diff --git a/compiler-rt/lib/builtins/CMakeLists.txt b/compiler-rt/lib/builtins/CMakeLists.txt
--- a/compiler-rt/lib/builtins/CMakeLists.txt
+++ b/compiler-rt/lib/builtins/CMakeLists.txt
@@ -144,6 +144,7 @@
   powidf2.c
   powisf2.c
   powitf2.c
+  powixf2.c
   subdf3.c
   subsf3.c
   subvdi3.c
@@ -248,7 +249,6 @@
   floatundixf.c
   floatuntixf.c
   mulxc3.c
-  powixf2.c
 )
 
 if (NOT MSVC)
diff --git a/compiler-rt/lib/builtins/powitf2.c b/compiler-rt/lib/builtins/powitf2.c
--- a/compiler-rt/lib/builtins/powitf2.c
+++ b/compiler-rt/lib/builtins/powitf2.c
@@ -12,7 +12,7 @@
 
 #include "int_lib.h"
 
-#if _ARCH_PPC
+#if defined(_ARCH_PPC) || defined(__wasm__)
 
 // Returns: a ^ b
 
diff --git a/compiler-rt/test/builtins/Unit/powitf2_test.c b/compiler-rt/test/builtins/Unit/powitf2_test.c
--- a/compiler-rt/test/builtins/Unit/powitf2_test.c
+++ b/compiler-rt/test/builtins/Unit/powitf2_test.c
@@ -14,7 +14,8 @@
 
 #include <stdio.h>
 
-#if _ARCH_PPC
+// `long double` is 128 bits wide on ppc and wasm
+#if defined (_ARCH_PPC) || defined (__wasm__)
 
 #include "int_lib.h"
 #include <math.h>
@@ -37,7 +38,7 @@
 
 int main()
 {
-#if _ARCH_PPC
+#if defined(_ARCH_PPC) || defined (__wasm__)
     if (test__powitf2(0, 0, 1))
         return 1;
     if (test__powitf2(1, 0, 1))