On Friday 25 August 2006 03:30, Dong Feng wrote:
> Sorry for perhaps extending the specific question to a more generic
> one. In which cases shall we, in current or future development,
> prevent gcc from knowing a pointer-addition in the way RELOC_HIDE? And
> in what cases shall we just write pure C point addition?
>
> After all, we are writing an OS in C not in pure assembly, so I am
> just trying to learn some generial rules to mimize the raw assembly in
> development.
In theory anything that is undefined in the C standard should be avoided
because gcc is free to make assumptions about it and generate unexpected
code.
In practice Linux does a lot of not-quite-legal-in-portable-C things
already, but tries to avoid areas that are known to have miscompiled in
the past.
Best is to avoid undefined behaviour in new code.
-Andi
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