== This week ==
* Applied patch for doing NEON high/low extraction using subregs.
Ramana pointed out that we do the same thing for insertion,
so I wrote a patch to handle that too. Both now merged into
Linaro sources.
* Looked at ARM bootstrap problem on trunk. Turned out to be
an aliasing problem. Submitted and applied patch.
* Reworked part of my SMS register-scheduling patch after feedback
from Ayal. Submitted new version upstream.
* Got SPEC2006 running on the powerpc boxes and tested one part
of my -fsched-pressure patch. Bit of a mixed bag. h264ref was
one of the worst sufferers, which was a bit worrying. I think
I'll need to make a third change too.
To recap, there are two pieces now:
1) Make -fsched-pressure honour the DFA
2) Make -fsched-pressure allow values that are live across a
loop to be spilled.
I naively hoped that (1) would be OK on its own, but h264 shows
that the current -fsched-pressure code is very conservative
when it comes to large blocks. It only considers register
deaths once there is a single remaining use; if there are two
unscheduled uses, it assumes that the register remains live
for the rest of the block.
So the problem that (1) was fixing was that -fsched-pressure was too
optimistic in terms of what it could schedule in a cycle. But with
that fixed, we seem to have too many sources of pessimism...
Richard
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