[all-commits] [llvm/llvm-project] ff9557: LAA cannot vectorize lib calls like modf/modff

[Paschalis Mpeis via All-commits]

  Branch: refs/heads/users/paschalis-mpeis/laa-vectorize-modf
  Home:   https://github.com/llvm/llvm-project
  Commit: ff9557fe913fd7901cd5a18757a2a41bffbe5c0e
      https://github.com/llvm/llvm-project/commit/ff9557fe913fd7901cd5a18757a2a41bffbe5c0e
  Author: Paschalis Mpeis <Paschalis.Mpeis at arm.com>
  Date:   2024-01-17 (Wed, 17 Jan 2024)

  Changed paths:
    A clang/test/CodeGen/aarch64-veclib-function-calls-linear-ptrs.c

  Log Message:
  -----------
  LAA cannot vectorize lib calls like modf/modff

Functions like modf/modff are math lib calls that set memory write-only
attribute. Given that a target has vectorized mappings, LAA should allow
vectorization.


  Commit: 2a3b1e60c3f68c2f823a42bcd6e67111a0b8a529
      https://github.com/llvm/llvm-project/commit/2a3b1e60c3f68c2f823a42bcd6e67111a0b8a529
  Author: Paschalis Mpeis <Paschalis.Mpeis at arm.com>
  Date:   2024-01-17 (Wed, 17 Jan 2024)

  Changed paths:
    M clang/test/CodeGen/aarch64-veclib-function-calls-linear-ptrs.c
    M llvm/lib/Analysis/LoopAccessAnalysis.cpp

  Log Message:
  -----------
  [LV][LAA] Vectorize math lib calls with mem write-only attribute

Teach LAA to consider safe specific math lib calls which are known to
have set the memory write-only attribute. Those attributes are set to
calls by inferNonMandatoryLibFuncAttrs, in BuildLibCalls.cpp, and the
current ones are modf/modff and frexp/frexpf.

This happens only when the calls are found through TLI to have
vectorized counterparts.


Compare: https://github.com/llvm/llvm-project/compare/ff9557fe913f%5E...2a3b1e60c3f6