[all-commits] [llvm/llvm-project] 160665: [RFC][CodeGen] Add generic target feature checks f...

[Shilei Tian via All-commits]

  Branch: refs/heads/users/shiltian/rfc-intrinsic-predicate
  Home:   https://github.com/llvm/llvm-project
  Commit: 160665860acd7d7389946e19f774a119553682cf
      https://github.com/llvm/llvm-project/commit/160665860acd7d7389946e19f774a119553682cf
  Author: Shilei Tian <i at tianshilei.me>
  Date:   2026-06-03 (Wed, 03 Jun 2026)

  Changed paths:
    M llvm/docs/ReleaseNotes.md
    M llvm/include/llvm/CodeGen/TargetSubtargetInfo.h
    M llvm/include/llvm/IR/Intrinsics.h
    M llvm/include/llvm/IR/Intrinsics.td
    M llvm/include/llvm/IR/IntrinsicsAMDGPU.td
    M llvm/include/llvm/MC/MCSubtargetInfo.h
    M llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
    M llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
    M llvm/lib/CodeGen/TargetSubtargetInfo.cpp
    M llvm/lib/IR/Intrinsics.cpp
    M llvm/lib/MC/MCSubtargetInfo.cpp
    M llvm/test/CodeGen/AMDGPU/llvm.amdgcn.permlane16.swap.ll
    A llvm/test/TableGen/intrinsic-target-features.td
    M llvm/utils/TableGen/Basic/CodeGenIntrinsics.cpp
    M llvm/utils/TableGen/Basic/CodeGenIntrinsics.h
    M llvm/utils/TableGen/Basic/IntrinsicEmitter.cpp

  Log Message:
  -----------
  [RFC][CodeGen] Add generic target feature checks for intrinsics

This PR adds target-independent infrastructure for annotating LLVM intrinsics
with required subtarget feature expressions.

It introduces a TargetFeatures string field to intrinsic TableGen records.
TableGen emits an intrinsic-to-feature mapping table.

Both SelectionDAG and GlobalISel now perform this check before lowering target
intrinsics. This allows targets to opt in by annotating intrinsic definitions
directly, rather than adding custom checks during lowering, legalization, or
instruction selection.

This PR uses one AMDGPU intrinsic as an example.



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