diff --git a/mlir/include/mlir/Conversion/LLVMCommon/Pattern.h b/mlir/include/mlir/Conversion/LLVMCommon/Pattern.h
--- a/mlir/include/mlir/Conversion/LLVMCommon/Pattern.h
+++ b/mlir/include/mlir/Conversion/LLVMCommon/Pattern.h
@@ -22,8 +22,10 @@
 /// and given operands.
 LogicalResult oneToOneRewrite(Operation *op, StringRef targetOp,
                               ValueRange operands,
+                              ArrayRef<NamedAttribute> targetAttrs,
                               LLVMTypeConverter &typeConverter,
                               ConversionPatternRewriter &rewriter);
+
 } // namespace detail
 } // namespace LLVM
 
@@ -197,7 +199,7 @@
   matchAndRewrite(SourceOp op, typename SourceOp::Adaptor adaptor,
                   ConversionPatternRewriter &rewriter) const override {
     return LLVM::detail::oneToOneRewrite(op, TargetOp::getOperationName(),
-                                         adaptor.getOperands(),
+                                         adaptor.getOperands(), op->getAttrs(),
                                          *this->getTypeConverter(), rewriter);
   }
 };
diff --git a/mlir/include/mlir/Conversion/LLVMCommon/VectorPattern.h b/mlir/include/mlir/Conversion/LLVMCommon/VectorPattern.h
--- a/mlir/include/mlir/Conversion/LLVMCommon/VectorPattern.h
+++ b/mlir/include/mlir/Conversion/LLVMCommon/VectorPattern.h
@@ -56,14 +56,34 @@
 
 LogicalResult vectorOneToOneRewrite(Operation *op, StringRef targetOp,
                                     ValueRange operands,
+                                    ArrayRef<NamedAttribute> targetAttrs,
                                     LLVMTypeConverter &typeConverter,
                                     ConversionPatternRewriter &rewriter);
 } // namespace detail
 } // namespace LLVM
 
+// Default attribute conversion class, which passes all source attributes
+// through to the target op, unmodified.
+template <typename SourceOp, typename TargetOp>
+class AttrConvertPassThrough {
+public:
+  AttrConvertPassThrough(SourceOp srcOp) : srcAttrs(srcOp->getAttrs()) {}
+
+  ArrayRef<NamedAttribute> getAttrs() const { return srcAttrs; }
+
+private:
+  ArrayRef<NamedAttribute> srcAttrs;
+};
+
 /// Basic lowering implementation to rewrite Ops with just one result to the
 /// LLVM Dialect. This supports higher-dimensional vector types.
-template <typename SourceOp, typename TargetOp>
+/// The AttrConvert template template parameter should be a template class
+/// with SourceOp and TargetOp type parameters, a constructor that takes
+/// a SourceOp instance, and a getAttrs() method that returns
+/// ArrayRef<NamedAttribute>.
+template <typename SourceOp, typename TargetOp,
+          template <typename, typename> typename AttrConvert =
+              AttrConvertPassThrough>
 class VectorConvertToLLVMPattern : public ConvertOpToLLVMPattern<SourceOp> {
 public:
   using ConvertOpToLLVMPattern<SourceOp>::ConvertOpToLLVMPattern;
@@ -75,9 +95,12 @@
     static_assert(
         std::is_base_of<OpTrait::OneResult<SourceOp>, SourceOp>::value,
         "expected single result op");
+    // Determine attributes for the target op
+    AttrConvert<SourceOp, TargetOp> attrConvert(op);
+
     return LLVM::detail::vectorOneToOneRewrite(
         op, TargetOp::getOperationName(), adaptor.getOperands(),
-        *this->getTypeConverter(), rewriter);
+        attrConvert.getAttrs(), *this->getTypeConverter(), rewriter);
   }
 };
 } // namespace mlir
diff --git a/mlir/include/mlir/Dialect/Arith/IR/Arith.h b/mlir/include/mlir/Dialect/Arith/IR/Arith.h
--- a/mlir/include/mlir/Dialect/Arith/IR/Arith.h
+++ b/mlir/include/mlir/Dialect/Arith/IR/Arith.h
@@ -17,6 +17,7 @@
 #include "mlir/Interfaces/InferTypeOpInterface.h"
 #include "mlir/Interfaces/SideEffectInterfaces.h"
 #include "mlir/Interfaces/VectorInterfaces.h"
+#include "llvm/ADT/StringExtras.h"
 
 //===----------------------------------------------------------------------===//
 // ArithDialect
@@ -29,6 +30,13 @@
 //===----------------------------------------------------------------------===//
 
 #include "mlir/Dialect/Arith/IR/ArithOpsEnums.h.inc"
+#define GET_ATTRDEF_CLASSES
+#include "mlir/Dialect/Arith/IR/ArithOpsAttributes.h.inc"
+
+//===----------------------------------------------------------------------===//
+// Arith Interfaces
+//===----------------------------------------------------------------------===//
+#include "mlir/Dialect/Arith/IR/ArithOpsInterfaces.h.inc"
 
 //===----------------------------------------------------------------------===//
 // Arith Dialect Operations
diff --git a/mlir/include/mlir/Dialect/Arith/IR/ArithBase.td b/mlir/include/mlir/Dialect/Arith/IR/ArithBase.td
--- a/mlir/include/mlir/Dialect/Arith/IR/ArithBase.td
+++ b/mlir/include/mlir/Dialect/Arith/IR/ArithBase.td
@@ -23,6 +23,7 @@
   }];
 
   let hasConstantMaterializer = 1;
+  let useDefaultAttributePrinterParser = 1;
 }
 
 // The predicate indicates the type of the comparison to perform:
@@ -92,4 +93,32 @@
   let cppNamespace = "::mlir::arith";
 }
 
