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When use the legacy compiler and when upgrade to new compiler?

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When compiling shaders/effects with either fxc.exe or the API functions one can specify to use the legacy compiler (fxc switch /LD or API flag D3DXSHADER_USE_LEGACY_D3DX9_31_DLL).

So in what cases does it make sense to upgrade your shader/effects code which previously has been running in legacy mode to be compiled in the new compiler version (but still under DX9)?

I mean, besides compiler optimization stuff such as attributes like [unroll] or [loop], what are my benefits if I decided to take the effort to make my code compatible with the new compiler? Do I have more / better functions where I could use or something? Edited by Meltac

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