Recompose multiple ops into a single ONNXGelu (#2965)

Recompose multiple ops into a single ONNXGelu (#2965)

Signed-off-by: Tung D. Le <[email protected]>

---------

Signed-off-by: Tung D. Le <[email protected]>

Author: tungld

src/Dialect/ONNX/DialectBuilder.cpp

@@ -150,6 +150,11 @@ Value OnnxBuilder::expand(Type outputType, Value input, Value shape) const {
       outputType, toTensor(input), toTensor(shape));
 }
 
+Value OnnxBuilder::gelu(Value input, StringAttr approximateAttr) const {
+  return createOpAndInferShapes<ONNXGeluOp>(
+      toTensor(input.getType()), input, approximateAttr);
+}
+
 // ONNXLayerNormalizationOp, version with one output only (Y).
 Value OnnxBuilder::layerNorm(Type outputType, Value input, Value scale,
     Value bias, int64_t axis, FloatAttr epsilon) const {

src/Dialect/ONNX/DialectBuilder.hpp

@@ -87,6 +87,9 @@ struct OnnxBuilder : DialectBuilder {
   mlir::Value expand(
       mlir::Type outputType, mlir::Value input, mlir::Value shape) const;
 
+  // ONNXGeluOp
+  mlir::Value gelu(mlir::Value input, mlir::StringAttr approximateAttr) const;
+
   // ONNXLayerNormalizationOp, version with one output only (Y).
   mlir::Value layerNorm(mlir::Type outputType, mlir::Value input,
       mlir::Value scale, mlir::Value bias, int64_t axis,

src/Dialect/ONNX/ONNXOps/OpHelper.cpp

@@ -579,6 +579,24 @@ RESULT_TYPE getScalarValue(ONNXConstantOp constantOp) {
 template double getScalarValue<double>(ONNXConstantOp constantOp);
 template int64_t getScalarValue<int64_t>(ONNXConstantOp constantOp);
 
+/// Return the wide type of a value.
+WideNum asWideNum(double n, Type elemType) {
+  return wideZeroDispatch(elemType, [n](auto wideZero) {
+    using cpptype = decltype(wideZero);
+    constexpr BType TAG = toBType<cpptype>;
+    return WideNum::widen<TAG>(static_cast<cpptype>(n));
+  });
+}
+
+/// Checks whether a constant tensor's elements are all equal to a given scalar.
+bool isConstOf(Value constValue, double n) {
+  ElementsAttr constElements = getElementAttributeFromONNXValue(constValue);
+  Type elemType = constElements.getElementType();
+  assert(!elemType.isInteger(1) && "booleans are not supported");
+  WideNum w = asWideNum(n, elemType);
+  return ElementsAttrBuilder::allEqual(constElements, w);
+}
+
 // Convert type to MLIR type.
 // A complete list of types can be found in:
 // <onnx-mlir-build-folder>/third_party/onnx/onnx/onnx.pb.h

src/Dialect/ONNX/ONNXOps/OpHelper.hpp

@@ -244,6 +244,12 @@ RESULT_TYPE getScalarValue(mlir::ElementsAttr denseAttr, mlir::Type type);
 template <typename RESULT_TYPE>
 RESULT_TYPE getScalarValue(mlir::ONNXConstantOp constantOp);
 
+/// Return the wide type of a value.
+WideNum asWideNum(double n, mlir::Type elemType);
+
+/// Checks whether a constant tensor's elements are all equal to a given scalar.
+bool isConstOf(mlir::Value constValue, double n);
+
 mlir::Type convertONNXTypeToMLIRType(
     mlir::Builder &builder, onnx::TensorProto_DataType onnxType);
 
@@ -277,6 +283,43 @@ bool operandOfOpDefinedBy(mlir::Operation *&matchOp, mlir::Operation *op,
     mlir::Value &matchOperand0, mlir::Value &matchOperand1,
     int64_t matchThisOperandIndex);
 
