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optimizer: run SROA multiple times to handle more nested loads #43267

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optimizer: run SROA multiple times to handle more nested loads #43267

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  • benchmark that this doesn't incur much compile-time overhead
  • update the description of the algorithm

@nanosoldier runbenchmarks("broadcast" || "sparse" || "array" || "union", vs=":master")

@aviatesk aviatesk added the compiler:optimizer Optimization passes (mostly in base/compiler/ssair/) label Nov 30, 2021
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@nanosoldier runbenchmarks("broadcast" || "sparse" || "array" || "union", vs=":master")

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Keno commented Nov 30, 2021

I'm somewhat worried about the compile-time impact of this. Can we do something more precise than rerunning the whole pass?

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Rerun only happens when there are nested getfield(getfield(mutable)) calls and getfield(mutable) is eliminated, so it doesn't happen often. I confirmed this doesn't change TTFP for example, but I'm also working on implementing a simple suite for benchmarking Julia-level compilation pipeline and I hope I can get something back based on it.

Base automatically changed from avi/43254 to master December 2, 2021 05:37
@aviatesk aviatesk marked this pull request as ready for review December 2, 2021 05:42
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aviatesk commented Dec 2, 2021

@nanosoldier runbenchmarks("broadcast" || "sparse" || "array" || "union" || "string" || "tuple", vs=":master")

@aviatesk aviatesk force-pushed the avi/multisroa branch 2 times, most recently from fb5e715 to ca42b56 Compare December 9, 2021 04:57
@aviatesk aviatesk force-pushed the avi/multisroa branch 4 times, most recently from 6e25433 to 8872cd6 Compare December 20, 2021 17:37
@aviatesk aviatesk added the needs nanosoldier run This PR should have benchmarks run on it label Dec 21, 2021
@aviatesk aviatesk force-pushed the avi/multisroa branch 3 times, most recently from dd6d086 to 250059f Compare December 23, 2021 05:57
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aviatesk commented Jan 5, 2022

@nanosoldier runbenchmarks("broadcast" || "sparse" || "array" || "union" || "string" || "tuple", vs=":master")

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Your benchmark job has completed - possible performance regressions were detected. A full report can be found here.

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aviatesk commented Jan 5, 2022

@nanosoldier runbenchmarks(!("scalar"), vs=":master")

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Your benchmark job has completed - possible performance regressions were detected. A full report can be found here.

@aviatesk aviatesk mentioned this pull request Jan 21, 2022
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compiler:optimizer Optimization passes (mostly in base/compiler/ssair/) needs nanosoldier run This PR should have benchmarks run on it
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@aviatesk @Keno @nanosoldier