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`reinterpret(Type, v)` performance degrades with `-O1` #57228

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NHDaly opened this issue Jan 31, 2025 · 0 comments

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NHDaly commented Jan 31, 2025

$ julia -O2 -e 'using BenchmarkTools; @btime reinterpret.(NTuple{48,UInt8}, $([(UInt128(1), UInt128(2), UInt128(3)) for _ in 1:1000]));'
  2.719 μs (2 allocations: 46.92 KiB)

$ julia -O1 -e 'using BenchmarkTools; @btime reinterpret.(NTuple{48,UInt8}, $([(UInt128(1), UInt128(2), UInt128(3)) for _ in 1:1000]));'
  15.292 μs (2002 allocations: 171.92 KiB)

We are discussing to extend bitcast to support non-padded (packed) isbits types, and switching to that instead.
Draft PR for that here: #57227.

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