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[patch] Use a std::vector instead of a std::map to hold Input_merge_map
- From: Rafael EspÃndola <rafael dot espindola at gmail dot com>
- To: Binutils <binutils at sourceware dot org>
- Cc: Cary Coutant <ccoutant at gmail dot com>, Sriraman Tallam <tmsriram at google dot com>
- Date: Thu, 23 Apr 2015 12:36:06 -0400
- Subject: [patch] Use a std::vector instead of a std::map to hold Input_merge_map
- Authentication-results: sourceware.org; auth=none
A std::map is hardly the best data structure for a small map from
small integers.
The attached patch uses a std::vector<std::pair>> instead.
This simplifies the code and speeds up linking of chromium (see
attached perf logs).
Cheers,
Rafael
2015-04-23 Rafael Ãvila de EspÃndola <rafael.espindola@gmail.com>
* merge.cc (get_input_merge_map): Update for data structure change.
(get_or_make_input_merge_map): Update for data structure change.
* merge.h (Object_merge_map): Use a std::vector<std::pair>> instead of
a std::map.
Performance counter stats for '/home/espindola/binutils/ld-master -pie --hash-style=gnu --no-add-needed --build-id --gc-sections --eh-frame-hdr -m elf_x86_64 -dynamic-linker /lib64/ld-linux-x86-64.so.2 -o chrome /usr/lib/gcc/x86_64-redhat-linux/4.9.2/../../../../lib64/Scrt1.o /usr/lib/gcc/x86_64-redhat-linux/4.9.2/../../../../lib64/crti.o /usr/lib/gcc/x86_64-redhat-linux/4.9.2/crtbeginS.o -L. -L/usr/lib/gcc/x86_64-redhat-linux/4.9.2 -L/usr/lib/gcc/x86_64-redhat-linux/4.9.2/../../../../lib64 -L/lib/../lib64 -L/usr/lib/../lib64 -L/usr/lib/gcc/x86_64-redhat-linux/4.9.2/../../.. -L/home/espindola/llvm/build-227431/bin/../lib -L/lib -L/usr/lib -z now -z relro --fatal-warnings -z defs -z noexecstack --disable-new-dtags --export-dynamic -uIsHeapProfilerRunning -uProfilerStart -u_Z21InitialMallocHook_NewPKvj -u_Z22InitialMallocHook_MMapPKvS0_jiiix -u_Z22InitialMallocHook_SbrkPKvi -u_Z21InitialMallocHook_NewPKvm -u_Z22InitialMallocHook_MMapPKvS0_miiil -u_Z22InitialMallocHook_SbrkPKvl 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/usr/lib/gcc/x86_64-redhat-linux/4.9.2/crtendS.o /usr/lib/gcc/x86_64-redhat-linux/4.9.2/../../../../lib64/crtn.o' (30 runs):
6340.420328 task-clock (msec) # 0.999 CPUs utilized ( +- 0.24% )
3 context-switches # 0.000 K/sec ( +- 5.87% )
0 cpu-migrations # 0.000 K/sec
266,965 page-faults # 0.042 M/sec
19,423,623,904 cycles # 3.063 GHz ( +- 0.05% )
8,996,119,541 stalled-cycles-frontend # 46.32% frontend cycles idle ( +- 0.10% )
0 stalled-cycles-backend # 0.00% backend cycles idle
27,933,514,202 instructions # 1.44 insns per cycle
# 0.32 stalled cycles per insn ( +- 0.00% )
5,536,085,050 branches # 873.142 M/sec ( +- 0.00% )
81,208,891 branch-misses # 1.47% of all branches ( +- 0.00% )
6.344845173 seconds time elapsed ( +- 0.24% )
