50 lines
2.0 KiB
LLVM
50 lines
2.0 KiB
LLVM
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; RUN: llc -verify-machineinstrs -mcpu=pwr7 -O0 -fast-isel=false < %s | FileCheck %s
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; This tests correct handling of empty aggregate parameters and return values.
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; An empty parameter passed by value does not consume a protocol register or
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; a parameter save area doubleword. An empty parameter passed by reference
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; is treated as any other pointer parameter. An empty aggregate return value
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; is treated as any other aggregate return value, passed via address as a
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; hidden parameter in GPR3. In this example, GPR3 contains the return value
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; address, GPR4 contains the address of e2, and e1 and e3 are not passed or
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; received.
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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"
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target triple = "powerpc64-unknown-linux-gnu"
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%struct.empty = type {}
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define void @callee(%struct.empty* noalias sret(%struct.empty) %agg.result, %struct.empty* byval(%struct.empty) %a1, %struct.empty* %a2, %struct.empty* byval(%struct.empty) %a3) nounwind {
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entry:
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%a2.addr = alloca %struct.empty*, align 8
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store %struct.empty* %a2, %struct.empty** %a2.addr, align 8
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%0 = load %struct.empty*, %struct.empty** %a2.addr, align 8
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%1 = bitcast %struct.empty* %agg.result to i8*
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%2 = bitcast %struct.empty* %0 to i8*
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call void @llvm.memcpy.p0i8.p0i8.i64(i8* %1, i8* %2, i64 0, i1 false)
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ret void
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}
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; CHECK-LABEL: callee:
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; CHECK: std 4,
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; CHECK-NOT: std 5,
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; CHECK-NOT: std 6,
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; CHECK: blr
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declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i1) nounwind
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define void @caller(%struct.empty* noalias sret(%struct.empty) %agg.result) nounwind {
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entry:
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%e1 = alloca %struct.empty, align 1
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%e2 = alloca %struct.empty, align 1
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%e3 = alloca %struct.empty, align 1
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call void @callee(%struct.empty* sret(%struct.empty) %agg.result, %struct.empty* byval(%struct.empty) %e1, %struct.empty* %e2, %struct.empty* byval(%struct.empty) %e3)
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ret void
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}
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; CHECK-LABEL: caller:
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; CHECK: addi 4,
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; CHECK-NOT: std 5,
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; CHECK-NOT: std 6,
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; CHECK: bl callee
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