xref: /llvm-project/llvm/test/Transforms/MemCpyOpt/memcpy-in-loop.ll (revision a11faeed446882a81e79d780125d93e7199df645) 
1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2; RUN: opt -S -passes=memcpyopt < %s | FileCheck %s
3
4define void @test_copy_uninit(ptr %arg) {
5; CHECK-LABEL: @test_copy_uninit(
6; CHECK-NEXT:  start:
7; CHECK-NEXT:    [[ALLOCA:%.*]] = alloca [1000 x i32], align 4
8; CHECK-NEXT:    [[END:%.*]] = getelementptr inbounds [1000 x [1000 x i32]], ptr [[ARG:%.*]], i64 0, i64 1000
9; CHECK-NEXT:    br label [[LOOP:%.*]]
10; CHECK:       loop:
11; CHECK-NEXT:    [[CURRENT:%.*]] = phi ptr [ [[ARG]], [[START:%.*]] ], [ [[NEXT:%.*]], [[LOOP]] ]
12; CHECK-NEXT:    [[NEXT]] = getelementptr inbounds [1000 x i32], ptr [[CURRENT]], i64 1
13; CHECK-NEXT:    [[COND:%.*]] = icmp eq ptr [[NEXT]], [[END]]
14; CHECK-NEXT:    br i1 [[COND]], label [[EXIT:%.*]], label [[LOOP]]
15; CHECK:       exit:
16; CHECK-NEXT:    ret void
17;
18start:
19  %alloca = alloca [1000 x i32], align 4
20  %end = getelementptr inbounds [1000 x [1000 x i32]], ptr %arg, i64 0, i64 1000
21  br label %loop
22
23loop:                                             ; preds = %loop, %start
24  %current = phi ptr [ %arg, %start ], [ %next, %loop ]
25  call void @llvm.memcpy.p0.p0.i64(ptr nonnull align 4 dereferenceable(4000) %current, ptr nonnull align 4 dereferenceable(4000) %alloca, i64 4000, i1 false)
26  %next = getelementptr inbounds [1000 x i32], ptr %current, i64 1
27  %cond = icmp eq ptr %next, %end
28  br i1 %cond, label %exit, label %loop
29
30exit:                                             ; preds = %loop
31  ret void
32}
33
34define void @test_copy_zero(ptr %arg) {
35; CHECK-LABEL: @test_copy_zero(
36; CHECK-NEXT:  start:
37; CHECK-NEXT:    [[ALLOCA:%.*]] = alloca [1000 x i32], align 4
38; CHECK-NEXT:    call void @llvm.memset.p0.i64(ptr nonnull align 4 dereferenceable(4000) [[ALLOCA]], i8 0, i64 4000, i1 false)
39; CHECK-NEXT:    [[END:%.*]] = getelementptr inbounds [1000 x [1000 x i32]], ptr [[ARG:%.*]], i64 0, i64 1000
40; CHECK-NEXT:    br label [[LOOP:%.*]]
41; CHECK:       loop:
42; CHECK-NEXT:    [[CURRENT:%.*]] = phi ptr [ [[ARG]], [[START:%.*]] ], [ [[NEXT:%.*]], [[LOOP]] ]
43; CHECK-NEXT:    call void @llvm.memset.p0.i64(ptr align 4 [[CURRENT]], i8 0, i64 4000, i1 false)
44; CHECK-NEXT:    [[NEXT]] = getelementptr inbounds [1000 x i32], ptr [[CURRENT]], i64 1
45; CHECK-NEXT:    [[COND:%.*]] = icmp eq ptr [[NEXT]], [[END]]
46; CHECK-NEXT:    br i1 [[COND]], label [[EXIT:%.*]], label [[LOOP]]
47; CHECK:       exit:
48; CHECK-NEXT:    ret void
49;
50start:
51  %alloca = alloca [1000 x i32], align 4
52  call void @llvm.memset.p0.i64(ptr nonnull align 4 dereferenceable(4000) %alloca, i8 0, i64 4000, i1 false)
53  %end = getelementptr inbounds [1000 x [1000 x i32]], ptr %arg, i64 0, i64 1000
54  br label %loop
55
56loop:                                             ; preds = %loop, %start
57  %current = phi ptr [ %arg, %start ], [ %next, %loop ]
58  call void @llvm.memcpy.p0.p0.i64(ptr nonnull align 4 dereferenceable(4000) %current, ptr nonnull align 4 dereferenceable(4000) %alloca, i64 4000, i1 false)
59  %next = getelementptr inbounds [1000 x i32], ptr %current, i64 1
60  %cond = icmp eq ptr %next, %end
61  br i1 %cond, label %exit, label %loop
62
63exit:                                             ; preds = %loop
64  ret void
65}
66
67declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg)
68declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg)
69