Performance counter stats for '/home/espindola/binutils/ld-patch2 -pie --hash-style=gnu --no-add-needed --build-id --gc-sections --eh-frame-hdr -m elf_x86_64 -dynamic-linker /lib64/ld-linux-x86-64.so.2 -o chrome /usr/lib/gcc/x86_64-redhat-linux/4.9.2/../../../../lib64/Scrt1.o /usr/lib/gcc/x86_64-redhat-linux/4.9.2/../../../../lib64/crti.o /usr/lib/gcc/x86_64-redhat-linux/4.9.2/crtbeginS.o -L. -L/usr/lib/gcc/x86_64-redhat-linux/4.9.2 -L/usr/lib/gcc/x86_64-redhat-linux/4.9.2/../../../../lib64 -L/lib/../lib64 -L/usr/lib/../lib64 -L/usr/lib/gcc/x86_64-redhat-linux/4.9.2/../../.. -L/home/espindola/llvm/build-227431/bin/../lib -L/lib -L/usr/lib -z now -z relro --fatal-warnings -z defs -z noexecstack --disable-new-dtags --export-dynamic -uIsHeapProfilerRunning -uProfilerStart -u_Z21InitialMallocHook_NewPKvj -u_Z22InitialMallocHook_MMapPKvS0_jiiix -u_Z22InitialMallocHook_SbrkPKvi -u_Z21InitialMallocHook_NewPKvm -u_Z22InitialMallocHook_MMapPKvS0_miiil -u_Z22InitialMallocHook_SbrkPKvl 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obj/native_client/src/trusted/validator_x86/libnccopy_x86_64.a obj/native_client/src/trusted/service_runtime/libnacl_signal.a obj/chrome/libsafe_browsing_chunk_proto.a obj/chrome/libsafe_browsing_report_proto.a obj/ash/libash_with_content.a obj/components/libconstrained_window.a obj/components/libweb_modal.a obj/extensions/components/libnative_app_window.a obj/extensions/libextensions_browser.a obj/components/libcopresence_endpoints.a obj/components/libkeyed_service_content.a obj/components/libuser_prefs.a obj/components/libsessions_content.a obj/components/libstorage_monitor.a obj/device/media_transfer_protocol/libdevice_media_transfer_protocol.a obj/device/media_transfer_protocol/libmtp_file_entry_proto.a obj/device/media_transfer_protocol/libmtp_storage_info_proto.a obj/components/libweb_cache_browser.a obj/components/libweb_cache_common.a obj/device/serial/libdevice_serial.a obj/extensions/browser/api/libextensions_api_registration.a obj/extensions/common/api/libcast_channel_proto.a obj/chrome/browser/ui/libgtk2ui/libgtk2ui.a obj/third_party/libaddressinput/libaddressinput.a obj/third_party/libaddressinput/libaddressinput_util.a obj/chrome/libbrowser_extensions.a obj/chrome/browser/extensions/api/libchrome_api_registration.a obj/components/libcopresence_proto.a obj/components/libcopresence.a obj/components/libproximity_auth.a obj/device/hid/libdevice_hid.a obj/device/core/libdevice_core.a obj/third_party/hunspell/libhunspell.a obj/extensions/components/libjavascript_dialog_extensions_client.a obj/chrome/libprobe_message_proto.a obj/components/libautofill_core_browser.a obj/third_party/fips181/libfips181.a obj/third_party/libphonenumber/libphonenumber.a obj/third_party/libphonenumber/libphonenumber_without_metadata.a obj/components/libinfobars_core.a obj/components/libbookmarks_browser.a obj/components/libfavicon_base.a obj/components/libquery_parser.a obj/components/libcaptive_portal.a obj/components/libdata_reduction_proxy_core_browser.a obj/components/libdata_reduction_proxy_core_common.a obj/components/libdomain_reliability.a obj/components/libenhanced_bookmarks.a obj/components/libenhanced_bookmarks_proto.a obj/components/libfavicon_core.a obj/components/libfeedback_component.a obj/components/libgoogle_core_browser.a obj/components/liburl_fixer.a obj/components/libhistory_core_browser.a obj/components/libhistory_core_common.a obj/components/libmetrics_gpu.a obj/components/libmetrics_net.a obj/components/libmetrics_profiler.a obj/components/libnavigation_metrics.a obj/components/libnetwork_time.a obj/components/libomnibox.a obj/components/libsearch.a obj/components/libsearch_engines.a obj/components/librappor.a obj/components/search_engines/libprepopulated_engines.a