1; RUN: opt -objc-arc-contract -S < %s | FileCheck %s 2 3target datalayout = "e-p:64:64:64" 4 5declare i8* @objc_retain(i8*) 6declare void @objc_release(i8*) 7declare void @use_pointer(i8*) 8 9@x = external global i8* 10 11; CHECK-LABEL: define void @test0( 12; CHECK: entry: 13; CHECK-NEXT: tail call void @objc_storeStrong(i8** @x, i8* %p) [[NUW:#[0-9]+]] 14; CHECK-NEXT: ret void 15; CHECK-NEXT: } 16define void @test0(i8* %p) { 17entry: 18 %0 = tail call i8* @objc_retain(i8* %p) nounwind 19 %tmp = load i8*, i8** @x, align 8 20 store i8* %0, i8** @x, align 8 21 tail call void @objc_release(i8* %tmp) nounwind 22 ret void 23} 24 25; Don't do this if the load is volatile. 26 27; CHECK-LABEL: define void @test1(i8* %p) { 28; CHECK-NEXT: entry: 29; CHECK-NEXT: %0 = tail call i8* @objc_retain(i8* %p) [[NUW]] 30; CHECK-NEXT: %tmp = load volatile i8*, i8** @x, align 8 31; CHECK-NEXT: store i8* %0, i8** @x, align 8 32; CHECK-NEXT: tail call void @objc_release(i8* %tmp) [[NUW]] 33; CHECK-NEXT: ret void 34; CHECK-NEXT: } 35define void @test1(i8* %p) { 36entry: 37 %0 = tail call i8* @objc_retain(i8* %p) nounwind 38 %tmp = load volatile i8*, i8** @x, align 8 39 store i8* %0, i8** @x, align 8 40 tail call void @objc_release(i8* %tmp) nounwind 41 ret void 42} 43 44; Don't do this if the store is volatile. 45 46; CHECK-LABEL: define void @test2(i8* %p) { 47; CHECK-NEXT: entry: 48; CHECK-NEXT: %0 = tail call i8* @objc_retain(i8* %p) [[NUW]] 49; CHECK-NEXT: %tmp = load i8*, i8** @x, align 8 50; CHECK-NEXT: store volatile i8* %0, i8** @x, align 8 51; CHECK-NEXT: tail call void @objc_release(i8* %tmp) [[NUW]] 52; CHECK-NEXT: ret void 53; CHECK-NEXT: } 54define void @test2(i8* %p) { 55entry: 56 %0 = tail call i8* @objc_retain(i8* %p) nounwind 57 %tmp = load i8*, i8** @x, align 8 58 store volatile i8* %0, i8** @x, align 8 59 tail call void @objc_release(i8* %tmp) nounwind 60 ret void 61} 62 63; Don't do this if there's a use of the old pointer value between the store 64; and the release. 65 66; CHECK-LABEL: define void @test3(i8* %newValue) { 67; CHECK-NEXT: entry: 68; CHECK-NEXT: %x0 = tail call i8* @objc_retain(i8* %newValue) [[NUW]] 69; CHECK-NEXT: %x1 = load i8*, i8** @x, align 8 70; CHECK-NEXT: store i8* %x0, i8** @x, align 8 71; CHECK-NEXT: tail call void @use_pointer(i8* %x1), !clang.arc.no_objc_arc_exceptions !0 72; CHECK-NEXT: tail call void @objc_release(i8* %x1) [[NUW]], !clang.imprecise_release !0 73; CHECK-NEXT: ret void 74; CHECK-NEXT: } 75define void @test3(i8* %newValue) { 76entry: 77 %x0 = tail call i8* @objc_retain(i8* %newValue) nounwind 78 %x1 = load i8*, i8** @x, align 8 79 store i8* %newValue, i8** @x, align 8 80 tail call void @use_pointer(i8* %x1), !clang.arc.no_objc_arc_exceptions !0 81 tail call void @objc_release(i8* %x1) nounwind, !clang.imprecise_release !0 82 ret void 83} 84 85; Like test3, but with an icmp use instead of a call, for good measure. 86 87; CHECK-LABEL: define i1 @test4(i8* %newValue, i8* %foo) { 88; CHECK-NEXT: entry: 89; CHECK-NEXT: %x0 = tail call i8* @objc_retain(i8* %newValue) [[NUW]] 90; CHECK-NEXT: %x1 = load i8*, i8** @x, align 8 91; CHECK-NEXT: store i8* %x0, i8** @x, align 8 92; CHECK-NEXT: %t = icmp eq i8* %x1, %foo 93; CHECK-NEXT: tail call void @objc_release(i8* %x1) [[NUW]], !clang.imprecise_release !0 94; CHECK-NEXT: ret i1 %t 95; CHECK-NEXT: } 96define i1 @test4(i8* %newValue, i8* %foo) { 97entry: 98 %x0 = tail call i8* @objc_retain(i8* %newValue) nounwind 99 %x1 = load i8*, i8** @x, align 8 100 store i8* %newValue, i8** @x, align 8 101 %t = icmp eq i8* %x1, %foo 102 tail call void @objc_release(i8* %x1) nounwind, !clang.imprecise_release !0 103 ret i1 %t 104} 105 106; Do form an objc_storeStrong here, because the use is before the store. 107 108; CHECK-LABEL: define i1 @test5(i8* %newValue, i8* %foo) { 109; CHECK: %t = icmp eq i8* %x1, %foo 110; CHECK: tail call void @objc_storeStrong(i8** @x, i8* %newValue) [[NUW]] 111; CHECK: } 112define i1 @test5(i8* %newValue, i8* %foo) { 113entry: 114 %x0 = tail call i8* @objc_retain(i8* %newValue) nounwind 115 %x1 = load i8*, i8** @x, align 8 116 %t = icmp eq i8* %x1, %foo 117 store i8* %newValue, i8** @x, align 8 118 tail call void @objc_release(i8* %x1) nounwind, !clang.imprecise_release !0 119 ret i1 %t 120} 121 122; Like test5, but the release is before the store. 