1 ; RUN: opt -print-memderefs -analyze -S <%s | FileCheck %s 2 3 ; Uses the print-deref (+ analyze to print) pass to run 4 ; isDereferenceablePointer() on many load instruction operands 5 6 target datalayout = "e-i32:32:64" 7 8 %TypeOpaque = type opaque 9 10 declare zeroext i1 @return_i1() 11 12 declare i32* @foo() 13 @globalstr = global [6 x i8] c"hello\00" 14 @globali32ptr = external global i32* 15 16 %struct.A = type { [8 x i8], [5 x i8] } 17 @globalstruct = external global %struct.A 18 19 @globalptr.align1 = external global i8, align 1 20 @globalptr.align16 = external global i8, align 16 21 22 ; CHECK-LABEL: 'test' 23 define void @test(i32 addrspace(1)* dereferenceable(8) %dparam, 24 i8 addrspace(1)* dereferenceable(32) align 1 %dparam.align1, 25 i8 addrspace(1)* dereferenceable(32) align 16 %dparam.align16) 26 gc "statepoint-example" { 27 ; CHECK: The following are dereferenceable: 28 entry: 29 ; CHECK: %globalptr{{.*}}(aligned) 30 %globalptr = getelementptr inbounds [6 x i8], [6 x i8]* @globalstr, i32 0, i32 0 31 %load1 = load i8, i8* %globalptr 32 33 ; CHECK: %alloca{{.*}}(aligned) 34 %alloca = alloca i1 35 %load2 = load i1, i1* %alloca 36 37 ; CHECK: %dparam{{.*}}(aligned) 38 %load3 = load i32, i32 addrspace(1)* %dparam 39 40 ; CHECK: %relocate{{.*}}(aligned) 41 %tok = tail call token (i64, i32, i1 ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_i1f(i64 0, i32 0, i1 ()* @return_i1, i32 0, i32 0, i32 0, i32 0, i32 addrspace(1)* %dparam) 42 %relocate = call i32 addrspace(1)* @llvm.experimental.gc.relocate.p1i32(token %tok, i32 7, i32 7) 43 %load4 = load i32, i32 addrspace(1)* %relocate 44 45 ; CHECK-NOT: %nparam 46 %dpa = call i32 addrspace(1)* @func1(i32 addrspace(1)* %dparam) 47 %nparam = getelementptr i32, i32 addrspace(1)* %dpa, i32 5 48 %load5 = load i32, i32 addrspace(1)* %nparam 49 50 ; Load from a non-dereferenceable load 51 ; CHECK-NOT: %nd_load 52 %nd_load = load i32*, i32** @globali32ptr 53 %load6 = load i32, i32* %nd_load 54 55 ; Load from a dereferenceable load 56 ; CHECK: %d4_load{{.*}}(aligned) 57 %d4_load = load i32*, i32** @globali32ptr, !dereferenceable !0 58 %load7 = load i32, i32* %d4_load 59 60 ; Load from an offset not covered by the dereferenceable portion 61 ; CHECK-NOT: %d2_load 62 %d2_load = load i32*, i32** @globali32ptr, !dereferenceable !1 63 %load8 = load i32, i32* %d2_load 64 65 ; Load from a potentially null pointer with dereferenceable_or_null 66 ; CHECK-NOT: %d_or_null_load 67 %d_or_null_load = load i32*, i32** @globali32ptr, !dereferenceable_or_null !0 68 %load9 = load i32, i32* %d_or_null_load 69 70 ; Load from a non-null pointer with dereferenceable_or_null 71 ; CHECK: %d_or_null_non_null_load{{.*}}(aligned) 72 %d_or_null_non_null_load = load i32*, i32** @globali32ptr, !nonnull !2, !dereferenceable_or_null !0 73 %load10 = load i32, i32* %d_or_null_non_null_load 74 75 ; It's OK to overrun static array size as long as we stay within underlying object size 76 ; CHECK: %within_allocation{{.*}}(aligned) 77 %within_allocation = getelementptr inbounds %struct.A, %struct.A* @globalstruct, i64 0, i32 0, i64 10 78 %load11 = load i8, i8* %within_allocation 79 80 ; GEP is outside the underlying object size 81 ; CHECK-NOT: %outside_allocation 82 %outside_allocation = getelementptr inbounds %struct.A, %struct.A* @globalstruct, i64 0, i32 1, i64 10 83 %load12 = load i8, i8* %outside_allocation 84 85 ; Loads from aligned globals 86 ; CHECK: @globalptr.align1{{.*}}(unaligned) 87 ; CHECK: @globalptr.align16{{.