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I was hoping most of the program generator would get inlined, so we can
resolve a lot of the edge cases at compile-time. This patch gets us
close to that, adding many inline attrs and rewriting RegisterSet with
explicit unrolling and storage types that are easier for the optimizer
to reason about.
From the disassembly of the program generator, it's now mostly one big
function with a jump table. From callgrind instruction profiles, there
are no longer obvious hotspots in register set scanning loops. It also
looks like we're often keeping per-register schedule information all
loaded into machine registers now.
Keeping the Rng entry points non-inlined for now seems to be slightly
better, by a percent or two.
There's some work left to do in compiled programs, and maybe room for
improvement in the Program representation too. That will be in a future
patch.
Benchmark shows about 20% improvement on my machine,
generate-interp time: [75.440 µs 75.551 µs 75.684 µs]
change: [-24.083% -23.775% -23.483%] (p = 0.00 < 0.05)
Performance has improved.
Found 11 outliers among 100 measurements (11.00%)
5 (5.00%) high mild
6 (6.00%) high severe
generate-x86_64 time: [96.068 µs 96.273 µs 96.540 µs]
change: [-18.699% -18.381% -18.013%] (p = 0.00 < 0.05)
Performance has improved.
Found 10 outliers among 100 measurements (10.00%)
4 (4.00%) high mild
6 (6.00%) high severe
Signed-off-by: Micah Elizabeth Scott <[email protected]>
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