go/doc/next/6-stdlib/6-testing-bloop.md

New benchmark function

Benchmarks may now use the faster and less error-prone [testing.B.Loop] method to perform benchmark iterations like for b.Loop() { ... } in place of the typical loop structures involving b.N like for i := n; i < b.N; i++ { ... } or for range b.N. This offers two significant advantages:

• The benchmark function will execute exactly once per -count, so expensive setup and cleanup steps execute only once.
• Function call parameters and results are kept alive, preventing the compiler from fully optimizing away the loop body.