diff --git a/query/include/Dialect/Sandbox/IR/SandboxBase.td b/query/include/Dialect/Sandbox/IR/SandboxBase.td
index cb64a2b8205..3cd79d266ef 100644
--- a/query/include/Dialect/Sandbox/IR/SandboxBase.td
+++ b/query/include/Dialect/Sandbox/IR/SandboxBase.td
@@ -49,6 +49,7 @@ def Sandbox_CmpPredicateAttr : I64EnumAttr<
       I64EnumAttrCase<"GT", 2, "gt">,
       I64EnumAttrCase<"GTEQ", 3, "gteq">,
       I64EnumAttrCase<"EQ", 4, "eq">,
+      I64EnumAttrCase<"NEQ", 5, "eq">,
     ]> {
 }
 
diff --git a/query/include/Dialect/Sandbox/IR/SandboxOps.td b/query/include/Dialect/Sandbox/IR/SandboxOps.td
index 8fe51ec723d..5fd43c9850e 100644
--- a/query/include/Dialect/Sandbox/IR/SandboxOps.td
+++ b/query/include/Dialect/Sandbox/IR/SandboxOps.td
@@ -3,19 +3,26 @@
 
 include "Dialect/Sandbox/IR/SandboxBase.td"
 include "mlir/Interfaces/SideEffectInterfaces.td"
-
+include "mlir/IR/OpBase.td"
 
 class Sandbox_Op<string mnemonic, list<Trait> traits = []> :
         Op<Sandbox_Dialect, mnemonic, traits>;
 
 def Sandbox_ConstantOp : Sandbox_Op<"constant", [ConstantLike, NoSideEffect]> {
-  let arguments = (ins SI32Attr:$value);
-  let results = (outs Sandbox_Int:$output);
-  let assemblyFormat = "$value attr-dict `:` type($output)";
+  let arguments = (ins AnyAttr:$value);
+  let results = (outs AnyType:$output);
+  let assemblyFormat = "`(`$value`)` attr-dict `:` type($output)";
+
+  let builders = [
+    OpBuilder<(ins "::mlir::Attribute":$value, "::mlir::Type":$type),
+    [{ build($_builder, $_state, type, value); }]>,
+  ];
 
   let hasFolder = true;
+  let hasVerifier = true;
 }
 
+
 def Sandbox_AddIOp : Sandbox_Op<"addi", [NoSideEffect, Commutative]> {
   let arguments = (ins Sandbox_Int:$lhs, Sandbox_Int:$rhs);
   let results = (outs Sandbox_Int:$result);
@@ -25,14 +32,7 @@ def Sandbox_AddIOp : Sandbox_Op<"addi", [NoSideEffect, Commutative]> {
   let hasCanonicalizer = true;
 }
 
-def BoolOp : Sandbox_Op<"bool", [ConstantLike, NoSideEffect]> {
-  let arguments = (ins BoolAttr:$value);
-  let results = (outs Sandbox_Bool:$output);
-  let assemblyFormat = "$value attr-dict `:` type($output)";
-}
-
-
-def ComparisonOp : Sandbox_Op<"compare", [NoSideEffect]> {
+def Sandbox_ComparisonOp : Sandbox_Op<"compare", [NoSideEffect]> {
   let arguments = (ins Sandbox_CmpPredicateAttr:$predicate, Sandbox_Int:$lhs, Sandbox_Int:$rhs);
   let results = (outs Sandbox_Bool:$output);
   let assemblyFormat = "$predicate `,` $lhs `,` $rhs attr-dict `:` type($output)";
@@ -41,13 +41,13 @@ def ComparisonOp : Sandbox_Op<"compare", [NoSideEffect]> {
     static CmpPredicate getPredicateByName(llvm::StringRef name);
   }];
 
-  let hasFolder = 0;
+  let hasFolder = 1;
   let hasCanonicalizer = 0;
 }
 
 def Sandbox_PrintOp : Sandbox_Op<"print"> {
-  let arguments = (ins Sandbox_Int:$value);
-  let assemblyFormat = "$value attr-dict";
+  let arguments = (ins AnyType:$value);
+  let assemblyFormat = "$value attr-dict `:` type($value)";
 }
 
 #endif // DIALECT_SANDBOX_SANDBOXOPS
diff --git a/query/lib/Conversion/LowerSandbox/LowerSandbox.cpp b/query/lib/Conversion/LowerSandbox/LowerSandbox.cpp
index 3f77e80dceb..85213bf4ae5 100644
--- a/query/lib/Conversion/LowerSandbox/LowerSandbox.cpp
+++ b/query/lib/Conversion/LowerSandbox/LowerSandbox.cpp
@@ -49,6 +49,58 @@ struct ConstantOpConversion : public mlir::OpConversionPattern<ir::ConstantOp> {
   }
 };
 
