1; RUN: llc -mtriple=thumbv7s-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: ldrex [[LOADED:r[0-9]+]], [r0] 7; CHECK: cmp [[LOADED]], r1 8; CHECK: bne [[FAILED:LBB[0-9]+_[0-9]+]] 9 10; CHECK: dmb ishst 11 12; CHECK: [[LOOP:LBB[0-9]+_[0-9]+]]: 13; CHECK: strex [[STATUS:r[0-9]+]], {{r[0-9]+}}, [r0] 14; CHECK: cbz [[STATUS]], [[SUCCESS:LBB[0-9]+_[0-9]+]] 15 16; CHECK: ldrex [[LOADED]], [r0] 17; CHECK: cmp [[LOADED]], r1 18; CHECK: beq [[LOOP]] 19 20; CHECK: [[FAILED]]: 21; CHECK-NOT: cmp {{r[0-9]+}}, {{r[0-9]+}} 22; CHECK: clrex 23; CHECK: dmb ish 24; CHECK: movs r0, #0 25; CHECK: bx lr 26 27; CHECK: [[SUCCESS]]: 28; CHECK-NOT: cmp {{r[0-9]+}}, {{r[0-9]+}} 29; CHECK: dmb ish 30; CHECK: movs r0, #1 31; CHECK: bx lr 32 33 %pair = cmpxchg i32* %p, i32 %oldval, i32 %newval seq_cst seq_cst 34 %success = extractvalue { i32, i1 } %pair, 1 35 %conv = zext i1 %success to i32 36 ret i32 %conv 37} 38 39define i1 @test_return_bool(i8* %value, i8 %oldValue, i8 %newValue) { 40; CHECK-LABEL: test_return_bool: 41 42; CHECK: uxtb [[OLDBYTE:r[0-9]+]], r1 43 44; CHECK: ldrexb [[LOADED:r[0-9]+]], [r0] 45; CHECK: cmp [[LOADED]], [[OLDBYTE]] 46; CHECK: bne [[FAIL:LBB[0-9]+_[0-9]+]] 47 48; CHECK: dmb ishst 49 50; CHECK: [[LOOP:LBB[0-9]+_[0-9]+]]: 51; CHECK: strexb [[STATUS:r[0-9]+]], {{r[0-9]+}}, [r0] 52; CHECK: cbz [[STATUS]], [[SUCCESS:LBB[0-9]+_[0-9]+]] 53 54; CHECK: ldrexb [[LOADED]], [r0] 55; CHECK: cmp [[LOADED]], [[OLDBYTE]] 56; CHECK: beq [[LOOP]] 57 58 59 ; FIXME: this eor is redundant. Need to teach DAG combine that. 60; CHECK: [[FAIL]]: 61; CHECK: clrex 62; CHECK: movs [[TMP:r[0-9]+]], #0 63; CHECK: eor r0, [[TMP]], #1 64; CHECK: bx lr 65 66; CHECK: [[SUCCESS]]: 67; CHECK-NOT: cmp {{r[0-9]+}}, {{r[0-9]+}} 68; CHECK: movs [[TMP:r[0-9]+]], #1 69; CHECK: eor r0, [[TMP]], #1 70; CHECK: bx lr 71 72 73 %pair = cmpxchg i8* %value, i8 %oldValue, i8 %newValue acq_rel monotonic 74 %success = extractvalue { i8, i1 } %pair, 1 75 %failure = xor i1 %success, 1 76 ret i1 %failure 77} 78 79define void @test_conditional(i32* %p, i32 %oldval, i32 %newval) { 80; CHECK-LABEL: test_conditional: 81 82; CHECK: ldrex [[LOADED:r[0-9]+]], [r0] 83; CHECK: cmp [[LOADED]], r1 84; CHECK: bne [[FAILED:LBB[0-9]+_[0-9]+]] 85 86; CHECK: dmb ishst 87 88; CHECK: [[LOOP:LBB[0-9]+_[0-9]+]]: 89; CHECK: strex [[STATUS:r[0-9]+]], r2, [r0] 90; CHECK: cbz [[STATUS]], [[SUCCESS:LBB[0-9]+_[0-9]+]] 91 92; CHECK: ldrex [[LOADED]], [r0] 93; CHECK: cmp [[LOADED]], r1 94; CHECK: beq [[LOOP]] 95 96; CHECK: [[FAILED]]: 97; CHECK-NOT: cmp {{r[0-9]+}}, {{r[0-9]+}} 98; CHECK: clrex 99; CHECK: dmb ish 100; CHECK: b.w _baz 101 102; CHECK: [[SUCCESS]]: 103; CHECK-NOT: cmp {{r[0-9]+}}, {{r[0-9]+}} 104; CHECK: dmb ish 105; CHECK: b.w _bar 106 107 %pair = cmpxchg i32* %p, i32 %oldval, i32 %newval seq_cst seq_cst 108 %success = extractvalue { i32, i1 } %pair, 1 109 br i1 %success, label %true, label %false 110 111true: 112 tail call void @bar() #2 113 br label %end 114 115false: 116 tail call void @baz() #2 117 br label %end 118 119end: 120 ret void 121} 122 123declare void @bar() 124declare void @baz() 125