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Re: [discuss] When is RBX used for base pointer?
On Wed, 13 Feb 2008, H.J. Lu wrote:
> Our proposal is at
> For most cases, we can align stack with RBP/RSP. But
> we need an extra register when there is dynamic stack
> allocation or nested functions. It has to be callee-saved
> to work with setjmp/longjmp.
I'm probably missing something, but why does it have to be a fixed
register at all? Why not simply saying "a free callee-saved register"?