+struct ComparisonOpConversion : public mlir::OpConversionPattern<ir::ComparisonOp> {
+  ComparisonOpConversion(mlir::MLIRContext *context)
+      : OpConversionPattern<ir::ComparisonOp>(context, /*benefit=*/1) {}
+
+  mlir::LogicalResult
+  matchAndRewrite(ir::ComparisonOp op, OpAdaptor adaptor,
+                  mlir::ConversionPatternRewriter &rewriter) const override {
+    auto lhs = castToMLIR(rewriter, op->getLoc(), adaptor.lhs());
+    auto rhs = castToMLIR(rewriter, op->getLoc(), adaptor.rhs());
+
+    mlir::arith::CmpIPredicate pred;
+
+    switch(adaptor.predicate()) {
+      case CmpPredicate::LT:
+        pred = mlir::arith::CmpIPredicate::slt;
+        break;
+      case CmpPredicate::LTEQ:
+        pred = mlir::arith::CmpIPredicate::sle;
+        break;
+      case CmpPredicate::GT:
+        pred = mlir::arith::CmpIPredicate::sgt;
+        break;
+      case CmpPredicate::GTEQ:
+        pred = mlir::arith::CmpIPredicate::sge;
+        break;
+      case CmpPredicate::EQ:
+        pred = mlir::arith::CmpIPredicate::eq;
+        break;
+      case CmpPredicate::NEQ:
+        pred = mlir::arith::CmpIPredicate::ne;
+        break;
+    }
+
+    rewriter.replaceOpWithNewOp<mlir::arith::CmpIOp>(op,pred, lhs, rhs);
+    return mlir::success();
+  }
+};
+
+struct PrintOpConversion : public mlir::OpConversionPattern<ir::PrintOp> {
+  PrintOpConversion(mlir::MLIRContext *context)
+      : OpConversionPattern<ir::PrintOp>(context, /*benefit=*/1) {}
+
+  mlir::LogicalResult
+  matchAndRewrite(ir::PrintOp op, OpAdaptor adaptor,
+                  mlir::ConversionPatternRewriter &rewriter) const override {
+    auto value2 = castToMLIR(rewriter, op->getLoc(), adaptor.value());
+    rewriter.replaceOpWithNewOp<ir::PrintOp>(op, value2);
+    return mlir::success();
+  }
+};
+
+
 } // end namespace
 
 void LowerSandboxPass::runOnOperation() {
@@ -57,7 +109,7 @@ void LowerSandboxPass::runOnOperation() {
 
   // Configure conversion to lower out SCF operations.
   mlir::ConversionTarget target(getContext());
-  target.addIllegalOp<ir::ConstantOp, ir::AddIOp>();
+  target.addIllegalOp<ir::ConstantOp, ir::AddIOp, ir::ComparisonOp>();
   target.markUnknownOpDynamicallyLegal([](mlir::Operation *) { return true; });
   if (failed(
           applyPartialConversion(getOperation(), target, std::move(patterns))))
@@ -66,7 +118,10 @@ void LowerSandboxPass::runOnOperation() {
 
 void populateLowerSandboxConversionPatterns(
     mlir::RewritePatternSet &patterns) {
-  patterns.add<ConstantOpConversion, AddIOpConversion>(patterns.getContext());
+  patterns.add<
+    ConstantOpConversion,
+    AddIOpConversion,
+    ComparisonOpConversion>(patterns.getContext());
 }
 
 std::unique_ptr<mlir::Pass> createLowerSandboxPass() {
diff --git a/query/lib/Dialect/Sandbox/IR/SandboxOps.cpp b/query/lib/Dialect/Sandbox/IR/SandboxOps.cpp
index 7ff136c01ae..37666cb0cbc 100644
--- a/query/lib/Dialect/Sandbox/IR/SandboxOps.cpp
+++ b/query/lib/Dialect/Sandbox/IR/SandboxOps.cpp
@@ -5,6 +5,8 @@
 #include "mlir/IR/OpDefinition.h"
 #include "mlir/IR/PatternMatch.h"
 #include "mlir/IR/Location.h"
+#include "mlir/Support/LogicalResult.h"
+#include "llvm/ADT/APSInt.h"
 #include <cstddef>
 
 #include "Dialect/Sandbox/IR/SandboxOpsEnums.cpp.inc"
@@ -20,6 +22,23 @@ mlir::OpFoldResult ConstantOp::fold(llvm::ArrayRef<mlir::Attribute> operands) {
   return valueAttr();
 }
 