123 124; CHECK-LABEL: define i1 @test6(i8* %newValue, i8* %foo) { 125; CHECK: %t = icmp eq i8* %x1, %foo 126; CHECK: tail call void @objc_storeStrong(i8** @x, i8* %newValue) [[NUW]] 127; CHECK: } 128define i1 @test6(i8* %newValue, i8* %foo) { 129entry: 130 %x0 = tail call i8* @objc_retain(i8* %newValue) nounwind 131 %x1 = load i8*, i8** @x, align 8 132 tail call void @objc_release(i8* %x1) nounwind, !clang.imprecise_release !0 133 %t = icmp eq i8* %x1, %foo 134 store i8* %newValue, i8** @x, align 8 135 ret i1 %t 136} 137 138; Like test0, but there's no store, so don't form an objc_storeStrong. 139 140; CHECK-LABEL: define void @test7( 141; CHECK-NEXT: entry: 142; CHECK-NEXT: %0 = tail call i8* @objc_retain(i8* %p) [[NUW]] 143; CHECK-NEXT: %tmp = load i8*, i8** @x, align 8 144; CHECK-NEXT: tail call void @objc_release(i8* %tmp) [[NUW]] 145; CHECK-NEXT: ret void 146; CHECK-NEXT: } 147define void @test7(i8* %p) { 148entry: 149 %0 = tail call i8* @objc_retain(i8* %p) nounwind 150 %tmp = load i8*, i8** @x, align 8 151 tail call void @objc_release(i8* %tmp) nounwind 152 ret void 153} 154 155; Like test0, but there's no retain, so don't form an objc_storeStrong. 156 157; CHECK-LABEL: define void @test8( 158; CHECK-NEXT: entry: 159; CHECK-NEXT: %tmp = load i8*, i8** @x, align 8 160; CHECK-NEXT: store i8* %p, i8** @x, align 8 161; CHECK-NEXT: tail call void @objc_release(i8* %tmp) [[NUW]] 162; CHECK-NEXT: ret void 163; CHECK-NEXT: } 164define void @test8(i8* %p) { 165entry: 166 %tmp = load i8*, i8** @x, align 8 167 store i8* %p, i8** @x, align 8 168 tail call void @objc_release(i8* %tmp) nounwind 169 ret void 170} 171 172; Make sure that we properly handle release that *may* release our new 173; value in between the retain and the store. We need to be sure that 174; this we can safely move the retain to the store. This specific test 175; makes sure that we properly handled a release of an unrelated 176; pointer. 177; 178; CHECK-LABEL: define i1 @test9(i8* %newValue, i8* %foo, i8* %unrelated_ptr) { 179; CHECK-NOT: objc_storeStrong 180define i1 @test9(i8* %newValue, i8* %foo, i8* %unrelated_ptr) { 181entry: 182 %x0 = tail call i8* @objc_retain(i8* %newValue) nounwind 183 tail call void @objc_release(i8* %unrelated_ptr) nounwind, !clang.imprecise_release !0 184 %x1 = load i8*, i8** @x, align 8 185 tail call void @objc_release(i8* %x1) nounwind, !clang.imprecise_release !0 186 %t = icmp eq i8* %x1, %foo 187 store i8* %newValue, i8** @x, align 8 188 ret i1 %t 189} 190 191; Make sure that we don't perform the optimization when we just have a call. 192; 193; CHECK-LABEL: define i1 @test10(i8* %newValue, i8* %foo, i8* %unrelated_ptr) { 194; CHECK-NOT: objc_storeStrong 195define i1 @test10(i8* %newValue, i8* %foo, i8* %unrelated_ptr) { 196entry: 197 %x0 = tail call i8* @objc_retain(i8* %newValue) nounwind 198 call void @use_pointer(i8* %unrelated_ptr) 199 %x1 = load i8*, i8** @x, align 8 200 tail call void @objc_release(i8* %x1) nounwind, !clang.imprecise_release !0 201 %t = icmp eq i8* %x1, %foo 202 store i8* %newValue, i8** @x, align 8 203 ret i1 %t 204} 205 206; Make sure we form the store strong if the use in between the retain 207; and the store does not touch reference counts. 208; CHECK-LABEL: define i1 @test11(i8* %newValue, i8* %foo, i8* %unrelated_ptr) { 209; CHECK: objc_storeStrong 210define i1 @test11(i8* %newValue, i8* %foo, i8* %unrelated_ptr) { 211entry: 212 %x0 = tail call i8* @objc_retain(i8* %newValue) nounwind 213 %t = icmp eq i8* %newValue, %foo 214 %x1 = load i8*, i8** @x, align 8 215 tail call void @objc_release(i8* %x1) nounwind, !clang.imprecise_release !0 216 store i8* %newValue, i8** @x, align 8 217 ret i1 %t 218} 219 220!0 = !{} 221 222; CHECK: attributes [[NUW]] = { nounwind } 223