llvm-project/llvm/test/Regression/CodeGen/X86/isnan.llx

; RUN: llvm-as < %s | llc -march=x86 | not grep call
declare bool %llvm.isunordered(double)

bool %test_isnan(double %X) {
	%R = call bool %llvm.isunordered(double %X, double %X)
	ret bool %R
}