ochangelog

这是完整的gcc源代码

	Use `emit' to handle a PARALLEL.
	(FAIL, DONE): Change to fit gen_expand changes.

	* emit-rtl.c (change_address): abort if arg isn't a MEM.

	* emit-rtl.c: Sequences work now by saving and restoring first_insn
	and last_insn.  So these variables are used even when in a sequence.
	emit_to_sequence has been deleted.
	(start_sequence, end_sequence): Save and restore first_insn, last_insn.
	(get_last_insn, add_insn): Sequences no longer need special treatment.
	(delete_insns_since, reorder_insns): likewise.
	(push_to_sequence): Set up to emit to a given existing insn chain.

	* emit-rtl.c (copy_rtx_if_shared): Don't copy INSNs.
	Insert missing return stmt in MEM case (for MEMs ok to share).
	(unshare_all_rtx): Now can copy the REG_NOTES simply.
	Copy the LOG_LINKS too.

	* emit-rtl.c (make_safe_from): Treat SUBREG as X like a REG.
	(delete_insns_since): Don't lose if FROM is the first insn.
	(emit): Declare void, since no useful value.
	Call simplejump_p properly.
	(restore_reg_data_1): When a reg is an address, do mark_reg_pointer.

	* dbxout.c (dbxout_types): Call dbxout_symbol to do the work.
	(dbxout_type_def): Deleted.
	(dbxout_symbol): Set TREE_ASM_WRITTEN when a TYPE_DECL is output.
	Don't output the same one twice. 

	* cse.c (fold_cc0): LABEL_REF is not zero.

	* cse.c (cse_insn): Don't insert src, dest if they are the same place.

	* cse.c (lookup_as_function): Return entire rtx, not just operand.
	(cse_insn): Caller changed.  Also, copy the result before inserting it.

	* cse.c (fold_rtx): Put constant arg last if commutative op.
	Handle idempotents and identities for mult, div, booleans, shifts.

	* cse.c (canon_hash): Parens were missing around shifts in "rotates".

	* c-convert.c (convert_to_integer): Truncate TRUTH_ANDIF_EXPR
	like TRUTH_AND_EXPR; OR also.

	* c-typeck.c (build_binary_op_nodefault): Do truthvalue_conversion
	for TRUTH_ANDIF, etc.
	(build_unary_op): More simplifications for TRUTH_NOT_EXPR;
	uses new fn `invert_truthvalue'.

	* recog.c (reg_fits_class_p): New name for reg_renumbered_fits_class_p
	since it no longer needs to renumber.  Also it now really assumes
	arg is a REG.  Callers changed.
	* reload.c: Callers changed.

	* recog.c (general_operand): (SUBREG (MEM...)) need not alter mode.
	(register_operand, nonmemory_operand): (SUBREG (MEM...)) is allowed.
	(memory_operand): (SUBREG (MEM...)) is *not* allowed.
	(mode_independent_operand): Operand names were backwards!
	(No change in effect of this function.)

	* print-tree.c (dump): Some expr nodes contain rtx's.  Print as rtx's.

Wed Sep 28 18:51:12 1988  Richard Stallman  (rms at sugar-bombs.ai.mit.edu)

	* reload1.c (choose_reload_targets): If a reload wanted a group,
	don't allow a single register for it.

Tue Sep 27 11:43:56 1988  Richard Stallman  (rms at sugar-bombs.ai.mit.edu)

	* final.c (output_addr_const): Handle DImode CONST_DOUBLEs.
	* tm-*.h (PRINT_OPERAND): Treat DImode CONST_DOUBLE like a CONST_INT.

	* vax.md (rotldi3): Insn deleted; it doesn't really exist.

	* toplev.c (report_error_function): Also mention the file name,
	for parallel makes.  New arg FILE; all callers changed.

