https://gcc.gnu.org/g:0923fe2d4808c16b72c1d1bfe28220dd326d8b76
commit r14-9705-g0923fe2d4808c16b72c1d1bfe28220dd326d8b76 Author: Jan Hubicka <j...@suse.cz> Date: Thu Mar 28 13:24:54 2024 +0100 Hash operands of PHI in ipa-icf This patch fixes cache colision on function whose body differs only by constants at PHI operands. As for if (test) a = cst1; else a = cst2; gcc/ChangeLog: PR middle-end/113907 * ipa-icf.cc (sem_function::init): Hash PHI operands (sem_function::compare_phi_node): Add argument about preserving order Diff: --- gcc/ipa-icf.cc | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/gcc/ipa-icf.cc b/gcc/ipa-icf.cc index 120d8544988..e84922c3ef8 100644 --- a/gcc/ipa-icf.cc +++ b/gcc/ipa-icf.cc @@ -1387,6 +1387,23 @@ sem_function::init (ipa_icf_gimple::func_checker *checker) cfg_checksum = iterative_hash_host_wide_int (e->flags, cfg_checksum); + /* TODO: We should be able to match PHIs with different order of + parameters. This needs to be also updated in + sem_function::compare_phi_node. */ + gphi_iterator si; + for (si = gsi_start_nonvirtual_phis (bb); !gsi_end_p (si); + gsi_next_nonvirtual_phi (&si)) + { + hstate.add_int (GIMPLE_PHI); + gphi *phi = si.phi (); + m_checker->hash_operand (gimple_phi_result (phi), hstate, 0, + func_checker::OP_NORMAL); + hstate.add_int (gimple_phi_num_args (phi)); + for (unsigned int i = 0; i < gimple_phi_num_args (phi); i++) + m_checker->hash_operand (gimple_phi_arg_def (phi, i), + hstate, 0, func_checker::OP_NORMAL); + } + for (gimple_stmt_iterator gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi)) { @@ -1579,6 +1596,8 @@ sem_function::compare_phi_node (basic_block bb1, basic_block bb2) if (size1 != size2) return return_false (); + /* TODO: We should be able to match PHIs with different order of + parameters. This needs to be also updated in sem_function::init. */ for (i = 0; i < size1; ++i) { t1 = gimple_phi_arg (phi1, i)->def;