1 ; RUN: opt -objc-arc-contract -S < %s | FileCheck %s 2 3 target datalayout = "e-p:64:64:64" 4 5 declare i8* @objc_retain(i8*) 6 declare void @objc_release(i8*) 7 declare 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: } 16 define void @test0(i8* %p) { 17 entry: 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: } 35 define void @test1(i8* %p) { 36 entry: 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: } 54 define void @test2(i8* %p) { 55 entry: 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: } 75 define void @test3(i8* %newValue) { 76 entry: 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: } 96 define i1 @test4(i8* %newValue, i8* %foo) { 97 entry: 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: } 112 define i1 @test5(i8* %newValue, i8* %foo) { 113 entry: 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: } 128 define i1 @test6(i8* %newValue, i8* %foo) { 129 entry: 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: } 147 define void @test7(i8* %p) { 148 entry: 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: } 164 define void @test8(i8* %p) { 165 entry: 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 180 define i1 @test9(i8* %newValue, i8* %foo, i8* %unrelated_ptr) { 181 entry: 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 195 define i1 @test10(i8* %newValue, i8* %foo, i8* %unrelated_ptr) { 196 entry: 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 210 define i1 @test11(i8* %newValue, i8* %foo, i8* %unrelated_ptr) { 211 entry: 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 ; Make sure that we form the store strong even if there are bitcasts on 221 ; the pointers. 222 ; CHECK-LABEL: define void @test12( 223 ; CHECK: entry: 224 ; CHECK-NEXT: %p16 = bitcast i8** @x to i16** 225 ; CHECK-NEXT: %tmp16 = load i16*, i16** %p16, align 8 226 ; CHECK-NEXT: %tmp8 = bitcast i16* %tmp16 to i8* 227 ; CHECK-NEXT: %p32 = bitcast i8** @x to i32** 228 ; CHECK-NEXT: %v32 = bitcast i8* %p to i32* 229 ; CHECK-NEXT: %0 = bitcast i16** %p16 to i8** 230 ; CHECK-NEXT: tail call void @objc_storeStrong(i8** %0, i8* %p) 231 ; CHECK-NEXT: ret void 232 ; CHECK-NEXT: } 233 define void @test12(i8* %p) { 234 entry: 235 %retain = tail call i8* @objc_retain(i8* %p) nounwind 236 %p16 = bitcast i8** @x to i16** 237 %tmp16 = load i16*, i16** %p16, align 8 238 %tmp8 = bitcast i16* %tmp16 to i8* 239 %p32 = bitcast i8** @x to i32** 240 %v32 = bitcast i8* %retain to i32* 241 store i32* %v32, i32** %p32, align 8 242 tail call void @objc_release(i8* %tmp8) nounwind 243 ret void 244 } 245 246 !0 = !{} 247 248 ; CHECK: attributes [[NUW]] = { nounwind } 249