+def FASTMATH_NONE            : I32BitEnumAttrCaseNone<"none"      >;
+def FASTMATH_REASSOC         : I32BitEnumAttrCaseBit<"reassoc",  0>;
+def FASTMATH_NO_NANS         : I32BitEnumAttrCaseBit<"nnan",     1>;
+def FASTMATH_NO_INFS         : I32BitEnumAttrCaseBit<"ninf",     2>;
+def FASTMATH_NO_SIGNED_ZEROS : I32BitEnumAttrCaseBit<"nsz",      3>;
+def FASTMATH_ALLOW_RECIP     : I32BitEnumAttrCaseBit<"arcp",     4>;
+def FASTMATH_ALLOW_CONTRACT  : I32BitEnumAttrCaseBit<"contract", 5>;
+def FASTMATH_APPROX_FUNC     : I32BitEnumAttrCaseBit<"afn",      6>;
+def FASTMATH_FAST            : I32BitEnumAttrCaseGroup<
+    "fast",
+    [
+      FASTMATH_REASSOC,         FASTMATH_NO_NANS,     FASTMATH_NO_INFS,
+      FASTMATH_NO_SIGNED_ZEROS, FASTMATH_ALLOW_RECIP, FASTMATH_ALLOW_CONTRACT,
+      FASTMATH_APPROX_FUNC]>;
+
+def FastMathFlags : I32BitEnumAttr<
+    "FastMathFlags",
+    "Floating point fast math flags",
+    [
+      FASTMATH_NONE,           FASTMATH_REASSOC,         FASTMATH_NO_NANS,
+      FASTMATH_NO_INFS,        FASTMATH_NO_SIGNED_ZEROS, FASTMATH_ALLOW_RECIP,
+      FASTMATH_ALLOW_CONTRACT, FASTMATH_APPROX_FUNC,     FASTMATH_FAST]> {
+  let separator = ",";
+  let cppNamespace = "::mlir::arith";
+  let genSpecializedAttr = 0;
+  let printBitEnumPrimaryGroups = 1;
+}
+
 #endif // ARITH_BASE
diff --git a/mlir/include/mlir/Dialect/Arith/IR/ArithOps.td b/mlir/include/mlir/Dialect/Arith/IR/ArithOps.td
--- a/mlir/include/mlir/Dialect/Arith/IR/ArithOps.td
+++ b/mlir/include/mlir/Dialect/Arith/IR/ArithOps.td
@@ -10,6 +10,7 @@
 #define ARITH_OPS
 
 include "mlir/Dialect/Arith/IR/ArithBase.td"
+include "mlir/Dialect/Arith/IR/ArithOpsInterfaces.td"
 include "mlir/Interfaces/CastInterfaces.td"
 include "mlir/Interfaces/InferIntRangeInterface.td"
 include "mlir/Interfaces/InferTypeOpInterface.td"
@@ -17,6 +18,12 @@
 include "mlir/Interfaces/VectorInterfaces.td"
 include "mlir/IR/BuiltinAttributeInterfaces.td"
 include "mlir/IR/OpAsmInterface.td"
+include "mlir/IR/EnumAttr.td"
+
+def Arith_FastMathAttr :
+    EnumAttr<Arith_Dialect, FastMathFlags, "fastmath"> {
+  let assemblyFormat = "`<` $value `>`";
+}
 
 // Base class for Arith dialect ops. Ops in this dialect have no side
 // effects and can be applied element-wise to vectors and tensors.
@@ -58,15 +65,27 @@
 
 // Base class for floating point unary operations.
 class Arith_FloatUnaryOp<string mnemonic, list<Trait> traits = []> :
-    Arith_UnaryOp<mnemonic, traits>,
-    Arguments<(ins FloatLike:$operand)>,
-    Results<(outs FloatLike:$result)>;
+    Arith_UnaryOp<mnemonic,
+      !listconcat([DeclareOpInterfaceMethods<ArithFastMathInterface>],
+                  traits)>,
+    Arguments<(ins FloatLike:$operand,
+      DefaultValuedAttr<Arith_FastMathAttr, "FastMathFlags::none">:$fastmath)>,
+    Results<(outs FloatLike:$result)> {
+  let assemblyFormat = [{ $operand custom<ArithFastMathAttr>($fastmath)
+                          attr-dict `:` type($result) }];
+}
 
 // Base class for floating point binary operations.
 class Arith_FloatBinaryOp<string mnemonic, list<Trait> traits = []> :
-    Arith_BinaryOp<mnemonic, traits>,
-    Arguments<(ins FloatLike:$lhs, FloatLike:$rhs)>,
-    Results<(outs FloatLike:$result)>;
+    Arith_BinaryOp<mnemonic, 
+      !listconcat([DeclareOpInterfaceMethods<ArithFastMathInterface>],
+                  traits)>,
+    Arguments<(ins FloatLike:$lhs, FloatLike:$rhs,
+      DefaultValuedAttr<Arith_FastMathAttr, "FastMathFlags::none">:$fastmath)>,
+    Results<(outs FloatLike:$result)> {
+  let assemblyFormat = [{ $lhs `,` $rhs `` custom<ArithFastMathAttr>($fastmath)
+                          attr-dict `:` type($result) }];
+}
 
