| Dan Gohman | 00cb5b7 | 2010-02-19 18:12:07 +0000 | [diff] [blame] | 1 | ; RUN: opt < %s -analyze -scalar-evolution | FileCheck %s |
| 2 | |
| 3 | ; Trip counts with trivial exit conditions. |
| 4 | |
| 5 | ; CHECK: Determining loop execution counts for: @a |
| 6 | ; CHECK: Loop %loop: Unpredictable backedge-taken count. |
| 7 | ; CHECK: Loop %loop: Unpredictable max backedge-taken count. |
| 8 | |
| 9 | ; CHECK: Determining loop execution counts for: @b |
| 10 | ; CHECK: Loop %loop: backedge-taken count is false |
| 11 | ; CHECK: Loop %loop: max backedge-taken count is false |
| 12 | |
| 13 | ; CHECK: Determining loop execution counts for: @c |
| 14 | ; CHECK: Loop %loop: backedge-taken count is false |
| 15 | ; CHECK: Loop %loop: max backedge-taken count is false |
| 16 | |
| 17 | ; CHECK: Determining loop execution counts for: @d |
| 18 | ; CHECK: Loop %loop: Unpredictable backedge-taken count. |
| 19 | ; CHECK: Loop %loop: Unpredictable max backedge-taken count. |
| 20 | |
| 21 | define void @a(i64 %n) nounwind { |
| 22 | entry: |
| 23 | %t0 = icmp sgt i64 %n, 0 |
| 24 | br i1 %t0, label %loop, label %return |
| 25 | |
| 26 | loop: |
| 27 | %i = phi i64 [ %i.next, %loop ], [ 0, %entry ] |
| 28 | %i.next = add nsw i64 %i, 1 |
| 29 | %exitcond = icmp eq i64 %i.next, %n |
| 30 | br i1 false, label %return, label %loop |
| 31 | |
| 32 | return: |
| 33 | ret void |
| 34 | } |
| 35 | define void @b(i64 %n) nounwind { |
| 36 | entry: |
| 37 | %t0 = icmp sgt i64 %n, 0 |
| 38 | br i1 %t0, label %loop, label %return |
| 39 | |
| 40 | loop: |
| 41 | %i = phi i64 [ %i.next, %loop ], [ 0, %entry ] |
| 42 | %i.next = add nsw i64 %i, 1 |
| 43 | %exitcond = icmp eq i64 %i.next, %n |
| 44 | br i1 true, label %return, label %loop |
| 45 | |
| 46 | return: |
| 47 | ret void |
| 48 | } |
| 49 | define void @c(i64 %n) nounwind { |
| 50 | entry: |
| 51 | %t0 = icmp sgt i64 %n, 0 |
| 52 | br i1 %t0, label %loop, label %return |
| 53 | |
| 54 | loop: |
| 55 | %i = phi i64 [ %i.next, %loop ], [ 0, %entry ] |
| 56 | %i.next = add nsw i64 %i, 1 |
| 57 | %exitcond = icmp eq i64 %i.next, %n |
| 58 | br i1 false, label %loop, label %return |
| 59 | |
| 60 | return: |
| 61 | ret void |
| 62 | } |
| 63 | define void @d(i64 %n) nounwind { |
| 64 | entry: |
| 65 | %t0 = icmp sgt i64 %n, 0 |
| 66 | br i1 %t0, label %loop, label %return |
| 67 | |
| 68 | loop: |
| 69 | %i = phi i64 [ %i.next, %loop ], [ 0, %entry ] |
| 70 | %i.next = add nsw i64 %i, 1 |
| 71 | %exitcond = icmp eq i64 %i.next, %n |
| 72 | br i1 true, label %loop, label %return |
| 73 | |
| 74 | return: |
| 75 | ret void |
| 76 | } |