dotnet/roslyn
No ReadOnlySpan<byte> static data optimization for new byte[N]
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#33 088 ouverte le 4 févr. 2019
Area-CompilersFeature Requesthelp wanted
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- (Merge moyen 6j 17h) (256 PRs mergées en 30 j)
Description
Version Used: dotnet 2.2.200-preview-009748
Steps to Reproduce:
Declare a static ReadOnlySpan<byte> property of the form:
public class C
{
public static ReadOnlySpan<byte> StaticData => new byte[] { 0 };
public static ReadOnlySpan<byte> DoesntWork => new byte[1];
}
Expected Behavior:
Per the optimisation in #24621, I expected that both StaticData and DoesntWork would be compiled to a reference to static data, e.g., new ReadOnlySpan<byte>(&global::<PrivateImplementationDetails>.5BA93C9DB0CFF93F52B521D7420E43F6EDA2784F, 1);
Actual Behavior:
Only StaticData has the implementation optimisation; DoesntWork doesn't, even though it has the exact same data. The problem is more noticeable with an expression like new byte[1000], where you might not want to type out 1000 literal zero bytes in source code.