diff --git a/mlir/include/mlir/Dialect/Arithmetic/IR/ArithmeticOps.td b/mlir/include/mlir/Dialect/Arithmetic/IR/ArithmeticOps.td
--- a/mlir/include/mlir/Dialect/Arithmetic/IR/ArithmeticOps.td
+++ b/mlir/include/mlir/Dialect/Arithmetic/IR/ArithmeticOps.td
@@ -892,6 +892,7 @@
     rounded using the default rounding mode. When operating on vectors, casts
     elementwise.
   }];
+  let hasFolder = 1;
 }
 
 //===----------------------------------------------------------------------===//
@@ -906,6 +907,7 @@
     rounded using the default rounding mode. When operating on vectors, casts
     elementwise.
   }];
+  let hasFolder = 1;
 }
 
 //===----------------------------------------------------------------------===//
@@ -919,6 +921,7 @@
     towards zero) unsigned integer value. When operating on vectors, casts
     elementwise.
   }];
+  let hasFolder = 1;
 }
 
 //===----------------------------------------------------------------------===//
@@ -932,6 +935,7 @@
     towards zero) signed integer value. When operating on vectors, casts
     elementwise.
   }];
+  let hasFolder = 1;
 }
 
 //===----------------------------------------------------------------------===//
diff --git a/mlir/lib/Dialect/Arithmetic/IR/ArithmeticOps.cpp b/mlir/lib/Dialect/Arithmetic/IR/ArithmeticOps.cpp
--- a/mlir/lib/Dialect/Arithmetic/IR/ArithmeticOps.cpp
+++ b/mlir/lib/Dialect/Arithmetic/IR/ArithmeticOps.cpp
@@ -14,6 +14,8 @@
 #include "mlir/IR/PatternMatch.h"
 #include "mlir/IR/TypeUtilities.h"
 
+#include "llvm/ADT/APSInt.h"
+
 using namespace mlir;
 using namespace mlir::arith;
 
@@ -881,6 +883,17 @@
   return checkIntFloatCast<IntegerType, FloatType>(inputs, outputs);
 }
 
+OpFoldResult arith::UIToFPOp::fold(ArrayRef<Attribute> operands) {
+  if (auto lhs = operands[0].dyn_cast_or_null<IntegerAttr>()) {
+    const APInt &api = lhs.getValue();
+    FloatType FT = getType().cast<FloatType>();
+    APFloat apf(FT.getFloatSemantics(), APInt::getZero(FT.getWidth()));
+    apf.convertFromAPInt(api, /*signed*/ false, APFloat::rmNearestTiesToEven);
+    return FloatAttr::get(FT, apf);
+  }
+  return {};
+}
+
 //===----------------------------------------------------------------------===//
 // SIToFPOp
 //===----------------------------------------------------------------------===//
@@ -889,6 +902,16 @@
   return checkIntFloatCast<IntegerType, FloatType>(inputs, outputs);
 }
 
+OpFoldResult arith::SIToFPOp::fold(ArrayRef<Attribute> operands) {
+  if (auto lhs = operands[0].dyn_cast_or_null<IntegerAttr>()) {
+    const APInt &api = lhs.getValue();
+    FloatType FT = getType().cast<FloatType>();
+    APFloat apf(FT.getFloatSemantics(), APInt::getZero(FT.getWidth()));
+    apf.convertFromAPInt(api, /*signed*/ true, APFloat::rmNearestTiesToEven);
+    return FloatAttr::get(FT, apf);
+  }
+  return {};
+}
 //===----------------------------------------------------------------------===//
 // FPToUIOp
 //===----------------------------------------------------------------------===//
@@ -897,6 +920,25 @@
   return checkIntFloatCast<FloatType, IntegerType>(inputs, outputs);
 }
 