 // Base class for arithmetic cast operations. Requires a single operand and
 // result. If either is a shaped type, then the other must be of the same shape.
diff --git a/mlir/include/mlir/Dialect/Arith/IR/ArithOpsInterfaces.td b/mlir/include/mlir/Dialect/Arith/IR/ArithOpsInterfaces.td
new file mode 100644
--- /dev/null
+++ b/mlir/include/mlir/Dialect/Arith/IR/ArithOpsInterfaces.td
@@ -0,0 +1,52 @@
+//===-- ArithOpsInterfaces.td - arith op interfaces ---*- tablegen -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This is the Arith interfaces definition file.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef ARITH_OPS_INTERFACES
+#define ARITH_OPS_INTERFACES
+
+include "mlir/IR/OpBase.td"
+
+def ArithFastMathInterface : OpInterface<"ArithFastMathInterface"> {
+  let description = [{
+    Access to operation fastmath flags.
+  }];
+
+  let cppNamespace = "::mlir::arith";
+
+  let methods = [
+    InterfaceMethod<
+      /*desc=*/        "Returns a FastMathFlagsAttr attribute for the operation",
+      /*returnType=*/  "FastMathFlagsAttr",
+      /*methodName=*/  "getFastMathFlagsAttr",
+      /*args=*/        (ins),
+      /*methodBody=*/  [{}],
+      /*defaultImpl=*/ [{
+        ConcreteOp op = cast<ConcreteOp>(this->getOperation());
+        return op.getFastmathAttr();
+      }]
+      >,
+    StaticInterfaceMethod<
+      /*desc=*/        [{Returns the name of the FastMathFlagsAttr attribute
+                         for the operation}],
+      /*returnType=*/  "StringRef",
+      /*methodName=*/  "getFastMathAttrName",
+      /*args=*/        (ins),
+      /*methodBody=*/  [{}],
+      /*defaultImpl=*/ [{
+        return "fastmath";
+      }]
+      >
+
+  ];
+}
+
+#endif // ARITH_OPS_INTERFACES
diff --git a/mlir/include/mlir/Dialect/Arith/IR/CMakeLists.txt b/mlir/include/mlir/Dialect/Arith/IR/CMakeLists.txt
--- a/mlir/include/mlir/Dialect/Arith/IR/CMakeLists.txt
+++ b/mlir/include/mlir/Dialect/Arith/IR/CMakeLists.txt
@@ -1,5 +1,14 @@
 set(LLVM_TARGET_DEFINITIONS ArithOps.td)
 mlir_tablegen(ArithOpsEnums.h.inc -gen-enum-decls)
 mlir_tablegen(ArithOpsEnums.cpp.inc -gen-enum-defs)
+mlir_tablegen(ArithOpsAttributes.h.inc -gen-attrdef-decls
+              -attrdefs-dialect=arith)
+mlir_tablegen(ArithOpsAttributes.cpp.inc -gen-attrdef-defs
+              -attrdefs-dialect=arith)
 add_mlir_dialect(ArithOps arith)
 add_mlir_doc(ArithOps ArithOps Dialects/ -gen-dialect-doc)
+
+set(LLVM_TARGET_DEFINITIONS ArithOpsInterfaces.td)
+mlir_tablegen(ArithOpsInterfaces.h.inc -gen-op-interface-decls)
+mlir_tablegen(ArithOpsInterfaces.cpp.inc -gen-op-interface-defs)
+add_public_tablegen_target(MLIRArithOpsInterfacesIncGen)
diff --git a/mlir/include/mlir/Dialect/LLVMIR/LLVMDialect.h b/mlir/include/mlir/Dialect/LLVMIR/LLVMDialect.h
--- a/mlir/include/mlir/Dialect/LLVMIR/LLVMDialect.h
+++ b/mlir/include/mlir/Dialect/LLVMIR/LLVMDialect.h
@@ -47,6 +47,15 @@
 } // namespace LLVM
 } // namespace mlir
 
+namespace mlir {
+namespace LLVM {
+class LoopOptionsAttrBuilder;
+} // namespace LLVM
+} // namespace mlir
+
+#define GET_ATTRDEF_CLASSES
+#include "mlir/Dialect/LLVMIR/LLVMOpsAttrDefs.h.inc"
+
 #include "mlir/Dialect/LLVMIR/LLVMOpsInterfaces.h.inc"
 
 namespace llvm {
@@ -61,7 +70,6 @@
 namespace mlir {
 namespace LLVM {
 class LLVMDialect;
-class LoopOptionsAttrBuilder;
 
 namespace detail {
 struct LLVMTypeStorage;
@@ -70,9 +78,6 @@
 } // namespace LLVM
 } // namespace mlir
 
-#define GET_ATTRDEF_CLASSES
-#include "mlir/Dialect/LLVMIR/LLVMOpsAttrDefs.h.inc"
-
 namespace mlir {
 namespace LLVM {
 template <typename Values>
diff --git a/mlir/include/mlir/Dialect/LLVMIR/LLVMOpsInterfaces.td b/mlir/include/mlir/Dialect/LLVMIR/LLVMOpsInterfaces.td
--- a/mlir/include/mlir/Dialect/LLVMIR/LLVMOpsInterfaces.td
+++ b/mlir/include/mlir/Dialect/LLVMIR/LLVMOpsInterfaces.td
@@ -23,8 +23,28 @@
   let cppNamespace = "::mlir::LLVM";
 
   let methods = [
-    InterfaceMethod<"Get fastmath flags", "::mlir::LLVM::FastmathFlags",
-                    "getFastmathFlags">,
+    InterfaceMethod<
+      /*desc=*/        "Returns a FastmathFlagsAttr attribute for the operation",
+      /*returnType=*/  "FastmathFlagsAttr",
+      /*methodName=*/  "getFastmathAttr",
+      /*args=*/        (ins),
+      /*methodBody=*/  [{}],
+      /*defaultImpl=*/ [{
+        ConcreteOp op = cast<ConcreteOp>(this->getOperation());
+        return op.getFastmathFlagsAttr();
+      }]
+      >,
+    StaticInterfaceMethod<
+      /*desc=*/        [{Returns the name of the FastmathFlagsAttr attribute
+                         for the operation}],
+      /*returnType=*/  "StringRef",
+      /*methodName=*/  "getFastmathAttrName",
+      /*args=*/        (ins),
+      /*methodBody=*/  [{}],
+      /*defaultImpl=*/ [{
+        return "fastmathFlags";
+      }]
+      >
   ];
 }
 
