The choice of compiler has a large impact on crc32c checksum performance in RocksDB.
smalldatum.blogspot.com/2022/04/clang-
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It does -- checked the output for clang 11 and 15
Allow me a dear lazyweb question.
Postgres uses crc32 or crc32c. Does this repro there?
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It's crc32c. A SSE 4.2 implementation is used where support exists, which is detected in a ticklish way:
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It has to be detected at runtime. In principle any individual DB installation could be moved to new hardware, with different capabilities.