1; RUN: opt -instcombine -S < %s | FileCheck %s
2
3target 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"
4
5declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i32, i1) nounwind
6
7; Verify that instcombine preserves TBAA tags when converting a memcpy into
8; a scalar load and store.
9
10%struct.test1 = type { float }
11
12; CHECK: @test
13; CHECK: %[[LOAD:.*]] = load i32, i32* %{{.*}}, align 4, !tbaa !0
14; CHECK: store i32 %[[LOAD:.*]], i32* %{{.*}}, align 4, !tbaa !0
15; CHECK: ret
16define void @test1(%struct.test1* nocapture %a, %struct.test1* nocapture %b) {
17entry:
18  %0 = bitcast %struct.test1* %a to i8*
19  %1 = bitcast %struct.test1* %b to i8*
20  tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %0, i8* %1, i64 4, i32 4, i1 false), !tbaa.struct !3
21  ret void
22}
23
24%struct.test2 = type { i32 (i8*, i32*, double*)** }
25
26define i32 (i8*, i32*, double*)*** @test2() {
27; CHECK-LABEL: @test2(
28; CHECK-NOT: memcpy
29; CHECK: ret
30  %tmp = alloca %struct.test2, align 8
31  %tmp1 = bitcast %struct.test2* %tmp to i8*
32  call void @llvm.memcpy.p0i8.p0i8.i64(i8* %tmp1, i8* undef, i64 8, i32 8, i1 false), !tbaa.struct !4
33  %tmp2 = getelementptr %struct.test2, %struct.test2* %tmp, i32 0, i32 0
34  %tmp3 = load i32 (i8*, i32*, double*)**, i32 (i8*, i32*, double*)*** %tmp2
35  ret i32 (i8*, i32*, double*)*** %tmp2
36}
37
38; CHECK: !0 = !{!1, !1, i64 0}
39; CHECK: !1 = !{!"float", !2}
40
41!0 = !{!"Simple C/C++ TBAA"}
42!1 = !{!"omnipotent char", !0}
43!2 = !{!5, !5, i64 0}
44!3 = !{i64 0, i64 4, !2}
45!4 = !{i64 0, i64 8, null}
46!5 = !{!"float", !0}
47