diff --git a/mlir/lib/Conversion/ArithToLLVM/ArithToLLVM.cpp b/mlir/lib/Conversion/ArithToLLVM/ArithToLLVM.cpp
--- a/mlir/lib/Conversion/ArithToLLVM/ArithToLLVM.cpp
+++ b/mlir/lib/Conversion/ArithToLLVM/ArithToLLVM.cpp
@@ -24,16 +24,91 @@
 
 namespace {
 
+// Map arithmetic fastmath enum values to LLVMIR enum values.
+static LLVM::FastmathFlags
+convertArithFastMathFlagsToLLVM(arith::FastMathFlags arithFMF) {
+  LLVM::FastmathFlags llvmFMF{};
+  const std::pair<arith::FastMathFlags, LLVM::FastmathFlags> flags[] = {
+      {arith::FastMathFlags::nnan, LLVM::FastmathFlags::nnan},
+      {arith::FastMathFlags::ninf, LLVM::FastmathFlags::ninf},
+      {arith::FastMathFlags::nsz, LLVM::FastmathFlags::nsz},
+      {arith::FastMathFlags::arcp, LLVM::FastmathFlags::arcp},
+      {arith::FastMathFlags::contract, LLVM::FastmathFlags::contract},
+      {arith::FastMathFlags::afn, LLVM::FastmathFlags::afn},
+      {arith::FastMathFlags::reassoc, LLVM::FastmathFlags::reassoc}};
+  for (auto fmfMap : flags) {
+    if (bitEnumContainsAny(arithFMF, fmfMap.first))
+      llvmFMF = llvmFMF | fmfMap.second;
+  }
+  return llvmFMF;
+}
+
+// Create an LLVM fastmath attribute from a given arithmetic fastmath attribute.
+static LLVM::FastmathFlagsAttr
+convertArithFastMathAttr(arith::FastMathFlagsAttr fmfAttr) {
+  arith::FastMathFlags arithFMF = fmfAttr.getValue();
+  return LLVM::FastmathFlagsAttr::get(
+      fmfAttr.getContext(), convertArithFastMathFlagsToLLVM(arithFMF));
+}
+
+// Attribute converter that populates a NamedAttrList by removing the fastmath
+// attribute from the source operation attributes, and replacing it with an
+// equivalent LLVM fastmath attribute.
+template <typename SourceOp, typename TargetOp> class AttrConvertFastMath {
+public:
+  AttrConvertFastMath(SourceOp srcOp) {
+    // Copy the source attributes.
+    convertedAttr = NamedAttrList{srcOp->getAttrs()};
+    // Get the name of the arith fastmath attribute.
+    llvm::StringRef arithFMFAttrName = SourceOp::getFastMathAttrName();
+    // Remove the source fastmath attribute.
+    auto arithFMFAttr = convertedAttr.erase(arithFMFAttrName)
+                            .dyn_cast_or_null<arith::FastMathFlagsAttr>();
+    if (arithFMFAttr) {
+      llvm::StringRef targetAttrName = TargetOp::getFastmathAttrName();
+      convertedAttr.set(targetAttrName, convertArithFastMathAttr(arithFMFAttr));
+    }
+  }
+
+  ArrayRef<NamedAttribute> getAttrs() const { return convertedAttr.getAttrs(); }
+
+private:
+  NamedAttrList convertedAttr;
+};
+
+// Attribute converter that populates a NamedAttrList by removing the fastmath
+// attribute from the source operation attributes. This may be useful for
+// target operations that do not require the fastmath attribute, or for targets
+// that do not yet support the LLVM fastmath attribute.
+template <typename SourceOp, typename TargetOp> class AttrDropFastMath {
+public:
+  AttrDropFastMath(SourceOp srcOp) {
+    // Copy the source attributes.
+    convertedAttr = NamedAttrList{srcOp->getAttrs()};
+    // Get the name of the arith fastmath attribute.
+    llvm::StringRef arithFMFAttrName = SourceOp::getFastMathAttrName();
+    // Remove the source fastmath attribute.
+    convertedAttr.erase(arithFMFAttrName);
+  }
+
+  ArrayRef<NamedAttribute> getAttrs() const { return convertedAttr.getAttrs(); }
+
+private:
+  NamedAttrList convertedAttr;
+};
+
 //===----------------------------------------------------------------------===//
 // Straightforward Op Lowerings
 //===----------------------------------------------------------------------===//
 
