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[interp] Intrinsify span ctor #39195

Merged
merged 4 commits into from
Jul 15, 2020
Merged

[interp] Intrinsify span ctor #39195

merged 4 commits into from
Jul 15, 2020

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BrzVlad
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@BrzVlad BrzVlad commented Jul 13, 2020

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ghost commented Jul 13, 2020

Tagging subscribers to this area: @BrzVlad, @lewurm
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@monojenkins monojenkins mentioned this pull request Jul 13, 2020
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@BrzVlad
[interp] Fix definition of instruction
5d2bd68
@BrzVlad
[interp] Intrinsify span ctor
0b226d5 
It is heavily used in bcl for static read only spans.

In the future we should do copy propagation through its fields so we avoid creating the span in the first place and remove other unecessary opcodes.
@BrzVlad
[interp] Allow method inlining if constructor is intrinsified
9768870
@BrzVlad
Fix case where has_references is not yet initialized
d4f6b0c
@SamMonoRT
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What kind of perf gain are we looking at with this change ?

@BrzVlad BrzVlad mentioned this pull request Jul 15, 2020
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@BrzVlad BrzVlad merged commit ef2ecfd into dotnet:master Jul 15, 2020
@steveharter
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I assume this would also help methods like Slice() since that returns a new Span.

@steveharter
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Here's a simple benchmark doing new Span<byte>(bytes).Slice() (100,000,000 iterations)

Core JIT Mono JIT Mono interpreter
23ms 652 (28x slower than Core) 7597 (330x slower than Core)

@ahsonkhan ahsonkhan mentioned this pull request Jul 26, 2020
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@karelz karelz added this to the 5.0.0 milestone Aug 18, 2020
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@vargaz vargaz vargaz approved these changes

@alexischr alexischr Awaiting requested review from alexischr

@CoffeeFlux CoffeeFlux Awaiting requested review from CoffeeFlux

@lambdageek lambdageek Awaiting requested review from lambdageek

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@BrzVlad @SamMonoRT @steveharter @vargaz @karelz @Dotnet-GitSync-Bot