obj/components/libvariations_http_provider.a obj/components/libpolicy_component_browser.a obj/components/libprecache_core.a obj/components/libprecache_core_proto.a obj/components/librenderer_context_menu.a obj/components/libsearch_provider_logos.a obj/components/libsuggestions.a obj/components/libsync_driver.a obj/components/libtranslate_core_browser.a obj/components/liblanguage_usage_metrics.a obj/components/libwebdata_services.a obj/chrome/libapps.a obj/components/libautofill_content_browser.a obj/components/libdom_distiller_content.a obj/components/libhistory_content_browser.a obj/components/libnavigation_interception.a obj/components/libpacked_ct_ev_whitelist.a obj/components/libpassword_manager_content_browser.a obj/components/libpower.a obj/components/libprecache_content.a obj/components/libtranslate_content_browser.a obj/components/libvisitedlink_browser.a obj/components/libweb_resource.a obj/net/libnet_extras.a obj/testing/perf/libperf_test.a obj/chrome/libsync_file_system_drive_proto.a obj/components/libcryptauth.a obj/components/libcryptauth_proto.a obj/components/libnacl_browser.a obj/chrome/libpolicy_path_parser.a obj/components/libpdf_browser.a obj/components/libpdf_common.a obj/chrome/libsafe_browsing_metadata_proto.a obj/build/linux/libspeechd.a obj/components/libbreakpad_host.a obj/components/libcrash_component.a obj/components/libcrash_component_lib.a obj/breakpad/libbreakpad_client.a obj/components/libautofill_content_renderer.a obj/components/libcdm_renderer.a obj/components/libcdm_common.a obj/components/libnetwork_hints_renderer.a obj/components/liberror_page_renderer.a obj/components/libpassword_manager_content_renderer.a obj/components/libplugins_renderer.a obj/components/libtranslate_content_renderer.a obj/components/libvisitedlink_renderer.a obj/components/libweb_cache_renderer.a obj/components/libnacl.a obj/mojo/libmonacl_syscall.a obj/components/libnacl_renderer.a obj/native_client/src/trusted/nonnacl_util/libsel_ldr_launcher_base.a obj/native_client/src/shared/serialization/libserialization.a obj/ppapi/libppapi_cpp_objects.a obj/ppapi/libppapi_internal_module.a obj/third_party/jsoncpp/libjsoncpp.a obj/components/libpdf_renderer.a obj/third_party/smhasher/libmurmurhash3.a obj/extensions/libextensions_renderer.a obj/media/cast/libcast_sender.a obj/components/libprinting_renderer.a obj/extensions/libextensions_utility.a obj/third_party/cld_2/libcld2_static.a obj/remoting/libremoting_base.a obj/remoting/proto/libchromotocol_proto_lib.a obj/remoting/libremoting_client.a obj/remoting/libremoting_protocol.a --end-group -lrt -ldl -lgmodule-2.0 -lgobject-2.0 -lgthread-2.0 -lglib-2.0 -lsmime3 -lnss3 -lnssutil3 -lplds4 -lplc4 -lnspr4 -lpthread -lgconf-2 -lgio-2.0 -lresolv -lfontconfig -lfreetype -lpangocairo-1.0 -lcairo -lpangoft2-1.0 -lpango-1.0 -lharfbuzz -lX11 -lXi -lXcursor -lXext -lXfixes -lXrender -lXss -lXcomposite -lasound -lm -lXdamage -lXtst -lXrandr -lexpat -lcups -lgssapi_krb5 -lkrb5 -lk5crypto -lcom_err -lz -lcrypt -ldbus-1 -lcap -lgtk-x11-2.0 -lgdk-x11-2.0 -latk-1.0 -lgdk_pixbuf-2.0 -lstdc++ -lm -lgcc_s -lgcc -lpthread -lc -lgcc_s -lgcc /usr/lib/gcc/x86_64-redhat-linux/4.9.2/crtendS.o /usr/lib/gcc/x86_64-redhat-linux/4.9.2/../../../../lib64/crtn.o' (30 runs):
