diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp b/llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp
--- a/llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp
@@ -149,7 +149,7 @@
         setOperationAction(Op, T, Legal);
 
     // Support integer abs
-    for (auto T : {MVT::v16i8, MVT::v8i16, MVT::v4i32})
+    for (auto T : {MVT::v16i8, MVT::v8i16, MVT::v4i32, MVT::v2i64})
       setOperationAction(ISD::ABS, T, Legal);
 
     // Custom lower BUILD_VECTORs to minimize number of replace_lanes
diff --git a/llvm/test/CodeGen/WebAssembly/simd-arith.ll b/llvm/test/CodeGen/WebAssembly/simd-arith.ll
--- a/llvm/test/CodeGen/WebAssembly/simd-arith.ll
+++ b/llvm/test/CodeGen/WebAssembly/simd-arith.ll
@@ -968,6 +968,18 @@
   ret <2 x i64> %a
 }
 
+; CHECK-LABEL: abs_v2i64:
+; NO-SIMD128-NOT: i64x2:
+; SIMD128-NEXT: .functype abs_v2i64 (v128) -> (v128){{$}}
+; SIMD128-NEXT: i64x2.abs $push[[R:[0-9]+]]=, $0{{$}}
+; SIMD128-NEXT: return $pop[[R]]{{$}}
+define <2 x i64> @abs_v2i64(<2 x i64> %x) {
+  %a = sub <2 x i64> zeroinitializer, %x
+  %b = icmp slt <2 x i64> %x, zeroinitializer
+  %c = select <2 x i1> %b, <2 x i64> %a, <2 x i64> %x
+  ret <2 x i64> %c
+}
+
 ; CHECK-LABEL: neg_v2i64:
 ; NO-SIMD128-NOT: i64x2
 ; SIMD128-NEXT: .functype neg_v2i64 (v128) -> (v128){{$}}