[all-commits] [llvm/llvm-project] 378629: [flang] Derive target-specific data layout from tr...

[anoopkg6 via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 378629b2200b092fa33e6171e7c749c95ff92e9c
      https://github.com/llvm/llvm-project/commit/378629b2200b092fa33e6171e7c749c95ff92e9c
  Author: anoopkg6 <anoop.kumar6 at ibm.com>
  Date:   2026-07-15 (Wed, 15 Jul 2026)

  Changed paths:
    M flang/lib/Optimizer/CodeGen/TargetRewrite.cpp

  Log Message:
  -----------
  [flang] Derive target-specific data layout from triple in TargetRewrite (#209649)

When target-rewrite runs without an explicit llvm.data_layout attribute,
it falls back to hardcoded generic default in MLIR (kDefaultDataLayout)
which specifies f128 ABI alignment as 16 bytes. This is incorrect for
targets where f128 ABI alignment differs from its size, such as SystemZ
which requires 8 bytes per the ELF ABI.

The target triple is available in the target-rewrite pass. Fix by
deriving the data layout from the target triple using
triple.computeDataLayout() before falling back to the generic default,
ensuring target-specific alignments are correctly reflected in
dlti.dl_spec.

@uweigand @dominik-steenken

---------

Co-authored-by: anoop.kumar6 at ibm.com <anoopk at b35lp63.lnxne.boe>



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