-using AddFOpLowering = VectorConvertToLLVMPattern<arith::AddFOp, LLVM::FAddOp>;
+using AddFOpLowering = VectorConvertToLLVMPattern<arith::AddFOp, LLVM::FAddOp,
+                                                  AttrConvertFastMath>;
 using AddIOpLowering = VectorConvertToLLVMPattern<arith::AddIOp, LLVM::AddOp>;
 using AndIOpLowering = VectorConvertToLLVMPattern<arith::AndIOp, LLVM::AndOp>;
 using BitcastOpLowering =
     VectorConvertToLLVMPattern<arith::BitcastOp, LLVM::BitcastOp>;
-using DivFOpLowering = VectorConvertToLLVMPattern<arith::DivFOp, LLVM::FDivOp>;
+using DivFOpLowering = VectorConvertToLLVMPattern<arith::DivFOp, LLVM::FDivOp,
+                                                  AttrConvertFastMath>;
 using DivSIOpLowering =
     VectorConvertToLLVMPattern<arith::DivSIOp, LLVM::SDivOp>;
 using DivUIOpLowering =
@@ -47,23 +122,31 @@
     VectorConvertToLLVMPattern<arith::FPToSIOp, LLVM::FPToSIOp>;
 using FPToUIOpLowering =
     VectorConvertToLLVMPattern<arith::FPToUIOp, LLVM::FPToUIOp>;
+// TODO: Add LLVM intrinsic support for fastmath
 using MaxFOpLowering =
-    VectorConvertToLLVMPattern<arith::MaxFOp, LLVM::MaxNumOp>;
+    VectorConvertToLLVMPattern<arith::MaxFOp, LLVM::MaxNumOp,
+                               AttrDropFastMath>;
 using MaxSIOpLowering =
     VectorConvertToLLVMPattern<arith::MaxSIOp, LLVM::SMaxOp>;
 using MaxUIOpLowering =
     VectorConvertToLLVMPattern<arith::MaxUIOp, LLVM::UMaxOp>;
+// TODO: Add LLVM intrinsic support for fastmath
 using MinFOpLowering =
-    VectorConvertToLLVMPattern<arith::MinFOp, LLVM::MinNumOp>;
+    VectorConvertToLLVMPattern<arith::MinFOp, LLVM::MinNumOp,
+                               AttrDropFastMath>;
 using MinSIOpLowering =
     VectorConvertToLLVMPattern<arith::MinSIOp, LLVM::SMinOp>;
 using MinUIOpLowering =
     VectorConvertToLLVMPattern<arith::MinUIOp, LLVM::UMinOp>;
-using MulFOpLowering = VectorConvertToLLVMPattern<arith::MulFOp, LLVM::FMulOp>;
+using MulFOpLowering = VectorConvertToLLVMPattern<arith::MulFOp, LLVM::FMulOp,
+                                                  AttrConvertFastMath>;
 using MulIOpLowering = VectorConvertToLLVMPattern<arith::MulIOp, LLVM::MulOp>;
-using NegFOpLowering = VectorConvertToLLVMPattern<arith::NegFOp, LLVM::FNegOp>;
+using NegFOpLowering = VectorConvertToLLVMPattern<arith::NegFOp, LLVM::FNegOp,
+                                                  AttrConvertFastMath>;
 using OrIOpLowering = VectorConvertToLLVMPattern<arith::OrIOp, LLVM::OrOp>;
-using RemFOpLowering = VectorConvertToLLVMPattern<arith::RemFOp, LLVM::FRemOp>;
+// TODO: Add LLVM intrinsic support for fastmath
+using RemFOpLowering =
+    VectorConvertToLLVMPattern<arith::RemFOp, LLVM::FRemOp, AttrDropFastMath>;
 using RemSIOpLowering =
     VectorConvertToLLVMPattern<arith::RemSIOp, LLVM::SRemOp>;
 using RemUIOpLowering =
@@ -77,7 +160,8 @@
     VectorConvertToLLVMPattern<arith::ShRUIOp, LLVM::LShrOp>;
 using SIToFPOpLowering =
     VectorConvertToLLVMPattern<arith::SIToFPOp, LLVM::SIToFPOp>;
-using SubFOpLowering = VectorConvertToLLVMPattern<arith::SubFOp, LLVM::FSubOp>;
+using SubFOpLowering = VectorConvertToLLVMPattern<arith::SubFOp, LLVM::FSubOp,
+                                                  AttrConvertFastMath>;
 using SubIOpLowering = VectorConvertToLLVMPattern<arith::SubIOp, LLVM::SubOp>;
 using TruncFOpLowering =
     VectorConvertToLLVMPattern<arith::TruncFOp, LLVM::FPTruncOp>;
@@ -153,7 +237,7 @@
 ConstantOpLowering::matchAndRewrite(arith::ConstantOp op, OpAdaptor adaptor,
                                     ConversionPatternRewriter &rewriter) const {
   return LLVM::detail::oneToOneRewrite(op, LLVM::ConstantOp::getOperationName(),
-                                       adaptor.getOperands(),
+                                       adaptor.getOperands(), op->getAttrs(),
                                        *getTypeConverter(), rewriter);
 }
 
diff --git a/mlir/lib/Conversion/ComplexToLLVM/ComplexToLLVM.cpp b/mlir/lib/Conversion/ComplexToLLVM/ComplexToLLVM.cpp
--- a/mlir/lib/Conversion/ComplexToLLVM/ComplexToLLVM.cpp
+++ b/mlir/lib/Conversion/ComplexToLLVM/ComplexToLLVM.cpp
@@ -90,7 +90,7 @@
                   ConversionPatternRewriter &rewriter) const override {
     return LLVM::detail::oneToOneRewrite(
         op, LLVM::ConstantOp::getOperationName(), adaptor.getOperands(),
-        *getTypeConverter(), rewriter);
+        op->getAttrs(), *getTypeConverter(), rewriter);
   }
 };
 
diff --git a/mlir/lib/Conversion/LLVMCommon/Pattern.cpp b/mlir/lib/Conversion/LLVMCommon/Pattern.cpp
--- a/mlir/lib/Conversion/LLVMCommon/Pattern.cpp
+++ b/mlir/lib/Conversion/LLVMCommon/Pattern.cpp
@@ -308,7 +308,8 @@
 /// and given operands.
 LogicalResult LLVM::detail::oneToOneRewrite(
     Operation *op, StringRef targetOp, ValueRange operands,
-    LLVMTypeConverter &typeConverter, ConversionPatternRewriter &rewriter) {
+    ArrayRef<NamedAttribute> targetAttrs, LLVMTypeConverter &typeConverter,
+    ConversionPatternRewriter &rewriter) {
   unsigned numResults = op->getNumResults();
 
