Remove local optimizations #4799
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OlivierBlanvillain
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Here are the results, each experiment consists of 40 forks of 10 warmups
and 20 measurements each (that's what it takes to get ~30ms precision!):
ConstantFold 12672.914 ± 29.044 ms/op
InlineLocalObjects 12742.463 ± 29.693 ms/op
DropNoEffects 12717.516 ± 28.266 ms/op
DropGoodCasts 12753.709 ± 31.020 ms/op
Jumpjump 12758.874 ± 28.979 ms/op
Devalify 12820.393 ± 29.601 ms/op
Valify 12732.851 ± 29.466 ms/op
InlineOptions 12705.638 ± 29.186 ms/op
RemoveUnnecessaryNullChecks 12740.366 ± 29.604 ms/op
InlineCaseIntrinsics 12675.068 ± 29.075 ms/op
Not Optimized 12731.068 ± 28.731 ms/op
All Optimizations 12762.053 ± 28.751 ms/op
Also here a count of how many time each optimization modifies a tree
when bootstrapping (running all of them together):
20688 Devalify
7165 DropNoEffects
2787 InlineCaseIntrinsics
1340 ConstantFold
728 DropGoodCasts
76 InlineOptions
49 InlineLocalObjects
16 RemoveUnnecessaryNullChecks
3 Jumpjump
Here are some additional numbers obtained using the Scala Native
benchmarks:
https://plot.ly/~olivierblanvillain/1/#plot
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| val yCheckOptions = Array("-Ycheck:all") | ||
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| val basicDefaultOptions = checkOptions ++ noCheckOptions ++ yCheckOptions | ||
| val defaultUnoptimised = TestFlags(classPath, runClassPath, basicDefaultOptions) |
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Rename defaultOptions?
allanrenucci
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Jul 18, 2018
Also remove defaultUnoptimised
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@liufengyun Can you update the benchmarks once this is merged? |
allanrenucci
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After scala/scala3#4799, a build spawns 2 jobs instead of 3. So we can increase the number of parallel builds.
This was referenced Jul 18, 2018
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This PR removes the local optimizations, as discussed in the last meeting. To summarize:
The performance improvements are too small (and inconsistent) compared to the additional compilation cost
With the plan to reuse the scalac backend in dotty, it makes little sense to have similar optimizations earlier in the pipeline
We are currently spending 1/3 of the CI time on testing this code