+// This is to recognize a binary op, e.g. A*B where one of A and B is a constant
+// and the other one is defined by OP.
+// Note: this function can handle the communitive property of the binary op.
+//
+// For example, to recognize this pattern:
+// %x = "onnx.Tanh"()
+// %y = 0.5 * %x    // or %x * 0.5
+//
+// we call
+// ```
+//   ONNXTanhOp tanhOp;
+//   bool found = matchConstAndOp<ONNXTanhOp>(A, B, 0.5, tanhOp);
+// ```
+// where `A` and `B` are operands of ONNXMul that produces %y.
+template <typename OP>
+bool matchConstAndOp(mlir::Value A, mlir::Value B, double cst, OP &op);
+
+// This is to recognize a binary op, e.g. A*B where one of A and B is the given
+// value and the other one is defined by OP.
+// Note: this function can handle the communitive property of the binary op.
+//
+// For example, to recognize this pattern where %z is one of the inputs of *,
+// and the other input of * is defined by onnx.Tanh:
+// %x = "onnx.Tanh"()
+// %y = %z * %x    // or %x * %z
+//
+// we call
+// ```
+//   Value z;
+//   ONNXTanhOp tanhOp;
+//   bool found = matchConstAndOp<ONNXTanhOp>(A, B, z, tanhOp);
+// ```
+// where `A` and `B` are operands of ONNXMul that produces %y.
+template <typename OP>
+bool matchValueAndOp(
+    mlir::Value A, mlir::Value B, mlir::Value matchValue, OP &matchOp);
+
 /// Check if a value is to store dimensions, meaning it is a tensor of one
 /// element or concatenation of one-element tensors.
 bool areDims(mlir::Value val);

src/Dialect/ONNX/ONNXOps/OpHelper.hpp.inc

@@ -83,3 +83,65 @@ bool operandOfOpDefinedBy(mlir::Operation *&matchOp, mlir::Operation *op,
   }
   return false;
 }
+
+// This is to recognize a binary op, e.g. A*B where one of A and B is a constant
+// and the other one is defined by OP.
+// Note: this function can handle the communitive property of the binary op.
+//
+// For example, to recognize this pattern:
+// %x = "onnx.Tanh"()
+// %y = 0.5 * %x    // or %x * 0.5
+//
+// we call
+// ```
+//   ONNXTanhOp tanhOp; 
+//   bool found = matchConstAndOp<ONNXTanhOp>(A, B, 0.5, tanhOp);
+// ```
+// where `A` and `B` are operands of ONNXMul that produces %y.
+template <typename OP>
+bool matchConstAndOp(mlir::Value A, mlir::Value B, double cst, OP &matchOp) {
+  auto opA = A.getDefiningOp<OP>();
+  auto opB = B.getDefiningOp<OP>();
+  if (onnx_mlir::isDenseONNXConstant(A) && onnx_mlir::isConstOf(A, cst) && opB)
+  {
+    matchOp = opB;
+    return true;
+  }
+  if (opA && onnx_mlir::isDenseONNXConstant(B) && onnx_mlir::isConstOf(B, cst))
+  {
+    matchOp = opA;
+    return true;
+  }
+  return false;
+}
+
+// This is to recognize a binary op, e.g. A*B where one of A and B is the given 
+// value and the other one is defined by OP.
+// Note: this function can handle the communitive property of the binary op.
+//
+// For example, to recognize this pattern where %z is one of the inputs of *,
+// and the other input of * is defined by onnx.Tanh:
+// %x = "onnx.Tanh"()
+// %y = %z * %x    // or %x * %z 
+//
+// we call
+// ```
+//   Value z;
+//   ONNXTanhOp tanhOp; 
+//   bool found = matchConstAndOp<ONNXTanhOp>(A, B, z, tanhOp);
+// ```
+// where `A` and `B` are operands of ONNXMul that produces %y.
+template <typename OP>
+bool matchValueAndOp(mlir::Value A, mlir::Value B, mlir::Value matchValue, OP &matchOp) {
+  auto opA = A.getDefiningOp<OP>();
+  auto opB = B.getDefiningOp<OP>();
+  if ((A == matchValue) && opB) {
+    matchOp = opB;
+    return true;
+  }
+  if (opA && (B == matchValue)) {
+    matchOp = opA;
+    return true;
+  }
+  return false;
+}

src/Dialect/ONNX/Transforms/ConstProp.cpp

@@ -186,23 +186,6 @@ Value createMinimumValueForClip(
       llvm::APFloat::getLargest, true, llvm::APInt::getMinValue);
 }
 
-WideNum asWideNum(double n, Type elemType) {
-  return wideZeroDispatch(elemType, [n](auto wideZero) {
-    using cpptype = decltype(wideZero);
-    constexpr BType TAG = toBType<cpptype>;
-    return WideNum::widen<TAG>(static_cast<cpptype>(n));
-  });
-}
-
-/// Checks whether a constant tensor's elements are all equal to a given scalar.
-bool isConstOf(Value constValue, double n) {
-  ElementsAttr constElements = getConstValueElements(constValue);
-  Type elemType = constElements.getElementType();
-  assert(!elemType.isInteger(1) && "booleans are not supported");
-  WideNum w = asWideNum(n, elemType);
-  return ElementsAttrBuilder::allEqual(constElements, w);
-}
-
 // Extracts number from a scalar constant value.
 WideNum getScalarNum(Value constValue) {
   ElementsAttr elements = getConstValueElements(constValue);