PR target/42235
* postreload.c (reload_cse_move2add): Return bool, true if anything.
changed. All callers changed.
(move2add_use_add2_insn): Likewise.
(move2add_use_add3_insn): Likewise.
(reload_cse_regs): If reload_cse_move2add changed anything, rerun
reload_combine.
(RELOAD_COMBINE_MAX_USES): Bump to 16.
(last_jump_ruid): New static variable.
(struct reg_use): New members CONTAINING_MEM and RUID.
(reg_state): New members ALL_OFFSETS_MATCH and REAL_STORE_RUID.
(reload_combine_split_one_ruid, reload_combine_split_ruids,
reload_combine_purge_insn_uses, reload_combine_closest_single_use
reload_combine_purge_reg_uses_after_ruid,
reload_combine_recognize_const_pattern): New static functions.
(reload_combine_recognize_pattern): Verify that ALL_OFFSETS_MATCH
is true for our reg and that we have available index regs.
(reload_combine_note_use): New args RUID and CONTAINING_MEM. All
callers changed. Use them to initialize fields in struct reg_use.
(reload_combine): Initialize last_jump_ruid. Be careful when to
take PREV_INSN of the scanned insn. Update REAL_STORE_RUID fields.
Call reload_combine_recognize_const_pattern.
(reload_combine_note_store): Update REAL_STORE_RUID field.
* gcc.target/arm/pr42235.c: New test.
From-SVN: r162270
