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Avoid unnecessary Span to ReadOnlySpan casts #34646
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bartonjs
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Jan 17, 2019
In a bunch of places we're creating a Span only to then cast it (generally implicitly) to a ReadOnlySpan. While the JIT is generally able to do the RightThing(tm), we can avoid the unnecessary IL and pressure on the JIT by just creating a ReadOnlySpan to begin with.
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ahsonkhan
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Jan 17, 2019
picenka21
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In a bunch of places we're creating a Span only to then cast it (generally implicitly) to a ReadOnlySpan. While the JIT is generally able to do the RightThing(tm), we can avoid the unnecessary IL and pressure on the JIT by just creating a ReadOnlySpan to begin with. Commit migrated from dotnet/corefx@ab92553
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In a bunch of places we're creating a Span only to then cast it (generally implicitly) to a ReadOnlySpan. While the JIT is generally able to do the RightThing(tm), we can avoid the unnecessary IL and pressure on the JIT by just creating a ReadOnlySpan to begin with.
Also cleaned up a few other minor span-related things as I was auditing, e.g. new Span(…).Slice(…) vs .AsSpan(…).
cc: @jkotas