derek.holloway
7502bf64a4
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47 lines
2.1 KiB
LLVM
47 lines
2.1 KiB
LLVM
; RUN: llc -relocation-model=static -verify-machineinstrs -O2 < %s | FileCheck %s
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; RUN: llc -relocation-model=static -verify-machineinstrs -global-isel -O2 < %s | FileCheck %s
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; The call to function TestBar should be a tail call, when in C++ the string
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; `ret` is RVO returned.
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; string TestFoo() {
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; string ret = undef;
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; TestBar(&ret); // tail call optimized
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; return ret;
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; }
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target triple = "aarch64-linux-gnu"
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%class.basic_string.11.42.73 = type { %"class.__gnu_cxx::__versa_string.10.41.72" }
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%"class.__gnu_cxx::__versa_string.10.41.72" = type { %"class.__gnu_cxx::__sso_string_base.9.40.71" }
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%"class.__gnu_cxx::__sso_string_base.9.40.71" = type { %"struct.__gnu_cxx::__vstring_utility<char, std::char_traits<char>, std::allocator<char> >::_Alloc_hider.7.38.69", i64, %union.anon.8.39.70 }
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%"struct.__gnu_cxx::__vstring_utility<char, std::char_traits<char>, std::allocator<char> >::_Alloc_hider.7.38.69" = type { ptr }
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%union.anon.8.39.70 = type { i64, [8 x i8] }
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declare void @TestBaz(ptr noalias sret(%class.basic_string.11.42.73) %arg)
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define void @TestBar(ptr noalias sret(%class.basic_string.11.42.73) %arg) {
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bb:
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call void @TestBaz(ptr noalias sret(%class.basic_string.11.42.73) %arg)
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ret void
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}
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define void @TestFoo(ptr noalias sret(%class.basic_string.11.42.73) %arg) {
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; CHECK-LABEL: TestFoo:
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; CHECK: b TestBar
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bb:
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%tmp = getelementptr inbounds %class.basic_string.11.42.73, ptr %arg, i64 0, i32 0, i32 0, i32 2
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store ptr %tmp, ptr %arg, align 8
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tail call void @llvm.memcpy.p0.p0.i64(ptr %tmp, ptr nonnull undef, i64 13, i1 false)
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%tmp3 = getelementptr inbounds %class.basic_string.11.42.73, ptr %arg, i64 0, i32 0, i32 0, i32 1
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store i64 13, ptr %tmp3, align 8
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%tmp4 = getelementptr inbounds %class.basic_string.11.42.73, ptr %arg, i64 0, i32 0, i32 0, i32 2, i32 1, i64 5
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store i8 0, ptr %tmp4, align 1
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tail call void @TestBar(ptr noalias sret(%class.basic_string.11.42.73) %arg)
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ret void
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}
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; Function Attrs: argmemonly nounwind
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declare void @llvm.memcpy.p0.p0.i64(ptr nocapture, ptr nocapture readonly, i64, i1) #0
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attributes #0 = { argmemonly nounwind }
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