using predicate info to refactor

Author: jiahanxie353

include/circt/Dialect/Calyx/CalyxLoweringUtils.h

@@ -779,6 +779,26 @@ class BuildCallInstance : public calyx::FuncOpPartialLoweringPattern {
   ComponentOp getCallComponent(mlir::func::CallOp callOp) const;
 };
 
+/// Predicate information for the floating point comparisons
+struct PredicateInfo {
+  struct InputPorts {
+    // Relevant ports to extract from the `std_compareFN`. For example, we
+    // extract the `lt` and the `unordered` ports when the predicate is `oge`.
+    enum Port { EQ, GT, LT, UNORDERED } port;
+    // Whether we should invert the port before passing as inputs to the `op`
+    // field. For example, we should invert both the `lt` and the `unordered`
+    // port just extracted for predicate `oge`.
+    bool invert;
+  };
+
+  // The combinational logic to apply to the input ports. For example, we should
+  // apply `AND` logic to the two input ports for predicate `oge`.
+  enum CombLogic { AND, OR, SPECIAL } logic;
+  SmallVector<InputPorts> inputPorts;
+};
+
+PredicateInfo getPredicateInfo(mlir::arith::CmpFPredicate pred);
+
 } // namespace calyx
 } // namespace circt