   SmallVector<Type> resultTypes;
@@ -322,7 +323,7 @@
   // Create the operation through state since we don't know its C++ type.
   Operation *newOp =
       rewriter.create(op->getLoc(), rewriter.getStringAttr(targetOp), operands,
-                      resultTypes, op->getAttrs());
+                      resultTypes, targetAttrs);
 
   // If the operation produced 0 or 1 result, return them immediately.
   if (numResults == 0)
diff --git a/mlir/lib/Conversion/LLVMCommon/VectorPattern.cpp b/mlir/lib/Conversion/LLVMCommon/VectorPattern.cpp
--- a/mlir/lib/Conversion/LLVMCommon/VectorPattern.cpp
+++ b/mlir/lib/Conversion/LLVMCommon/VectorPattern.cpp
@@ -105,7 +105,8 @@
 
 LogicalResult LLVM::detail::vectorOneToOneRewrite(
     Operation *op, StringRef targetOp, ValueRange operands,
-    LLVMTypeConverter &typeConverter, ConversionPatternRewriter &rewriter) {
+    ArrayRef<NamedAttribute> targetAttrs, LLVMTypeConverter &typeConverter,
+    ConversionPatternRewriter &rewriter) {
   assert(!operands.empty());
 
   // Cannot convert ops if their operands are not of LLVM type.
@@ -114,13 +115,14 @@
 
   auto llvmNDVectorTy = operands[0].getType();
   if (!llvmNDVectorTy.isa<LLVM::LLVMArrayType>())
-    return oneToOneRewrite(op, targetOp, operands, typeConverter, rewriter);
+    return oneToOneRewrite(op, targetOp, operands, targetAttrs, typeConverter,
+                           rewriter);
 
-  auto callback = [op, targetOp, &rewriter](Type llvm1DVectorTy,
-                                            ValueRange operands) {
+  auto callback = [op, targetOp, targetAttrs, &rewriter](Type llvm1DVectorTy,
+                                                         ValueRange operands) {
     return rewriter
         .create(op->getLoc(), rewriter.getStringAttr(targetOp), operands,
-                llvm1DVectorTy, op->getAttrs())
+                llvm1DVectorTy, targetAttrs)
         ->getResult(0);
   };
 
diff --git a/mlir/lib/Dialect/Arith/IR/ArithCanonicalization.td b/mlir/lib/Dialect/Arith/IR/ArithCanonicalization.td
--- a/mlir/lib/Dialect/Arith/IR/ArithCanonicalization.td
+++ b/mlir/lib/Dialect/Arith/IR/ArithCanonicalization.td
@@ -215,17 +215,21 @@
 //===----------------------------------------------------------------------===//
 
 // mulf(negf(x), negf(y)) -> mulf(x,y)
+// (retain fastmath flags of original mulf)
 def MulFOfNegF :
-    Pat<(Arith_MulFOp (Arith_NegFOp $x), (Arith_NegFOp $y)), (Arith_MulFOp $x, $y),
-      [(Constraint<CPred<"$0.getType() == $1.getType()">> $x, $y)]>;
+    Pat<(Arith_MulFOp (Arith_NegFOp $x, $_), (Arith_NegFOp $y, $_), $fmf),
+        (Arith_MulFOp $x, $y, $fmf),
+        [(Constraint<CPred<"$0.getType() == $1.getType()">> $x, $y)]>;
 
 //===----------------------------------------------------------------------===//
 // DivFOp
 //===----------------------------------------------------------------------===//
 
 // divf(negf(x), negf(y)) -> divf(x,y)
+// (retain fastmath flags of original divf)
 def DivFOfNegF :
-    Pat<(Arith_DivFOp (Arith_NegFOp $x), (Arith_NegFOp $y)), (Arith_DivFOp $x, $y),
-      [(Constraint<CPred<"$0.getType() == $1.getType()">> $x, $y)]>;
+    Pat<(Arith_DivFOp (Arith_NegFOp $x, $_), (Arith_NegFOp $y, $_), $fmf),
+        (Arith_DivFOp $x, $y, $fmf),
+        [(Constraint<CPred<"$0.getType() == $1.getType()">> $x, $y)]>;
 
 #endif // ARITH_PATTERNS
diff --git a/mlir/lib/Dialect/Arith/IR/ArithDialect.cpp b/mlir/lib/Dialect/Arith/IR/ArithDialect.cpp
--- a/mlir/lib/Dialect/Arith/IR/ArithDialect.cpp
+++ b/mlir/lib/Dialect/Arith/IR/ArithDialect.cpp
@@ -8,12 +8,17 @@
 
 #include "mlir/Dialect/Arith/IR/Arith.h"
 #include "mlir/IR/Builders.h"
+#include "mlir/IR/DialectImplementation.h"
 #include "mlir/Transforms/InliningUtils.h"
+#include "llvm/ADT/TypeSwitch.h"
 
 using namespace mlir;
 using namespace mlir::arith;
 
