1 ; RUN: opt -basicaa -print-memoryssa -verify-memoryssa -analyze < %s 2>&1 | FileCheck %s 2 ; RUN: opt -aa-pipeline=basic-aa -passes='print<memoryssa>,verify<memoryssa>' -disable-output < %s 2>&1 | FileCheck %s 3 4 ; %ptr can't alias %local, so we should be able to optimize the use of %local to 5 ; point to the store to %local. 6 ; CHECK-LABEL: define void @check 7 define void @check(i8* %ptr, i1 %bool) { 8 entry: 9 %local = alloca i8, align 1 10 ; CHECK: 1 = MemoryDef(liveOnEntry) 11 ; CHECK-NEXT: store i8 0, i8* %local, align 1 12 store i8 0, i8* %local, align 1 13 br i1 %bool, label %if.then, label %if.end 14 15 if.then: 16 %p2 = getelementptr inbounds i8, i8* %ptr, i32 1 17 ; CHECK: 2 = MemoryDef(1) 18 ; CHECK-NEXT: store i8 0, i8* %p2, align 1 19 store i8 0, i8* %p2, align 1 20 br label %if.end 21 22 if.end: 23 ; CHECK: 3 = MemoryPhi({entry,1},{if.then,2}) 24 ; CHECK: MemoryUse(1) 25 ; CHECK-NEXT: load i8, i8* %local, align 1 26 load i8, i8* %local, align 1 27 ret void 28 } 29 30 ; CHECK-LABEL: define void @check2 31 define void @check2(i1 %val1, i1 %val2, i1 %val3) { 32 entry: 33 %local = alloca i8, align 1 34 %local2 = alloca i8, align 1 35 36 ; CHECK: 1 = MemoryDef(liveOnEntry) 37 ; CHECK-NEXT: store i8 0, i8* %local 38 store i8 0, i8* %local 39 br i1 %val1, label %if.then, label %phi.3 40 41 if.then: 42 ; CHECK: 2 = MemoryDef(1) 43 ; CHECK-NEXT: store i8 2, i8* %local2 44 store i8 2, i8* %local2 45 br i1 %val2, label %phi.2, label %phi.3 46 47 phi.3: 48 ; CHECK: 7 = MemoryPhi({entry,1},{if.then,2}) 49 ; CHECK: 3 = MemoryDef(7) 50 ; CHECK-NEXT: store i8 3, i8* %local2 51 store i8 3, i8* %local2 52 br i1 %val3, label %phi.2, label %phi.1 53 54 phi.2: 55 ; CHECK: 5 = MemoryPhi({if.then,2},{phi.3,3}) 56 ; CHECK: 4 = MemoryDef(5) 57 ; CHECK-NEXT: store i8 4, i8* %local2 58 store i8 4, i8* %local2 59 br label %phi.1 60 61 phi.1: 62 ; Order matters here; phi.2 needs to come before phi.3, because that's the order 63 ; they're visited in. 64 ; CHECK: 6 = MemoryPhi({phi.2,4},{phi.3,3}) 65 ; CHECK: MemoryUse(1) 66 ; CHECK-NEXT: load i8, i8* %local 67 load i8, i8* %local 68 ret void 69 } 70 71 ; CHECK-LABEL: define void @cross_phi 72 define void @cross_phi(i8* noalias %p1, i8* noalias %p2) { 73 ; CHECK: 1 = MemoryDef(liveOnEntry) 74 ; CHECK-NEXT: store i8 0, i8* %p1 75 store i8 0, i8* %p1 76 ; CHECK: MemoryUse(1) 77 ; CHECK-NEXT: load i8, i8* %p1 78 load i8, i8* %p1 79 br i1 undef, label %a, label %b 80 81 a: 82 ; CHECK: 2 = MemoryDef(1) 83 ; CHECK-NEXT: store i8 0, i8* %p2 84 store i8 0, i8* %p2 