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[PR #11725] Introduce new TIL string helpers, teach older ones to use wmemcmp #28721

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opened 2026-01-31 09:30:21 +00:00 by claunia · 0 comments
claunia commented 2026-01-31 09:30:21 +00:00
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Original Pull Request: https://github.com/microsoft/terminal/pull/11725

State: closed
Merged: Yes

til::equals:
At the time of writing wmemcmp() is not an intrinsic for MSVC,
but the STL uses it to implement wide string comparisons.
This produces 3x the assembly per comparison and increases
runtime by 2-3x for strings of medium length (16 characters)
and 5x or more for long strings (128 characters or more).
See: https://github.com/microsoft/STL/issues/2289

Additionally a number of case insensitive, locale unaware
helpers for prefix/suffix comparisons are introduced.

**Original Pull Request:** https://github.com/microsoft/terminal/pull/11725 **State:** closed **Merged:** Yes --- til::equals: At the time of writing wmemcmp() is not an intrinsic for MSVC, but the STL uses it to implement wide string comparisons. This produces 3x the assembly _per_ comparison and increases runtime by 2-3x for strings of medium length (16 characters) and 5x or more for long strings (128 characters or more). See: https://github.com/microsoft/STL/issues/2289 Additionally a number of case insensitive, locale unaware helpers for prefix/suffix comparisons are introduced.
claunia added the pull-request label 2026-01-31 09:30:21 +00:00
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Reference: starred/terminal#28721
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