1; RUN: llc -mcpu=pwr7 -O0 -fast-isel=false < %s | FileCheck %s
2
3; This tests correct handling of empty aggregate parameters and return values.
4; An empty parameter passed by value does not consume a protocol register or
5; a parameter save area doubleword.  An empty parameter passed by reference
6; is treated as any other pointer parameter.  An empty aggregate return value
7; is treated as any other aggregate return value, passed via address as a
8; hidden parameter in GPR3.  In this example, GPR3 contains the return value
9; address, GPR4 contains the address of e2, and e1 and e3 are not passed or
10; received.
11
12target 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-f128:128:128-v128:128:128-n32:64"
13target triple = "powerpc64-unknown-linux-gnu"
14
15%struct.empty = type {}
16
17define void @callee(%struct.empty* noalias sret %agg.result, %struct.empty* byval %a1, %struct.empty* %a2, %struct.empty* byval %a3) nounwind {
18entry:
19  %a2.addr = alloca %struct.empty*, align 8
20  store %struct.empty* %a2, %struct.empty** %a2.addr, align 8
21  %0 = load %struct.empty*, %struct.empty** %a2.addr, align 8
22  %1 = bitcast %struct.empty* %agg.result to i8*
23  %2 = bitcast %struct.empty* %0 to i8*
24  call void @llvm.memcpy.p0i8.p0i8.i64(i8* %1, i8* %2, i64 0, i32 1, i1 false)
25  ret void
26}
27
28; CHECK-LABEL: callee:
29; CHECK: std 4,
30; CHECK-NOT: std 5,
31; CHECK-NOT: std 6,
32; CHECK: blr
33
34declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i32, i1) nounwind
35
36define void @caller(%struct.empty* noalias sret %agg.result) nounwind {
37entry:
38  %e1 = alloca %struct.empty, align 1
39  %e2 = alloca %struct.empty, align 1
40  %e3 = alloca %struct.empty, align 1
41  call void @callee(%struct.empty* sret %agg.result, %struct.empty* byval %e1, %struct.empty* %e2, %struct.empty* byval %e3)
42  ret void
43}
44
45; CHECK-LABEL: caller:
46; CHECK: addi 4,
47; CHECK-NOT: std 5,
48; CHECK-NOT: std 6,
49; CHECK: bl callee
50