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

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; RUN: llvm-as < %s | llc -march=x86 | not grep call
declare i1 @llvm.isunordered.f64(double)
define i1 @test_isnan(double %X) {
%R = fcmp uno double %X, %X ; <i1> [#uses=1]
ret i1 %R
}