| ; RUN: opt < %s -loop-unswitch -stats -disable-output |& grep "1 loop-unswitch - Number of branches unswitched" | count 1 |
| ; PR 3170 |
| define i32 @a(i32 %x, i32 %y) nounwind { |
| entry: |
| %0 = icmp ult i32 0, %y ; <i1> [#uses=1] |
| br i1 %0, label %bb.nph, label %bb4 |
| |
| bb.nph: ; preds = %entry |
| %1 = icmp eq i32 %x, 0 ; <i1> [#uses=1] |
| br label %bb |
| |
| bb: ; preds = %bb.nph, %bb3 |
| %i.01 = phi i32 [ %3, %bb3 ], [ 0, %bb.nph ] ; <i32> [#uses=1] |
| br i1 %1, label %bb2, label %bb1 |
| |
| bb1: ; preds = %bb |
| %2 = tail call i32 (...)* @b() nounwind ; <i32> [#uses=0] |
| br label %bb2 |
| |
| bb2: ; preds = %bb, %bb1 |
| %3 = add i32 %i.01, 1 ; <i32> [#uses=2] |
| br label %bb3 |
| |
| bb3: ; preds = %bb2 |
| %i.0 = phi i32 [ %3, %bb2 ] ; <i32> [#uses=1] |
| %4 = icmp ult i32 %i.0, %y ; <i1> [#uses=1] |
| br i1 %4, label %bb, label %bb3.bb4_crit_edge |
| |
| bb3.bb4_crit_edge: ; preds = %bb3 |
| br label %bb4 |
| |
| bb4: ; preds = %bb3.bb4_crit_edge, %entry |
| ret i32 0 |
| } |
| |
| declare i32 @b(...) |