good first bughelp wanted
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描述
The SIMD emulation occasionally drops to scalarized code. In addition to putting a bomb emoji in the doc, we can use something like __attribute__((diagnose_if(__EMSCRIPTEN_SIMD_🐌__ < 4, "💣", "warning")))__ to mark them in the header too. Clang would then emit warnings when a tagged function are called. Doing so might help developers with hunting down slow emulations.
Doc: https://clang.llvm.org/docs/AttributeReference.html#diagnose-if