diff --git a/mlir/include/mlir/Dialect/Math/Transforms/Passes.h b/mlir/include/mlir/Dialect/Math/Transforms/Passes.h
--- a/mlir/include/mlir/Dialect/Math/Transforms/Passes.h
+++ b/mlir/include/mlir/Dialect/Math/Transforms/Passes.h
@@ -20,6 +20,7 @@
 void populateExpandFloorFPattern(RewritePatternSet &patterns);
 void populateExpandCeilFPattern(RewritePatternSet &patterns);
 void populateExpandExp2FPattern(RewritePatternSet &patterns);
+void populateExpandRoundFPattern(RewritePatternSet &patterns);
 void populateMathAlgebraicSimplificationPatterns(RewritePatternSet &patterns);
 
 struct MathPolynomialApproximationOptions {
diff --git a/mlir/lib/Dialect/Math/Transforms/ExpandPatterns.cpp b/mlir/lib/Dialect/Math/Transforms/ExpandPatterns.cpp
--- a/mlir/lib/Dialect/Math/Transforms/ExpandPatterns.cpp
+++ b/mlir/lib/Dialect/Math/Transforms/ExpandPatterns.cpp
@@ -174,6 +174,28 @@
   return success();
 }
 
+static LogicalResult convertRoundOp(math::RoundOp op,
+                                    PatternRewriter &rewriter) {
+  ImplicitLocOpBuilder b(op->getLoc(), rewriter);
+  Value operand = op.getOperand();
+  Type opType = operand.getType();
+
+  // Creating constants for later use.
+  Value zero = createFloatConst(op->getLoc(), opType, 0.00, rewriter);
+  Value half = createFloatConst(op->getLoc(), opType, 0.5, rewriter);
+  Value negHalf = createFloatConst(op->getLoc(), opType, -0.5, rewriter);
+
+  Value posCheck =
+      b.create<arith::CmpFOp>(arith::CmpFPredicate::OGE, operand, zero);
+  Value incrValue =
+      b.create<arith::SelectOp>(op->getLoc(), posCheck, half, negHalf);
+  Value add = b.create<arith::AddFOp>(opType, operand, incrValue);
+
+  Value fpFixedConvert = createTruncatedFPValue(add, b);
+  rewriter.replaceOp(op, fpFixedConvert);
+  return success();
+}
+
 // Converts math.ctlz to scf and arith operations. This is done
 // by performing a binary search on the bits.
 static LogicalResult convertCtlzOp(math::CountLeadingZerosOp op,
@@ -242,6 +264,10 @@
   patterns.add(convertExp2fOp);
 }
 
+void mlir::populateExpandRoundFPattern(RewritePatternSet &patterns) {
+  patterns.add(convertRoundOp);
+}
+
 void mlir::populateExpandFloorFPattern(RewritePatternSet &patterns) {
   patterns.add(convertFloorOp);
 }
diff --git a/mlir/test/Dialect/Math/expand-math.mlir b/mlir/test/Dialect/Math/expand-math.mlir
--- a/mlir/test/Dialect/Math/expand-math.mlir
+++ b/mlir/test/Dialect/Math/expand-math.mlir
@@ -189,3 +189,21 @@
   %ret = math.exp2 %a : tensor<1xf32>
   return %ret : tensor<1xf32>
 }
+
+// -----
+
+// CHECK-LABEL:      func @roundf_func
+// CHECK-SAME:      ([[ARG0:%.+]]: f64) -> f64
+func.func @roundf_func(%a: f64) -> f64 {
+  // CHECK-DAG:   [[CST:%.+]] = arith.constant 0.000
+  // CHECK-DAG:   [[CST_0:%.+]] = arith.constant 5.000000e-01
+  // CHECK-DAG:   [[CST_1:%.+]] = arith.constant -5.000000e-01
+  // CHECK-DAG:  [[COMP:%.+]] = arith.cmpf oge, [[ARG0]], [[CST]]
+  // CHECK-DAG:  [[SEL:%.+]] = arith.select [[COMP]], [[CST_0]], [[CST_1]]
+  // CHECK-DAG:  [[ADDF:%.+]] = arith.addf [[ARG0]], [[SEL]]
+  // CHECK-DAG:   [[CVTI:%.+]] = arith.fptosi [[ADDF]]
+  // CHECK-DAG:   [[CVTF:%.+]] = arith.sitofp [[CVTI]]
+  // CHECK:   return [[CVTF]]
+  %ret = math.round %a : f64
+  return %ret : f64
+}
diff --git a/mlir/test/lib/Dialect/Math/TestExpandMath.cpp b/mlir/test/lib/Dialect/Math/TestExpandMath.cpp
--- a/mlir/test/lib/Dialect/Math/TestExpandMath.cpp
+++ b/mlir/test/lib/Dialect/Math/TestExpandMath.cpp
@@ -43,6 +43,7 @@
   populateExpandFmaFPattern(patterns);
   populateExpandFloorFPattern(patterns);
   populateExpandCeilFPattern(patterns);
+  populateExpandRoundFPattern(patterns);
   (void)applyPatternsAndFoldGreedily(getOperation(), std::move(patterns));
 }
 
diff --git a/mlir/test/mlir-cpu-runner/test-expand-math-approx.mlir b/mlir/test/mlir-cpu-runner/test-expand-math-approx.mlir
--- a/mlir/test/mlir-cpu-runner/test-expand-math-approx.mlir
+++ b/mlir/test/mlir-cpu-runner/test-expand-math-approx.mlir
@@ -55,7 +55,54 @@
   return
 }
 
+// -------------------------------------------------------------------------- //
+// round.
+// -------------------------------------------------------------------------- //
+func.func @func_roundf(%a : f32) {
+  %r = math.round %a : f32
+  vector.print %r : f32
+  return
+}
+
+func.func @roundf() {
+  // CHECK: 4
+  %a = arith.constant 3.8 : f32
+  call @func_roundf(%a) : (f32) -> ()
+
+  // CHECK: -4
+  %b = arith.constant -3.8 : f32
+  call @func_roundf(%b) : (f32) -> ()
+
+  // CHECK: 0
+  %c = arith.constant 0.0 : f32
+  call @func_roundf(%c) : (f32) -> ()
+
+  // CHECK: -4
+  %d = arith.constant -4.2 : f32
+  call @func_roundf(%d) : (f32) -> ()
+
+  // CHECK: -495
+  %e = arith.constant -495.0 : f32
+  call @func_roundf(%e) : (f32) -> ()
+
+  // CHECK: 495
+  %f = arith.constant 495.0 : f32
+  call @func_roundf(%f) : (f32) -> ()
+
+  // CHECK: 9
+  %g = arith.constant 8.5 : f32
+  call @func_roundf(%g) : (f32) -> ()
+
+  // CHECK: -9
+  %h = arith.constant -8.5 : f32
+  call @func_roundf(%h) : (f32) -> ()
+
+  return
+}
+
+
 func.func @main() {
   call @exp2f() : () -> ()
+  call @roundf() : () -> ()
   return
 }