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by jcranmer
2055 days ago
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> One thing LLVM bitcode still can’t do is retain information about preprocessor directives, eg any platform specific code for AVX2 vs SSE4 etc. LLVM supports per-function subtarget attributes, so you can compile individual functions with AVX2 support versus SSE4 support. The clang frontend even has a few different ways of triggering this support, with one method allowing you to specify per-CPU dispatch, and another merely specifying target attributes on a per-function basis. |
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