Fix runtime AVX2 detection for checksum #501
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The way GCC implements function-multiversioning is to generate a dispatcher function, thus it could not be used when a function is not built by GCC (e.g. a direct .S file, in the situation of AVX2 checksum). Use function-multiversioning to declare a wrapper that will calls the appropriate checksum generatator function when AVX2 is present and do nothing when not present. Signed-off-by: Icenowy Zheng <[email protected]>
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The way GCC implements function-multiversioning is to generate a dispatcher function, thus it could not be used when a function is not built by GCC (e.g. a direct .S file, in the situation of AVX2 checksum).
Use function-multiversioning to declare a wrapper that will calls the appropriate checksum generatator function when AVX2 is present and do nothing when not present.