llvm-project/llvm/test/Regression/CodeGen/CBackend/2004-02-26-FPNotPrintableConstants.llx

; This is a non-normal FP value: it's a nan.
; RUN: llvm-as < %s | llc -march=c | grep FPConstant | grep static

float %func () {
  ret float 0xFF20000000000000
}