xref: /llvm-project/llvm/test/Transforms/MemCpyOpt/memcpy-undef.ll (revision a11faeed446882a81e79d780125d93e7199df645)
1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2; RUN: opt < %s -passes=memcpyopt -S -verify-memoryssa | FileCheck %s
3
4target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
5target triple = "x86_64-apple-macosx10.8.0"
6
7%struct.foo = type { i8, [7 x i8], i32 }
8
9; Check that the memcpy is removed.
10define i32 @test1(ptr nocapture %foobie) nounwind noinline ssp uwtable {
11; CHECK-LABEL: @test1(
12; CHECK-NEXT:    [[BLETCH_SROA_1:%.*]] = alloca [7 x i8], align 1
13; CHECK-NEXT:    store i8 98, ptr [[FOOBIE:%.*]], align 4
14; CHECK-NEXT:    [[TMP1:%.*]] = getelementptr inbounds [[STRUCT_FOO:%.*]], ptr [[FOOBIE]], i64 0, i32 1, i64 0
15; CHECK-NEXT:    [[TMP2:%.*]] = getelementptr inbounds [[STRUCT_FOO]], ptr [[FOOBIE]], i64 0, i32 2
16; CHECK-NEXT:    store i32 20, ptr [[TMP2]], align 4
17; CHECK-NEXT:    ret i32 undef
18;
19  %bletch.sroa.1 = alloca [7 x i8], align 1
20  store i8 98, ptr %foobie, align 4
21  %1 = getelementptr inbounds %struct.foo, ptr %foobie, i64 0, i32 1, i64 0
22  call void @llvm.memcpy.p0.p0.i64(ptr %1, ptr %bletch.sroa.1, i64 7, i1 false)
23  %2 = getelementptr inbounds %struct.foo, ptr %foobie, i64 0, i32 2
24  store i32 20, ptr %2, align 4
25  ret i32 undef
26}
27
28; Check that the memcpy is removed.
29define void @test2(ptr sret(i8) noalias nocapture %out, ptr %in) nounwind noinline ssp uwtable {
30; CHECK-LABEL: @test2(
31; CHECK-NEXT:    call void @llvm.lifetime.start.p0(i64 8, ptr [[IN:%.*]])
32; CHECK-NEXT:    ret void
33;
34  call void @llvm.lifetime.start.p0(i64 8, ptr %in)
35  call void @llvm.memcpy.p0.p0.i64(ptr %out, ptr %in, i64 8, i1 false)
36  ret void
37}
38
39; Check that the memcpy is not removed.
40define void @test3(ptr sret(i8) noalias nocapture %out, ptr %in) nounwind noinline ssp uwtable {
41; CHECK-LABEL: @test3(
42; CHECK-NEXT:    call void @llvm.lifetime.start.p0(i64 4, ptr [[IN:%.*]])
43; CHECK-NEXT:    call void @llvm.memcpy.p0.p0.i64(ptr [[OUT:%.*]], ptr [[IN]], i64 8, i1 false)
44; CHECK-NEXT:    ret void
45;
46  call void @llvm.lifetime.start.p0(i64 4, ptr %in)
47  call void @llvm.memcpy.p0.p0.i64(ptr %out, ptr %in, i64 8, i1 false)
48  ret void
49}
50
51; Check that the memcpy is not removed.
52define void @test_lifetime_may_alias(ptr %lifetime, ptr %src, ptr %dst) {
53; CHECK-LABEL: @test_lifetime_may_alias(
54; CHECK-NEXT:    call void @llvm.lifetime.start.p0(i64 8, ptr [[LIFETIME:%.*]])
55; CHECK-NEXT:    call void @llvm.memcpy.p0.p0.i64(ptr [[DST:%.*]], ptr [[SRC:%.*]], i64 8, i1 false)
56; CHECK-NEXT:    ret void
57;
58  call void @llvm.lifetime.start.p0(i64 8, ptr %lifetime)
59  call void @llvm.memcpy.p0.p0.i64(ptr %dst, ptr %src, i64 8, i1 false)
60  ret void
61}
62
63; lifetime.start on full alloca size, copy in range.