+OpFoldResult arith::FPToUIOp::fold(ArrayRef<Attribute> operands) {
+  if (auto lhs = operands[0].dyn_cast_or_null<FloatAttr>()) {
+    const APFloat &V = lhs.getValue();
+    IntegerType IT = getType().cast<IntegerType>();
+    bool ignored;
+    uint32_t DestBitWidth = IT.getWidth();
+    APSInt IntVal(DestBitWidth, /*unsigned*/ true);
+    if (APFloat::opInvalidOp ==
+        V.convertToInteger(IntVal, APFloat::rmTowardZero, &ignored)) {
+      // Undefined behavior invoked - the destination type can't represent
+      // the input constant.
+      return {};
+    }
+    return IntegerAttr::get(getType(), IntVal);
+  }
+
+  return {};
+}
+
 //===----------------------------------------------------------------------===//
 // FPToSIOp
 //===----------------------------------------------------------------------===//
@@ -905,6 +947,25 @@
   return checkIntFloatCast<FloatType, IntegerType>(inputs, outputs);
 }
 
+OpFoldResult arith::FPToSIOp::fold(ArrayRef<Attribute> operands) {
+  if (auto lhs = operands[0].dyn_cast_or_null<FloatAttr>()) {
+    const APFloat &V = lhs.getValue();
+    IntegerType IT = getType().cast<IntegerType>();
+    bool ignored;
+    uint32_t DestBitWidth = IT.getWidth();
+    APSInt IntVal(DestBitWidth, /*unsigned*/ false);
+    if (APFloat::opInvalidOp ==
+        V.convertToInteger(IntVal, APFloat::rmTowardZero, &ignored)) {
+      // Undefined behavior invoked - the destination type can't represent
+      // the input constant.
+      return {};
+    }
+    return IntegerAttr::get(getType(), IntVal);
+  }
+
+  return {};
+}
+
 //===----------------------------------------------------------------------===//
 // IndexCastOp
 //===----------------------------------------------------------------------===//
diff --git a/mlir/test/Dialect/Arithmetic/canonicalize.mlir b/mlir/test/Dialect/Arithmetic/canonicalize.mlir
--- a/mlir/test/Dialect/Arithmetic/canonicalize.mlir
+++ b/mlir/test/Dialect/Arithmetic/canonicalize.mlir
@@ -484,3 +484,41 @@
   %3 = arith.minui %arg0, %c0 : i8
   return %0, %1, %2, %3: i8, i8, i8, i8
 }
+
+// -----
+
+// CHECK-LABEL: @constantFPtoUI(
+func @constantFPtoUI() -> i32 {
+  // CHECK: %[[C0:.+]] = arith.constant 2 : i32
+  // CHECK: return %[[C0]]
+  %c0 = arith.constant 2.0 : f32
+  %res = arith.fptoui %c0 : f32 to i32
+  return %res : i32
+}
+
+// CHECK-LABEL: @constantFPtoSI(
+func @constantFPtoSI() -> i32 {
+  // CHECK: %[[C0:.+]] = arith.constant -2 : i32
+  // CHECK: return %[[C0]]
+  %c0 = arith.constant -2.0 : f32
+  %res = arith.fptosi %c0 : f32 to i32
+  return %res : i32
+}
+
+// CHECK-LABEL: @constantSItoFP(
+func @constantSItoFP() -> f32 {
+  // CHECK: %[[C0:.+]] = arith.constant -2.000000e+00 : f32
+  // CHECK: return %[[C0]]
+  %c0 = arith.constant -2 : i32
+  %res = arith.sitofp %c0 : i32 to f32
+  return %res : f32
+}
+
+// CHECK-LABEL: @constantUItoFP(
+func @constantUItoFP() -> f32 {
+  // CHECK: %[[C0:.+]] = arith.constant 2.000000e+00 : f32
+  // CHECK: return %[[C0]]
+  %c0 = arith.constant 2 : i32
+  %res = arith.sitofp %c0 : i32 to f32
+  return %res : f32
+}