https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107661
--- Comment #10 from Sergei Trofimovich <slyfox at gcc dot gnu.org> ---
I think ipa-cp adds the call edge info in wrong direction. a.cc.081i.cp snippet
around do3() param1 (our callback):
IPA lattices after all propagation:
Lattices:
...
Node: void do3(volatile int*, function_ref)/25:
...
param [1]: VARIABLE
ctxs: VARIABLE
Bits unusable (BOTTOM)
[irange] int VARYING
offset 0: callback_fn_L [scc: 3, from: 25(0.330000) 26(1.000000)]
[loc_time: 17, loc_size: 13, prop_time: 17, prop_size: 13]
callback_fn_R [scc: 4, from: 25(0.330000) 26(1.000000)]
[loc_time: 9, loc_size: 13, prop_time: 9, prop_size: 13]
...
Evaluating opportunities for void do3(volatile int*, function_ref)/25.
- considering value callback_fn_L for param #1 Expired, offset: 0
(caller_count: 2)
good_cloning_opportunity_p (time: 17, size: 13, freq_sum: 1.33,
self_scc) -> evaluation: 1739.23, threshold: 500
Creating a specialized node of void do3(volatile int*, function_ref)/25.
the new node is void do3.constprop(volatile int*, function_ref)/33.
Aggregate replacements: 1[0]=callback_fn_L
ipa-prop: Discovered an indirect call to a known target (void
do3.constprop(volatile int*, function_ref)/33 -> void callback_fn_L()/15), for
stmt _1 ();
../a.cc:37:19: optimized: converting indirect call in void
do3.constprop(volatile int*, function_ref)/33 to direct call to void
callback_fn_L()/15
Evaluating opportunities for void do3(volatile int*, function_ref)/25.
- adding an extra caller void do3(volatile int*, function_ref)/25 of void
do3.constprop(volatile int*, function_ref)/33
Note: the uncloned do3() is a self-recursive function. I would expect cloned
do3.constprop() to refer to uncloned do3().
If I read "adding an extra caller" correctly it adds an edge in wrong
direction: do3() now calls do3.constptop().
