[Mlir-commits] [mlir] [mlir][spirv] Add 8-bit float type emulation (PR #148811)

[Jakub Kuderski]

================
@@ -318,6 +328,44 @@ static Type convertSubByteIntegerType(const SPIRVConversionOptions &options,
                           type.getSignedness());
 }
 
+/// Converts 8-bit float types to integer types with the same bit width.
+/// Returns a nullptr for unsupported 8-bit float types.
+static Type convert8BitFloatType(const SPIRVConversionOptions &options,
+                                 FloatType type) {
+  if (!options.emulateUnsupportedFloatTypes)
+    return nullptr;
+  // F8 types are converted to integer types with the same bit width.
+  if (isa<Float8E5M2Type, Float8E4M3Type, Float8E4M3FNType, Float8E5M2FNUZType,
+          Float8E4M3FNUZType, Float8E4M3B11FNUZType, Float8E3M4Type,
+          Float8E8M0FNUType>(type))
+    return IntegerType::get(type.getContext(), type.getWidth());
+  LLVM_DEBUG(llvm::dbgs() << "unsupported 8-bit float type\n");
+  return nullptr;
+}
+
+/// Returns a type with the same shape but with any 8-bit float element type
+/// converted to the same bit width integer type. This is a noop when the
+/// element type is not the 8-bit float type or emulation flag is set to false.
+static ShapedType
+convertShaped8BitFloatType(ShapedType type,
+                           const SPIRVConversionOptions &options) {
+  if (!options.emulateUnsupportedFloatTypes)
+    return type;
+  auto srcElementType = type.getElementType();
----------------
kuhar wrote:

```suggestion
  Type srcElementType = type.getElementType();
```

https://github.com/llvm/llvm-project/pull/148811