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" 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 i32 (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(i32 %tok, i32 7, i32 7) 43 %load4 = load i32, i32 addrspace(1)* %relocate 44 45 ; CHECK-NOT: %nparam 46 %nparam = getelementptr i32, i32 addrspace(1)* %dparam, i32 5 47 %load5 = load i32, i32 addrspace(1)* %nparam 48 49 ; Load from a non-dereferenceable load 50 ; CHECK-NOT: %nd_load 51 %nd_load = load i32*, i32** @globali32ptr 52 %load6 = load i32, i32* %nd_load 53 54 ; Load from a dereferenceable load 55 ; CHECK: %d4_load{{.*}}(aligned) 56 %d4_load = load i32*, i32** @globali32ptr, !dereferenceable !0 57 %load7 = load i32, i32* %d4_load 58 59 ; Load from an offset not covered by the dereferenceable portion 60 ; CHECK-NOT: %d2_load 61 %d2_load = load i32*, i32** @globali32ptr, !dereferenceable !1 62 %load8 = load i32, i32* %d2_load 63 64 ; Load from a potentially null pointer with dereferenceable_or_null 65 ; CHECK-NOT: %d_or_null_load 66 %d_or_null_load = load i32*, i32** @globali32ptr, !dereferenceable_or_null !0 67 %load9 = load i32, i32* %d_or_null_load 68 69 ; Load from a non-null pointer with dereferenceable_or_null 70 ; CHECK: %d_or_null_non_null_load{{.*}}(aligned) 71 %d_or_null_non_null_load = load i32*, i32** @globali32ptr, !nonnull !2, !dereferenceable_or_null !0 72 %load10 = load i32, i32* %d_or_null_non_null_load 73 74 ; It's OK to overrun static array size as long as we stay within underlying object size 75 ; CHECK: %within_allocation{{.*}}(aligned) 76 %within_allocation = getelementptr inbounds %struct.A, %struct.A* @globalstruct, i64 0, i32 0, i64 10 77 %load11 = load i8, i8* %within_allocation 78 79 ; GEP is outside the underlying object size 80 ; CHECK-NOT: %outside_allocation 81 %outside_allocation = getelementptr inbounds %struct.A, %struct.A* @globalstruct, i64 0, i32 1, i64 10 82 %load12 = load i8, i8* %outside_allocation 83 84 ; Loads from aligned globals 85 ; CHECK: @globalptr.align1{{.*}}(unaligned) 86 ; CHECK: @globalptr.align16{{.*}}(aligned) 87 %load13 = load i8, i8* @globalptr.align1, align 16 88 %load14 = load i8, i8* @globalptr.align16, align 16 89 90 ; Loads from aligned arguments 91 ; CHECK: %dparam.align1{{.*}}(unaligned) 92 ; CHECK: %dparam.align16{{.*}}(aligned) 93 %load15 = load i8, i8 addrspace(1)* %dparam.align1, align 16 94 %load16 = load i8, i8 addrspace(1)* %dparam.align16, align 16 95 96 ; Loads from aligned allocas 97 ; CHECK: %alloca.align1{{.*}}(unaligned) 98 ; CHECK: %alloca.align16{{.*}}(aligned) 99 %alloca.align1 = alloca i1, align 1 100 %alloca.align16 = alloca i1, align 16 101 %load17 = load i1, i1* %alloca.align1, align 16 102 %load18 = load i1, i1* %alloca.align16, align 16 103 104 ; Loads from GEPs 105 ; CHECK: %gep.align1.offset1{{.*}}(unaligned) 106 ; CHECK: %gep.align16.offset1{{.*}}(unaligned) 107 ; CHECK: %gep.align1.offset16{{.*}}(unaligned) 108 ; CHECK: %gep.align16.offset16{{.*}}(aligned) 109 %gep.align1.offset1 = getelementptr inbounds i8, i8 addrspace(1)* %dparam.align1, i32 1 110 %gep.align16.offset1 = getelementptr inbounds i8, i8 addrspace(1)* %dparam.align16, i32 1 111 %gep.align1.offset16 = getelementptr inbounds i8, i8 addrspace(1)* %dparam.align1, i32 16 112 %gep.align16.offset16 = getelementptr inbounds i8, i8 addrspace(1)* %dparam.align16, i32 16 113 %load19 = load i8, i8 addrspace(1)* %gep.align1.offset1, align 16 114 %load20 = load i8, i8 addrspace(1)* %gep.align16.offset1, align 16 115 %load21 = load i8, i8 addrspace(1)* %gep.align1.offset16, align 16 116 %load22 = load i8, i8 addrspace(1)* %gep.align16.offset16, align 16 117 118 ; CHECK-NOT: %no_deref_return 119 ; CHECK: %deref_return{{.*}}(unaligned) 120 ; CHECK: %deref_and_aligned_return{{.*}}(aligned) 121 %no_deref_return = call i32* @foo() 122 %deref_return = call dereferenceable(32) i32* @foo() 123 %deref_and_aligned_return = call dereferenceable(32) align 16 i32* @foo() 124 %load23 = load i32, i32* %no_deref_return 125 %load24 = load i32, i32* %deref_return, align 16 126 %load25 = load i32, i32* %deref_and_aligned_return, align 16 127 128 ; Load from a dereferenceable and aligned load 129 ; CHECK: %d4_unaligned_load{{.*}}(unaligned) 130 ; CHECK: %d4_aligned_load{{.*}}(aligned) 131 %d4_unaligned_load = load i32*, i32** @globali32ptr, !dereferenceable !0 132 %d4_aligned_load = load i32*, i32** @globali32ptr, !dereferenceable !0, !align !{i64 16} 133 %load26 = load i32, i32* %d4_unaligned_load, align 16 134 %load27 = load i32, i32* %d4_aligned_load, align 16 135 136 ret void 137 } 138 139 ; Just check that we don't crash. 140 ; CHECK-LABEL: 'opaque_type_crasher' 141 define void @opaque_type_crasher(%TypeOpaque* dereferenceable(16) %a) { 142 entry: 143 %bc = bitcast %TypeOpaque* %a to i8* 144 %ptr8 = getelementptr inbounds i8, i8* %bc, i32 8 145 %ptr32 = bitcast i8* %ptr8 to i32* 146 br i1 undef, label %if.then, label %if.end 147 148 if.then: 149 %res = load i32, i32* %ptr32, align 4 150 br label %if.end 151 152 if.end: 153 ret void 154 } 155 156 declare i32 @llvm.experimental.gc.statepoint.p0f_i1f(i64, i32, i1 ()*, i32, i32, ...) 157 declare i32 addrspace(1)* @llvm.experimental.gc.relocate.p1i32(i32, i32, i32) 158 159 !0 = !{i64 4} 160 !1 = !{i64 2} 161 !2 = !{} 162
