llvm-project/llvm/test/Transforms/GlobalDCE/2003-07-01-SelfReference.ll

; distilled from 255.vortex
; RUN: opt %s -globaldce -S | not grep testfunc

declare i1 ()* @getfunc()

define internal i1 @testfunc() {
        %F = call i1 ()* ()* @getfunc( )                ; <i1 ()*> [#uses=1]
        %c = icmp eq i1 ()* %F, @testfunc               ; <i1> [#uses=1]
        ret i1 %c
}