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** @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: 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** @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** @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: 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** @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** @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: 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** @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** @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: 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** @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** @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: 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** @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: 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** @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** @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** @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** @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** @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 !0 = metadata !{} 173 174 ; CHECK: attributes [[NUW]] = { nounwind } 175
