[mlir][gpu] Fix build failure / silence windows build warnings

Fixes Windows build failure (C4715) caused by
6ca1a09f03e8e940f306bea73efa935e4ee38173.

diff --git a/mlir/lib/Conversion/GPUToNVVM/LowerGpuOpsToNVVMOps.cpp b/mlir/lib/Conversion/GPUToNVVM/LowerGpuOpsToNVVMOps.cpp
index f3cf780..40fd952 100644 (file)
--- a/mlir/lib/Conversion/GPUToNVVM/LowerGpuOpsToNVVMOps.cpp
+++ b/mlir/lib/Conversion/GPUToNVVM/LowerGpuOpsToNVVMOps.cpp
@@ -206,6 +206,8 @@ struct LowerGpuOpsToNVVMOpsPass
             case gpu::AddressSpace::Private:
               return 0;
             }
+            llvm_unreachable("unknown address space enum value");
+            return 0;
           });
       gpu::populateMemorySpaceLoweringPatterns(typeConverter, patterns);
       ConversionTarget target(getContext());

diff --git a/mlir/lib/Conversion/GPUToROCDL/LowerGpuOpsToROCDLOps.cpp b/mlir/lib/Conversion/GPUToROCDL/LowerGpuOpsToROCDLOps.cpp
index 25571bd..034188f 100644 (file)
--- a/mlir/lib/Conversion/GPUToROCDL/LowerGpuOpsToROCDLOps.cpp
+++ b/mlir/lib/Conversion/GPUToROCDL/LowerGpuOpsToROCDLOps.cpp
@@ -146,6 +146,8 @@ struct LowerGpuOpsToROCDLOpsPass
             case gpu::AddressSpace::Private:
               return 5;
             }
+            llvm_unreachable("unknown address space enum value");
+            return 0;
           });
       ConversionTarget target(getContext());
       gpu::populateLowerMemorySpaceOpLegality(target);