1 ; RUN: opt < %s -iv-users -S -disable-output 2 ; RUN: opt < %s -passes='require<ivusers>' -S -disable-output 3 ; 4 ; PR12868: Infinite recursion: 5 ; getUDivExpr()->getZeroExtendExpr()->isLoopBackedgeGuardedBy() 6 ; 7 ; We actually want SCEV simplification to fail gracefully in this 8 ; case, so there's no output to check, just the absence of stack overflow. 9 10 @c = common global i8 0, align 1 11 12 define i32 @func() { 13 entry: 14 br label %for.cond 15 16 for.cond: ; preds = %for.body, %entry 17 %storemerge = phi i8 [ -1, %entry ], [ %inc, %for.body ] 18 %ui.0 = phi i32 [ undef, %entry ], [ %div, %for.body ] 19 %tobool = icmp eq i8 %storemerge, 0 20 br i1 %tobool, label %for.end, label %for.body 21 22 for.body: ; preds = %for.cond 23 %conv = sext i8 %storemerge to i32 24 %div = lshr i32 %conv, 1 25 %tobool2 = icmp eq i32 %div, 0 26 %inc = add i8 %storemerge, 1 27 br i1 %tobool2, label %for.cond, label %for.end 28 29 for.end: ; preds = %for.body, %for.cond 30 ret i32 0 31 } 32
