| Davide Italiano | 141b2891 | 2015-05-20 21:40:38 +0000 | [diff] [blame] | 1 | ; RUN: llc -O1 < %s -mtriple=armv7 -mattr=+db | FileCheck %s |
| Renato Golin | d93295e | 2014-04-02 09:03:43 +0000 | [diff] [blame] | 2 | |
| 3 | @x1 = global i32 0, align 4 |
| 4 | @x2 = global i32 0, align 4 |
| 5 | |
| 6 | define void @test() { |
| 7 | entry: |
| 8 | br label %for.body |
| 9 | |
| 10 | for.body: ; preds = %for.body, %entry |
| 11 | %i.013 = phi i32 [ 1, %entry ], [ %inc6, %for.body ] |
| 12 | store atomic i32 %i.013, i32* @x1 seq_cst, align 4 |
| 13 | store atomic i32 %i.013, i32* @x1 seq_cst, align 4 |
| 14 | store atomic i32 %i.013, i32* @x2 seq_cst, align 4 |
| 15 | %inc6 = add nsw i32 %i.013, 1 |
| 16 | %exitcond = icmp eq i32 %inc6, 2 |
| 17 | br i1 %exitcond, label %for.end, label %for.body |
| 18 | |
| 19 | for.end: ; preds = %for.body |
| 20 | ret void |
| 21 | |
| 22 | ; The for.body contains 3 seq_cst stores. |
| 23 | ; Hence it should have 3 dmb;str;dmb sequences with the middle dmbs collapsed |
| 24 | ; CHECK: %for.body |
| 25 | ; CHECK-NOT: str |
| 26 | ; CHECK: dmb |
| 27 | ; CHECK-NOT: dmb |
| 28 | ; CHECK: str |
| 29 | |
| 30 | ; CHECK-NOT: str |
| 31 | ; CHECK: dmb |
| 32 | ; CHECK-NOT: dmb |
| 33 | ; CHECK: str |
| 34 | |
| 35 | ; CHECK-NOT: str |
| 36 | ; CHECK: dmb |
| 37 | ; CHECK-NOT: dmb |
| 38 | ; CHECK: str |
| 39 | |
| 40 | ; CHECK-NOT: str |
| 41 | ; CHECK: dmb |
| 42 | ; CHECK-NOT: dmb |
| 43 | ; CHECK-NOT: str |
| 44 | ; CHECK: %for.end |
| 45 | } |
| 46 | |
| 47 | define void @test2() { |
| 48 | call void @llvm.arm.dmb(i32 11) |
| 49 | tail call void @test() |
| 50 | call void @llvm.arm.dmb(i32 11) |
| 51 | ret void |
| 52 | ; the call should prevent the two dmbs from collapsing |
| 53 | ; CHECK: test2: |
| 54 | ; CHECK: dmb |
| 55 | ; CHECK-NEXT: bl |
| 56 | ; CHECK-NEXT: dmb |
| 57 | } |
| 58 | |
| 59 | define void @test3() { |
| 60 | call void @llvm.arm.dmb(i32 11) |
| 61 | call void @llvm.arm.dsb(i32 9) |
| 62 | call void @llvm.arm.dmb(i32 11) |
| 63 | ret void |
| 64 | ; the call should prevent the two dmbs from collapsing |
| 65 | ; CHECK: test3: |
| 66 | ; CHECK: dmb |
| 67 | ; CHECK-NEXT: dsb |
| 68 | ; CHECK-NEXT: dmb |
| 69 | |
| 70 | } |
| 71 | |
| 72 | |
| 73 | declare void @llvm.arm.dmb(i32) |
| 74 | declare void @llvm.arm.dsb(i32) |