Mon Sep 26 15:44:18 1988  Richard Stallman  (rms at sugar-bombs.ai.mit.edu)

	* expmed.c (expand_shift): When using extzv, convert OP1 to SImode.
	* c-typeck.c (build_binary_op_nodefault): Convert shift-count
	to int regardless of result type.

	* output-spur.c (output_move_double): Fix typo, optype0=>optype1.

	* expr.c (expand_call): Avoid null deref on result of FUNCTION_ARG.

	* tm-i386.h (FUNCTION_PROFILER): Use correct assembler syntax.

Sun Sep 25 12:13:56 1988  Richard Stallman  (rms at sugar-bombs.ai.mit.edu)

	* fixincludes: Handle some files in netdnet, netdna, vaxif, vaxuba.

	* reload.c (find_reloads): Make no optional reloads if not -O.

	* loop.c (strength_reduce): Can't eliminate a biv if it's used
	to compute a DEST_ADDR giv.  Only DEST_REG givs are safe.

	* loop.c (general_induction_var): Shift & divide ops are linear
	only in 1st operand; don't look for biv or giv in 2nd operand.

	* vax.md (fix_truncdfqi2): Use `%#'.

Sat Sep 24 00:25:48 1988  Richard Stallman  (rms at gluteus.ai.mit.edu)

	* loop.c (n_times_set, n_times_used): Now file-scope;
	no longer passed as args to several functions.

	* loop.c (basic_induction_var): Accept reg as source value
	only if it's invariant.
	(strength_reduce): Benefit calculation and threshold changed.
	Check reducibility of givs before trying to reduce them.
	Check eliminability of biv before considering the givs;
	let this affect the threshold.
	(record_giv): New subroutine adds a giv to the chain.

	* ns32k.md (incrementing sp): Use cmpd insns to increment by 4 or 8.

	* integrate.c (expand_inline_function): Rename return_label
	to local_return_label; avoid shadowing.

Fri Sep 23 13:57:52 1988  Richard Stallman  (rms at sugar-bombs.ai.mit.edu)

	* loop.c (loop_skip_over): Put the new label after the note that ends
	the loop.

	* loop.c: New function strength_reduce and subroutines.
	* toplev.c: New var flag_strength_reduce, set from -fstrength-reduce.

	* vax.md (sob insns): They were broken, with plus in one place
	and minus in another.  Use plus consistently.

	* rtl.h (REG_LIBCALL, REG_NONNEG): Two new kinds of reg-note.
	* optabs.c (expand_binop, expand_unop): Make REG_LIBCALL notes.
	* loop.c (scan_loop, move_movables): Move entire library calls.
	Use m->set_src to get the expression, in case it's from a REG_EQUAL.
	(consec_sets_invariant_p): Likewise.

	* loop.c (scan_loop): Start scan from loop_top, if entry is rearranged.
	Watch out for pseudo regs created by strength_reduce;
	they can't index regno_last_uid.
	(replace_regs): # regs mapped is now an arg.

	* loop.c (count_loop_regs_set): Don't increment n_times_set past 127.
	(consec_sets_invariant_p): Reject if N_SETS arg is 127.

	* toplev.c (rest_of_compilation): NREGS arg of loop_optimize deleted.

	* c-decl.c (store_parm_decls): Anything but an IDENTIFIER_NODE
	in SPECPARMS indicates a parmlist, not an identifier list.
	(get_parm_info): Use only PARM_DECLs when making the list of arg types.

	* combine.c (try_distrib): Boolean ops can't distribute through PLUS.
	MULT can distribute through PLUS and only PLUS.

Thu Sep 22 15:57:41 1988  Richard Stallman  (rms at sugar-bombs.ai.mit.edu)

	* jump.c (jump_optimize): uncond jump to a return becomes a return.

	* integrate.c (copy_parm_decls, copy_decl_tree): Set TREE_USED.
	Avoid inevitable "unused" warning for these decls.

	* c-typeck.c (comptypes): When comparing array types,
	ignore qualifiers of element type.

