| Ehsan Amiri | a538b0f | 2016-08-03 18:17:35 +0000 | [diff] [blame] | 1 | ; RUN: llc -verify-machineinstrs -mcpu=pwr7 -O0 -fast-isel=false < %s | FileCheck %s |
| Bill Schmidt | 9953cf2 | 2012-10-31 01:15:05 +0000 | [diff] [blame] | 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 | |
| 12 | 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-f128:128:128-v128:128:128-n32:64" |
| 13 | target triple = "powerpc64-unknown-linux-gnu" |
| 14 | |
| 15 | %struct.empty = type {} |
| 16 | |
| 17 | define void @callee(%struct.empty* noalias sret %agg.result, %struct.empty* byval %a1, %struct.empty* %a2, %struct.empty* byval %a3) nounwind { |
| 18 | entry: |
| 19 | %a2.addr = alloca %struct.empty*, align 8 |
| 20 | store %struct.empty* %a2, %struct.empty** %a2.addr, align 8 |
| David Blaikie | a79ac14 | 2015-02-27 21:17:42 +0000 | [diff] [blame] | 21 | %0 = load %struct.empty*, %struct.empty** %a2.addr, align 8 |
| Bill Schmidt | 9953cf2 | 2012-10-31 01:15:05 +0000 | [diff] [blame] | 22 | %1 = bitcast %struct.empty* %agg.result to i8* |
| 23 | %2 = bitcast %struct.empty* %0 to i8* |
| Daniel Neilson | 1e68724 | 2018-01-19 17:13:12 +0000 | [diff] [blame^] | 24 | call void @llvm.memcpy.p0i8.p0i8.i64(i8* %1, i8* %2, i64 0, i1 false) |
| Bill Schmidt | 9953cf2 | 2012-10-31 01:15:05 +0000 | [diff] [blame] | 25 | ret void |
| 26 | } |
| 27 | |
| Stephen Lin | d24ab20 | 2013-07-14 06:24:09 +0000 | [diff] [blame] | 28 | ; CHECK-LABEL: callee: |
| Bill Schmidt | 9953cf2 | 2012-10-31 01:15:05 +0000 | [diff] [blame] | 29 | ; CHECK: std 4, |
| Bill Schmidt | 9953cf2 | 2012-10-31 01:15:05 +0000 | [diff] [blame] | 30 | ; CHECK-NOT: std 5, |
| 31 | ; CHECK-NOT: std 6, |
| 32 | ; CHECK: blr |
| 33 | |
| Daniel Neilson | 1e68724 | 2018-01-19 17:13:12 +0000 | [diff] [blame^] | 34 | declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i1) nounwind |
| Bill Schmidt | 9953cf2 | 2012-10-31 01:15:05 +0000 | [diff] [blame] | 35 | |
| 36 | define void @caller(%struct.empty* noalias sret %agg.result) nounwind { |
| 37 | entry: |
| 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 | |
| Stephen Lin | d24ab20 | 2013-07-14 06:24:09 +0000 | [diff] [blame] | 45 | ; CHECK-LABEL: caller: |
| Bill Schmidt | 9953cf2 | 2012-10-31 01:15:05 +0000 | [diff] [blame] | 46 | ; CHECK: addi 4, |
| Bill Schmidt | 9953cf2 | 2012-10-31 01:15:05 +0000 | [diff] [blame] | 47 | ; CHECK-NOT: std 5, |
| 48 | ; CHECK-NOT: std 6, |
| 49 | ; CHECK: bl callee |