[qt/clang/llvm]: Summary of bulk changes made

Git repository change summary for qt/clang/llvm
Pushed by mirror-service into branch 'upstream/users/arsenm/mc-cpu-alias-compact-table'.
Changed from 7e13f6dde4df3c2af1e11caf52c4b0be21a5ca2e to a6d9e7e1c861ffb7655e27f0bba9c309597c2431
Acknowledgement was received that this change introduces only existing code that has been pushed to another public open source repository.

This change contains the following new commits:

Git commit 4792e5407dca4738bac3adab0d0bb0fd562b9e96 by Matt Arsenault on 25/07/2026 at 06:17..
TableGen: Add first class support for processor aliases

Previously isCPUStringValid was virtual so TableGen could emit an
AArch64 specific hack for recognizing cpu aliases. Teach tablegen
about aliases, and insert each alias into the CPU subtype table as its
own entry (sorted by name, carrying the canonical processor's features
and scheduling model).

There is further opportunity for code sharing improvements. AArch64's
aliases are consumed by ARMTargetDefEmitter to emit a custom inc file
in TargetParser which should be universalized.

Co-authored-by: Claude (Claude-Opus-4.8) <[email protected]>
https://invent.kde.org/qt/clang/llvm/-/commit/4792e5407dca4738bac3adab0d0bb0fd562b9e96

Git commit 38f619ca4ed84729524ed3993dd1a6c4bc70ff15 by Matt Arsenault on 25/07/2026 at 06:18..
TableGen: Use a compact table for CPU aliases

Previously each ProcessorAlias was emitted as a full SubtargetSubTypeKV
entry in the processor subtype table, duplicating the canonical
processor's feature masks and scheduling model index. At 104 bytes per
entry: AArch64's 18 aliases added ~1.8KB, and X86 will add more as aliases
are introduced.

Emit aliases into a separate SubtargetSubTypeAliasKV table instead. Each
alias is just a name string offset plus the index of the canonical
processor it resolves to.

Co-authored-by: Claude (Claude-Opus-4.8) <[email protected]>
https://invent.kde.org/qt/clang/llvm/-/commit/38f619ca4ed84729524ed3993dd1a6c4bc70ff15

Git commit a6d9e7e1c861ffb7655e27f0bba9c309597c2431 by Matt Arsenault on 25/07/2026 at 06:25..
sort
https://invent.kde.org/qt/clang/llvm/-/commit/a6d9e7e1c861ffb7655e27f0bba9c309597c2431