| Michael Zolotukhin | 6bc56d5 | 2016-07-20 01:55:27 +0000 | [diff] [blame] | 1 | ; RUN: opt < %s -lcssa -S -o - | FileCheck %s |
| 2 | target triple = "x86_64-unknown-linux-gnu" |
| 3 | |
| 4 | ; PR28424 |
| 5 | ; Here LCSSA adds phi-nodes for %x into the loop exits. Then, SSAUpdater needs |
| 6 | ; to insert phi-nodes to merge these values. That creates a new def, which in |
| 7 | ; its turn needs another LCCSA phi-node, and this test ensures that we insert |
| 8 | ; it. |
| 9 | |
| 10 | ; CHECK-LABEL: @foo1 |
| 11 | define internal i32 @foo1() { |
| 12 | entry: |
| 13 | br label %header |
| 14 | |
| 15 | header: |
| 16 | %x = add i32 0, 1 |
| 17 | br i1 undef, label %if, label %loopexit1 |
| 18 | |
| 19 | if: |
| 20 | br i1 undef, label %latch, label %loopexit2 |
| 21 | |
| 22 | latch: |
| 23 | br i1 undef, label %header, label %loopexit3 |
| 24 | |
| 25 | ; CHECK: loopexit1: |
| 26 | ; CHECK: %x.lcssa = phi i32 [ %x, %header ] |
| 27 | loopexit1: |
| 28 | br label %loop_with_insert_point |
| 29 | |
| 30 | ; CHECK: loopexit2: |
| 31 | ; CHECK: %x.lcssa1 = phi i32 [ %x, %if ] |
| 32 | loopexit2: |
| 33 | br label %exit |
| 34 | |
| 35 | ; CHECK: loopexit3: |
| 36 | ; CHECK: %x.lcssa2 = phi i32 [ %x, %latch ] |
| 37 | loopexit3: |
| 38 | br label %loop_with_insert_point |
| 39 | |
| 40 | ; CHECK: loop_with_insert_point: |
| 41 | ; CHECK: %x4 = phi i32 [ %x4, %loop_with_insert_point ], [ %x.lcssa2, %loopexit3 ], [ %x.lcssa, %loopexit1 ] |
| 42 | loop_with_insert_point: |
| 43 | br i1 undef, label %loop_with_insert_point, label %bb |
| 44 | |
| 45 | ; CHECK: bb: |
| 46 | ; CHECK: %x4.lcssa = phi i32 [ %x4, %loop_with_insert_point ] |
| 47 | bb: |
| 48 | br label %exit |
| 49 | |
| 50 | ; CHECK: exit: |
| 51 | ; CHECK: %x3 = phi i32 [ %x4.lcssa, %bb ], [ %x.lcssa1, %loopexit2 ] |
| 52 | exit: |
| 53 | ret i32 %x |
| 54 | } |
| 55 | |
| 56 | ; CHECK-LABEL: @foo2 |
| 57 | define internal i32 @foo2() { |
| 58 | entry: |
| 59 | br label %header |
| 60 | |
| 61 | header: |
| 62 | %x = add i32 0, 1 |
| 63 | br i1 undef, label %latch, label %loopexit1 |
| 64 | |
| 65 | latch: |
| 66 | br i1 undef, label %header, label %loopexit2 |
| 67 | |
| 68 | ; CHECK: loopexit1: |
| 69 | ; CHECK: %x.lcssa = phi i32 [ %x, %header ] |
| 70 | loopexit1: |
| 71 | br label %loop_with_insert_point |
| 72 | |
| 73 | ; CHECK: loopexit2: |
| 74 | ; CHECK: %x.lcssa1 = phi i32 [ %x, %latch ] |
| 75 | loopexit2: |
| 76 | br label %loop_with_insert_point |
| 77 | |
| 78 | ; CHECK: loop_with_insert_point: |
| 79 | ; CHECK: %x2 = phi i32 [ %x2, %loop_with_insert_point ], [ %x.lcssa1, %loopexit2 ], [ %x.lcssa, %loopexit1 ] |
| 80 | loop_with_insert_point: |
| 81 | br i1 undef, label %loop_with_insert_point, label %exit |
| 82 | |
| 83 | ; CHECK: exit: |
| 84 | ; CHECK: %x2.lcssa = phi i32 [ %x2, %loop_with_insert_point ] |
| 85 | exit: |
| 86 | ret i32 %x |
| 87 | } |