[all-commits] [llvm/llvm-project] b7286d: Reland "[LoopVectorize] Add support for reverse lo...

[David Sherwood via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b7286dbef9dc1986860d29e390b092599e1d7db5
      https://github.com/llvm/llvm-project/commit/b7286dbef9dc1986860d29e390b092599e1d7db5
  Author: David Sherwood <david.sherwood at arm.com>
  Date:   2025-01-27 (Mon, 27 Jan 2025)

  Changed paths:
    M llvm/include/llvm/Analysis/LoopAccessAnalysis.h
    M llvm/lib/Analysis/Loads.cpp
    M llvm/lib/Analysis/LoopAccessAnalysis.cpp
    M llvm/test/Transforms/LoopVectorize/X86/load-deref-pred.ll
    M llvm/test/Transforms/LoopVectorize/load-deref-pred-align.ll

  Log Message:
  -----------
  Reland "[LoopVectorize] Add support for reverse loops in isDereferenceableAndAlignedInLoop #96752" (#123616)

The last attempt failed a sanitiser build because we were
creating a reference to a null Predicates pointer in
isDereferenceableAndAlignedInLoop. This was exposed by
the unit test IsDerefReadOnlyLoop in
unittests/Analysis/LoadsTest.cpp. I fixed this by falling
back on getConstantMaxBackedgeTakenCount if Predicates is
null - see line 316 in llvm/lib/Analysis/Loads.cpp. There
are no other changes.



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