improve how lowering of formal arguments interprets a value of 'kernel_arg_type'

Author: VyacheslavLevytskyy

llvm/lib/Target/SPIRV/SPIRVCallLowering.cpp

@@ -157,22 +157,23 @@ static SPIRVType *getArgSPIRVType(const Function &F, unsigned ArgIdx,
       isSpecialOpaqueType(OriginalArgType))
     return GR->getOrCreateSPIRVType(OriginalArgType, MIRBuilder, ArgAccessQual);
 
-  MDString *MDKernelArgType = getOCLKernelArgType(F, ArgIdx);
-  if (!MDKernelArgType || (!MDKernelArgType->getString().ends_with("*") &&
-                           !MDKernelArgType->getString().ends_with("_t")))
-    return GR->getOrCreateSPIRVType(OriginalArgType, MIRBuilder, ArgAccessQual);
-
-  if (MDKernelArgType->getString().ends_with("*"))
-    return GR->getOrCreateSPIRVTypeByName(
-        MDKernelArgType->getString(), MIRBuilder,
-        addressSpaceToStorageClass(OriginalArgType->getPointerAddressSpace()));
-
-  if (MDKernelArgType->getString().ends_with("_t"))
-    return GR->getOrCreateSPIRVTypeByName(
-        "opencl." + MDKernelArgType->getString().str(), MIRBuilder,
-        SPIRV::StorageClass::Function, ArgAccessQual);
-
-  llvm_unreachable("Unable to recognize argument type name.");
+  SPIRVType *ResArgType = nullptr;
+  if (MDString *MDKernelArgType = getOCLKernelArgType(F, ArgIdx)) {
+    StringRef MDTypeStr = MDKernelArgType->getString();
+    if (MDTypeStr.ends_with("*")) {
+      ResArgType = GR->getOrCreateSPIRVTypeByName(
+          MDTypeStr, MIRBuilder,
+          addressSpaceToStorageClass(
+              OriginalArgType->getPointerAddressSpace()));
+    } else if (MDTypeStr.ends_with("_t")) {
+      ResArgType = GR->getOrCreateSPIRVTypeByName(
+          "opencl." + MDTypeStr.str(), MIRBuilder,
+          SPIRV::StorageClass::Function, ArgAccessQual);
+    }
+  }
+  return ResArgType ? ResArgType
+                    : GR->getOrCreateSPIRVType(OriginalArgType, MIRBuilder,
+                                               ArgAccessQual);
 }
 
 static bool isEntryPoint(const Function &F) {

llvm/lib/Target/SPIRV/SPIRVGlobalRegistry.cpp

@@ -443,8 +443,9 @@ Register SPIRVGlobalRegistry::buildConstantSampler(
   SPIRVType *SampTy;
   if (SpvType)
     SampTy = getOrCreateSPIRVType(getTypeForSPIRVType(SpvType), MIRBuilder);
-  else
-    SampTy = getOrCreateSPIRVTypeByName("opencl.sampler_t", MIRBuilder);
+  else if ((SampTy = getOrCreateSPIRVTypeByName("opencl.sampler_t",
+                                                MIRBuilder)) == nullptr)
+    report_fatal_error("Unable to recognize SPIRV type name: opencl.sampler_t");
 
   auto Sampler =
       ResReg.isValid()
@@ -941,6 +942,7 @@ SPIRVGlobalRegistry::checkSpecialInstr(const SPIRV::SpecialTypeDescriptor &TD,
   return nullptr;
 }
 
+// Returns nullptr if unable to recognize SPIRV type name
 // TODO: maybe use tablegen to implement this.
 SPIRVType *SPIRVGlobalRegistry::getOrCreateSPIRVTypeByName(
     StringRef TypeStr, MachineIRBuilder &MIRBuilder,
@@ -992,8 +994,10 @@ SPIRVType *SPIRVGlobalRegistry::getOrCreateSPIRVTypeByName(
   } else if (TypeStr.starts_with("double")) {
     Ty = Type::getDoubleTy(Ctx);
     TypeStr = TypeStr.substr(strlen("double"));
-  } else
-    llvm_unreachable("Unable to recognize SPIRV type name.");
+  } else {
+    // Unable to recognize SPIRV type name
+    return nullptr;
+  }
 
   auto SpirvTy = getOrCreateSPIRVType(Ty, MIRBuilder, AQ);
 

llvm/lib/Target/SPIRV/SPIRVGlobalRegistry.h

@@ -138,6 +138,7 @@ class SPIRVGlobalRegistry {
 
   // Either generate a new OpTypeXXX instruction or return an existing one
   // corresponding to the given string containing the name of the builtin type.
+  // Return nullptr if unable to recognize SPIRV type name from `TypeStr`.
   SPIRVType *getOrCreateSPIRVTypeByName(
       StringRef TypeStr, MachineIRBuilder &MIRBuilder,
       SPIRV::StorageClass::StorageClass SC = SPIRV::StorageClass::Function,