https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114790
--- Comment #16 from GCC Commits ---
The master branch has been updated by Jan Hubicka :
https://gcc.gnu.org/g:52d9c2272f6366cd5b30e9540ce8ef16b482cee5
commit r16-2196-g52d9c2272f6366cd5b30e9540ce8ef16b482cee5
Author: Jan Hubicka
Date: Fri Jul 11 12:37:24 2025 +0200
Fix ICE in speculative devirtualization
This patch fixes ICE bilding lto1 with autoprofiledbootstrap and in
pr114790.
What happens is that auto-fdo speculatively devirtualizes to a wrong
target.
This is due to a bug where it mixes up dwarf names and linkage names of
inline
functions I need to fix as well.
Later we clone at WPA time. At ltrans time clone is materialized and call
is
turned into a direct call (this optimization is missed by ipa-cp
propagation).
At this time we should resolve speculation but we don't. As a result we
get
error from verifier after inlining complaining that there is speculative
call
with corresponding direct call lacking speculative flag.
This seems long-lasting problem in cgraph_update_edges_for_call_stmt_node
but
I suppose it does not trigger since we usually speculate correctly or
notice
the direct call at WPA time already.
Bootstrapped/regtested x86_64-linux.
gcc/ChangeLog:
PR ipa/114790
* cgraph.cc (cgraph_update_edges_for_call_stmt_node): Resolve
devirtualization
if call statement was optimized out or turned to direct call.
gcc/testsuite/ChangeLog:
* g++.dg/lto/pr114790_0.C: New test.
* g++.dg/lto/pr114790_1.C: New test.
