1*9880d681SAndroid Build Coastguard Worker; RUN: llc -O1 < %s -mtriple=armv7 -mattr=+db | FileCheck %s 2*9880d681SAndroid Build Coastguard Worker 3*9880d681SAndroid Build Coastguard Worker@x1 = global i32 0, align 4 4*9880d681SAndroid Build Coastguard Worker@x2 = global i32 0, align 4 5*9880d681SAndroid Build Coastguard Worker 6*9880d681SAndroid Build Coastguard Workerdefine void @test() { 7*9880d681SAndroid Build Coastguard Workerentry: 8*9880d681SAndroid Build Coastguard Worker br label %for.body 9*9880d681SAndroid Build Coastguard Worker 10*9880d681SAndroid Build Coastguard Workerfor.body: ; preds = %for.body, %entry 11*9880d681SAndroid Build Coastguard Worker %i.013 = phi i32 [ 1, %entry ], [ %inc6, %for.body ] 12*9880d681SAndroid Build Coastguard Worker store atomic i32 %i.013, i32* @x1 seq_cst, align 4 13*9880d681SAndroid Build Coastguard Worker store atomic i32 %i.013, i32* @x1 seq_cst, align 4 14*9880d681SAndroid Build Coastguard Worker store atomic i32 %i.013, i32* @x2 seq_cst, align 4 15*9880d681SAndroid Build Coastguard Worker %inc6 = add nsw i32 %i.013, 1 16*9880d681SAndroid Build Coastguard Worker %exitcond = icmp eq i32 %inc6, 2 17*9880d681SAndroid Build Coastguard Worker br i1 %exitcond, label %for.end, label %for.body 18*9880d681SAndroid Build Coastguard Worker 19*9880d681SAndroid Build Coastguard Workerfor.end: ; preds = %for.body 20*9880d681SAndroid Build Coastguard Worker ret void 21*9880d681SAndroid Build Coastguard Worker 22*9880d681SAndroid Build Coastguard Worker; The for.body contains 3 seq_cst stores. 23*9880d681SAndroid Build Coastguard Worker; Hence it should have 3 dmb;str;dmb sequences with the middle dmbs collapsed 24*9880d681SAndroid Build Coastguard Worker; CHECK: %for.body 25*9880d681SAndroid Build Coastguard Worker; CHECK-NOT: str 26*9880d681SAndroid Build Coastguard Worker; CHECK: dmb 27*9880d681SAndroid Build Coastguard Worker; CHECK-NOT: dmb 28*9880d681SAndroid Build Coastguard Worker; CHECK: str 29*9880d681SAndroid Build Coastguard Worker 30*9880d681SAndroid Build Coastguard Worker; CHECK-NOT: str 31*9880d681SAndroid Build Coastguard Worker; CHECK: dmb 32*9880d681SAndroid Build Coastguard Worker; CHECK-NOT: dmb 33*9880d681SAndroid Build Coastguard Worker; CHECK: str 34*9880d681SAndroid Build Coastguard Worker 35*9880d681SAndroid Build Coastguard Worker; CHECK-NOT: str 36*9880d681SAndroid Build Coastguard Worker; CHECK: dmb 37*9880d681SAndroid Build Coastguard Worker; CHECK-NOT: dmb 38*9880d681SAndroid Build Coastguard Worker; CHECK: str 39*9880d681SAndroid Build Coastguard Worker 40*9880d681SAndroid Build Coastguard Worker; CHECK-NOT: str 41*9880d681SAndroid Build Coastguard Worker; CHECK: dmb 42*9880d681SAndroid Build Coastguard Worker; CHECK-NOT: dmb 43*9880d681SAndroid Build Coastguard Worker; CHECK-NOT: str 44*9880d681SAndroid Build Coastguard Worker; CHECK: %for.end 45*9880d681SAndroid Build Coastguard Worker} 46*9880d681SAndroid Build Coastguard Worker 47*9880d681SAndroid Build Coastguard Workerdefine void @test2() { 48*9880d681SAndroid Build Coastguard Worker call void @llvm.arm.dmb(i32 11) 49*9880d681SAndroid Build Coastguard Worker tail call void @test() 50*9880d681SAndroid Build Coastguard Worker call void @llvm.arm.dmb(i32 11) 51*9880d681SAndroid Build Coastguard Worker ret void 52*9880d681SAndroid Build Coastguard Worker; the call should prevent the two dmbs from collapsing 53*9880d681SAndroid Build Coastguard Worker; CHECK: test2: 54*9880d681SAndroid Build Coastguard Worker; CHECK: dmb 55*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT: bl 56*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT: dmb 57*9880d681SAndroid Build Coastguard Worker} 58*9880d681SAndroid Build Coastguard Worker 59*9880d681SAndroid Build Coastguard Workerdefine void @test3() { 60*9880d681SAndroid Build Coastguard Worker call void @llvm.arm.dmb(i32 11) 61*9880d681SAndroid Build Coastguard Worker call void @llvm.arm.dsb(i32 9) 62*9880d681SAndroid Build Coastguard Worker call void @llvm.arm.dmb(i32 11) 63*9880d681SAndroid Build Coastguard Worker ret void 64*9880d681SAndroid Build Coastguard Worker; the call should prevent the two dmbs from collapsing 65*9880d681SAndroid Build Coastguard Worker; CHECK: test3: 66*9880d681SAndroid Build Coastguard Worker; CHECK: dmb 67*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT: dsb 68*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT: dmb 69*9880d681SAndroid Build Coastguard Worker 70*9880d681SAndroid Build Coastguard Worker} 71*9880d681SAndroid Build Coastguard Worker 72*9880d681SAndroid Build Coastguard Worker 73*9880d681SAndroid Build Coastguard Workerdeclare void @llvm.arm.dmb(i32) 74*9880d681SAndroid Build Coastguard Workerdeclare void @llvm.arm.dsb(i32) 75