[tosa_mlir_translator] Add FP16 support

serialize/deserialize FP16 tensors and constants

Signed-off-by: Tai Ly <tai.ly@arm.com>
Change-Id: Iab75aeda45983f328796f9463a57c69e86ab8f3e

1 files changed, 23 insertions, 2 deletions

diff --git a/src/TosaSerialize.cpp b/src/TosaSerialize.cpp
index 263f51c..2d038f0 100644
--- a/src/TosaSerialize.cpp
+++ b/src/TosaSerialize.cpp
@@ -75,9 +75,12 @@ static ResizeMode ResizeModeStr2Enum(const std::string &mode_str) {
 }
 
 static DType Type2DType(mlir::Type element_type) {
-  if (element_type.isF64() || element_type.isF32() || element_type.isF16() ||
-      element_type.isBF16()) {
+  if (element_type.isF64() || element_type.isF32()) {
     return DType_FP32;
+  } else if (element_type.isF16()) {
+    return DType_FP16;
+  } else if (element_type.isBF16()) {
+    return DType_BF16;
   } else if (element_type.isUnsignedInteger(8)) {
     return DType_UINT8;
   } else if (element_type.isInteger(4)) {
@@ -658,6 +661,24 @@ TosaSerializationOperatorBuilder::build<mlir::tosa::ConstOp>(
       return nullptr;
     }
     TosaSerializationHandler::ConvertF32toU8(data, u8_data);
+  } else if (type == DType_FP16) {
+    std::vector<float> data;
+    auto dense_attr = op.getAttr(llvm::StringRef("value"))
+                          .dyn_cast<mlir::DenseElementsAttr>();
+    auto val_attr =
+        op.getAttr(llvm::StringRef("value")).dyn_cast<mlir::FloatAttr>();
+
+    if (dense_attr) {
+      for (auto val : dense_attr.getValues<mlir::APFloat>()) {
+        data.push_back(val.convertToFloat());
+      }
+    } else if (val_attr) {
+      data.push_back((float)val_attr.getValueAsDouble());
+    } else {
+      op.emitOpError("Unknown const attribute");
+      return nullptr;
+    }
+    TosaSerializationHandler::ConvertF16toU8(data, u8_data);
   } else if (type == DType_INT8) {
     std::vector<int8_t> data;
     auto dense_attr = op.getAttr(llvm::StringRef("value"))