6265.451471 task-clock (msec) # 0.999 CPUs utilized ( +- 0.31% )
3 context-switches # 0.000 K/sec ( +- 5.65% )
0 cpu-migrations # 0.000 K/sec ( +- 59.45% )
266,965 page-faults # 0.043 M/sec
19,264,462,653 cycles # 3.075 GHz ( +- 0.06% )
8,994,737,627 stalled-cycles-frontend # 46.69% frontend cycles idle ( +- 0.13% )
0 stalled-cycles-backend # 0.00% backend cycles idle
27,938,050,652 instructions # 1.45 insns per cycle
# 0.32 stalled cycles per insn ( +- 0.00% )
5,541,198,567 branches # 884.405 M/sec ( +- 0.00% )
80,496,503 branch-misses # 1.45% of all branches ( +- 0.00% )
6.269855088 seconds time elapsed ( +- 0.31% )
diff --git a/gold/merge.cc b/gold/merge.cc
index d395312..7e061af 100644
--- a/gold/merge.cc
+++ b/gold/merge.cc
@@ -49,13 +49,12 @@ const Object_merge_map::Input_merge_map*
Object_merge_map::get_input_merge_map(unsigned int shndx) const
{
gold_assert(shndx != -1U);
- if (shndx == this->first_shnum_)
- return &this->first_map_;
- if (shndx == this->second_shnum_)
- return &this->second_map_;
- Section_merge_maps::const_iterator p = this->section_merge_maps_.find(shndx);
- if (p != this->section_merge_maps_.end())
- return p->second;
+ const Section_merge_maps &maps = this->section_merge_maps_;
+ for (Section_merge_maps::const_iterator i = maps.begin(), e =maps.end();
+ i != e; ++i) {
+ if (i->first == shndx)
+ return i->second;
+ }
return NULL;
}
@@ -73,23 +72,10 @@ Object_merge_map::get_or_make_input_merge_map(
return map;
}
- // We need to create a new entry.
- if (this->first_shnum_ == -1U)
- {
- this->first_shnum_ = shndx;
- this->first_map_.output_data = output_data;
- return &this->first_map_;
- }
- if (this->second_shnum_ == -1U)
- {
- this->second_shnum_ = shndx;
- this->second_map_.output_data = output_data;
- return &this->second_map_;
- }
-
Input_merge_map* new_map = new Input_merge_map;
new_map->output_data = output_data;
- this->section_merge_maps_[shndx] = new_map;
+ Section_merge_maps &maps = this->section_merge_maps_;
+ maps.push_back(std::make_pair(shndx, new_map));
return new_map;
}
diff --git a/gold/merge.h b/gold/merge.h
index 54caed8..53846ee 100644
--- a/gold/merge.h
+++ b/gold/merge.h
@@ -42,9 +42,7 @@ class Object_merge_map
{
public:
Object_merge_map()
- : first_shnum_(-1U), first_map_(),
- second_shnum_(-1U), second_map_(),
- section_merge_maps_()
+ : section_merge_maps_()
{ }
~Object_merge_map();
@@ -152,7 +150,8 @@ class Object_merge_map
};
// Map input section indices to merge maps.
- typedef std::map<unsigned int, Input_merge_map*> Section_merge_maps;
+ typedef std::vector<std::pair<unsigned int, Input_merge_map*> >
+ Section_merge_maps;
// Return a pointer to the Input_merge_map to use for the input
// section SHNDX, or NULL.
@@ -165,15 +164,6 @@ class Object_merge_map
this)->get_input_merge_map(shndx));
}
- // Any given object file will normally only have a couple of input
- // sections with mergeable contents. So we keep the first two input
- // section numbers inline, and push any further ones into a map. A
- // value of -1U in first_shnum_ or second_shnum_ means that we don't
- // have a corresponding entry.
- unsigned int first_shnum_;
- Input_merge_map first_map_;
- unsigned int second_shnum_;
- Input_merge_map second_map_;
Section_merge_maps section_merge_maps_;
};