diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyRuntimeLibcallSignatures.cpp b/llvm/lib/Target/WebAssembly/WebAssemblyRuntimeLibcallSignatures.cpp
--- a/llvm/lib/Target/WebAssembly/WebAssemblyRuntimeLibcallSignatures.cpp
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyRuntimeLibcallSignatures.cpp
@@ -178,6 +178,9 @@
     Table[RTLIB::SQRT_F32] = f32_func_f32;
     Table[RTLIB::SQRT_F64] = f64_func_f64;
     Table[RTLIB::SQRT_F128] = func_iPTR_i64_i64;
+    Table[RTLIB::CBRT_F32] = f32_func_f32;
+    Table[RTLIB::CBRT_F64] = f64_func_f64;
+    Table[RTLIB::CBRT_F128] = func_iPTR_i64_i64;
     Table[RTLIB::LOG_F32] = f32_func_f32;
     Table[RTLIB::LOG_F64] = f64_func_f64;
     Table[RTLIB::LOG_F128] = func_iPTR_i64_i64;
diff --git a/llvm/test/CodeGen/WebAssembly/libcalls.ll b/llvm/test/CodeGen/WebAssembly/libcalls.ll
--- a/llvm/test/CodeGen/WebAssembly/libcalls.ll
+++ b/llvm/test/CodeGen/WebAssembly/libcalls.ll
@@ -73,9 +73,11 @@
  %e = call double @llvm.log.f64(double %d)
  ; CHECK: f64.call $push{{[0-9]}}=, exp
  %f = call double @llvm.exp.f64(double %e)
+ ; CHECK: f64.call $push{{[0-9]}}=, cbrt
+ %g = call fast double @llvm.pow.f64(double %f, double 0x3FD5555555555555)
  ; CHECK: i32.call $push{{[0-9]}}=, lround
- %g = call i32 @llvm.lround(double %f)
- ret i32 %g
+ %h = call i32 @llvm.lround(double %g)
+ ret i32 %h
 }
 
 ; fcmp ord and unord (RTLIB::O_F32 / RTLIB::UO_F32 etc) are a special case (see