https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77472
Markus Trippelsdorf <trippels at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |compile-time-hog, lto,
| |memory-hog
Status|UNCONFIRMED |NEW
Last reconfirmed| |2016-09-04
CC| |trippels at gcc dot gnu.org
Component|lto |ipa
Ever confirmed|0 |1
--- Comment #1 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
Confirmed.
gcc spends ages in ipa inline analysis at WPA time (~4GB used):
Overhead Shared Object Symbol
41.71% lto1 [.] estimate_calls_size_and_time
22.29% lto1 [.] update_callee_keys
then at LTRANS time:
Overhead Shared Object Symbol
72.35% lto1 [.] get_abnormal_succ_dispatcher
2.11% lto1 [.] htab_find_slot_with_hash
more and more memory gets used.
(Clang -flto manages with under 400KB)
Will try to come up with a testcase tomorrow.
