https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93398
Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2020-01-23
Ever confirmed|0 |1
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Ok, I see the difference in the following areas:
1) sum_max is a bit different:
insn-extract.gcda: a1000000: 2:OBJECT_SUMMARY runs=1780, sum_max=867278542
insn-extract.gcda: a1000000: 2:OBJECT_SUMMARY runs=1780, sum_max=867190916
2) some arc counters are different:
cfgexpand.gcda: 01000000: 3:FUNCTION ident=79635253,
lineno_checksum=0x420a8035, cfg_checksum=0x4c361918
cfgexpand.gcda: 01a10000: 28:COUNTERS arcs 14 counts
cfgexpand.gcda: 0: 377050 12136 12136 176111 0 0 187454 0
cfgexpand.gcda: 8: 185946 0 0 0 0 377050
cfgexpand.gcda: 01000000: 3:FUNCTION ident=79635253,
lineno_checksum=0x420a8035, cfg_checksum=0x4c361918
cfgexpand.gcda: 01a10000: 28:COUNTERS arcs 14 counts
cfgexpand.gcda: 0: 377050 12136 12136 176261 0 0 186497 0
cfgexpand.gcda: 8: 186779 0 0 0 0 377050
That leads to a difference in 1)
3) time_profiler is sometimes slightly different
4) some functions have a different lineno_checksum:
tree-ssa-reassoc.gcda: 01000000: 3:FUNCTION ident=123001947,
lineno_checksum=0xb99798cf, cfg_checksum=0xa43083b8
tree-ssa-reassoc.gcda: 01000000: 3:FUNCTION ident=123001947,
lineno_checksum=0x8e05ef3c, cfg_checksum=0xa43083b8
I'll investigate that, it should not happen.
5) some ior counters are different:
c-family/c-format.gcda: 01ad0000: 4:COUNTERS ior 2 counts
c-family/c-format.gcda: 0: 140734601582032 0
c-family/c-format.gcda: 01ad0000: 4:COUNTERS ior 2 counts
c-family/c-format.gcda: 0: 140727851425584 0
These probably track some pointer alignment.
