[Bug ipa/103227] [12 Regression] 58% exchange2 regression with -Ofast -march=native on zen3 since r12-5223-gecdf414bd89e6ba251f6b3f494407139b4dbae0e

[hubicka at kam dot mff.cuni.cz]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103227

--- Comment #9 from hubicka at kam dot mff.cuni.cz ---
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103227
> ... fixing this problem properly.
> I just loked into thi again and we already have code that preserves
> propagates bits on pointer parmeters (since these do not have value
> ranges). Same way we need to preserve the known partial aggregates and
> hook it up into sccvn's vn_reference_lookup_2 and _3.

Also note that with this implemented I think we should be able to remove
the ipa-cp transformation code :)