; RUN: opt -passes=dse -S < %s | FileCheck %s target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" target triple = "x86_64-unknown-linux-gnu" %class.basic_string = type { %"class.__gnu_cxx::__versa_string" } %"class.__gnu_cxx::__versa_string" = type { %"class.__gnu_cxx::__sso_string_base" } %"class.__gnu_cxx::__sso_string_base" = type { %"struct.__gnu_cxx::__vstring_utility, std::allocator >::_Alloc_hider", i64, %union.anon } %"struct.__gnu_cxx::__vstring_utility, std::allocator >::_Alloc_hider" = type { ptr } %union.anon = type { i64, [8 x i8] } ; Function Attrs: nounwind declare void @llvm.memset.p0.i64(ptr nocapture, i8, i64, i1) #0 ; Function Attrs: noinline nounwind readonly uwtable declare zeroext i1 @callee_takes_string(ptr nonnull) #1 align 2 ; Function Attrs: nounwind uwtable define weak_odr zeroext i1 @test() #2 align 2 { ; CHECK-LABEL: @test bb: %tmp = alloca %class.basic_string, align 8 %tmp1 = alloca %class.basic_string, align 8 %tmp3 = getelementptr inbounds %class.basic_string, ptr %tmp, i64 0, i32 0, i32 0, i32 2 %tmp6 = getelementptr inbounds %class.basic_string, ptr %tmp, i64 0, i32 0, i32 0, i32 1 %tmp7 = getelementptr inbounds i8, ptr %tmp3, i64 1 %tmp9 = bitcast i64 0 to i64 %tmp10 = getelementptr inbounds %class.basic_string, ptr %tmp1, i64 0, i32 0, i32 0, i32 2 %tmp13 = getelementptr inbounds %class.basic_string, ptr %tmp1, i64 0, i32 0, i32 0, i32 1 %tmp14 = getelementptr inbounds i8, ptr %tmp10, i64 1 br label %_ZN12basic_stringIcSt11char_traitsIcESaIcEEC2EPKcRKS2_.exit _ZN12basic_stringIcSt11char_traitsIcESaIcEEC2EPKcRKS2_.exit: ; preds = %bb store ptr %tmp3, ptr %tmp, align 8 store i8 62, ptr %tmp3, align 8 store i64 1, ptr %tmp6, align 8 store i8 0, ptr %tmp7, align 1 %tmp16 = call zeroext i1 @callee_takes_string(ptr nonnull %tmp) br label %_ZN9__gnu_cxx17__sso_string_baseIcSt11char_traitsIcESaIcEED2Ev.exit3 _ZN9__gnu_cxx17__sso_string_baseIcSt11char_traitsIcESaIcEED2Ev.exit3: ; preds = %_ZN12basic_stringIcSt11char_traitsIcESaIcEEC2EPKcRKS2_.exit ; CHECK: _ZN9__gnu_cxx17__sso_string_baseIcSt11char_traitsIcESaIcEED2Ev.exit3: ; The following can be read through the call %tmp17: store ptr %tmp10, ptr %tmp1, align 8 store i8 125, ptr %tmp10, align 8 store i64 1, ptr %tmp13, align 8 store i8 0, ptr %tmp14, align 1 ; CHECK: store ptr %tmp10, ptr %tmp1, align 8 ; CHECK: store i8 125, ptr %tmp10, align 8 ; CHECK: store i64 1, ptr %tmp13, align 8 ; CHECK: store i8 0, ptr %tmp14, align 1 %tmp17 = call zeroext i1 @callee_takes_string(ptr nonnull %tmp1) call void @llvm.memset.p0.i64(ptr align 8 %tmp10, i8 -51, i64 16, i1 false) #0 call void @llvm.memset.p0.i64(ptr align 8 %tmp1, i8 -51, i64 32, i1 false) #0 call void @llvm.memset.p0.i64(ptr align 8 %tmp3, i8 -51, i64 16, i1 false) #0 call void @llvm.memset.p0.i64(ptr align 8 %tmp, i8 -51, i64 32, i1 false) #0 ret i1 %tmp17 } attributes #0 = { nounwind } attributes #1 = { noinline nounwind readonly uwtable } attributes #2 = { nounwind uwtable }