[PATCH] D152383: CodeGen: Expand memory intrinsics in PreISelIntrinsicLowering

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
arsenm added reviewers: bogner, AMDGPU, gchatelet, efriedma, aemerson, paquette, craig.topper, RKSimon, sfertile, ebrevnov.
Herald added subscribers: foad, kerbowa, pengfei, hiraditya, tpr, jvesely.
Herald added a project: All.
arsenm requested review of this revision.
Herald added a subscriber: wdng.
Herald added a project: LLVM.

Expand large or unknown size memory intrinsics into loops in the
default lowering pipeline if the target doesn't have the corresponding
libfunc. Previously AMDGPU had a custom pass which existed to call the
expansion utilities.

      

With a default no-libcall option, we can remove the libfunc checks in
LoopIdiomRecognize for these, which never made any sense. This also
provides a path to lifting the immarg restriction on
llvm.memcpy.inline.

There seems to be a bug where TLI reports functions as available if
you use -march and not -mtriple.


https://reviews.llvm.org/D152383

Files:
  llvm/docs/ReleaseNotes.rst
  llvm/include/llvm/Analysis/TargetTransformInfo.h
  llvm/include/llvm/Analysis/TargetTransformInfoImpl.h
  llvm/lib/Analysis/TargetTransformInfo.cpp
  llvm/lib/CodeGen/PreISelIntrinsicLowering.cpp
  llvm/lib/CodeGen/TargetPassConfig.cpp
  llvm/lib/Target/AMDGPU/AMDGPULowerIntrinsics.cpp
  llvm/lib/Target/AMDGPU/AMDGPUTargetTransformInfo.cpp
  llvm/lib/Target/AMDGPU/AMDGPUTargetTransformInfo.h
  llvm/lib/Target/ARM/ARMTargetTransformInfo.h
  llvm/lib/Target/X86/X86TargetTransformInfo.h
  llvm/test/CodeGen/AMDGPU/GlobalISel/llvm.memcpy.inline.ll
  llvm/test/CodeGen/AMDGPU/GlobalISel/llvm.memcpy.ll
  llvm/test/CodeGen/AMDGPU/GlobalISel/llvm.memmove.ll
  llvm/test/CodeGen/AMDGPU/GlobalISel/llvm.memset.ll
  llvm/test/CodeGen/AMDGPU/lower-mem-intrinsics-threshold.ll
  llvm/test/CodeGen/AMDGPU/lower-mem-intrinsics.ll

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