1 ; RUN: opt -print-memderefs -analyze -S <%s | FileCheck %s
3 ; Uses the print-deref (+ analyze to print) pass to run
4 ; isDereferenceablePointer() on many load instruction operands
6 target datalayout = "e"
8 declare zeroext i1 @return_i1()
11 @globalstr = global [6 x i8] c"hello\00"
12 @globali32ptr = external global i32*
14 %struct.A = type { [8 x i8], [5 x i8] }
15 @globalstruct = external global %struct.A
17 @globalptr.align1 = external global i8, align 1
18 @globalptr.align16 = external global i8, align 16
20 define void @test(i32 addrspace(1)* dereferenceable(8) %dparam,
21 i8 addrspace(1)* dereferenceable(32) align 1 %dparam.align1,
22 i8 addrspace(1)* dereferenceable(32) align 16 %dparam.align16)
23 gc "statepoint-example" {
24 ; CHECK: The following are dereferenceable:
26 ; CHECK: %globalptr{{.*}}(aligned)
27 %globalptr = getelementptr inbounds [6 x i8], [6 x i8]* @globalstr, i32 0, i32 0
28 %load1 = load i8, i8* %globalptr
30 ; CHECK: %alloca{{.*}}(aligned)
32 %load2 = load i1, i1* %alloca
34 ; CHECK: %dparam{{.*}}(aligned)
35 %load3 = load i32, i32 addrspace(1)* %dparam
37 ; CHECK: %relocate{{.*}}(aligned)
38 %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)
39 %relocate = call i32 addrspace(1)* @llvm.experimental.gc.relocate.p1i32(i32 %tok, i32 7, i32 7)
40 %load4 = load i32, i32 addrspace(1)* %relocate
43 %nparam = getelementptr i32, i32 addrspace(1)* %dparam, i32 5
44 %load5 = load i32, i32 addrspace(1)* %nparam
46 ; Load from a non-dereferenceable load
48 %nd_load = load i32*, i32** @globali32ptr
49 %load6 = load i32, i32* %nd_load
51 ; Load from a dereferenceable load
52 ; CHECK: %d4_load{{.*}}(aligned)
53 %d4_load = load i32*, i32** @globali32ptr, !dereferenceable !0
54 %load7 = load i32, i32* %d4_load
56 ; Load from an offset not covered by the dereferenceable portion
58 %d2_load = load i32*, i32** @globali32ptr, !dereferenceable !1
59 %load8 = load i32, i32* %d2_load
61 ; Load from a potentially null pointer with dereferenceable_or_null
62 ; CHECK-NOT: %d_or_null_load
63 %d_or_null_load = load i32*, i32** @globali32ptr, !dereferenceable_or_null !0
64 %load9 = load i32, i32* %d_or_null_load
66 ; Load from a non-null pointer with dereferenceable_or_null
67 ; CHECK: %d_or_null_non_null_load{{.*}}(aligned)
68 %d_or_null_non_null_load = load i32*, i32** @globali32ptr, !nonnull !2, !dereferenceable_or_null !0
69 %load10 = load i32, i32* %d_or_null_non_null_load
71 ; It's OK to overrun static array size as long as we stay within underlying object size
72 ; CHECK: %within_allocation{{.*}}(aligned)
73 %within_allocation = getelementptr inbounds %struct.A, %struct.A* @globalstruct, i64 0, i32 0, i64 10
74 %load11 = load i8, i8* %within_allocation
76 ; GEP is outside the underlying object size
77 ; CHECK-NOT: %outside_allocation
78 %outside_allocation = getelementptr inbounds %struct.A, %struct.A* @globalstruct, i64 0, i32 1, i64 10
79 %load12 = load i8, i8* %outside_allocation
81 ; Loads from aligned globals
82 ; CHECK: @globalptr.align1{{.*}}(unaligned)
83 ; CHECK: @globalptr.align16{{.*}}(aligned)
84 %load13 = load i8, i8* @globalptr.align1, align 16
85 %load14 = load i8, i8* @globalptr.align16, align 16
87 ; Loads from aligned arguments
88 ; CHECK: %dparam.align1{{.*}}(unaligned)
89 ; CHECK: %dparam.align16{{.*}}(aligned)
90 %load15 = load i8, i8 addrspace(1)* %dparam.align1, align 16
91 %load16 = load i8, i8 addrspace(1)* %dparam.align16, align 16
93 ; Loads from aligned allocas
94 ; CHECK: %alloca.align1{{.*}}(unaligned)
95 ; CHECK: %alloca.align16{{.*}}(aligned)
96 %alloca.align1 = alloca i1, align 1
97 %alloca.align16 = alloca i1, align 16
98 %load17 = load i1, i1* %alloca.align1, align 16
99 %load18 = load i1, i1* %alloca.align16, align 16
102 ; CHECK: %gep.align1.offset1{{.*}}(unaligned)
103 ; CHECK: %gep.align16.offset1{{.*}}(unaligned)
104 ; CHECK: %gep.align1.offset16{{.*}}(unaligned)
105 ; CHECK: %gep.align16.offset16{{.*}}(aligned)
106 %gep.align1.offset1 = getelementptr inbounds i8, i8 addrspace(1)* %dparam.align1, i32 1
107 %gep.align16.offset1 = getelementptr inbounds i8, i8 addrspace(1)* %dparam.align16, i32 1
108 %gep.align1.offset16 = getelementptr inbounds i8, i8 addrspace(1)* %dparam.align1, i32 16
109 %gep.align16.offset16 = getelementptr inbounds i8, i8 addrspace(1)* %dparam.align16, i32 16
110 %load19 = load i8, i8 addrspace(1)* %gep.align1.offset1, align 16
111 %load20 = load i8, i8 addrspace(1)* %gep.align16.offset1, align 16
112 %load21 = load i8, i8 addrspace(1)* %gep.align1.offset16, align 16
113 %load22 = load i8, i8 addrspace(1)* %gep.align16.offset16, align 16
115 ; CHECK-NOT: %no_deref_return
116 ; CHECK: %deref_return{{.*}}(unaligned)
117 ; CHECK: %deref_and_aligned_return{{.*}}(aligned)
118 %no_deref_return = call i32* @foo()
119 %deref_return = call dereferenceable(32) i32* @foo()
120 %deref_and_aligned_return = call dereferenceable(32) align 16 i32* @foo()
121 %load23 = load i32, i32* %no_deref_return
122 %load24 = load i32, i32* %deref_return, align 16
123 %load25 = load i32, i32* %deref_and_aligned_return, align 16
128 declare i32 @llvm.experimental.gc.statepoint.p0f_i1f(i64, i32, i1 ()*, i32, i32, ...)
129 declare i32 addrspace(1)* @llvm.experimental.gc.relocate.p1i32(i32, i32, i32)