~/talk

Trivially Relocatable

on YouTube 08m
Talkat CppCon 2018 · 2018-09-23..09-28· [rust]

speaker

name:Arthur O'Dwyer
linkedin:arthur-odwyer

resources

video:https://youtu.be/xxta6LEn9Hk
slides:none on file

summary

Argument: certain types can be treated as bitwise-movable so relocation becomes a single memcpy instead of move-then-destroy loops. Demonstration: compiler experiments on Godbolt/Compiler Explorer with Clang experimental P1144 and a custom attribute plus the trait std::is_trivially_relocatable, and microbenchmarks with Google Benchmark. Result: reallocating vectors of pointer-like types (unique_ptr/shared_ptr) becomes 3x faster in reserve-heavy scenarios by relying on memcpy relocation rather than element-wise moves.

AI-written summary · about

chapters (5)

  1. 0:00Intro
  2. 0:13Motivating "relocation"
  3. 1:44Relocating trivially copyable types
  4. 2:53Relocating non-trivial types
  5. 4:54Benchmark results

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