Daniel Becker created IMPALA-8741:
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Summary: Speed up bit unpacking by vectorisation
Key: IMPALA-8741
URL: https://issues.apache.org/jira/browse/IMPALA-8741
Project: IMPALA
Issue Type: Improvement
Components: Backend
Reporter: Daniel Becker
Assignee: Daniel Becker
Using compiler intrinsics for SIMD and bit manipulation instructions (AVX, AVX2
and BMI2), we can speed up bit unpacking by a factor of about 2 to 8 depending
on bit width, at most 16.
We need to take care to check that the required instructions are supported by
the CPU the impalad is running on and fall back to the scalar implementation if
not.
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