 #include "mlir/Dialect/Arith/IR/ArithOpsDialect.cpp.inc"
+#include "mlir/Dialect/Arith/IR/ArithOpsInterfaces.cpp.inc"
+#define GET_ATTRDEF_CLASSES
+#include "mlir/Dialect/Arith/IR/ArithOpsAttributes.cpp.inc"
 
 namespace {
 /// This class defines the interface for handling inlining for arithmetic
@@ -34,6 +39,10 @@
 #define GET_OP_LIST
 #include "mlir/Dialect/Arith/IR/ArithOps.cpp.inc"
       >();
+  addAttributes<
+#define GET_ATTRDEF_LIST
+#include "mlir/Dialect/Arith/IR/ArithOpsAttributes.cpp.inc"
+      >();
   addInterfaces<ArithInlinerInterface>();
 }
 
diff --git a/mlir/lib/Dialect/Arith/IR/ArithOps.cpp b/mlir/lib/Dialect/Arith/IR/ArithOps.cpp
--- a/mlir/lib/Dialect/Arith/IR/ArithOps.cpp
+++ b/mlir/lib/Dialect/Arith/IR/ArithOps.cpp
@@ -23,6 +23,31 @@
 using namespace mlir;
 using namespace mlir::arith;
 
+//===----------------------------------------------------------------------===//
+// Floating point op parse/print helpers
+//===----------------------------------------------------------------------===//
+static ParseResult parseArithFastMathAttr(OpAsmParser &parser,
+                                          Attribute &attr) {
+  if (succeeded(
+          parser.parseOptionalKeyword(FastMathFlagsAttr::getMnemonic()))) {
+    attr = FastMathFlagsAttr::parse(parser, Type{});
+    return success(static_cast<bool>(attr));
+  } else {
+    // No fastmath attribute mnemonic present - defer attribute creation and use
+    // the default value.
+    return success();
+  }
+}
+
+static void printArithFastMathAttr(OpAsmPrinter &printer, Operation *op,
+                                   FastMathFlagsAttr fmAttr) {
+  // Elide printing the fastmath attribute when fastmath=none
+  if (fmAttr && (fmAttr.getValue() != FastMathFlags::none)) {
+    printer << " " << FastMathFlagsAttr::getMnemonic();
+    fmAttr.print(printer);
+  }
+}
+
 //===----------------------------------------------------------------------===//
 // Pattern helpers
 //===----------------------------------------------------------------------===//
diff --git a/mlir/lib/Dialect/Arith/IR/CMakeLists.txt b/mlir/lib/Dialect/Arith/IR/CMakeLists.txt
--- a/mlir/lib/Dialect/Arith/IR/CMakeLists.txt
+++ b/mlir/lib/Dialect/Arith/IR/CMakeLists.txt
@@ -12,6 +12,7 @@
 
