1 ; RUN: opt < %s -iv-users -S -disable-output 2 ; 3 ; PR12868: Infinite recursion: 4 ; getUDivExpr()->getZeroExtendExpr()->isLoopBackedgeGuardedBy() 5 ; 6 ; We actually want SCEV simplification to fail gracefully in this 7 ; case, so there's no output to check, just the absence of stack overflow. 8 9 @c = common global i8 0, align 1 10 11 define i32 @func() { 12 entry: 13 br label %for.cond 14 15 for.cond: ; preds = %for.body, %entry 16 %storemerge = phi i8 [ -1, %entry ], [ %inc, %for.body ] 17 %ui.0 = phi i32 [ undef, %entry ], [ %div, %for.body ] 18 %tobool = icmp eq i8 %storemerge, 0 19 br i1 %tobool, label %for.end, label %for.body 20 21 for.body: ; preds = %for.cond 22 %conv = sext i8 %storemerge to i32 23 %div = lshr i32 %conv, 1 24 %tobool2 = icmp eq i32 %div, 0 25 %inc = add i8 %storemerge, 1 26 br i1 %tobool2, label %for.cond, label %for.end 27 28 for.end: ; preds = %for.body, %for.cond 29 ret i32 0 30 } 31
