Index: mlir/lib/Conversion/MathToLibm/MathToLibm.cpp
===================================================================
--- mlir/lib/Conversion/MathToLibm/MathToLibm.cpp
+++ mlir/lib/Conversion/MathToLibm/MathToLibm.cpp
@@ -11,6 +11,7 @@
 #include "../PassDetail.h"
 #include "mlir/Dialect/Arithmetic/IR/Arithmetic.h"
 #include "mlir/Dialect/Func/IR/FuncOps.h"
+#include "mlir/Dialect/LLVMIR/LLVMDialect.h"
 #include "mlir/Dialect/Math/IR/Math.h"
 #include "mlir/Dialect/Utils/IndexingUtils.h"
 #include "mlir/Dialect/Vector/IR/VectorOps.h"
@@ -129,6 +130,14 @@
     opFunc = rewriter.create<func::FuncOp>(rewriter.getUnknownLoc(), name,
                                            opFunctionTy);
     opFunc.setPrivate();
+
+    // By definition Math dialect operations imply LLVM's "readnone"
+    // function attribute, so we can set it here to provide more
+    // optimization opportunities (e.g. LICM) for backends targeting LLVM IR.
+    // This will have to be changed, when strict FP behavior is supported
+    // by Math dialect.
+    opFunc->setAttr(LLVM::LLVMDialect::getReadnoneAttrName(),
+                    UnitAttr::get(rewriter.getContext()));
   }
   assert(isa<FunctionOpInterface>(SymbolTable::lookupSymbolIn(module, name)));
 
Index: mlir/test/Conversion/MathToLibm/convert-to-libm.mlir
===================================================================
--- mlir/test/Conversion/MathToLibm/convert-to-libm.mlir
+++ mlir/test/Conversion/MathToLibm/convert-to-libm.mlir
@@ -1,23 +1,23 @@
 // RUN: mlir-opt %s -convert-math-to-libm -canonicalize | FileCheck %s
 
-// CHECK-DAG: @atan(f64) -> f64
-// CHECK-DAG: @atanf(f32) -> f32
-// CHECK-DAG: @erf(f64) -> f64
-// CHECK-DAG: @erff(f32) -> f32
-// CHECK-DAG: @expm1(f64) -> f64
-// CHECK-DAG: @expm1f(f32) -> f32
-// CHECK-DAG: @atan2(f64, f64) -> f64
-// CHECK-DAG: @atan2f(f32, f32) -> f32
-// CHECK-DAG: @tan(f64) -> f64
-// CHECK-DAG: @tanf(f32) -> f32
-// CHECK-DAG: @tanh(f64) -> f64
-// CHECK-DAG: @tanhf(f32) -> f32
-// CHECK-DAG: @round(f64) -> f64
-// CHECK-DAG: @roundf(f32) -> f32
-// CHECK-DAG: @cos(f64) -> f64
-// CHECK-DAG: @cosf(f32) -> f32
-// CHECK-DAG: @sin(f64) -> f64
-// CHECK-DAG: @sinf(f32) -> f32
+// CHECK-DAG: @atan(f64) -> f64 attributes {llvm.readnone}
+// CHECK-DAG: @atanf(f32) -> f32 attributes {llvm.readnone}
+// CHECK-DAG: @erf(f64) -> f64 attributes {llvm.readnone}
+// CHECK-DAG: @erff(f32) -> f32 attributes {llvm.readnone}
+// CHECK-DAG: @expm1(f64) -> f64 attributes {llvm.readnone}
+// CHECK-DAG: @expm1f(f32) -> f32 attributes {llvm.readnone}
+// CHECK-DAG: @atan2(f64, f64) -> f64 attributes {llvm.readnone}
+// CHECK-DAG: @atan2f(f32, f32) -> f32 attributes {llvm.readnone}
+// CHECK-DAG: @tan(f64) -> f64 attributes {llvm.readnone}
+// CHECK-DAG: @tanf(f32) -> f32 attributes {llvm.readnone}
+// CHECK-DAG: @tanh(f64) -> f64 attributes {llvm.readnone}
+// CHECK-DAG: @tanhf(f32) -> f32 attributes {llvm.readnone}
+// CHECK-DAG: @round(f64) -> f64 attributes {llvm.readnone}
+// CHECK-DAG: @roundf(f32) -> f32 attributes {llvm.readnone}
+// CHECK-DAG: @cos(f64) -> f64 attributes {llvm.readnone}
+// CHECK-DAG: @cosf(f32) -> f32 attributes {llvm.readnone}
+// CHECK-DAG: @sin(f64) -> f64 attributes {llvm.readnone}
+// CHECK-DAG: @sinf(f32) -> f32 attributes {llvm.readnone}
 // CHECK-DAG: @floor(f64) -> f64
 // CHECK-DAG: @floorf(f32) -> f32
 // CHECK-DAG: @ceil(f64) -> f64