[all-commits] [llvm/llvm-project] a3efc5: [AIX][TLS] Produce a faster local-exec access sequ...

[Amy Kwan via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a3efc53f168b1451803a40075201c3490d6e3928
      https://github.com/llvm/llvm-project/commit/a3efc53f168b1451803a40075201c3490d6e3928
  Author: Amy Kwan <amy.kwan1 at ibm.com>
  Date:   2024-03-28 (Thu, 28 Mar 2024)

  Changed paths:
    M llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
    M llvm/lib/Target/PowerPC/PPCISelLowering.cpp
    A llvm/test/CodeGen/PowerPC/aix-small-tls-globalvarattr-funcattr.ll
    A llvm/test/CodeGen/PowerPC/aix-small-tls-globalvarattr-loadaddr.ll
    A llvm/test/CodeGen/PowerPC/aix-small-tls-globalvarattr-targetattr.ll

  Log Message:
  -----------
  [AIX][TLS] Produce a faster local-exec access sequence for the "aix-small-tls" global variable attribute (#83053)

Similar to 3f46e5453d9310b15d974e876f6132e3cf50c4b1, this patch allows
the backend to produce a faster access sequence for the local-exec TLS
model, where loading from the TOC can be avoided, for local-exec TLS
variables that are annotated with the "aix-small-tls" attribute.

The expectation is for local-exec TLS variables to be set with this
attribute through PGO. Furthermore, the optimized access sequence is
only generated for local-exec TLS variables annotated with
"aix-small-tls", only if they are less than ~32KB in size.



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