Messages in this thread | | | From | Andi Kleen <> | Subject | Re: Segfault on the i386 enter instruction | Date | Mon, 15 May 2006 13:46:21 +0200 |
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> http://groups.google.co.nz/groups?selm=7i86ni%24b7n%241%40palladium.transmeta.com
Linus' reasoning is actually outdated - on most modern x86s it is not slower than the expanded code sequence because it will generate the same number of macro/u-ops. But it would be still extremly ugly to implement, which is a good reason not to.
> And perhaps x86-64 is handled different because of the red zone (some > memory below the stack-pointer that can be accessed legally)?
Yes, but it's only 128 bytes so it won't help for larger frames. It will also work if you preextended the stack before, but i wouldn't rely on it.
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