*}}(aligned) 88 %load13 = load i8, i8* @globalptr.align1, align 16 89 %load14 = load i8, i8* @globalptr.align16, align 16 90 91 ; Loads from aligned arguments 92 ; CHECK: %dparam.align1{{.*}}(unaligned) 93 ; CHECK: %dparam.align16{{.*}}(aligned) 94 %load15 = load i8, i8 addrspace(1)* %dparam.align1, align 16 95 %load16 = load i8, i8 addrspace(1)* %dparam.align16, align 16 96 97 ; Loads from aligned allocas 98 ; CHECK: %alloca.align1{{.*}}(unaligned) 99 ; CHECK: %alloca.align16{{.*}}(aligned) 100 %alloca.align1 = alloca i1, align 1 101 %alloca.align16 = alloca i1, align 16 102 %load17 = load i1, i1* %alloca.align1, align 16 103 %load18 = load i1, i1* %alloca.align16, align 16 104 105 ; Loads from GEPs 106 ; CHECK: %gep.align1.offset1{{.*}}(unaligned) 107 ; CHECK: %gep.align16.offset1{{.*}}(unaligned) 108 ; CHECK: %gep.align1.offset16{{.*}}(unaligned) 109 ; CHECK: %gep.align16.offset16{{.*}}(aligned) 110 %gep.align1.offset1 = getelementptr inbounds i8, i8 addrspace(1)* %dparam.align1, i32 1 111 %gep.align16.offset1 = getelementptr inbounds i8, i8 addrspace(1)* %dparam.align16, i32 1 112 %gep.align1.offset16 = getelementptr inbounds i8, i8 addrspace(1)* %dparam.align1, i32 16 113 %gep.align16.offset16 = getelementptr inbounds i8, i8 addrspace(1)* %dparam.align16, i32 16 114 %load19 = load i8, i8 addrspace(1)* %gep.align1.offset1, align 16 115 %load20 = load i8, i8 addrspace(1)* %gep.align16.offset1, align 16 116 %load21 = load i8, i8 addrspace(1)* %gep.align1.offset16, align 16 117 %load22 = load i8, i8 addrspace(1)* %gep.align16.offset16, align 16 118 119 ; CHECK-NOT: %no_deref_return 120 ; CHECK: %deref_return{{.*}}(unaligned) 121 ; CHECK: %deref_and_aligned_return{{.*}}(aligned) 122 %no_deref_return = call i32* @foo() 123 %deref_return = call dereferenceable(32) i32* @foo() 124 %deref_and_aligned_return = call dereferenceable(32) align 16 i32* @foo() 125 %load23 = load i32, i32* %no_deref_return 126 %load24 = load i32, i32* %deref_return, align 16 127 %load25 = load i32, i32* %deref_and_aligned_return, align 16 128 129 ; Load from a dereferenceable and aligned load 130 ; CHECK: %d4_unaligned_load{{.*}}(unaligned) 131 ; CHECK: %d4_aligned_load{{.*}}(aligned) 132 %d4_unaligned_load = load i32*, i32** @globali32ptr, !dereferenceable !0 133 %d4_aligned_load = load i32*, i32** @globali32ptr, !dereferenceable !0, !align !{i64 16} 134 %load26 = load i32, i32* %d4_unaligned_load, align 16 135 %load27 = load i32, i32* %d4_aligned_load, align 16 136 137 ; Alloca with no explicit alignment is aligned to preferred alignment of 138 ; the type (specified by datalayout string). 139 ; CHECK: %alloca.noalign{{.*}}(aligned) 140 %alloca.noalign = alloca i32 141 %load28 = load i32, i32* %alloca.noalign, align 8 142 143 ret void 144 } 145 146 ; Just check that we don't crash. 147 ; CHECK-LABEL: 'opaque_type_crasher' 148 define void @opaque_type_crasher(%TypeOpaque* dereferenceable(16) %a) { 149 entry: 150 %bc = bitcast %TypeOpaque* %a to i8* 151 %ptr8 = getelementptr inbounds i8, i8* %bc, i32 8 152 %ptr32 = bitcast i8* %ptr8 to i32* 153 br i1 undef, label %if.then, label %if.end 154 155 if.then: 156 %res = load i32, i32* %ptr32, align 4 157 br label %if.end 158 159 if.end: 160 ret void 161 } 162 163 declare token @llvm.experimental.gc.statepoint.p0f_i1f(i64, i32, i1 ()*, i32, i32, ...) 164 declare i32 addrspace(1)* @llvm.experimental.gc.relocate.p1i32(token, i32, i32) 165 166 declare i32 addrspace(1)* @func1(i32 addrspace(1)* returned) nounwind argmemonly 167 168 !0 = !{i64 4} 169 !1 = !{i64 2} 170 !2 = !{} 171
