[all-commits] [llvm/llvm-project] 3a4376: LAA: handle 0 return from getPtrStride correctly (...

[Ramkumar Ramachandra via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 3a4376b8f90686f754ee51b296a064ab03c12895
      https://github.com/llvm/llvm-project/commit/3a4376b8f90686f754ee51b296a064ab03c12895
  Author: Ramkumar Ramachandra <ramkumar.ramachandra at codasip.com>
  Date:   2025-01-27 (Mon, 27 Jan 2025)

  Changed paths:
    M llvm/lib/Analysis/LoopAccessAnalysis.cpp
    M llvm/test/Analysis/LoopAccessAnalysis/pointer-phis.ll
    M llvm/test/Transforms/LoopDistribute/pointer-phi-in-loop.ll
    M llvm/test/tools/UpdateTestChecks/update_analyze_test_checks/Inputs/loop-distribute.ll
    M llvm/test/tools/UpdateTestChecks/update_analyze_test_checks/Inputs/loop-distribute.ll.expected

  Log Message:
  -----------
  LAA: handle 0 return from getPtrStride correctly (#124539)

getPtrStride returns 0 when the PtrScev is loop-invariant, and this is
not an erroneous value: it returns std::nullopt to communicate that it
was not able to find a valid pointer stride. In analyzeLoop, we call
getPtrStride with a value_or(0) conflating the zero return value with
std::nullopt. Fix this, handling loop-invariant loads correctly.



To unsubscribe from these emails, change your notification settings at https://github.com/llvm/llvm-project/settings/notifications