Wes McKinney created ARROW-3242:
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Summary: [C++] Use coarser-grained dispatch to SIMD hash functions
Key: ARROW-3242
URL: https://issues.apache.org/jira/browse/ARROW-3242
Project: Apache Arrow
Issue Type: Improvement
Components: C++
Reporter: Wes McKinney
Fix For: 0.11.0
The way that we dispatch to SSE4 hash functions is a remnant from the Impala
codebase, which checks CpuInfo on every iteration in debug builds:
https://github.com/apache/arrow/blob/master/cpp/src/arrow/util/hash-util.h#L43
However, the static {{model_name_}} member is causing some non-determinism
related to static member lifetime as reported in ARROW-3241.
I'm proposing to refactor CpuInfo into a singleton pattern and handle SIMD vs
non-SIMD dispatch at a higher level rather than at the lowest level like it is
now. This should hopefully make the issue in ARROW-3241 go away
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