[all-commits] [llvm/llvm-project] b20896: [DirectX] Don't use IRBuilder to create GEPs (#227...

[Nikita Popov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b20896c96deab703d7f0e99301b553a8ef4abad7
      https://github.com/llvm/llvm-project/commit/b20896c96deab703d7f0e99301b553a8ef4abad7
  Author: Nikita Popov <npopov at redhat.com>
  Date:   2026-09-29 (Tue, 29 Sep 2026)

  Changed paths:
    M llvm/lib/Target/DirectX/DXILDataScalarization.cpp
    M llvm/lib/Target/DirectX/DXILFlattenArrays.cpp
    M llvm/lib/Target/DirectX/DXILLegalizePass.cpp
    M llvm/lib/Target/DirectX/DXILMemIntrinsics.cpp
    M llvm/lib/Target/DirectX/DXILOpLowering.cpp
    M llvm/test/CodeGen/DirectX/bugfix_150050_data_scalarize_const_gep.ll
    M llvm/test/CodeGen/DirectX/flatten-array.ll
    M llvm/test/CodeGen/DirectX/flatten-bug-117273.ll
    M llvm/test/CodeGen/DirectX/legalize-i8.ll
    M llvm/test/CodeGen/DirectX/llc-vector-load-scalarize.ll
    M llvm/test/CodeGen/DirectX/scalar-store.ll
    M llvm/test/CodeGen/DirectX/scalarize-static-array-of-float-vectors.ll
    M llvm/test/tools/dxil-dis/constantexpr-gep.ll

  Log Message:
  -----------
  [DirectX] Don't use IRBuilder to create GEPs (#227000)

This switches the DirectX backend to directly call
`GetElementPtrInst::Create()` instead of creating GEPs via IRBuilder.
IRBuilder will soon start canonicalizing GEPs to ptradd representation
(with the first change being
https://github.com/llvm/llvm-project/pull/226425, affecting constant
expressions only), while DirectX needs GEPs to have specific form.

The change implemented here is a minimal one to unblock further work. In
the future, it will become impossible to construct such GEPs through any
API. The DirectX backend needs to switch to using an intrinsic to
represent any non-canonical GEPs it needs. This followup work is tracked
in https://github.com/llvm/llvm-project/issues/227005.



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