| ; RUN: llc -verify-machineinstrs -mcpu=pwr7 -O0 -fast-isel=false < %s | FileCheck %s |
| |
| ; This tests correct handling of empty aggregate parameters and return values. |
| ; An empty parameter passed by value does not consume a protocol register or |
| ; a parameter save area doubleword. An empty parameter passed by reference |
| ; is treated as any other pointer parameter. An empty aggregate return value |
| ; is treated as any other aggregate return value, passed via address as a |
| ; hidden parameter in GPR3. In this example, GPR3 contains the return value |
| ; address, GPR4 contains the address of e2, and e1 and e3 are not passed or |
| ; received. |
| |
| 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" |
| target triple = "powerpc64-unknown-linux-gnu" |
| |
| %struct.empty = type {} |
| |
| define void @callee(ptr noalias sret(%struct.empty) %agg.result, ptr byval(%struct.empty) %a1, ptr %a2, ptr byval(%struct.empty) %a3) nounwind { |
| entry: |
| %a2.addr = alloca ptr, align 8 |
| store ptr %a2, ptr %a2.addr, align 8 |
| %0 = load ptr, ptr %a2.addr, align 8 |
| call void @llvm.memcpy.p0.p0.i64(ptr %agg.result, ptr %0, i64 0, i1 false) |
| ret void |
| } |
| |
| ; CHECK-LABEL: callee: |
| ; CHECK: std 4, |
| ; CHECK-NOT: std 5, |
| ; CHECK-NOT: std 6, |
| ; CHECK: blr |
| |
| declare void @llvm.memcpy.p0.p0.i64(ptr nocapture, ptr nocapture, i64, i1) nounwind |
| |
| define void @caller(ptr noalias sret(%struct.empty) %agg.result) nounwind { |
| entry: |
| %e1 = alloca %struct.empty, align 1 |
| %e2 = alloca %struct.empty, align 1 |
| %e3 = alloca %struct.empty, align 1 |
| call void @callee(ptr sret(%struct.empty) %agg.result, ptr byval(%struct.empty) %e1, ptr %e2, ptr byval(%struct.empty) %e3) |
| ret void |
| } |
| |
| ; CHECK-LABEL: caller: |
| ; CHECK: addi 4, |
| ; CHECK-NOT: std 5, |
| ; CHECK-NOT: std 6, |
| ; CHECK: bl callee |
