KeyPath performance improvement: Omit projection across trivially-typed memory.#60758

Merged

jckarter merged 14 commits intoswiftlang:mainfrom

fibrechannelscsi:faster-keypaths

Nov 1, 2022

Commits on Oct 20, 2022

Proposed design for skipping of KeyPath projections across trivially-typed memory.
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Clarified a comment in isTuple().
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ABI stability fix: isPureStructKeyPath should be internal.
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KeyPath offset tests were breaking on Ubuntu 20.04. It's possible _storedInlineOffset wasn't factored out correctly.
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Moved computation of offset for pureStructKeyPaths into KeyPathPatternVisitors.
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Fixed the failing unit tests in capture_propagate_keypath.swift.
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Fixed .unresolvedFieldOffset should count as an optimized offset. Restored optimization for KeyPath writes.
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Modified storage of valid offsets in assignOffsetToStorage() and getOffsetFromStorage().
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Use Int(bitPattern) rather than distance(to) to compute the offset.
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Commits on Oct 24, 2022

Added missing instances of pureStruct information propagation.
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Commits on Oct 26, 2022

Revised _tryToAppendKeyPaths(). Removed two instances of isPureStruct.append() that weren't needed.
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Commits on Oct 28, 2022

Commits on Oct 31, 2022

Removed an unnecessary disabling of isPureStruct.
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