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(ssa.o): Updated target to include ssa.h.
(flow.o): Likewise.
(toplev.o): Likewise.
(dce.o): Created target.
* basic-block.h: Added comments.
(INVALID_BLOCK): Added definition.
(connect_infinite_loops_to_exit): Added declaration.
Moved SSA declarations to ssa.h.
* flow.c: Added inclusion of ssa.h.
(struct depth_first_search_dsS, depth_first_search_ds):
Added definitions.
(compute_immediate_postdominators): Added definition.
(connect_infinite_loops_to_exit): Likewise.
(flow_dfs_compute_reverse_init): Likewise.
(flow_dfs_compute_reverse_add_bb): Likewise.
(flow_dfs_compute_reverse_execute): Likewise.
(flow_dfs_compute_reverse_finish): Likewise.
* rtl.h (rtx/in_struct): Added use to determine insn necessity.
(LABEL_P): Added definition.
(JUMP_P): Likewise.
(NOTE_P): Likewise.
(BARRIER_P): Likewise.
(JUMP_TABLE_DATA_P): Likewise.
(INSN_DEAD_CODE_P): Likewise.
* ssa.c: Replaced inclusions with ssa.h inclusion.
(CONVERT_HARD_REGISTER_TO_SSA_P): Moved to ssa.h.
(rename_registers): Removed unnecessary variables.
* ssa.h: Created by moving declarations from ssa.c and
basic-block.h.
* timevar.def: Defined TV_DEAD_CODE_ELIM.
* toplev.c: Added ssa.h inclusion.
(dump_file_index): Added DFI_dce.
(dump_file): Added "dce" entry.
Defined flag_ssa.
(f_options): Added dce entry.
* invoke.texi: Document -fdce. Emphasize experimental status of
-fssa.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@35419 138bc75d-0d04-0410-961f-82ee72b054a4
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