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Re: [mips] fix $gp restore bug
"Maciej W. Rozycki" <macro@linux-mips.org> writes:
> On Tue, 3 Mar 2009, Adam Nemet wrote:
>> Also, Richard's point is, that once you work out this sequence, you could use
>> it even if there is a GOT register instead of extending the lifetime of the
>> GOT register to all branches. But I agree, this latter point might be
>> something worthwhile to measure.
>
> For new ABIs I don't think you can get anywhere with -mxgot if $gp has
> not been stored in the prologue and GCC cannot allocate another register
> Would it be possible to do that for "big" functions unconditionally?
Just so that this doesn't go answered: I don't think -mxgot affects
things one way or the other. We use %got_page/%got_ofst for -mxgot
references to local symbols, just as we do for normal GOTs. And -mxgot
doesn't change the situations in which we decide we need (or don't need)
a global pointer.
Richard