1 files changed, 44 insertions, 0 deletions
diff --git a/test/Transforms/InstCombine/struct-assign-tbaa.ll b/test/Transforms/InstCombine/struct-assign-tbaa.ll
new file mode 100644
index 0000000..33a771e
--- /dev/null
+++ b/test/Transforms/InstCombine/struct-assign-tbaa.ll
@@ -0,0 +1,44 @@
+; RUN: opt -instcombine -S < %s | FileCheck %s
+
+target 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"
+
+declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i32, i1) nounwind
+
+; Verify that instcombine preserves TBAA tags when converting a memcpy into
+; a scalar load and store.
+
+%struct.test1 = type { float }
+
+; CHECK: @test
+; CHECK: %2 = load float* %0, align 4, !tbaa !0
+; CHECK: store float %2, float* %1, align 4, !tbaa !0
+; CHECK: ret
+define void @test1(%struct.test1* nocapture %a, %struct.test1* nocapture %b) {
+entry:
+  %0 = bitcast %struct.test1* %a to i8*
+  %1 = bitcast %struct.test1* %b to i8*
+  tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %0, i8* %1, i64 4, i32 4, i1 false), !tbaa.struct !3
+  ret void
+}
+
+%struct.test2 = type { i32 (i8*, i32*, double*)** }
+
+define i32 (i8*, i32*, double*)*** @test2() {
+; CHECK: @test2
+; CHECK-NOT: memcpy
+; CHECK: ret
+  %tmp = alloca %struct.test2, align 8
+  %tmp1 = bitcast %struct.test2* %tmp to i8*
+  call void @llvm.memcpy.p0i8.p0i8.i64(i8* %tmp1, i8* undef, i64 8, i32 8, i1 false), !tbaa.struct !4
+  %tmp2 = getelementptr %struct.test2* %tmp, i32 0, i32 0
+  %tmp3 = load i32 (i8*, i32*, double*)*** %tmp2
+  ret i32 (i8*, i32*, double*)*** %tmp2
+}
+
+; CHECK: !0 = metadata !{metadata !"float", metadata !1}
+
+!0 = metadata !{metadata !"Simple C/C++ TBAA"}
+!1 = metadata !{metadata !"omnipotent char", metadata !0}
+!2 = metadata !{metadata !"float", metadata !0}
+!3 = metadata !{i64 0, i64 4, metadata !2}
+!4 = metadata !{i64 0, i64 8, null}