compilers.
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