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Isn't DllImport slow? #27

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Shadowblitz16 opened this issue Dec 2, 2021 · 1 comment

Shadowblitz16 commented Dec 2, 2021

Isn't DllImport slow?
Would this even be viable for os dev?

Owner

MichalStrehovsky commented Dec 2, 2021

You can see for yourself in the disassembly.

This line:

zerosharp/no-runtime/build.cmd

Line 38 in 186dc16

    
           %ILCPATH%\ilc zerosharp.ilexe -g -o zerosharp.obj --systemmodule zerosharp --map zerosharp.map -O --directpinvoke:kernel32 || goto Error

(--directpinvoke:kernel32)

makes all DllImports statically bound. They have the same overhead as an extern DllImport in C (they go through a single jmp instruction on x64).

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