| Max Kazantsev | 7094c8d | 2018-03-27 07:30:38 +0000 | [diff] [blame] | 1 | ; RUN: opt < %s -scalar-evolution -analyze | FileCheck %s |
| 2 | |
| 3 | ; One side exit dominating the latch, exact backedge taken count is known. |
| 4 | define void @test_01() { |
| 5 | |
| 6 | ; CHECK-LABEL: Determining loop execution counts for: @test_01 |
| 7 | ; CHECK-NEXT: Loop %loop: <multiple exits> backedge-taken count is 50 |
| 8 | |
| 9 | entry: |
| 10 | br label %loop |
| 11 | |
| 12 | loop: |
| 13 | %iv = phi i32 [ 0, %entry ], [ %iv.next, %backedge ] |
| 14 | %side.cond = icmp slt i32 %iv, 50 |
| 15 | br i1 %side.cond, label %backedge, label %side.exit |
| 16 | |
| 17 | backedge: |
| 18 | %iv.next = add i32 %iv, 1 |
| 19 | %loop.cond = icmp slt i32 %iv, 100 |
| 20 | br i1 %loop.cond, label %loop, label %exit |
| 21 | |
| 22 | exit: |
| 23 | ret void |
| 24 | |
| 25 | side.exit: |
| 26 | ret void |
| 27 | } |
| Max Kazantsev | 58fce7e | 2018-05-03 02:37:55 +0000 | [diff] [blame] | 28 | |
| 29 | define void @test_02(i1 %c) { |
| 30 | |
| 31 | ; CHECK-LABEL: Determining loop execution counts for: @test_02 |
| 32 | ; CHECK-NEXT: Loop %loop: <multiple exits> backedge-taken count is 50 |
| 33 | |
| 34 | entry: |
| 35 | br label %loop |
| 36 | |
| 37 | loop: |
| 38 | %iv = phi i32 [ 0, %entry ], [ %iv.next, %backedge ] |
| 39 | br i1 %c, label %if.true, label %if.false |
| 40 | |
| 41 | if.true: |
| 42 | br label %merge |
| 43 | |
| 44 | if.false: |
| 45 | br label %merge |
| 46 | |
| 47 | merge: |
| 48 | %side.cond = icmp slt i32 %iv, 50 |
| 49 | br i1 %side.cond, label %backedge, label %side.exit |
| 50 | |
| 51 | backedge: |
| 52 | %iv.next = add i32 %iv, 1 |
| 53 | %loop.cond = icmp slt i32 %iv, 100 |
| 54 | br i1 %loop.cond, label %loop, label %exit |
| 55 | |
| 56 | exit: |
| 57 | ret void |
| 58 | |
| 59 | side.exit: |
| 60 | ret void |
| 61 | } |