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

Git repository change summary for qt/clang/llvm
Pushed by mirror-service into branch 'upstream/users/jerryyin/amdgpu-isreallyaclobber-aa'.
Changed from 0000000000000000000000000000000000000000 to 5023ca18471337d8977604002db3d6acb385b2e2
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 5023ca18471337d8977604002db3d6acb385b2e2 by Jerry Yin on 23/07/2026 at 15:09..
[AMDGPU] Consult AA for non-atomic clobbers in isReallyAClobber

isReallyAClobber (used by AMDGPUAnnotateUniformValues to decide whether a uniform
load may be marked !amdgpu.noclobber) only queried alias analysis for atomics;
every other memory-writing MemoryDef (plain stores, memory intrinsics, calls)
fell through to an unconditional "return true", declaring it a clobber without
asking AA.

As a result a uniform, read-only load is denied !amdgpu.noclobber whenever
MemorySSA's clobber walk surfaces such a def through a loop MemoryPhi, even when
AA can trivially prove NoAlias (e.g. an LDS/addrspace(3) write vs a
global/addrspace(1) load). Without noclobber the load is selected as a vector
GLOBAL_LOAD instead of a scalar s_load, adding a v_readfirstlane round-trip when
the value feeds a scalar operand.

Query AA generally via getModRefInfo for the fall-through case, while keeping the
fence/barrier whitelist and the pointer-level atomic special case (getModRefInfo
over-reports Mod for an atomic's ordering effects). The load's MemoryLocation is
threaded through so addressing/size precision applies.
https://invent.kde.org/qt/clang/llvm/-/commit/5023ca18471337d8977604002db3d6acb385b2e2