https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92394
Jan Hubicka <hubicka at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |UNCONFIRMED
Last reconfirmed|2019-11-06 00:00:00 |
Version|10.0 |unknown
Assignee|marxin at gcc dot gnu.org |unassigned at gcc dot
gnu.org
Target Milestone|10.0 |---
Ever confirmed|1 |0
--- Comment #2 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
this is statistics of reason why ICF failes:
6523 false returned: 'different tree types' in compatible_types_p at
../../gcc/ipa-icf-gimple.c:203
7521 false returned: 'parameter types are not compatible' in equals_wpa at
../../gcc/ipa-icf.c:637
12973 false returned: 'memory operands are different' in
compare_gimple_call at ../../gcc/ipa-icf-gimple.c:582
14799 false returned: 'decl_or_type flags are different' in equals_wpa at
../../gcc/ipa-icf.c:570
16052 false returned: 'inline attributes are different' in
compare_referenced_symbol_properties at ../../gcc/ipa-icf.c:344
20962 false returned: 'references to virtual tables cannot be merged' in
compare_referenced_symbol_properties at ../../gcc/ipa-icf.c:364
72431 false returned: 'call function types are not compatible' in
compare_gimple_call at ../../gcc/ipa-icf-gimple.c:566
80695 false returned: 'result types are different' in equals_wpa at
../../gcc/ipa-icf.c:619
84475 false returned: 'types are not compatible' in compatible_types_p at
../../gcc/ipa-icf-gimple.c:209
117458 false returned: '' in compare_gimple_call at
../../gcc/ipa-icf-gimple.c:545
388866 false returned: 'THIS pointer ODR type mismatch' in equals_wpa at
../../gcc/ipa-icf.c:675
391183 false returned: 'types are not same for ODR' in
compatible_polymorphic_types_p at ../../gcc/ipa-icf-gimple.c:194
618107 false returned: '' in operand_equal_p at
../../gcc/ipa-icf-gimple.c:259
2953032 false returned: 'memory operands are different' in
compare_gimple_assign at ../../gcc/ipa-icf-gimple.c:621
3083711 false returned: 'operand_equal_p failed' in compare_operand at
../../gcc/ipa-icf-gimple.c:303
3156681 false returned: '' in equals_private at ../../gcc/ipa-icf.c:885
so 2.9M functions are streamed in for memory operands being different.
Honza
