Index: llvm/trunk/lib/Target/WebAssembly/AsmParser/WebAssemblyAsmParser.cpp
===================================================================
--- llvm/trunk/lib/Target/WebAssembly/AsmParser/WebAssemblyAsmParser.cpp
+++ llvm/trunk/lib/Target/WebAssembly/AsmParser/WebAssemblyAsmParser.cpp
@@ -303,7 +303,7 @@
     // assembly, so we add a dummy one explicitly (since we have no control
     // over signature tables here, we assume these will be regenerated when
     // the wasm module is generated).
-    if (BaseName == "block" || BaseName == "loop") {
+    if (BaseName == "block" || BaseName == "loop" || BaseName == "try") {
       Operands.push_back(make_unique<WebAssemblyOperand>(
           WebAssemblyOperand::Integer, NameLoc, NameLoc,
           WebAssemblyOperand::IntOp{-1}));
Index: llvm/trunk/test/MC/WebAssembly/basic-assembly.s
===================================================================
--- llvm/trunk/test/MC/WebAssembly/basic-assembly.s
+++ llvm/trunk/test/MC/WebAssembly/basic-assembly.s
@@ -1,4 +1,4 @@
-# RUN: llvm-mc -triple=wasm32-unknown-unknown -mattr=+simd128,+nontrapping-fptoint < %s | FileCheck %s
+# RUN: llvm-mc -triple=wasm32-unknown-unknown -mattr=+simd128,+nontrapping-fptoint,+exception-handling < %s | FileCheck %s
 
     .text
     .type    test0,@function
@@ -46,6 +46,13 @@
     # TODO: enable once instruction has been added.
     #i32x4.trunc_s/f32x4:sat
     i32.trunc_s/f32
+    try
+.LBB0_3:
+    i32.catch   0
+.LBB0_4:
+    catch_all
+.LBB0_5:
+    end_try
     #i32.trunc_s:sat/f32
     get_global  __stack_pointer@GLOBAL
     end_function
@@ -88,5 +95,12 @@
 # CHECK-NEXT:      get_local   5
 # CHECK-NEXT:      f32x4.add
 # CHECK-NEXT:      i32.trunc_s/f32
+# CHECK-NEXT:      try
+# CHECK-NEXT:  .LBB0_3:
+# CHECK-NEXT:      i32.catch   0
+# CHECK-NEXT:  .LBB0_4:
+# CHECK-NEXT:      catch_all
+# CHECK-NEXT:  .LBB0_5:
+# CHECK-NEXT:      end_try
 # CHECK-NEXT:      get_global  __stack_pointer@GLOBAL
 # CHECK-NEXT:      end_function