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
@@ -19,6 +19,7 @@
 void populateExpandFmaFPattern(RewritePatternSet &patterns);
 void populateExpandFloorFPattern(RewritePatternSet &patterns);
 void populateExpandCeilFPattern(RewritePatternSet &patterns);
+void populateExpandExp2FPattern(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
@@ -158,6 +158,22 @@
   return success();
 }
 
+// exp2f(float x) -> exp(x * ln(2))
+//   Proof: Let's say 2^x = y
+//   ln(2^x) = ln(y)
+//   x * ln(2) = ln(y) => e ^(x*ln(2)) = y
+static LogicalResult convertExp2fOp(math::Exp2Op op,
+                                    PatternRewriter &rewriter) {
+  ImplicitLocOpBuilder b(op->getLoc(), rewriter);
+  Value operand = op.getOperand();
+  Type opType = operand.getType();
+  Value ln2 = createFloatConst(op->getLoc(), opType, llvm::numbers::ln2, b);
+  Value mult = b.create<arith::MulFOp>(opType, operand, ln2);
+  Value exp = b.create<math::ExpOp>(op->getLoc(), mult);
+  rewriter.replaceOp(op, exp);
+  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,
@@ -222,6 +238,10 @@
   patterns.add(convertCeilOp);
 }
 
+void mlir::populateExpandExp2FPattern(RewritePatternSet &patterns) {
+  patterns.add(convertExp2fOp);
+}
+
 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
@@ -165,3 +165,27 @@
   %ret = math.ceil %a : f64
   return %ret : f64
 }
+
+// -----
+
+// CHECK-LABEL:     func @exp2f_func
+// CHECK-SAME:      ([[ARG0:%.+]]: f64) -> f64
+func.func @exp2f_func(%a: f64) -> f64 {
+  // CHECK-DAG:     [[CST:%.+]]  = arith.constant 0.69314718055994529
+  // CHECK:         [[MULF:%.+]] = arith.mulf [[ARG0]], [[CST]]
+  // CHECK:         [[EXP:%.+]]  = math.exp [[MULF]]
+  // CHECK:         return [[EXP]]
+  %ret = math.exp2 %a : f64
+  return %ret : f64
+}
+
+// CHECK-LABEL:     func @exp2f_func_tensor
+// CHECK-SAME:      ([[ARG0:%.+]]: tensor<1xf32>) -> tensor<1xf32>
+func.func @exp2f_func_tensor(%a: tensor<1xf32>) -> tensor<1xf32> {
+  // CHECK-DAG:     [[CST:%.+]]  = arith.constant dense<0.693147182>
+  // CHECK:         [[MULF:%.+]] = arith.mulf [[ARG0]], [[CST]]
+  // CHECK:         [[EXP:%.+]]  = math.exp [[MULF]]
+  // CHECK:         return [[EXP]]
+  %ret = math.exp2 %a : tensor<1xf32>
+  return %ret : tensor<1xf32>
+}
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
@@ -37,6 +37,7 @@
 void TestExpandMathPass::runOnOperation() {
   RewritePatternSet patterns(&getContext());
   populateExpandCtlzPattern(patterns);
+  populateExpandExp2FPattern(patterns);
   populateExpandTanPattern(patterns);
   populateExpandTanhPattern(patterns);
   populateExpandFmaFPattern(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
new file mode 100644
--- /dev/null
+++ b/mlir/test/mlir-cpu-runner/test-expand-math-approx.mlir
@@ -0,0 +1,61 @@
+// RUN:   mlir-opt %s -pass-pipeline="builtin.module(func.func(test-expand-math,convert-arith-to-llvm),convert-vector-to-llvm,func.func(convert-math-to-llvm),convert-func-to-llvm,reconcile-unrealized-casts)" \
+// RUN: | mlir-cpu-runner                                                      \
+// RUN:     -e main -entry-point-result=void -O0                               \
+// RUN:     -shared-libs=%mlir_c_runner_utils  \
+// RUN:     -shared-libs=%mlir_runner_utils    \
+// RUN: | FileCheck %s
+
+// -------------------------------------------------------------------------- //
+// exp2f.
+// -------------------------------------------------------------------------- //
+func.func @func_exp2f(%a : f64) {
+  %r = math.exp2 %a : f64
+  vector.print %r : f64
+  return
+}
+
+func.func @exp2f() {
+  // CHECK: 2
+  %a = arith.constant 1.0 : f64
+  call @func_exp2f(%a) : (f64) -> ()  
+
+  // CHECK: 4
+  %b = arith.constant 2.0 : f64
+  call @func_exp2f(%b) : (f64) -> ()
+
+  // CHECK: 5.65685
+  %c = arith.constant 2.5 : f64
+  call @func_exp2f(%c) : (f64) -> ()
+
+  // CHECK: 0.29730
+  %d = arith.constant -1.75 : f64
+  call @func_exp2f(%d) : (f64) -> ()
+
+  // CHECK: 1.09581
+  %e = arith.constant 0.132 : f64
+  call @func_exp2f(%e) : (f64) -> ()
+
+  // CHECK: inf
+  %f1 = arith.constant 0.00 : f64
+  %f2 = arith.constant 1.00 : f64
+  %f = arith.divf %f2, %f1 : f64
+  call @func_exp2f(%f) : (f64) -> ()
+
+  // CHECK: inf
+  %g = arith.constant 5038939.0 : f64
+  call @func_exp2f(%g) : (f64) -> ()
+
+  // CHECK: 0
+  %neg_inf = arith.constant 0xff80000000000000 : f64
+  call @func_exp2f(%neg_inf) : (f64) -> ()
+
+  // CHECK: inf
+  %i = arith.constant 0x7fc0000000000000 : f64
+  call @func_exp2f(%i) : (f64) -> ()
+  return
+}
+
+func.func @main() {
+  call @exp2f() : () -> ()
+  return
+}