4b76cda993
... instead of vector of pointers There's no real reason for having mapped_symtab::data be a vector of heap-allocated symtab_index_entries. symtab_index_entries is not that large, it's movable, and it's cheap to move. Making the vector hold values instead improves cache locality and eliminates many roundtrips to the heap. Using the same test as in the previous patch, against the same gdb inferior, timing improves ~13% further: ~6.0s => ~5.2s (average of 5 runs). Note that before the .gdb_index C++ifycation patch, we were at ~5.7s. We're now consistenly better than before. gdb/ChangeLog 2017-06-12 Pedro Alves <palves@redhat.com> * dwarf2read.c (mapped_symtab::data): Now a vector of symtab_index_entry instead of vector of std::unique_ptr<symtab_index_entry>. All users adjusted to check whether an element's name is NULL instead of checking whether the element itself is NULL. (find_slot): Change return type. Adjust. (hash_expand, , add_index_entry, uniquify_cu_indices) (write_hash_table): Adjust. |
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README
README for GNU development tools This directory contains various GNU compilers, assemblers, linkers, debuggers, etc., plus their support routines, definitions, and documentation. If you are receiving this as part of a GDB release, see the file gdb/README. If with a binutils release, see binutils/README; if with a libg++ release, see libg++/README, etc. That'll give you info about this package -- supported targets, how to use it, how to report bugs, etc. It is now possible to automatically configure and build a variety of tools with one command. To build all of the tools contained herein, run the ``configure'' script here, e.g.: ./configure make To install them (by default in /usr/local/bin, /usr/local/lib, etc), then do: make install (If the configure script can't determine your type of computer, give it the name as an argument, for instance ``./configure sun4''. You can use the script ``config.sub'' to test whether a name is recognized; if it is, config.sub translates it to a triplet specifying CPU, vendor, and OS.) If you have more than one compiler on your system, it is often best to explicitly set CC in the environment before running configure, and to also set CC when running make. For example (assuming sh/bash/ksh): CC=gcc ./configure make A similar example using csh: setenv CC gcc ./configure make Much of the code and documentation enclosed is copyright by the Free Software Foundation, Inc. See the file COPYING or COPYING.LIB in the various directories, for a description of the GNU General Public License terms under which you can copy the files. REPORTING BUGS: Again, see gdb/README, binutils/README, etc., for info on where and how to report problems.