64define void @test_lifetime_partial_alias_1(ptr noalias %dst) {
65; CHECK-LABEL: @test_lifetime_partial_alias_1(
66; CHECK-NEXT:    [[A:%.*]] = alloca [16 x i8], align 1
67; CHECK-NEXT:    call void @llvm.lifetime.start.p0(i64 16, ptr [[A]])
68; CHECK-NEXT:    [[GEP:%.*]] = getelementptr i8, ptr [[A]], i64 8
69; CHECK-NEXT:    ret void
70;
71  %a = alloca [16 x i8]
72  call void @llvm.lifetime.start.p0(i64 16, ptr %a)
73  %gep = getelementptr i8, ptr %a, i64 8
74  call void @llvm.memcpy.p0.p0.i64(ptr %dst, ptr %gep, i64 8, i1 false)
75  ret void
76}
77
78; lifetime.start on full alloca size, copy out of range.
79define void @test_lifetime_partial_alias_2(ptr noalias %dst) {
80; CHECK-LABEL: @test_lifetime_partial_alias_2(
81; CHECK-NEXT:    [[A:%.*]] = alloca [16 x i8], align 1
82; CHECK-NEXT:    call void @llvm.lifetime.start.p0(i64 16, ptr [[A]])
83; CHECK-NEXT:    [[GEP:%.*]] = getelementptr i8, ptr [[A]], i64 8
84; CHECK-NEXT:    ret void
85;
86  %a = alloca [16 x i8]
87  call void @llvm.lifetime.start.p0(i64 16, ptr %a)
88  %gep = getelementptr i8, ptr %a, i64 8
89  call void @llvm.memcpy.p0.p0.i64(ptr %dst, ptr %gep, i64 16, i1 false)
90  ret void
91}
92
93; lifetime.start on part of alloca, copy in range.
94define void @test_lifetime_partial_alias_3(ptr noalias %dst) {
95; CHECK-LABEL: @test_lifetime_partial_alias_3(
96; CHECK-NEXT:    [[A:%.*]] = alloca [16 x i8], align 1
97; CHECK-NEXT:    call void @llvm.lifetime.start.p0(i64 12, ptr [[A]])
98; CHECK-NEXT:    [[GEP:%.*]] = getelementptr i8, ptr [[A]], i64 8
99; CHECK-NEXT:    call void @llvm.memcpy.p0.p0.i64(ptr [[DST:%.*]], ptr [[GEP]], i64 4, i1 false)
100; CHECK-NEXT:    ret void
101;
102  %a = alloca [16 x i8]
103  call void @llvm.lifetime.start.p0(i64 12, ptr %a)
104  %gep = getelementptr i8, ptr %a, i64 8
105  call void @llvm.memcpy.p0.p0.i64(ptr %dst, ptr %gep, i64 4, i1 false)
106  ret void
107}
108
109; lifetime.start on part of alloca, copy out of range.
110define void @test_lifetime_partial_alias_4(ptr noalias %dst) {
111; CHECK-LABEL: @test_lifetime_partial_alias_4(
112; CHECK-NEXT:    [[A:%.*]] = alloca [16 x i8], align 1
113; CHECK-NEXT:    call void @llvm.lifetime.start.p0(i64 12, ptr [[A]])
114; CHECK-NEXT:    [[GEP:%.*]] = getelementptr i8, ptr [[A]], i64 8
115; CHECK-NEXT:    call void @llvm.memcpy.p0.p0.i64(ptr [[DST:%.*]], ptr [[GEP]], i64 8, i1 false)
116; CHECK-NEXT:    ret void
117;
118  %a = alloca [16 x i8]
119  call void @llvm.lifetime.start.p0(i64 12, ptr %a)
120  %gep = getelementptr i8, ptr %a, i64 8
121  call void @llvm.memcpy.p0.p0.i64(ptr %dst, ptr %gep, i64 8, i1 false)
122  ret void
123}
124
125declare void @llvm.memcpy.p0.p0.i64(ptr nocapture, ptr nocapture, i64, i1) nounwind
126
127declare void @llvm.lifetime.start.p0(i64, ptr nocapture) nounwind
128