Summary: This speeds up CRC computation significantly on hardware that supports it. Enabled via -msse4. Note: the binary won't be usable on older CPUs that don't support the instruction. Test Plan: crc32c_test Reviewers: dhruba Reviewed By: dhruba Differential Revision: https://reviews.facebook.net/D3201main
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* How to compile using fbcode and jemalloc |
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source fbcode.sh |
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make |
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* Compiling for CPUs with SSE4 support |
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make OPT='-O2 -DNDEBUG -msse4' |
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This makes CRC computation much faster, but |
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binaries won't run on CPUs that don't support it. |
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