[llvm] [SPIRV] Implement handle_fromBinding intrinsic. (PR #111052)

[Nathan Gauër via llvm-commits]

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@@ -2558,6 +2580,37 @@ bool SPIRVInstructionSelector::selectIntrinsic(Register ResVReg,
   return true;
 }
 
+void SPIRVInstructionSelector::selectHandleFromBinding(Register &ResVReg,
+                                                       const SPIRVType *ResType,
+                                                       MachineInstr &I) const {
+
+  uint32_t Set =
+      getUnsignedConstantValueFromReg(I.getOperand(2).getReg(), *MRI);
+  uint32_t Binding =
+      getUnsignedConstantValueFromReg(I.getOperand(3).getReg(), *MRI);
+  uint32_t ArraySize =
+      getUnsignedConstantValueFromReg(I.getOperand(4).getReg(), *MRI);
+
+  MachineIRBuilder MIRBuilder(I);
+  Register VarReg =
+      buildPointerToResource(ResType, Set, Binding, ArraySize, MIRBuilder);
+
+  // TODO: For now we assume the resource is an image, which needs to be
+  // loaded to get the handle. That will not be true for storage buffers.
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Keenuts wrote:

How will those be differentiated? Would that be from the name, or the type? Or another annotation?

https://github.com/llvm/llvm-project/pull/111052