[PATCH], Pr 71667, Fix PowerPC ISA 3.0 DImode Altivec load/store

Segher Boessenkool segher@kernel.crashing.org
Tue Jun 28 17:57:00 GMT 2016


On Tue, Jun 28, 2016 at 01:27:45PM -0400, Michael Meissner wrote:

<snip>

Thanks for the explanation.

> I think the thing to do is create yet another memory constraint, that is just
> an offsetable address, with the bottom 2 bits 0, and no PRE_MODIFY, etc.

That sounds best yes.  The current patch seemed fragile and a bit
confusing / surprising to me, but you now found an actual problem as
well.

> > 20599 lines, can you minimize this a bit?  If not, maybe we should just
> > do without testcase here.
> 
> I doubt I could minimize it, since it is only this one source so far that has
> shown to be failure.  I can delete it if you prefer.

Huge testcases for simple problems does not really scale.


Segher



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