1; RUN: opt -instcombine -S < %s | FileCheck %s 2; 3; Verify that instcombine preserves TBAA tags when converting a memcpy into 4; a scalar load and store. 5 6target 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" 7 8declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i1) nounwind 9 10%A = type { float } 11 12define void @test1(%A* %a1, %A* %a2) { 13entry: 14; CHECK-LABEL: @test1 15; CHECK: %[[LOAD:.*]] = load i32, {{.*}}, !tbaa [[TAG_A:!.*]] 16; CHECK: store i32 %[[LOAD]], {{.*}}, !tbaa [[TAG_A]] 17; CHECK: ret 18 %0 = bitcast %A* %a1 to i8* 19 %1 = bitcast %A* %a2 to i8* 20 tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 4 %0, i8* align 4 %1, i64 4, i1 false), !tbaa !4 ; TAG_A 21 ret void 22} 23 24%B = 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 %B, align 8 31 %tmp1 = bitcast %B* %tmp to i8* 32 call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 8 %tmp1, i8* align 8 undef, i64 8, i1 false), !tbaa !7 ; TAG_B 33 %tmp2 = getelementptr %B, %B* %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!0 = !{!"root"} 39!1 = !{!0, !"char"} 40!2 = !{!1, !"float"} 41!3 = !{!1, i64 4, !"A", !2, i64 0, i64 4} 42!4 = !{!3, !3, i64 0, i64 4} 43!5 = !{!1, !"pointer"} 44!6 = !{!1, i64 8, !"B", !5, i64 0, i64 8} 45!7 = !{!6, !6, i64 0, i64 8} 46 47; CHECK-DAG: [[ROOT:!.*]] = !{!"root"} 48; CHECK-DAG: [[TYPE_char:!.*]] = !{[[ROOT]], !"char"} 49; CHECK-DAG: [[TYPE_float:!.*]] = !{[[TYPE_char]], !"float"} 50; CHECK-DAG: [[TYPE_A:!.*]] = !{[[TYPE_char]], i64 4, !"A", [[TYPE_float]], i64 0, i64 4} 51; CHECK-DAG: [[TAG_A]] = !{[[TYPE_A]], [[TYPE_A]], i64 0, i64 4} 52; Note that the memcpy() call in test2() transforms into an 53; undecorated 'store undef', so TAG_B is not present in the output. 54