| Dan Gohman | c1be92f | 2010-10-18 18:04:47 +0000 | [diff] [blame] | 1 | ; RUN: opt < %s -basicaa -sink -S | FileCheck %s |
| Dan Gohman | 28a193e | 2010-05-07 15:40:13 +0000 | [diff] [blame] | 2 | |
| 3 | @A = external global i32 |
| 4 | @B = external global i32 |
| 5 | |
| 6 | ; Sink should sink the load past the store (which doesn't overlap) into |
| 7 | ; the block that uses it. |
| 8 | |
| 9 | ; CHECK: @foo |
| 10 | ; CHECK: true: |
| 11 | ; CHECK-NEXT: %l = load i32* @A |
| 12 | ; CHECK-NEXT: ret i32 %l |
| 13 | |
| 14 | define i32 @foo(i1 %z) { |
| 15 | %l = load i32* @A |
| 16 | store i32 0, i32* @B |
| 17 | br i1 %z, label %true, label %false |
| 18 | true: |
| 19 | ret i32 %l |
| 20 | false: |
| 21 | ret i32 0 |
| 22 | } |
| Eli Friedman | 86b5db8 | 2011-09-01 21:21:24 +0000 | [diff] [blame] | 23 | |
| 24 | ; But don't sink volatile loads... |
| 25 | |
| 26 | ; CHECK: @foo2 |
| Eli Friedman | 770e16f | 2011-09-01 21:25:42 +0000 | [diff] [blame^] | 27 | ; CHECK: load volatile |
| Eli Friedman | 86b5db8 | 2011-09-01 21:21:24 +0000 | [diff] [blame] | 28 | ; CHECK-NEXT: store i32 |
| 29 | |
| 30 | define i32 @foo2(i1 %z) { |
| Eli Friedman | 770e16f | 2011-09-01 21:25:42 +0000 | [diff] [blame^] | 31 | %l = load volatile i32* @A |
| Eli Friedman | 86b5db8 | 2011-09-01 21:21:24 +0000 | [diff] [blame] | 32 | store i32 0, i32* @B |
| 33 | br i1 %z, label %true, label %false |
| 34 | true: |
| 35 | ret i32 %l |
| 36 | false: |
| 37 | ret i32 0 |
| 38 | } |