1; RUN: opt -instcombine -S < %s | FileCheck %s
2
3target datalayout = "e-m:e-p:64:64:64-i64:64-f80:128-n8:16:32:64-S128"
4
5define i32 @test_load_cast_combine_tbaa(float* %ptr) {
6; Ensure (cast (load (...))) -> (load (cast (...))) preserves TBAA.
7; CHECK-LABEL: @test_load_cast_combine_tbaa(
8; CHECK: load i32, i32* %{{.*}}, !tbaa !0
9entry:
10  %l = load float, float* %ptr, !tbaa !0
11  %c = bitcast float %l to i32
12  ret i32 %c
13}
14
15define i32 @test_load_cast_combine_noalias(float* %ptr) {
16; Ensure (cast (load (...))) -> (load (cast (...))) preserves no-alias metadata.
17; CHECK-LABEL: @test_load_cast_combine_noalias(
18; CHECK: load i32, i32* %{{.*}}, !alias.scope !2, !noalias !1
19entry:
20  %l = load float, float* %ptr, !alias.scope !2, !noalias !1
21  %c = bitcast float %l to i32
22  ret i32 %c
23}
24
25define float @test_load_cast_combine_range(i32* %ptr) {
26; Ensure (cast (load (...))) -> (load (cast (...))) drops range metadata. It
27; would be nice to preserve or update it somehow but this is hard when moving
28; between types.
29; CHECK-LABEL: @test_load_cast_combine_range(
30; CHECK: load float, float* %{{.*}}
31; CHECK-NOT: !range
32; CHECK: ret float
33entry:
34  %l = load i32, i32* %ptr, !range !6
35  %c = bitcast i32 %l to float
36  ret float %c
37}
38
39define i32 @test_load_cast_combine_invariant(float* %ptr) {
40; Ensure (cast (load (...))) -> (load (cast (...))) preserves invariant metadata.
41; CHECK-LABEL: @test_load_cast_combine_invariant(
42; CHECK: load i32, i32* %{{.*}}, !invariant.load !3
43entry:
44  %l = load float, float* %ptr, !invariant.load !3
45  %c = bitcast float %l to i32
46  ret i32 %c
47}
48
49define i32 @test_load_cast_combine_nontemporal(float* %ptr) {
50; Ensure (cast (load (...))) -> (load (cast (...))) preserves nontemporal
51; metadata.
52; CHECK-LABEL: @test_load_cast_combine_nontemporal(
53; CHECK: load i32, i32* %{{.*}}, !nontemporal !4
54entry:
55  %l = load float, float* %ptr, !nontemporal !4
56  %c = bitcast float %l to i32
57  ret i32 %c
58}
59
60define i8* @test_load_cast_combine_align(i32** %ptr) {
61; Ensure (cast (load (...))) -> (load (cast (...))) preserves align
62; metadata.
63; CHECK-LABEL: @test_load_cast_combine_align(
64; CHECK: load i8*, i8** %{{.*}}, !align !5
65entry:
66  %l = load i32*, i32** %ptr, !align !5
67  %c = bitcast i32* %l to i8*
68  ret i8* %c
69}
70
71define i8* @test_load_cast_combine_deref(i32** %ptr) {
72; Ensure (cast (load (...))) -> (load (cast (...))) preserves dereferenceable
73; metadata.
74; CHECK-LABEL: @test_load_cast_combine_deref(
75; CHECK: load i8*, i8** %{{.*}}, !dereferenceable !5
76entry:
77  %l = load i32*, i32** %ptr, !dereferenceable !5
78  %c = bitcast i32* %l to i8*
79  ret i8* %c
80}
81
82define i8* @test_load_cast_combine_deref_or_null(i32** %ptr) {
83; Ensure (cast (load (...))) -> (load (cast (...))) preserves
84; dereferenceable_or_null metadata.
85; CHECK-LABEL: @test_load_cast_combine_deref_or_null(
86; CHECK: load i8*, i8** %{{.*}}, !dereferenceable_or_null !5
87entry:
88  %l = load i32*, i32** %ptr, !dereferenceable_or_null !5
89  %c = bitcast i32* %l to i8*
90  ret i8* %c
91}
92
93define void @test_load_cast_combine_loop(float* %src, i32* %dst, i32 %n) {
94; Ensure (cast (load (...))) -> (load (cast (...))) preserves loop access
95; metadata.
96; CHECK-LABEL: @test_load_cast_combine_loop(
97; CHECK: load i32, i32* %{{.*}}, !llvm.mem.parallel_loop_access !1
98entry:
99  br label %loop
100
101loop:
102  %i = phi i32 [ 0, %entry ], [ %i.next, %loop ]
103  %src.gep = getelementptr inbounds float, float* %src, i32 %i
104  %dst.gep = getelementptr inbounds i32, i32* %dst, i32 %i
105  %l = load float, float* %src.gep, !llvm.mem.parallel_loop_access !1
106  %c = bitcast float %l to i32
107  store i32 %c, i32* %dst.gep
108  %i.next = add i32 %i, 1
109  %cmp = icmp slt i32 %i.next, %n
110  br i1 %cmp, label %loop, label %exit, !llvm.loop !1
111
112exit:
113  ret void
114}
115
116define void @test_load_cast_combine_nonnull(float** %ptr) {
117; We can't preserve nonnull metadata when converting a load of a pointer to
118; a load of an integer. Instead, we translate it to range metadata.
119; FIXME: We should also transform range metadata back into nonnull metadata.
120; FIXME: This test is very fragile. If any LABEL lines are added after
121; this point, the test will fail, because this test depends on a metadata tuple,
122; which is always emitted at the end of the file. At some point, we should
123; consider an option to the IR printer to emit MD tuples after the function
124; that first uses them--this will allow us to refer to them like this and not
125; have the tests break. For now, this function must always come last in this
126; file, and no LABEL lines are to be added after this point.
127;
128; CHECK-LABEL: @test_load_cast_combine_nonnull(
129; CHECK: %[[V:.*]] = load i64, i64* %{{.*}}, !range ![[MD:[0-9]+]]
130; CHECK-NOT: !nonnull
131; CHECK: store i64 %[[V]], i64*
132entry:
133  %p = load float*, float** %ptr, !nonnull !3
134  %gep = getelementptr float*, float** %ptr, i32 42
135  store float* %p, float** %gep
136  ret void
137}
138
139; This is the metadata tuple that we reference above:
140; CHECK: ![[MD]] = !{i64 1, i64 0}
141!0 = !{ !1, !1, i64 0 }
142!1 = !{ !1 }
143!2 = !{ !2, !1 }
144!3 = !{ }
145!4 = !{ i32 1 }
146!5 = !{ i64 8 }
147!6 = !{ i32 0, i32 42 }
148