| Dan Gohman | 3e054fe | 2009-09-08 22:34:10 +0000 | [diff] [blame] | 1 | ; RUN: opt < %s -loop-reduce -S | grep phi | count 1 |
| Dan Gohman | cbfe5bb | 2008-06-22 20:44:02 +0000 | [diff] [blame] | 2 | |
| 3 | define void @foo(i32 %n) { |
| 4 | entry: |
| 5 | br label %loop |
| 6 | |
| 7 | loop: |
| 8 | %i = phi i32 [ 0, %entry ], [ %i.next, %loop ] |
| 9 | |
| 10 | ; These three instructions form an isolated cycle and can be deleted. |
| 11 | %j = phi i32 [ 0, %entry ], [ %j.y, %loop ] |
| 12 | %j.x = add i32 %j, 1 |
| 13 | %j.y = mul i32 %j.x, 2 |
| 14 | |
| 15 | %i.next = add i32 %i, 1 |
| 16 | %c = icmp ne i32 %i.next, %n |
| 17 | br i1 %c, label %loop, label %exit |
| 18 | |
| 19 | exit: |
| 20 | ret void |
| 21 | } |