[PATCH] D55914: [GlobalISel][InstructionSelect] Add support for selecting pointer types with TableGen

[Tom Stellard via Phabricator via llvm-commits]

tstellar created this revision.
tstellar added reviewers: dsanders, rtereshin.
Herald added subscribers: tpr, kristof.beyls, rovka.

There is no way to represent pointer types in TableGen, so have the instruction
selector convert pointer types to scalar types in GIM_SwitchType.

This will be tested by CodeGen/AMDGPU/GlobalIsel/smrd.ll once AMDGPU moves
load selection logic into TableGen.


Repository:
  rL LLVM

https://reviews.llvm.org/D55914

Files:
  include/llvm/CodeGen/GlobalISel/InstructionSelectorImpl.h


Index: include/llvm/CodeGen/GlobalISel/InstructionSelectorImpl.h
===================================================================
--- include/llvm/CodeGen/GlobalISel/InstructionSelectorImpl.h
+++ include/llvm/CodeGen/GlobalISel/InstructionSelectorImpl.h
@@ -205,7 +205,12 @@
         CurrentIdx = Default;
         break;
       }
-      const LLT Ty = MRI.getType(MO.getReg());
+
+      // TableGen is unable to match pointer types, so convert pointers
+      // to an integer type of the same size.
+      LLT Ty = MRI.getType(MO.getReg());
+      if (Ty.isPointer())
+        Ty = LLT::scalar(Ty.getSizeInBits());
       const auto TyI = ISelInfo.TypeIDMap.find(Ty);
       if (TyI == ISelInfo.TypeIDMap.end()) {
         CurrentIdx = Default;


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