85 br i1 undef, label %c, label %d 86 87 b: 88 ; CHECK: 3 = MemoryDef(1) 89 ; CHECK-NEXT: store i8 1, i8* %p2 90 store i8 1, i8* %p2 91 br i1 undef, label %c, label %d 92 93 c: 94 ; CHECK: 6 = MemoryPhi({a,2},{b,3}) 95 ; CHECK: 4 = MemoryDef(6) 96 ; CHECK-NEXT: store i8 2, i8* %p2 97 store i8 2, i8* %p2 98 br label %e 99 100 d: 101 ; CHECK: 7 = MemoryPhi({a,2},{b,3}) 102 ; CHECK: 5 = MemoryDef(7) 103 ; CHECK-NEXT: store i8 3, i8* %p2 104 store i8 3, i8* %p2 105 br label %e 106 107 e: 108 ; 8 = MemoryPhi({c,4},{d,5}) 109 ; CHECK: MemoryUse(1) 110 ; CHECK-NEXT: load i8, i8* %p1 111 load i8, i8* %p1 112 ret void 113 } 114 115 ; CHECK-LABEL: define void @looped 116 define void @looped(i8* noalias %p1, i8* noalias %p2) { 117 ; CHECK: 1 = MemoryDef(liveOnEntry) 118 ; CHECK-NEXT: store i8 0, i8* %p1 119 store i8 0, i8* %p1 120 br label %loop.1 121 122 loop.1: 123 ; CHECK: 6 = MemoryPhi({%0,1},{loop.3,4}) 124 ; CHECK: 2 = MemoryDef(6) 125 ; CHECK-NEXT: store i8 0, i8* %p2 126 store i8 0, i8* %p2 127 br i1 undef, label %loop.2, label %loop.3 128 129 loop.2: 130 ; CHECK: 5 = MemoryPhi({loop.1,2},{loop.3,4}) 131 ; CHECK: 3 = MemoryDef(5) 132 ; CHECK-NEXT: store i8 1, i8* %p2 133 store i8 1, i8* %p2 134 br label %loop.3 135 136 loop.3: 137 ; CHECK: 7 = MemoryPhi({loop.1,2},{loop.2,3}) 138 ; CHECK: 4 = MemoryDef(7) 139 ; CHECK-NEXT: store i8 2, i8* %p2 140 store i8 2, i8* %p2 141 ; CHECK: MemoryUse(1) 142 ; CHECK-NEXT: load i8, i8* %p1 143 load i8, i8* %p1 144 br i1 undef, label %loop.2, label %loop.1 145 } 146 147 ; CHECK-LABEL: define void @looped_visitedonlyonce 148 define void @looped_visitedonlyonce(i8* noalias %p1, i8* noalias %p2) { 149 br label %while.cond 150 151 while.cond: 152 ; CHECK: 5 = MemoryPhi({%0,liveOnEntry},{if.end,3}) 153 ; CHECK-NEXT: br i1 undef, label %if.then, label %if.end 154 br i1 undef, label %if.then, label %if.end 155 156 if.then: 157 ; CHECK: 1 = MemoryDef(5) 158 ; CHECK-NEXT: store i8 0, i8* %p1 159 store i8 0, i8* %p1 160 br i1 undef, label %if.end, label %if.then2 161 162 if.then2: 163 ; CHECK: 2 = MemoryDef(1) 164 ; CHECK-NEXT: store i8 1, i8* %p2 165 store i8 1, i8* %p2 166 br label %if.end 167 168 if.end: 169 ; CHECK: 4 = MemoryPhi({while.cond,5},{if.then,1},{if.then2,2}) 170 ; CHECK: MemoryUse(4) 171 ; CHECK-NEXT: load i8, i8* %p1 172 load i8, i8* %p1 173 ; CHECK: 3 = MemoryDef(4) 174 ; CHECK-NEXT: store i8 2, i8* %p2 175 store i8 2, i8* %p2 176 ; CHECK: MemoryUse(4) 177 ; CHECK-NEXT: load i8, i8* %p1 178 load i8, i8* %p1 179 br label %while.cond 180 } 181 182
