1; This testcase causes an infinite loop in the instruction combiner, 2; because it things that the constant value is a not expression... and 3; constantly inverts the branch back and forth. 4; 5; RUN: opt < %s -passes=instcombine -disable-output 6 7define i8 @test19(i1 %c) { 8 br i1 true, label %True, label %False 9 10True: ; preds = %0 11 ret i8 1 12 13False: ; preds = %0 14 ret i8 3 15} 16 17