1; LoopSimplify is breaking LICM on this testcase because the exit blocks from 2; the loop are reachable from more than just the exit nodes: the exit blocks 3; have predecessors from outside of the loop! 4; 5; This is distilled from a monsterous crafty example. 6 7; RUN: opt < %s -licm -disable-output 8 9 10@G = weak global i32 0 ; <i32*> [#uses=7] 11 12define i32 @main() { 13entry: 14 store i32 123, i32* @G 15 br label %loopentry.i 16loopentry.i: ; preds = %endif.1.i, %entry 17 %tmp.0.i = load i32, i32* @G ; <i32> [#uses=1] 18 %tmp.1.i = icmp eq i32 %tmp.0.i, 123 ; <i1> [#uses=1] 19 br i1 %tmp.1.i, label %Out.i, label %endif.0.i 20endif.0.i: ; preds = %loopentry.i 21 %tmp.3.i = load i32, i32* @G ; <i32> [#uses=1] 22 %tmp.4.i = icmp eq i32 %tmp.3.i, 126 ; <i1> [#uses=1] 23 br i1 %tmp.4.i, label %ExitBlock.i, label %endif.1.i 24endif.1.i: ; preds = %endif.0.i 25 %tmp.6.i = load i32, i32* @G ; <i32> [#uses=1] 26 %inc.i = add i32 %tmp.6.i, 1 ; <i32> [#uses=1] 27 store i32 %inc.i, i32* @G 28 br label %loopentry.i 29Out.i: ; preds = %loopentry.i 30 store i32 0, i32* @G 31 br label %ExitBlock.i 32ExitBlock.i: ; preds = %Out.i, %endif.0.i 33 %tmp.7.i = load i32, i32* @G ; <i32> [#uses=1] 34 ret i32 %tmp.7.i 35} 36 37