1; RUN: opt -passes=dse -S < %s | FileCheck %s 2target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" 3target triple = "x86_64-unknown-linux-gnu" 4 5%class.basic_string = type { %"class.__gnu_cxx::__versa_string" } 6%"class.__gnu_cxx::__versa_string" = type { %"class.__gnu_cxx::__sso_string_base" } 7%"class.__gnu_cxx::__sso_string_base" = type { %"struct.__gnu_cxx::__vstring_utility<char, std::char_traits<char>, std::allocator<char> >::_Alloc_hider", i64, %union.anon } 8%"struct.__gnu_cxx::__vstring_utility<char, std::char_traits<char>, std::allocator<char> >::_Alloc_hider" = type { ptr } 9%union.anon = type { i64, [8 x i8] } 10 11; Function Attrs: nounwind 12declare void @llvm.memset.p0.i64(ptr nocapture, i8, i64, i1) #0 13 14; Function Attrs: noinline nounwind readonly uwtable 15declare zeroext i1 @callee_takes_string(ptr nonnull) #1 align 2 16 17; Function Attrs: nounwind uwtable 18define weak_odr zeroext i1 @test() #2 align 2 { 19 20; CHECK-LABEL: @test 21 22bb: 23 %tmp = alloca %class.basic_string, align 8 24 %tmp1 = alloca %class.basic_string, align 8 25 %tmp3 = getelementptr inbounds %class.basic_string, ptr %tmp, i64 0, i32 0, i32 0, i32 2 26 %tmp6 = getelementptr inbounds %class.basic_string, ptr %tmp, i64 0, i32 0, i32 0, i32 1 27 %tmp7 = getelementptr inbounds i8, ptr %tmp3, i64 1 28 %tmp9 = bitcast i64 0 to i64 29 %tmp10 = getelementptr inbounds %class.basic_string, ptr %tmp1, i64 0, i32 0, i32 0, i32 2 30 %tmp13 = getelementptr inbounds %class.basic_string, ptr %tmp1, i64 0, i32 0, i32 0, i32 1 31 %tmp14 = getelementptr inbounds i8, ptr %tmp10, i64 1 32 br label %_ZN12basic_stringIcSt11char_traitsIcESaIcEEC2EPKcRKS2_.exit 33 34_ZN12basic_stringIcSt11char_traitsIcESaIcEEC2EPKcRKS2_.exit: ; preds = %bb 35 store ptr %tmp3, ptr %tmp, align 8 36 store i8 62, ptr %tmp3, align 8 37 store i64 1, ptr %tmp6, align 8 38 store i8 0, ptr %tmp7, align 1 39 %tmp16 = call zeroext i1 @callee_takes_string(ptr nonnull %tmp) 40 br label %_ZN9__gnu_cxx17__sso_string_baseIcSt11char_traitsIcESaIcEED2Ev.exit3 41 42_ZN9__gnu_cxx17__sso_string_baseIcSt11char_traitsIcESaIcEED2Ev.exit3: ; preds = %_ZN12basic_stringIcSt11char_traitsIcESaIcEEC2EPKcRKS2_.exit 43 44; CHECK: _ZN9__gnu_cxx17__sso_string_baseIcSt11char_traitsIcESaIcEED2Ev.exit3: 45 46; The following can be read through the call %tmp17: 47 store ptr %tmp10, ptr %tmp1, align 8 48 store i8 125, ptr %tmp10, align 8 49 store i64 1, ptr %tmp13, align 8 50 store i8 0, ptr %tmp14, align 1 51 52; CHECK: store ptr %tmp10, ptr %tmp1, align 8 53; CHECK: store i8 125, ptr %tmp10, align 8 54; CHECK: store i64 1, ptr %tmp13, align 8 55; CHECK: store i8 0, ptr %tmp14, align 1 56 57 %tmp17 = call zeroext i1 @callee_takes_string(ptr nonnull %tmp1) 58 call void @llvm.memset.p0.i64(ptr align 8 %tmp10, i8 -51, i64 16, i1 false) #0 59 call void @llvm.memset.p0.i64(ptr align 8 %tmp1, i8 -51, i64 32, i1 false) #0 60 call void @llvm.memset.p0.i64(ptr align 8 %tmp3, i8 -51, i64 16, i1 false) #0 61 call void @llvm.memset.p0.i64(ptr align 8 %tmp, i8 -51, i64 32, i1 false) #0 62 ret i1 %tmp17 63} 64 65attributes #0 = { nounwind } 66attributes #1 = { noinline nounwind readonly uwtable } 67attributes #2 = { nounwind uwtable } 68 69