| ; RUN: opt < %s -passes='require<iv-users>' -S -disable-output |
| ; |
| ; PR12868: Infinite recursion: |
| ; getUDivExpr()->getZeroExtendExpr()->isLoopBackedgeGuardedBy() |
| ; |
| ; We actually want SCEV simplification to fail gracefully in this |
| ; case, so there's no output to check, just the absence of stack overflow. |
| |
| @c = common global i8 0, align 1 |
| |
| define i32 @func() { |
| entry: |
| br label %for.cond |
| |
| for.cond: ; preds = %for.body, %entry |
| %storemerge = phi i8 [ -1, %entry ], [ %inc, %for.body ] |
| %ui.0 = phi i32 [ undef, %entry ], [ %div, %for.body ] |
| %tobool = icmp eq i8 %storemerge, 0 |
| br i1 %tobool, label %for.end, label %for.body |
| |
| for.body: ; preds = %for.cond |
| %conv = sext i8 %storemerge to i32 |
| %div = lshr i32 %conv, 1 |
| %tobool2 = icmp eq i32 %div, 0 |
| %inc = add i8 %storemerge, 1 |
| br i1 %tobool2, label %for.cond, label %for.end |
| |
| for.end: ; preds = %for.body, %for.cond |
| ret i32 0 |
| } |
