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fmt of non-decimal radix untangled #143730

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fmt of non-decimal radix untangled #143730

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pascaldekloe
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Have the implementation match its decimal counterpart.

  • Digit table instead of conversion functions
  • Correct buffer size per radix
  • Elimination of dead code for negative
  • No trait abstraction for integers

Original Performance

    fmt::write_10ints_bin                                                393.03ns/iter      +/- 1.41
    fmt::write_10ints_hex                                                316.84ns/iter      +/- 1.49
    fmt::write_10ints_oct                                                327.16ns/iter      +/- 0.46

Patched Performance

    fmt::write_10ints_bin                                                392.31ns/iter      +/- 3.05
    fmt::write_10ints_hex                                                302.41ns/iter      +/- 5.48
    fmt::write_10ints_oct                                                322.01ns/iter      +/- 3.82

r? tgross35

@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-libs Relevant to the library team, which will review and decide on the PR/issue. labels Jul 10, 2025
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https://rust.godbolt.org/z/K1hWxa7dP

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bors commented Jul 17, 2025

☔ The latest upstream changes (presumably #144044) made this pull request unmergeable. Please resolve the merge conflicts.

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