Comments (5)
jkwak-work
commented on June 16, 2024
I was able to reproduce the issue with the latest DXC from github.
dxcompiler.dll: 1.8 - 1.8.0.14549 (main, 0781ded87)
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csyonghe
commented on June 16, 2024
We should file this bug with dxc to see if they can find out what exactly caused the slow down.
The amount of slow down seems pathological.
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jkwak-work
commented on June 16, 2024
I filed an issue on DXC github for the same issue.
https://github.com/microsoft/DirectXShaderCompiler/issues/6518
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jkwak-work
commented on June 16, 2024
I got an explanation from DXC github.
https://github.com/microsoft/DirectXShaderCompiler/issues/6512#issuecomment-2047992891
This has something to do with the fact that "inout" modifier on the global functions is "copy-in and copy-out" rather than a reference.
LLVM takes extra time to optimize it as if it was a reference.
On the other hand, "this" is a true reference for the member functions and that's why the compile time is faster.
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csyonghe
commented on June 16, 2024
For now we may be able to work around the issue by doing [ForceInline] on the member methods in Slang.
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