1; RUN: llc -O2 < %s | FileCheck %s 2 3target triple = "powerpc64le-linux-gnu" 4 5%class.basic_string.11.42.73 = type { %"class.__gnu_cxx::__versa_string.10.41.72" } 6%"class.__gnu_cxx::__versa_string.10.41.72" = type { %"class.__gnu_cxx::__sso_string_base.9.40.71" } 7%"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 } 8%"struct.__gnu_cxx::__vstring_utility<char, std::char_traits<char>, std::allocator<char> >::_Alloc_hider.7.38.69" = type { i8* } 9%union.anon.8.39.70 = type { i64, [8 x i8] } 10 11declare void @TestBaz(%class.basic_string.11.42.73* noalias sret %arg) 12 13define void @TestBar(%class.basic_string.11.42.73* noalias sret %arg) { 14bb: 15 call void @TestBaz(%class.basic_string.11.42.73* noalias sret %arg) 16 ret void 17} 18 19; string TestFoo() { 20; string ret = undef; 21; TestBar(&ret); // tail call optimized 22; return ret; 23; } 24define void @TestFoo(%class.basic_string.11.42.73* noalias sret %arg) { 25; CHECK-LABEL: TestFoo: 26; CHECK: #TC_RETURNd8 TestBar 0 27bb: 28 %tmp = getelementptr inbounds %class.basic_string.11.42.73, %class.basic_string.11.42.73* %arg, i64 0, i32 0, i32 0, i32 2 29 %tmp1 = bitcast %class.basic_string.11.42.73* %arg to %union.anon.8.39.70** 30 store %union.anon.8.39.70* %tmp, %union.anon.8.39.70** %tmp1, align 8 31 %tmp2 = bitcast %union.anon.8.39.70* %tmp to i8* 32 tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %tmp2, i8* nonnull undef, i64 13, i32 1, i1 false) 33 %tmp3 = getelementptr inbounds %class.basic_string.11.42.73, %class.basic_string.11.42.73* %arg, i64 0, i32 0, i32 0, i32 1 34 store i64 13, i64* %tmp3, align 8 35 %tmp4 = getelementptr inbounds %class.basic_string.11.42.73, %class.basic_string.11.42.73* %arg, i64 0, i32 0, i32 0, i32 2, i32 1, i64 5 36 store i8 0, i8* %tmp4, align 1 37 tail call void @TestBar(%class.basic_string.11.42.73* noalias sret %arg) 38 ret void 39} 40 41; Function Attrs: argmemonly nounwind 42declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture readonly, i64, i32, i1) #0 43 44attributes #0 = { argmemonly nounwind } 45