1; RUN: llc -mtriple=aarch64-apple-ios7.0 -o - %s | FileCheck %s 2 3define i32 @test_return(i32* %p, i32 %oldval, i32 %newval) { 4; CHECK-LABEL: test_return: 5 6; CHECK: [[LOOP:LBB[0-9]+_[0-9]+]]: 7; CHECK: ldaxr [[LOADED:w[0-9]+]], [x0] 8; CHECK: cmp [[LOADED]], w1 9; CHECK: b.ne [[FAILED:LBB[0-9]+_[0-9]+]] 10 11; CHECK: stlxr [[STATUS:w[0-9]+]], {{w[0-9]+}}, [x0] 12; CHECK: cbnz [[STATUS]], [[LOOP]] 13 14; CHECK-NOT: cmp {{w[0-9]+}}, {{w[0-9]+}} 15; CHECK: orr w0, wzr, #0x1 16; CHECK: ret 17 18; CHECK: [[FAILED]]: 19; CHECK-NOT: cmp {{w[0-9]+}}, {{w[0-9]+}} 20; CHECK: mov w0, wzr 21; CHECK: ret 22 23 %pair = cmpxchg i32* %p, i32 %oldval, i32 %newval seq_cst seq_cst 24 %success = extractvalue { i32, i1 } %pair, 1 25 %conv = zext i1 %success to i32 26 ret i32 %conv 27} 28 29define i1 @test_return_bool(i8* %value, i8 %oldValue, i8 %newValue) { 30; CHECK-LABEL: test_return_bool: 31 32; CHECK: [[LOOP:LBB[0-9]+_[0-9]+]]: 33; CHECK: ldaxrb [[LOADED:w[0-9]+]], [x0] 34; CHECK: cmp [[LOADED]], w1, uxtb 35; CHECK: b.ne [[FAILED:LBB[0-9]+_[0-9]+]] 36 37; CHECK: stlxrb [[STATUS:w[0-9]+]], {{w[0-9]+}}, [x0] 38; CHECK: cbnz [[STATUS]], [[LOOP]] 39 40; CHECK-NOT: cmp {{w[0-9]+}}, {{w[0-9]+}} 41 ; FIXME: DAG combine should be able to deal with this. 42; CHECK: orr [[TMP:w[0-9]+]], wzr, #0x1 43; CHECK: eor w0, [[TMP]], #0x1 44; CHECK: ret 45 46; CHECK: [[FAILED]]: 47; CHECK-NOT: cmp {{w[0-9]+}}, {{w[0-9]+}} 48; CHECK: mov [[TMP:w[0-9]+]], wzr 49; CHECK: eor w0, [[TMP]], #0x1 50; CHECK: ret 51 52 %pair = cmpxchg i8* %value, i8 %oldValue, i8 %newValue acq_rel monotonic 53 %success = extractvalue { i8, i1 } %pair, 1 54 %failure = xor i1 %success, 1 55 ret i1 %failure 56} 57 58define void @test_conditional(i32* %p, i32 %oldval, i32 %newval) { 59; CHECK-LABEL: test_conditional: 60 61; CHECK: [[LOOP:LBB[0-9]+_[0-9]+]]: 62; CHECK: ldaxr [[LOADED:w[0-9]+]], [x0] 63; CHECK: cmp [[LOADED]], w1 64; CHECK: b.ne [[FAILED:LBB[0-9]+_[0-9]+]] 65 66; CHECK: stlxr [[STATUS:w[0-9]+]], w2, [x0] 67; CHECK: cbnz [[STATUS]], [[LOOP]] 68 69; CHECK-NOT: cmp {{w[0-9]+}}, {{w[0-9]+}} 70; CHECK: b _bar 71 72; CHECK: [[FAILED]]: 73; CHECK-NOT: cmp {{w[0-9]+}}, {{w[0-9]+}} 74; CHECK: b _baz 75 76 %pair = cmpxchg i32* %p, i32 %oldval, i32 %newval seq_cst seq_cst 77 %success = extractvalue { i32, i1 } %pair, 1 78 br i1 %success, label %true, label %false 79 80true: 81 tail call void @bar() #2 82 br label %end 83 84false: 85 tail call void @baz() #2 86 br label %end 87 88end: 89 ret void 90} 91 92declare void @bar() 93declare void @baz() 94