	* tm-*.h (ASM_OUTPUT_REG_PUSH, ASM_OUTPUT_REG_POP): Define new macros.
	* final.c (final_start_function): Use them to protect around
	the call to the profiling function.
	* stmt.c (expand_function_start): Set current_function_needs_context
	and current_function_returns_struct.

	* stmt.c (expand_null_return_1): If clear_pending_stack_adjust
	doesn't clear it, do the adjust now.
	* expr.c (clear_pending_stack_adjust): No-op if -finline-functions.

	* cccp.c (macarg1, skip_if_group): Backslash makes next char ordinary.

	* reload.c (find_reloads): Delete code to look for an equiv reg
	for a reg being input-reloaded.  This isn't safe.
	* reload1.c (choose_reload_targets): Do it here.

Wed Sep 21 00:36:22 1988  Richard Stallman  (rms at hobbes.ai.mit.edu)

	* tm-sun3.h (CPP_SPEC): Define it based on TARGET_DEFAULT.
	(STARTFILE_SPEC): Likewise.

	* reload1.c (choose_reload_targets): When redirecting prev insn
	into this insn's reload-reg, check this doesn't break the prev insn
	by giving it a reg it can't accept.  Use new fn constraint_all_regs_p.

	* tm-sparc.h (ASM_OUTPUT_LOCAL): Use .reserve, not .common.

	* tree.h (TREE_USED): New attribute macro.
	* c-parse.y (primary): Set TREE_USED in ..._DECL nodes.
	* toplev.c, flags.h: Define and set warn_unused.
	* stmt.c (expand_end_bindings): Warn if any var is unused.
	* print-tree.c (prtypeinfo): Print this attribute.

Tue Sep 20 15:29:01 1988  Richard Stallman  (rms at sugar-bombs.ai.mit.edu)

	* assert.h: `assert' must expand to an expression.
	Error message should show arg before expansion, not after.

	* c-decl.c (implicitly_declare): Make decl perm if !warn_implicit
	since start_function needs to look inside it in that case.

	* toplev.c (announce_function): If we don't print, don't record we did.

Mon Sep 19 15:21:11 1988  Richard Stallman  (rms at sugar-bombs.ai.mit.edu)

	* c-parse.y (structsp): If pedantic, warn if comma at end of enumlist.

	* reload.c (find_reloads): Check insn_code_number >= 0 when
	looking in insn_operand_strict_low.

	* tm-sun[23].h (CPP_SPEC): Rename __HAVE_FPU__ to __HAVE_68881__
	and put a space after that option.

Sun Sep 18 01:12:56 1988  Richard Stallman  (rms at hobbes.ai.mit.edu)

	* reload.c (find_reloads): Make optional reloads for explicit MEMs.

	* tm-m68k.h (MODES_TIEABLE_P): If no 68881, can tie fixed to floating.
	* m68k.md (movdi): Allow F's (can be DImode now).
	Don't allow f-regs (experiment).  Don't preference x-regs.
	(DImode push): Allow y-regs.
	(DFmode push): Allow y-regs, not x-regs.

	* reload1.c (modes_equiv_for_class_p): New function.
	(reload): Compare multiple modes for reg group with that function.
	Allows differing modes in some cases when not tieable.

	* c-parse.y (check_newline): Let ASM_OUTPUT_IDENT override .ident.
	* tm-3b1.h (ASM_OUTPUT_IDENT):  Define this as no-op.

	* emit-rtl.c (reorder_insns): Update sequence_{first,last}_insn if nec.
	(get_last_insn): If in a sequence, return last insn of sequence.
	(delete_insns_since): If in a sequence, set sequence_last_insn.

	* spur.md (CONST_DOUBLE load insn): Use & for most dests.
	(cond branches): pass additional args to output_compare.
	(movdf, movdi): Use & loading reg from mem.
	(trunc*): Enable these.
	(add): New pattern for adding large immediate operand.
	(shifts): A define_expand for each kind of shift,
	plus a recognizer which outputs repeated insns if necessary.
	(call*): Use r9 as temp, not r2.

