Hi André,
On 14/08/13 15:07, André Hentschel wrote:
Hi Jonathan,
Any updates on this?
I was holding out to see the version with ldrd at the top, as discussed
below - I never saw a version with that change? I'd meant to ping you to
see if that was coming, sorry.
[...]
[...]
Now we've only got one instruction between the store and the load
and risk stalling the pipeline...
Dave M cautiously says "The ancient advice was that one instruction
was enough" but this is very core dependent... I wonder if anyone
has a good idea about whether this is an issue here...?
We could use a ldrd at the top, that'd be nearly what we have right
now, don't we?
Yea, that'd be good - as far as I can see from an 1136 TRM, the ldrd *may* be
two cycles (depending on alignment of the words) but the ldr and ldrne will
always be two cycles. Ahhh, the joys of modifying the fast path ;)
Was expecting to see something that reflected this discussion,
Jonny
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