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Subject: [Bug gcov-profile/90364] 521.wrf_r is 8-17% slower with PGO at
 -Ofast and native march/mtune
Date: Wed, 13 Oct 2021 13:27:23 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D90364

--- Comment #12 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Martin Liska <marxin@gcc.gnu.org>:

https://gcc.gnu.org/g:72e0c742bd01f8e7e6dcca64042b9ad7e75979de

commit r12-4372-g72e0c742bd01f8e7e6dcca64042b9ad7e75979de
Author: Martin Liska <mliska@suse.cz>
Date:   Thu Sep 9 13:02:24 2021 +0200

    gcov: make profile merging smarter

    Support merging of profiles that are built from a different .o files
    but belong to the same source file. Moreover, a checksum is verified
    during profile merging and so we can safely combine such profile.

            PR gcov-profile/90364

    gcc/ChangeLog:

            * coverage.c (build_info): Emit checksum to the global variable.
            (build_info_type): Add new field for checksum.
            (coverage_obj_finish): Pass object_checksum.
            (coverage_init): Use 0 as checksum for .gcno files.
            * gcov-dump.c (dump_gcov_file): Dump also new checksum field.
            * gcov.c (read_graph_file): Read also checksum.
            * doc/invoke.texi: Document the behaviour change.

    libgcc/ChangeLog:

            * libgcov-driver.c (merge_one_data): Skip timestamp and verify
            checksums.
            (write_one_data): Write also checksum.
            * libgcov-util.c (read_gcda_file): Read also checksum field.
            * libgcov.h (struct gcov_info): Add new field.=