dotnet/roslyn
No ReadOnlySpan<byte> static data optimization for new byte[N]
Aberta
#33.088 aberto em 4 de fev. de 2019
Area-CompilersFeature Requesthelp wanted
Métricas do repositório
- Stars
- (20.414 estrelas)
- Métricas de merge de PR
- (Mesclagem média 6d 17h) (256 fundiu PRs em 30d)
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.