[MLIR] Use enum class for broadcast hint. (#4238)

Co-authored-by: Scott Cyphers <diyessi@users.noreply.github.com>

src/contrib/mlir/backend/pass/affine_lowerer.cpp

@@ -1324,39 +1324,39 @@ namespace
         }
         attrs.gemmAttrs2d.ldc = attrs.gemmAttrs2d.n;
 
-        int broadcastHint = -2;
+        BroadcastType broadcastHint = BroadcastType::ERROR;
         if (vBias.rank() == 0)
         {
             // Scalar
-            broadcastHint = 2;
+            broadcastHint = BroadcastType::ROWCOLUMN;
         }
         else if (vBias.rank() == 2)
         {
             if (biasShape[0] == attrs.gemmAttrs2d.m && biasShape[1] == 1)
             {
-                broadcastHint = 1;
+                broadcastHint = BroadcastType::COLUMN;
             }
             else if (biasShape[0] == 1 && biasShape[1] == attrs.gemmAttrs2d.n)
             {
-                broadcastHint = 0;
+                broadcastHint = BroadcastType::ROW;
             }
-            else
+            else if (biasShape[0] == attrs.gemmAttrs2d.m && biasShape[1] == attrs.gemmAttrs2d.n)
             {
-                broadcastHint = -1;
+                broadcastHint = BroadcastType::NONE;
             }
         }
         else
         {
             if (biasShape[0] == attrs.gemmAttrs2d.m)
             {
-                broadcastHint = 1;
+                broadcastHint = BroadcastType::COLUMN;
             }
             else if (biasShape[0] == attrs.gemmAttrs2d.n)
             {
-                broadcastHint = 0;
+                broadcastHint = BroadcastType::ROW;
             }
         }
-        NGRAPH_CHECK(broadcastHint != -2, "Unhandled broadcast");
+        NGRAPH_CHECK(broadcastHint != BroadcastType::ERROR, "Unhandled broadcast");
         attrs.gemmAttrs2d.broadcastHint = broadcastHint;
 
         auto int64Ty = rewriter.getIntegerType(64);

src/contrib/mlir/runtime/cpu/callback_utils.hpp

@@ -84,6 +84,15 @@ namespace ngraph
                 SOFTMAX
             };
 
+            enum class BroadcastType
+            {
+                NONE,
+                ROW,
+                COLUMN,
+                ROWCOLUMN,
+                ERROR
+            };
+
             // These structs and union are used to pass attributes to callbacks.
             template <int N>
             struct poolAttrs
@@ -107,7 +116,7 @@ namespace ngraph
                 int64_t ldc;
                 float alpha;
                 float beta;
-                int64_t broadcastHint;
+                BroadcastType broadcastHint;
             };
 
             union opAttrs {

src/contrib/mlir/runtime/cpu/cpu_callbacks.cpp

@@ -636,7 +636,7 @@ static void __mlir_cblas_sgemm_with_bias(StaticMemRef* memRefmatA,
                        matOut,
                        std::max<size_t>(1, ldc));
 
-    if (broadcastHint == 0)
+    if (broadcastHint == BroadcastType::ROW)
     {
         std::vector<float> ones(m, 1.0f);
         cblas::cblas_sgemm(cblas::Layout::RowMajor,
@@ -654,7 +654,7 @@ static void __mlir_cblas_sgemm_with_bias(StaticMemRef* memRefmatA,
                            matOut,
                            std::max<size_t>(1, ldc));
     }
-    else if (broadcastHint == 1)
+    else if (broadcastHint == BroadcastType::COLUMN)
     {
         std::vector<float> ones(n, 1.0f);
         cblas::cblas_sgemm(cblas::Layout::RowMajor,
@@ -672,7 +672,7 @@ static void __mlir_cblas_sgemm_with_bias(StaticMemRef* memRefmatA,
                            matOut,
                            std::max<size_t>(1, ldc));
     }
-    else if (broadcastHint == 2)
+    else if (broadcastHint == BroadcastType::ROWCOLUMN)
     {
         std::vector<float> ones(m, 1.0f);
         std::vector<float> bias(n, *matC);
@@ -691,7 +691,7 @@ static void __mlir_cblas_sgemm_with_bias(StaticMemRef* memRefmatA,
                            matOut,
                            std::max<size_t>(1, ldc));
     }
-    else
+    else if (broadcastHint == BroadcastType::NONE)
     {
         std::vector<float> identity(n * n, 0.0f);
         for (auto i = 0; i < n * n; i += n + 1)
@@ -713,6 +713,10 @@ static void __mlir_cblas_sgemm_with_bias(StaticMemRef* memRefmatA,
                            matOut,
                            std::max<size_t>(1, ldc));
     }
+    else
+    {
+        NGRAPH_UNREACHABLE("Unsupported broadcast");
+    }
 }
 
 extern "C" void __mlir_callback_1_input(void* input, void* output, size_t index, OpType type)