1; This testcase tests for various features the basicaa test should be able to
2; determine, as noted in the comments.
3
4; RUN: opt < %s -basicaa -gvn -instcombine -dce -S | FileCheck %s
5target datalayout = "E-p:64:64:64-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128"
6
7@Global = external global { i32 }
8
9declare void @external(i32*)
10
11; Array test:  Test that operations on one local array do not invalidate
12; operations on another array.  Important for scientific codes.
13;
14define i32 @different_array_test(i64 %A, i64 %B) {
15	%Array1 = alloca i32, i32 100
16	%Array2 = alloca i32, i32 200
17
18        call void @external(i32* %Array1)
19        call void @external(i32* %Array2)
20
21	%pointer = getelementptr i32* %Array1, i64 %A
22	%val = load i32* %pointer
23
24	%pointer2 = getelementptr i32* %Array2, i64 %B
25	store i32 7, i32* %pointer2
26
27	%REMOVE = load i32* %pointer ; redundant with above load
28	%retval = sub i32 %REMOVE, %val
29	ret i32 %retval
30; CHECK: @different_array_test
31; CHECK: ret i32 0
32}
33
34; Constant index test: Constant indexes into the same array should not
35; interfere with each other.  Again, important for scientific codes.
36;
37define i32 @constant_array_index_test() {
38	%Array = alloca i32, i32 100
39        call void @external(i32* %Array)
40
41	%P1 = getelementptr i32* %Array, i64 7
42	%P2 = getelementptr i32* %Array, i64 6
43
44	%A = load i32* %P1
45	store i32 1, i32* %P2   ; Should not invalidate load
46	%BREMOVE = load i32* %P1
47	%Val = sub i32 %A, %BREMOVE
48	ret i32 %Val
49; CHECK: @constant_array_index_test
50; CHECK: ret i32 0
51}
52
53; Test that if two pointers are spaced out by a constant getelementptr, that
54; they cannot alias.
55define i32 @gep_distance_test(i32* %A) {
56        %REMOVEu = load i32* %A
57        %B = getelementptr i32* %A, i64 2  ; Cannot alias A
58        store i32 7, i32* %B
59        %REMOVEv = load i32* %A
60        %r = sub i32 %REMOVEu, %REMOVEv
61        ret i32 %r
62; CHECK: @gep_distance_test
63; CHECK: ret i32 0
64}
65
66; Test that if two pointers are spaced out by a constant offset, that they
67; cannot alias, even if there is a variable offset between them...
68define i32 @gep_distance_test2({i32,i32}* %A, i64 %distance) {
69	%A1 = getelementptr {i32,i32}* %A, i64 0, i32 0
70	%REMOVEu = load i32* %A1
71	%B = getelementptr {i32,i32}* %A, i64 %distance, i32 1
72	store i32 7, i32* %B    ; B cannot alias A, it's at least 4 bytes away
73	%REMOVEv = load i32* %A1
74        %r = sub i32 %REMOVEu, %REMOVEv
75        ret i32 %r
76; CHECK: @gep_distance_test2
77; CHECK: ret i32 0
78}
79
80; Test that we can do funny pointer things and that distance calc will still
81; work.
82define i32 @gep_distance_test3(i32 * %A) {
83	%X = load i32* %A
84	%B = bitcast i32* %A to i8*
85	%C = getelementptr i8* %B, i64 4
86        store i8 42, i8* %C
87	%Y = load i32* %A
88        %R = sub i32 %X, %Y
89	ret i32 %R
90; CHECK: @gep_distance_test3
91; CHECK: ret i32 0
92}
93
94; Test that we can disambiguate globals reached through constantexpr geps
95define i32 @constexpr_test() {
96   %X = alloca i32
97   call void @external(i32* %X)
98
99   %Y = load i32* %X
100   store i32 5, i32* getelementptr ({ i32 }* @Global, i64 0, i32 0)
101   %REMOVE = load i32* %X
102   %retval = sub i32 %Y, %REMOVE
103   ret i32 %retval
104; CHECK: @constexpr_test
105; CHECK: ret i32 0
106}
107
108
109
110; PR7589
111; These two index expressions are different, this cannot be CSE'd.
112define i16 @zext_sext_confusion(i16* %row2col, i5 %j) nounwind{
113entry:
114  %sum5.cast = zext i5 %j to i64             ; <i64> [#uses=1]
115  %P1 = getelementptr i16* %row2col, i64 %sum5.cast
116  %row2col.load.1.2 = load i16* %P1, align 1 ; <i16> [#uses=1]
117
118  %sum13.cast31 = sext i5 %j to i6          ; <i6> [#uses=1]
119  %sum13.cast = zext i6 %sum13.cast31 to i64      ; <i64> [#uses=1]
120  %P2 = getelementptr i16* %row2col, i64 %sum13.cast
121  %row2col.load.1.6 = load i16* %P2, align 1 ; <i16> [#uses=1]
122
123  %.ret = sub i16 %row2col.load.1.6, %row2col.load.1.2 ; <i16> [#uses=1]
124  ret i16 %.ret
125; CHECK: @zext_sext_confusion
126; CHECK: ret i16 %.ret
127}
128