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Avoid symbol interning in file_metadata. #60973

Merged
merged 1 commit into from
May 22, 2019
Merged

Avoid symbol interning in file_metadata. #60973

merged 1 commit into from
May 22, 2019

Commits on May 20, 2019

  1. Avoid symbol interning in file_metadata. 

    This commit changes `created_files` so it uses strings directly as keys,
rather than symbols derived from the strings. This avoids the cost of
having to do the hash table lookups to produce the symbols from the
strings.

The commit also uses `entry` to avoid doing a repeated hash table lookup
(`get` + `insert`).

Note that PR rust-lang#60467 improved this code somewhat; this is a further
improvement.
    @nnethercote
    nnethercote committed May 20, 2019
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