[Impeller] use string view for labels in more places to defer allocatons. #49905
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It looks like this pull request may not have tests. Please make sure to add tests before merging. If you need an exemption to this rule, contact "@test-exemption-reviewer" in the #hackers channel in Chat (don't just cc them here, they won't see it! Use Discord!). If you are not sure if you need tests, consider this rule of thumb: the purpose of a test is to make sure someone doesn't accidentally revert the fix. Ask yourself, is there anything in your PR that you feel it is important we not accidentally revert back to how it was before your fix? Reviewers: Read the Tree Hygiene page and make sure this patch meets those guidelines before LGTMing. |
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| void CommandEncoderVK::PushDebugGroup(const char* label) const { | ||
| void CommandEncoderVK::PushDebugGroup(std::string_view label) const { | ||
| if (!HasValidationLayers()) { |
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This is basically the improvement, since the labels are invisible if there are no validation errors, moving the allocation below means most of the time (benchmarks) they wont even be allocated.
| std::string label_copy(label); | ||
| vk::DebugUtilsLabelEXT label_info; | ||
| label_info.pLabelName = label; | ||
| label_info.pLabelName = label_copy.c_str(); |
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You should be able to just use the label directly.
label_info.pLabelName = label.data();
Having an extra copy on the stack isn't really helping.
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Oh duh, thanks!
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test-exempt: non-semantic refactor (reduces string allocation). |
jonahwilliams
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…141916) flutter/engine@a9b87c6...53a2436 2024-01-20 [email protected] [Impeller] use string view for labels in more places to defer allocatons. (flutter/engine#49905) If this roll has caused a breakage, revert this CL and stop the roller using the controls here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll Please CC [email protected],[email protected],[email protected] on the revert to ensure that a human is aware of the problem. To file a bug in Flutter: https://github.com/flutter/flutter/issues/new/choose To report a problem with the AutoRoller itself, please file a bug: https://issues.skia.org/issues/new?component=1389291&template=1850622 Documentation for the AutoRoller is here: https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md
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This improves the performance of command encoding when there is no debugger attached. most labels are const char*, and so by accepting a string_view we can avoid actually creating a string if validations are disabled.