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[PR #10533] Improve parser performance by reducing tracing overhead #28099

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opened 2026-01-31 09:26:19 +00:00 by claunia · 0 comments
claunia commented 2026-01-31 09:26:19 +00:00
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Original Pull Request: https://github.com/microsoft/terminal/pull/10533

State: closed
Merged: Yes

Passing structures larger than the register size is very expensive
due to Microsoft's x64 calling convention. We could reduce the
overhead by passing the string-view by reference, but this forces us
to allocate the parameters as static string-views on the data
segment of our binary. I've found that passing them as classic
C-strings is more ergonomic instead and fits the need for
high performance in this particular code.
This improves performance for VT-heavy output by 15-20%.

PR Checklist

  • I work here
  • Tests added/passed
**Original Pull Request:** https://github.com/microsoft/terminal/pull/10533 **State:** closed **Merged:** Yes --- Passing structures larger than the register size is very expensive due to Microsoft's x64 calling convention. We could reduce the overhead by passing the string-view by reference, but this forces us to allocate the parameters as static string-views on the data segment of our binary. I've found that passing them as classic C-strings is more ergonomic instead and fits the need for high performance in this particular code. This improves performance for VT-heavy output by 15-20%. ## PR Checklist * [x] I work here * [x] Tests added/passed
claunia added the pull-request label 2026-01-31 09:26:19 +00:00
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Reference: starred/terminal#28099
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