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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug gcov-profile/95348] GCC records zero functions and modules in
 the profiling data file, ICC does NOT
Date: Tue, 02 Jun 2020 08:23:22 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95348

--- Comment #23 from Martin Li=C5=A1ka <marxin at gcc dot gnu.org> ---
Created attachment 48660
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D48660&action=3Dedit
work-in-progress patch

There's patch that does not stream all zero counters for a function. The pa=
tch
only supports streaming and gcov-dump:

$ gcov-dump -l a-foo.gcda
a-foo.gcda:data:magic `gcda':version `B10e'
a-foo.gcda:stamp 1948224357
a-foo.gcda:  a1000000:   2:OBJECT_SUMMARY runs=3D1, sum_max=3D1
a-foo.gcda:  01000000:   3:FUNCTION ident=3D108032747,
lineno_checksum=3D0x2408bf36, cfg_checksum=3D0x7cb34af9
a-foo.gcda:    01a10000:   4:COUNTERS arcs 2 counts
a-foo.gcda:                   0: 1 1=20
a-foo.gcda:    01af0000:   2:COUNTERS time_profiler 1 counts
a-foo.gcda:                   0: 1=20
a-foo.gcda:  01000000:   3:FUNCTION ident=3D932535731,
lineno_checksum=3D0x74cbb94c, cfg_checksum=3D0xeb219516
a-foo.gcda:    01a10000:   4:COUNTERS arcs 2 counts (all zero)
a-foo.gcda:                   0: 0 0=20
a-foo.gcda:    01af0000:   2:COUNTERS time_profiler 1 counts (all zero)
a-foo.gcda:                   0: 0=20

Can you please test the patch and measure how much does it help for your
test-case?
Note that the FUNCTION section will be streamed (it contains 3 64-bit integ=
ers
for each fn:
ident=3D932535731, lineno_checksum=3D0x74cbb94c, cfg_checksum=3D0xeb219516)=
.=