https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113359
--- Comment #28 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-13 branch has been updated by Martin Jambor <jamb...@gcc.gnu.org>: https://gcc.gnu.org/g:10bf53a80eefa46500bffb442719777e2640e7d7 commit r13-8773-g10bf53a80eefa46500bffb442719777e2640e7d7 Author: Martin Jambor <mjam...@suse.cz> Date: Mon Apr 8 18:53:23 2024 +0200 ICF&SRA: Make ICF and SRA agree on padding PR 113359 shows that (at least with -fno-strict-aliasing) ICF can unify two functions which copy an aggregate type of the same size but then SRA, through its total scalarization, can copy the aggregate by pieces, skipping paddding, but the padding was not the same in the two original functions that ICF unified. This patch enhances SRA with the ability to collect padding information which then can be compared from within ICF. Unfortunately SRA uses OPTION_SET_P when determining its limits, so ICF needs to switch cfuns at least once to figure it out too. gcc/ChangeLog: 2024-03-27 Martin Jambor <mjam...@suse.cz> PR ipa/113359 * ipa-icf-gimple.h (func_checker): New members safe_for_total_scalarization_p, m_total_scalarization_limit_known_p and m_total_scalarization_limit. (func_checker::func_checker): Initialize new member variables. * ipa-icf-gimple.cc: Include tree-sra.h. (func_checker::func_checker): Initialize new member variables. (func_checker::safe_for_total_scalarization_p): New function. (func_checker::compare_operand): Use the new function. * tree-sra.h (sra_get_max_scalarization_size): Declare. (sra_total_scalarization_would_copy_same_data_p): Likewise. * tree-sra.cc (prepare_iteration_over_array_elts): New function. (class sra_padding_collecting): New. (sra_padding_collecting::record_padding): Likewise. (scalarizable_type_p): Rename to totally_scalarizable_type_p. Add ability to record padding when requested. (totally_scalarize_subtree): Split out gathering information necessary to iterate over array elements to prepare_iteration_over_array_elts. Fix errornous early exit. (analyze_all_variable_accesses): Adjust the call to totally_scalarizable_type_p. Move determining of total scalariation size limit... (sra_get_max_scalarization_size): ...here. (check_ts_and_push_padding_to_vec): New function. (sra_total_scalarization_would_copy_same_data_p): Likewise. gcc/testsuite/ChangeLog: 2024-03-27 Martin Jambor <mjam...@suse.cz> PR ipa/113359 * gcc.dg/lto/pr113359-1_0.c: New. * gcc.dg/lto/pr113359-1_1.c: Likewise. * gcc.dg/lto/pr113359-2_0.c: Likewise. * gcc.dg/lto/pr113359-2_1.c: Likewise. * gcc.dg/lto/pr113359-3_0.c: Likewise. * gcc.dg/lto/pr113359-3_1.c: Likewise. * gcc.dg/lto/pr113359-4_0.c: Likewise. * gcc.dg/lto/pr113359-4_1.c: Likewise. * gcc.dg/lto/pr113359-5_0.c: Likewise. * gcc.dg/lto/pr113359-5_1.c: Likewise. (cherry picked from commit 1e3312a25a7b34d6e3f549273e1674c7114e4408)
