[Bug rtl-optimization/20070] If-conversion can't match equivalent code, and cross-jumping only works for literal matches

["amylaar at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>]

------- Comment #23 from amylaar at gcc dot gnu dot org  2005-12-13 13:04 -------
Subject: Bug 20070

Author: amylaar
Date: Tue Dec 13 13:04:18 2005
New Revision: 108480

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=108480
Log:
        PR rtl-optimization/20070 / part1
        * flow.c (update_life_info): If PROP_POST_REGSTACK is set, call
        count_or_remove_death_notes with kill == -1.
        (mark_set_1): Don't add REG_DEAD / REG_UNUSED notes for stack
        registers if PROP_POST_REGSTACK is set.
        (mark_used_reg): Likewise.
        (count_or_remove_death_notes): If kill is -1, don't remove REG_DEAD /
        REG_UNUSED notes for stack regs.
        * cfgcleanup.c (condjump_equiv_p): Change parameters and processing
        to match rtx_equiv_p machinery.  Change caller.
        (outgoing_edges_match): Likewise.
        (try_crossjump_to_edge): Use struct_equiv_block_eq
        instead of flow_find_cross_jump.
        * basic-block.h (PROP_POST_REGSTACK, STRUCT_EQUIV_START): Define.
        (STRUCT_EQUIV_RERUN, STRUCT_EQUIV_FINAL): Likewise.
        (STRUCT_EQUIV_NEED_FULL_BLOCK, STRUCT_EQUIV_MATCH_JUMPS): Likewise.
        (STRUCT_EQUIV_MAX_LOCAL): Likewise.
        (struct struct_equiv_checkpoint, struct equiv_info): Likewise.
        (insns_match_p): Update prototype.
        (flow_find_cross_jump): Remove prototype.
        (struct_equiv_block_eq, struct_equiv_init): Declare.
        (rtx_equiv_p, condjump_equiv_p): Likewise.
        * struct-equiv.c: Include reload.h.
        (IMPOSSIBLE_MOVE_FACTOR): Define.
        (assign_reg_reg_set, struct_equiv_make_checkpoint): New functions.
        (struct_equiv_improve_checkpoint): Likewise.
        (struct_equiv_restore_checkpoint, rtx_equiv_p): Likewise.
        (set_dest_equiv_p, set_dest_addr_equiv_p, struct_equiv_init): Likewise.
        (struct_equiv_merge, find_dying_input): Likewise.
        (resolve_input_conflict, note_local_live): Likewise.
        (death_notes_match_p): Change parameters and processing
        to match rtx_equiv_p machinery.  Change caller.
        (insns_match_p): Likewise.
        (flow_find_cross_jump): Replace with:
        (struct_equiv_block_eq).

        Back out this change:
        2005-03-07  Kazu Hirata  <kazu@cs.umass.edu>
          * recog.c (verify_changes): Make it static.
          * recog.h: Remove the corresponding prototype.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/basic-block.h
    trunk/gcc/cfgcleanup.c
    trunk/gcc/flow.c
    trunk/gcc/recog.c
    trunk/gcc/recog.h
    trunk/gcc/struct-equiv.c


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20070