   DEPENDS
   MLIRArithOpsIncGen
+  MLIRArithOpsInterfacesIncGen
 
   LINK_LIBS PUBLIC
   MLIRDialect
diff --git a/mlir/lib/Dialect/X86Vector/Transforms/LegalizeForLLVMExport.cpp b/mlir/lib/Dialect/X86Vector/Transforms/LegalizeForLLVMExport.cpp
--- a/mlir/lib/Dialect/X86Vector/Transforms/LegalizeForLLVMExport.cpp
+++ b/mlir/lib/Dialect/X86Vector/Transforms/LegalizeForLLVMExport.cpp
@@ -51,13 +51,13 @@
     Type elementType = getSrcVectorElementType<OpTy>(op);
     unsigned bitwidth = elementType.getIntOrFloatBitWidth();
     if (bitwidth == 32)
-      return LLVM::detail::oneToOneRewrite(op, Intr32OpTy::getOperationName(),
-                                           adaptor.getOperands(),
-                                           getTypeConverter(), rewriter);
+      return LLVM::detail::oneToOneRewrite(
+          op, Intr32OpTy::getOperationName(), adaptor.getOperands(),
+          op->getAttrs(), getTypeConverter(), rewriter);
     if (bitwidth == 64)
-      return LLVM::detail::oneToOneRewrite(op, Intr64OpTy::getOperationName(),
-                                           adaptor.getOperands(),
-                                           getTypeConverter(), rewriter);
+      return LLVM::detail::oneToOneRewrite(
+          op, Intr64OpTy::getOperationName(), adaptor.getOperands(),
+          op->getAttrs(), getTypeConverter(), rewriter);
     return rewriter.notifyMatchFailure(
         op, "expected 'src' to be either f32 or f64");
   }
diff --git a/mlir/lib/Target/LLVMIR/Dialect/LLVMIR/LLVMToLLVMIRTranslation.cpp b/mlir/lib/Target/LLVMIR/Dialect/LLVMIR/LLVMToLLVMIRTranslation.cpp
--- a/mlir/lib/Target/LLVMIR/Dialect/LLVMIR/LLVMToLLVMIRTranslation.cpp
+++ b/mlir/lib/Target/LLVMIR/Dialect/LLVMIR/LLVMToLLVMIRTranslation.cpp
@@ -160,9 +160,9 @@
       // clang-format on
   };
   llvm::FastMathFlags ret;
-  auto fmf = op.getFastmathFlags();
+  ::mlir::LLVM::FastmathFlags fmfMlir = op.getFastmathAttr().getValue();
   for (auto it : handlers)
-    if (bitEnumContainsAll(fmf, it.first))
+    if (bitEnumContainsAll(fmfMlir, it.first))
       (ret.*(it.second))(true);
   return ret;
 }
diff --git a/mlir/test/CAPI/ir.c b/mlir/test/CAPI/ir.c
--- a/mlir/test/CAPI/ir.c
+++ b/mlir/test/CAPI/ir.c
@@ -309,7 +309,7 @@
   // clang-format off
   // CHECK-LABEL: @stats
   // CHECK: Number of operations: 12
-  // CHECK: Number of attributes: 4
+  // CHECK: Number of attributes: 5
   // CHECK: Number of blocks: 3
   // CHECK: Number of regions: 3
   // CHECK: Number of values: 9
diff --git a/mlir/test/Conversion/ArithToLLVM/arith-to-llvm.mlir b/mlir/test/Conversion/ArithToLLVM/arith-to-llvm.mlir
--- a/mlir/test/Conversion/ArithToLLVM/arith-to-llvm.mlir
+++ b/mlir/test/Conversion/ArithToLLVM/arith-to-llvm.mlir
@@ -448,3 +448,20 @@
   %1 = arith.maxf %arg0, %arg1 : f32
   return %0 : f32
 }
+
+// -----
+
+// CHECK-LABEL: @fastmath
+func.func @fastmath(%arg0: f32, %arg1: f32, %arg2: i32) {
+// CHECK: {{.*}} = llvm.fadd %arg0, %arg1  {fastmathFlags = #llvm.fastmath<fast>} : f32
+// CHECK: {{.*}} = llvm.fmul %arg0, %arg1  {fastmathFlags = #llvm.fastmath<fast>} : f32
+// CHECK: {{.*}} = llvm.fneg %arg0  {fastmathFlags = #llvm.fastmath<fast>} : f32
+// CHECK: {{.*}} = llvm.fadd %arg0, %arg1  : f32
+// CHECK: {{.*}} = llvm.fadd %arg0, %arg1  {fastmathFlags = #llvm.fastmath<nnan, ninf>} : f32
+  %0 = arith.addf %arg0, %arg1 fastmath<fast> : f32
+  %1 = arith.mulf %arg0, %arg1 fastmath<fast> : f32
+  %2 = arith.negf %arg0 fastmath<fast> : f32
+  %3 = arith.addf %arg0, %arg1 fastmath<none> : f32
+  %4 = arith.addf %arg0, %arg1 fastmath<nnan,ninf> : f32
+  return
+}
diff --git a/mlir/test/Dialect/Arith/ops.mlir b/mlir/test/Dialect/Arith/ops.mlir
--- a/mlir/test/Dialect/Arith/ops.mlir
+++ b/mlir/test/Dialect/Arith/ops.mlir
@@ -1031,3 +1031,27 @@
   %min_unsigned = arith.minui %i1, %i2 : i32
   return
 }
+
+// CHECK-LABEL: @fastmath
+func.func @fastmath(%arg0: f32, %arg1: f32, %arg2: i32) {
+// CHECK: {{.*}} = arith.addf %arg0, %arg1 fastmath<fast> : f32
+// CHECK: {{.*}} = arith.subf %arg0, %arg1 fastmath<fast> : f32
+// CHECK: {{.*}} = arith.mulf %arg0, %arg1 fastmath<fast> : f32
+// CHECK: {{.*}} = arith.divf %arg0, %arg1 fastmath<fast> : f32
+// CHECK: {{.*}} = arith.remf %arg0, %arg1 fastmath<fast> : f32
+// CHECK: {{.*}} = arith.negf %arg0 fastmath<fast> : f32
+  %0 = arith.addf %arg0, %arg1 fastmath<fast> : f32
+  %1 = arith.subf %arg0, %arg1 fastmath<fast> : f32
+  %2 = arith.mulf %arg0, %arg1 fastmath<fast> : f32
+  %3 = arith.divf %arg0, %arg1 fastmath<fast> : f32
+  %4 = arith.remf %arg0, %arg1 fastmath<fast> : f32
+  %5 = arith.negf %arg0 fastmath<fast> : f32
+// CHECK: {{.*}} = arith.addf %arg0, %arg1 : f32
+  %6 = arith.addf %arg0, %arg1 fastmath<none> : f32
+// CHECK: {{.*}} = arith.addf %arg0, %arg1 fastmath<nnan,ninf> : f32
+  %7 = arith.addf %arg0, %arg1 fastmath<nnan,ninf> : f32
+// CHECK: {{.*}} = arith.mulf %arg0, %arg1 fastmath<fast> : f32
+  %8 = arith.mulf %arg0, %arg1 fastmath<reassoc,nnan,ninf,nsz,arcp,contract,afn> : f32
+
+  return
+}
diff --git a/mlir/test/Dialect/Linalg/invalid.mlir b/mlir/test/Dialect/Linalg/invalid.mlir
--- a/mlir/test/Dialect/Linalg/invalid.mlir
+++ b/mlir/test/Dialect/Linalg/invalid.mlir
@@ -270,7 +270,7 @@
 // -----
 
 func.func @generic(%arg0: memref<?x?xf32>) {
-  // expected-error @+6 {{block with no terminator, has %0 = "arith.addf"(%arg1, %arg1) : (f32, f32) -> f32}}
+  // expected-error @+6 {{block with no terminator, has %0 = "arith.addf"(%arg1, %arg1) {fastmath = #arith.fastmath<none>} : (f32, f32) -> f32}}
   linalg.generic  {
     indexing_maps = [ affine_map<(i, j) -> (i, j)> ],
     iterator_types = ["parallel", "parallel"]}
diff --git a/mlir/tools/mlir-tblgen/OpFormatGen.cpp b/mlir/tools/mlir-tblgen/OpFormatGen.cpp
--- a/mlir/tools/mlir-tblgen/OpFormatGen.cpp
+++ b/mlir/tools/mlir-tblgen/OpFormatGen.cpp
@@ -1001,7 +1001,7 @@
   for (FormatElement *param : dir->getArguments()) {
     if (auto *attr = dyn_cast<AttributeVariable>(param)) {
       const NamedAttribute *var = attr->getVar();
-      if (var->attr.isOptional())
+      if (var->attr.isOptional() || var->attr.hasDefaultValue())
         body << llvm::formatv("    if ({0}Attr)\n  ", var->name);
 
       body << llvm::formatv("    result.addAttribute(\"{0}\", {0}Attr);\n",