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joaquintides
2022-11-27 19:39:07 +01:00
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doc/unordered/buckets.adoc
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@ -280,7 +280,7 @@ bucket), and an _overflow byte_ (_ofw_ in the diagram). The value of _h_~_i_~ is
When looking for an element with hash value _h_, SIMD technologies such as
https://en.wikipedia.org/wiki/SSE2[SSE2] and
https://en.wikipedia.org/wiki/ARM_architecture_family#Advanced_SIMD_(Neon)[Neon] allows us
https://en.wikipedia.org/wiki/ARM_architecture_family#Advanced_SIMD_(Neon)[Neon] allow us
to very quickly inspect the full metadata word and look for the reduced value of _h_ among all the
15 buckets with just a handful of CPU instructions: non-matching buckets can be
readily discarded, and those whose reduced hash value matches need be inspected via full
@ -299,7 +299,7 @@ and when going past a full group its corresponding overflow bit is set to 1.
In architectures without SIMD support, the logical layout stays the same, but the metadata
word is codified using a technique we call _bit interleaving_: this layout allows us
to emulate SIMD with reasonably good performance using only standard arithmetic and
logical operations .
logical operations.
[#img-foa-metadata-interleaving]
.Bit-interleaved metadata word.