diff --git a/test/CodeGen/X86/isnan.llx b/test/CodeGen/X86/isnan.llx
new file mode 100644
index 00000000000..eb7bed36282
--- /dev/null
+++ b/test/CodeGen/X86/isnan.llx
@@ -0,0 +1,7 @@
+; RUN: llvm-as < %s | llc -march=x86 | not grep call
+declare bool %llvm.isnan(double)
+
+bool %test_isnan(double %X) {
+	%R = call bool %llvm.isnan(double %X)
+	ret bool %R
+}