diff --git a/builtins.cpp b/builtins.cpp
index c2422ead..d42ef4b2 100644
--- a/builtins.cpp
+++ b/builtins.cpp
@@ -467,6 +467,7 @@ lSetInternalFunctions(llvm::Module *module) {
         "__num_cores",
         "__packed_load_active",
         "__packed_store_active",
+        "__pause",
         "__popcnt_int32",
         "__popcnt_int64",
         "__prefetch_read_uniform_1",
diff --git a/builtins/util.m4 b/builtins/util.m4
index 0cac6718..2d2918db 100644
--- a/builtins/util.m4
+++ b/builtins/util.m4
@@ -1603,6 +1603,11 @@ declare void @ISPCInstrument(i8*, i8*, i32, i64) nounwind
 declare i1 @__is_compile_time_constant_mask(<WIDTH x MASK> %mask)
 declare i1 @__is_compile_time_constant_varying_int32(<WIDTH x i32>)
 
+define void @__pause() nounwind readnone {
+  call void asm sideeffect "pause", "~{dirflag},~{fpsr},~{flags}"() nounwind
+  ret void
+}
+
 ; This function declares placeholder masked store functions for the
 ;  front-end to use.
 ;