RFR: 8345265: Minor improvements for LTO across all compilers [v2]

[Matthias Baesken]

On Thu, 27 Mar 2025 14:16:38 GMT, Julian Waters <jwaters at openjdk.org> wrote:

> Wait, sorry to trouble you further, but what does nm --demangle --reverse-sort --print-size --size-sort libjvm.so on HotSpot compiled by gcc 14 with LTO active yield as the largest symbol in the binary? (It should be the symbol listed at the very top)


This is my output; maybe I have to add I used the 'normal' jdk head without patches, is that what I should do for a gcc14 build test?


nm --demangle --reverse-sort --print-size --size-sort images/jdk/lib/server/libjvm.so   | more
0000000000453ee0 000000000002320e t State::MachNodeGenerator(int)
0000000000970f70 0000000000018eb9 t CompilerToVM::initialize_intrinsics(JVMCIEnv*)
000000000140caa0 000000000000f018 b Matcher::mreg2regmask
0000000000993c80 000000000000a40d t JNIJVMCI::initialize_ids(JNIEnv_*)
0000000000ac16b0 0000000000009d16 t Matcher::Fixup_Save_On_Entry()
000000000143db00 0000000000008000 b _ZL9_elements.lto_priv.0
0000000001446d20 0000000000008000 b _free_list
000000000141e900 0000000000007d00 b DFSClosure::_reference_stack
00000000013d6d40 0000000000007668 d _ZL9flagTable.lto_priv.0
00000000013edf60 0000000000006c30 d VMStructs::localHotSpotVMStructs
00000000010463f0 0000000000006a06 t readConfiguration0(JNIEnv_*, JVMCIEnv*) [clone .isra.0]
0000000000d51dc0 00000000000067a2 t StubGenerator::generate_libmPow()
00000000010b12d0 0000000000006289 t G1ParScanThreadState::trim_queue_to_threshold(unsigned int)
0000000000e24550 00000000000061e8 t ClassVerifier::verify_method(methodHandle const&, JavaThread*)
0000000001076dd0 000000000000548d t State::DFA(int, Node const*) [clone .isra.0]
0000000000e1ba00 000000000000519d t VMError::report(outputStream*, bool)
00000000014521e0 0000000000005000 b TemplateInterpreter::_safept_table
000000000142cb60 0000000000005000 b TemplateInterpreter::_normal_table
0000000001431b60 0000000000005000 b TemplateInterpreter::_active_table
0000000000653790 0000000000004e12 t CompileBroker::print_heapinfo(outputStream*, char const*, unsigned long)
000000000075be40 0000000000004e0b t G1CollectedHeap::do_collection_pause_at_safepoint_helper()
0000000000b90260 0000000000004a41 t Parse::do_one_bytecode() [clone .part.0]
00000000010c1f20 00000000000049e6 t d_print_comp_inner
0000000000c1e180 0000000000004594 t ServiceThread::service_thread_entry(JavaThread*, JavaThread*)
00000000005ad7c0 0000000000004424 t C2Compiler::compile_method(ciEnv*, ciMethod*, int, bool, DirectiveSet*)
0000000000d260b0 000000000000440a t PhaseStringOpts::replace_string_concat(StringConcat*)
0000000000e48920 00000000000042e5 t VM_Version::initialize()
0000000000afbad0 0000000000004240 t Method::init_intrinsic_id(vmSymbolID)
00000000010200d0 00000000000040ab t PSParallelCompact::invoke_no_policy(bool) [clone .isra.0]
000000000051f230 0000000000004054 t Compiler::compile_method(ciEnv*, ciMethod*, int, bool, DirectiveSet*)
000000000065c060 0000000000004015 t Compile::Code_Gen()
0000000000663060 0000000000003fec t CompileBroker::compiler_thread_loop()
000000000070d9b0 0000000000003fd7 t ConnectionGraph::do_analysis(Compile*, PhaseIterGVN*)
0000000000be8890 0000000000003f8e t PhaseChaitin::Split(unsigned int, ResourceArea*)
0000000000818730 0000000000003f82 t PhaseChaitin::build_ifg_physical(ResourceArea*)
0000000000fb1920 0000000000003f44 t SharedRuntime::generate_native_wrapper(MacroAssembler*, methodHandle const&, int, BasicType*, VMRegPair*, BasicType) [clone .constprop.0]
00000000007e2ab0 0000000000003f41 t PhaseCFG::global_code_motion()
00000000013e8580 0000000000003e10 d JVMCIVMStructs::localHotSpotVMStructs
0000000000db3b00 0000000000003dff t TemplateInterpreterGenerator::generate_all()
0000000000f436d0 0000000000003d92 t initialize_stubs(StubGenBlobId, int, int, char const*, char const*, char const*) [clone .constprop.0]
0000000000d6b680 0000000000003d42 t StubGenerator::generate_libmTan()
00000000004ff560 0000000000003d28 t BCEscapeAnalyzer::iterate_blocks(Arena*)
0000000000a2bfb0 0000000000003cef t VM_RedefineClasses::load_new_class_versions() [clone .part.0]
000000000073fde0 0000000000003ca2 t G1CollectedHeap::do_full_collection(bool, bool)
0000000000e8e170 0000000000003bea t ZDriverMajor::run_thread()
000000000103ec00 0000000000003b81 t JvmtiEnv::RetransformClasses(int, _jclass* const*) [clone .isra.0]
0000000000d18c50 0000000000003b4d t StubGenerator::generate_md5_implCompress(StubGenStubId)
0000000000a97160 0000000000003b20 t PhaseIdealLoop::auto_vectorize(IdealLoopTree*, VSharedData&) [clone .part.0]
00000000013df000 0000000000003aa8 d ruleName
00000000005c7e90 0000000000003a9f t PhiNode::Ideal(PhaseGVN*, bool)
00000000006a1ef0 0000000000003a9f t State::_sub_Op_AddP(Node const*)
0000000000e86880 0000000000003a74 t ZGeneration::select_relocation_set(ZGenerationId, bool)
--More--

-------------

PR Comment: https://git.openjdk.org/jdk/pull/22464#issuecomment-2758282021