| ; RUN: opt -jump-threading -S < %s | FileCheck %s |
| ; RUN: opt -passes=jump-threading -S < %s | FileCheck %s |
| ; Check the unreachable loop won't cause infinite loop |
| ; in jump-threading when it tries to update the predecessors' |
| ; profile metadata from a phi node. |
| |
| define void @unreachable_single_bb_loop() { |
| ; CHECK-LABEL: @unreachable_single_bb_loop() |
| bb: |
| %tmp = call i32 @a() |
| %tmp1 = icmp eq i32 %tmp, 1 |
| br i1 %tmp1, label %bb5, label %bb8 |
| |
| ; unreachable single bb loop. |
| bb2: ; preds = %bb2 |
| %tmp4 = icmp ne i32 %tmp, 1 |
| switch i1 %tmp4, label %bb2 [ |
| i1 0, label %bb5 |
| i1 1, label %bb8 |
| ] |
| |
| bb5: ; preds = %bb2, %bb |
| %tmp6 = phi i1 [ %tmp1, %bb ], [ false, %bb2 ] |
| br i1 %tmp6, label %bb8, label %bb7, !prof !0 |
| |
| bb7: ; preds = %bb5 |
| br label %bb8 |
| |
| bb8: ; preds = %bb8, %bb7, %bb5, %bb2 |
| ret void |
| } |
| |
| define void @unreachable_multi_bbs_loop() { |
| ; CHECK-LABEL: @unreachable_multi_bbs_loop() |
| bb: |
| %tmp = call i32 @a() |
| %tmp1 = icmp eq i32 %tmp, 1 |
| br i1 %tmp1, label %bb5, label %bb8 |
| |
| ; unreachable two bbs loop. |
| bb3: ; preds = %bb2 |
| br label %bb2 |
| |
| bb2: ; preds = %bb3 |
| %tmp4 = icmp ne i32 %tmp, 1 |
| switch i1 %tmp4, label %bb3 [ |
| i1 0, label %bb5 |
| i1 1, label %bb8 |
| ] |
| |
| bb5: ; preds = %bb2, %bb |
| %tmp6 = phi i1 [ %tmp1, %bb ], [ false, %bb2 ] |
| br i1 %tmp6, label %bb8, label %bb7, !prof !0 |
| |
| bb7: ; preds = %bb5 |
| br label %bb8 |
| |
| bb8: ; preds = %bb8, %bb7, %bb5, %bb2 |
| ret void |
| } |
| declare i32 @a() |
| |
| !0 = !{!"branch_weights", i32 2146410443, i32 1073205} |