+mlir::LogicalResult ConstantOp::verify() {
+  auto type = getType();
+  // The value's type must match the return type.
+  auto valueType = value().getType();
+
+  if (valueType.isa<mlir::IntegerType>() && type.isa<IntType>()) {
+    return mlir::success();
+  }
+
+  if (valueType == mlir::IntegerType::get(getContext(), 1) && type.isa<BooleanType>()) {
+    return mlir::success();
+  }
+
+  return emitOpError() << "bad constant: type=" << type << ", valueType=" << valueType;
+}
+
+
 mlir::OpFoldResult AddIOp::fold(llvm::ArrayRef<mlir::Attribute> operands) {
   assert(operands.size() == 2 && "binary op takes two operands");
   if (!operands[0] || !operands[1])
@@ -37,6 +56,50 @@ mlir::OpFoldResult AddIOp::fold(llvm::ArrayRef<mlir::Attribute> operands) {
   return {};
 }
 
+
+mlir::OpFoldResult ComparisonOp::fold(llvm::ArrayRef<mlir::Attribute> operands) {
+  assert(operands.size() == 2 && "comparison op takes two operands");
+  if (!operands[0] || !operands[1])
+    return {};
+
+
+  if (operands[0].isa<mlir::IntegerAttr>() && operands[1].isa<mlir::IntegerAttr>()) {
+    auto pred = predicate();
+    auto lhs = operands[0].cast<mlir::IntegerAttr>();
+    auto rhs = operands[1].cast<mlir::IntegerAttr>();
+
+
+    bool x;
+    auto l = lhs.getValue();
+    auto r = rhs.getValue();
+    switch(pred) {
+      case CmpPredicate::LT:
+        x = l.slt(r);
+        break;
+      case CmpPredicate::LTEQ:
+        x = l.sle(r);
+        break;
+      case CmpPredicate::GT:
+        x = l.sgt(r);
+        break;
+      case CmpPredicate::GTEQ:
+        x = l.sge(r);
+        break;
+      case CmpPredicate::EQ:
+        x = l == r;
+        break;
+      case CmpPredicate::NEQ:
+        x = l != r;
+        break;
+    }
+
+    auto result = mlir::BoolAttr::get(getContext(), x);
+    return result;
+  }
+
+  return {};
+}
+
 struct SimplifyAddConstAddConst : public mlir::OpRewritePattern<AddIOp> {
   SimplifyAddConstAddConst(mlir::MLIRContext *context)
       : OpRewritePattern<AddIOp>(context, /*benefit=*/1) {}
@@ -51,7 +114,8 @@ struct SimplifyAddConstAddConst : public mlir::OpRewritePattern<AddIOp> {
 
     auto sumConst = rewriter.create<ConstantOp>(
       mlir::FusedLoc::get(op->getContext(), {lConst->getLoc(), rConst.getLoc()}, nullptr),
-      lConst.getType(), lConst.value() + rConst.value());
+      lConst.getType(), 
+      mlir::IntegerAttr::get(lConst.getType(), lConst.value().cast<mlir::IntegerAttr>().getValue() + rConst.value().cast<mlir::IntegerAttr>().getValue()));
     rewriter.replaceOpWithNewOp<AddIOp>(op, lhs.result().getType(), lhs.lhs(), sumConst);
     return mlir::success();
   }
diff --git a/query/test/current.mlir b/query/test/current.mlir
index 46bfe998494..0306ac97af2 100644
--- a/query/test/current.mlir
+++ b/query/test/current.mlir
@@ -1,9 +1,16 @@
-func.func @foo(%in: !sb.int) -> (!sb.bool) {
-    %i1 = sb.constant 5 : !sb.int
-    %i2 = sb.constant 7 : !sb.int
+func.func @foo(%in: !sb.int) -> () {
+    %i1 = sb.constant (5) : !sb.int
+    %i2 = sb.constant (7) : !sb.int
     %i3 = sb.addi %in %i1
     %i4 = sb.addi %i3 %i2
-    %i5 = sb.constant 6 : !sb.int
+    %i5 = sb.constant (6) : !sb.int
     %i6 = sb.compare eq, %i4, %i5 : !sb.bool
-    func.return %i6 : !sb.bool
+    sb.print %i6 : !sb.bool
+    func.return
+}
+
+func.func @bar() -> () {
+    %i1 = sb.constant (true) : !sb.bool
+    sb.print %i1 : !sb.bool
+    func.return
 }
\ No newline at end of file