	* output-spur.c (output_compare): New args NEG_{EXCHANGE_,}OPCODE.
	(singlemove_string): Handle reg as operand 1.
	(output_add_large_offset): Fake add insn with large immediate arg.
	(big_immediate_operand): Match such an arg.

	* tm-spur.h (FUNCTION_PROLOGUE): Align the stack pointer.
	Handle bigger frames.
	(TARGET_LONG_JUMP, TARGET_EXPAND_SHIFT): New target flags.

	* va-spur.h: Track position in regs and stack separately.

	* c-decl.c (duplicate_decls): Warn if prototype follows
	non-prototype definition.

Sat Sep 17 14:30:23 1988  Richard Stallman  (rms at sugar-bombs.ai.mit.edu)

	* expr.c (expand_builtin): Avoid crash if arg isn't integer type.

	* c-decl.c (duplicate_decls): Just warn if redeclaring a builtin,
	and leave it built in unless it is redefined.

	* vax.md (ashlsi3): Use addl3, moval or movad when useful.
	(addsi3): Avoid pushab, movab for constants < 64.
	Do use movab when > 64 when operands match.
	(mov*i): Use mcom* rather than mneg*.
	Use add*3 with two quick immediate args when useful.
	(movhi): Don't use movzbw or cvtbw; said to be slow.

	* rtl.h: New macros MEM_VOLATILE_P, MEM_IN_STRUCT_P,
	INSN_DELETED_P,	REG_USER_VAR_P, RTX_UNCHANGING_P, RTX_INTEGRATED_P,
	CONSTANT_POOL_ADDRESS_P.
	Most places changed to use them.

Fri Sep 16 11:50:15 1988  Richard Stallman  (rms at sugar-bombs.ai.mit.edu)

	* jump.c (jump_optimize): Was testing volatil on non-MEMs erroneously
	when looking for no-op move insns.

	* cccp.c (handle_directive): Ignore comments between # and directive.

	* integrate.c (copy_rtx_and_substitute): Stack-push memrefs need
	to be copied.

	* tm-bsd386.h (ASM_OUTPUT_DOUBLE): Undef previous def.

	* reload1.c (alter_reg): Don't reuse spill_stack_slot
	if it isn't big enough for this reg's mode.

	* expr.c (emit_move_insn): After force_const_mem, ensure
	mem address is valid.
	(move_block_to_reg, move_block_from_reg): Likewise.

	* expr.c (expand_call): Spurious TREE_VALUE on args[i].tree_value.

	* m68k.md (zero_extend*): Require register_operand for operand 0.

	* stdarg.h (va_start): Alternate defn for sparc.

Thu Sep 15 11:39:06 1988  Richard Stallman  (rms at sugar-bombs.ai.mit.edu)

	* c-parse.y (yylex): When atof gives ERANGE, check for "0.0", etc.

	* assert.h (__assert): Alternative definition for -traditional.

	* output-sparc.c (output_block_move): Initialize xoperands.

	* combine.c (try_combine): Never subst for a reg that is incremented.

	* m68k.md (cmpm pattern): Make the match_operands match memrefs
	and check that they are pushes in the extra condition.
	This makes reloading handle the pushes properly.

	* expr.c (MOVE_RATIO): Make it 15.  Allow overriding it.

Wed Sep 14 09:50:08 1988  Richard Stallman  (rms at sugar-bombs.ai.mit.edu)

	* c-decl.c (build_enumerator): Use saveable_tree_cons.

	* vax.md (movdf): Use movq when safe.

	* Version 1.28 released.

	* tm-sparc.h (FIRST_PARM_CALLER_OFFSET): Defined.

Tue Sep 13 00:11:37 1988  Richard