changelog.8

gcc库的原代码,对编程有很大帮助.

Sat Jan  8 14:54:06 1994  Doug Evans  ([e-mail])

	* toplev.c (rest_of_compilation): jump_optimize can change max_reg_num
	so rerun reg_scan before calling cse_main.

Fri Jan  7 20:34:14 1994  Torbjorn Granlund  ([e-mail])

	* config/alpha/alpha.h (RTX_COSTS): Return actual costs for
	multiplication.

Tue Jan  4 13:44:09 1994  Jim Wilson  ([e-mail])

	* sdbout.c (sdbout_symbol): Handle variables at zero offset from
	frame pointer.

Tue Jan  4 07:35:05 1994  Richard Kenner  ([e-mail])

	* tree.c (substitute_expr): Don't abort for RTL_EXPR and
	SAVE_EXPR; just do nothing.

Tue Jan  4 00:52:15 1994  Jeffrey A. Law  ([e-mail])

	* pa.md (andsi3): Use "?" instead of "!" to avoid losing
	in some cases.

Mon Jan  3 16:59:34 1994  Torbjorn Granlund  ([e-mail])

	* jump.c (thread_jumps): Don't thread to loop label;
	create new label before loop instead.
	(thread_jumps): Rename argument `verbose' -> `flag_before_jump'.
	* toplev.c (rest_of_compilation): Pass 1 for flag_before_jump
	first time we call thread_jumps.

	* c-typeck (build_binary_op, case *_DIV_EXPR): Use same shorten
	condition as for *_MOD_EXPR.

Mon Jan  3 08:00:16 1994  Richard Kenner  ([e-mail])

	* fold-const.c (truth_value_p): New function.
	(fold): Use it to see when we should make a TRUTH_{AND,OR}_EXPR.
	(fold, case TRUTH_{AND,OR,ANDIF,ORIF}_EXPR): Use distributive
	law on expressions such as (A && B) || (A && C).

Sun Jan  2 08:14:38 1994  Richard Kenner  ([e-mail])

	* cse.c (simplify_relational_operation): Correct declaration of
	variables holding parts of constants.

Fri Dec 31 06:27:57 1993  Richard Kenner  ([e-mail])

	* toplev.c (main): Turn on -fomit-frame-pointer if it is safe.
	Add -O3, which turns on -finline-functions.
	* a29k.h, alpha.h, clipper.h, h8300.h, m88k.h, pa.h, romp.h, rs6000.h:
	Define CAN_DEBUG_WITHOUT_FP; delete OPTIMIZATION_OPTIONS.
	* sh.h, sparc.h: Likewise.
	* arm.h: Delete OPTIMIZATION_OPTIONS.
	* h8300.h: Define NO_FUNCTION_CSE and CAN_DEBUG_WITHOUT_FP;
	delete OVERRIDE_OPTIONS.
	* i960.h (OPTIMIZATION_OPTIONS): Just turn on machine-specific opts.
	(CAN_DEBUG_WITHOUT_FP): Define.
	* mips.h (CAN_DEBUG_WITHOUT_FP): Define.
	(OPTIMIZATION_LEVELS): Just set MASK_GPOPT.

	* cse.c (simplify_relational_operation): Rewrite and simplify.
	Add case when we can simplify A-B for compare of A and B.

	* combine.c (added_links_insn): New variable.
	(distribute_links): Set it.
	(if_then_else_cond): New function.
	(try_combine): Return added_links_insn if it is earlier than what
	we would otherwise return.
	(subst): Generalize (OP X Y) to call if_then_else_cond
	instead of only checking for an explicit IF_THEN_ELSE.
	(subst, case IF_THEN_ELSE): When converting to a MULT, simplify
	the MULT before putting it into OP.
	(subst, case AND): Don't make IF_THEN_ELSE here; now made in
	generic case earlier.

	* combine.c (force_to_mode): Add new parm JUST_SELECT; all
	callers changed.

Wed Dec 29 18:05:00 1993  Leonid Baraz  ([e-mail])

	* fold-const.c (fold, case PLUS_EXPR): Add a missing test of 
	flag_fast_math.

Wed Dec 29 06:52:07 1993  Richard Kenner  ([e-mail])

	* cse.c (simplify_binary_operation, case MULT): Don't convert
	to ASHIFT if still generating RTL.

Mon Dec 27 22:15:55 1993  Ian Lance Taylor  ([e-mail])

	* fixincludes: Do not fix <sundev/ipi_error.h>, because SunOS
	sed can not handle the very large macro it contains.

Mon Dec 27 06:28:48 1993  Richard Kenner  ([e-mail])

	* alpha.md (maxsf3, minsf3): Correct numerous errors.

	* combine.c (subst, case MINUS): Allow some FP simplifications 
	if -ffast-math.
	(reversible_comparison_p): FP comparisons reversible with -ffast-math.
	* cse.c (simplify_binary_operation, fold_rtx): Allow some FP
	simplications with -ffast-math.
	(simplify_relational_operation): FP comparisons can be reversed
	if -ffast-math is specified.
	* fold-const.c (fold): Simplify more FP ops if -ffast-math.
	* jump.c (can_reverse_comparison_p): Return 1 if -ffast-math.
	* loop.c (get_condition): Can reverse comparison if -ffast-math.

	* alpha.c (ior_operand): New function.
	* alpha.h (PREDICATE_CODES): Add ior_operand.
	* alpha.md (iordi3): Use ornot for some constant cases.

Sun Dec 26 07:55:26 1993  Richard Kenner  ([e-mail])

	* expr.c (do_tablejump): Call emit_cmp_insn with likely-constant
	as second operand.

	* jump.c (jump_optimize): When deleting an insn after a jump,
	update reallabelprev since it might point to the deleted insn.

	* cse.c (count_reg_usage): Don't count a register used within
	a SET that sets it.
	(delete_dead_from_cse): Pass new parm to count_reg_usage.

	* cse.c (fold_rtx, case PLUS): If we have (plus A B), A is
	equivalent to a negative constant, and the negated constant is in
	register, convert to (minus A C) where C is the register containing
	the negated constant.

Sat Dec 25 23:47:01 1993  Jeffrey A. Law  ([e-mail])

	* pa.h (DBX_BLOCKS_FUNCTION_RELATIVE): Define.
	(ASM_OUTPUT_SOURCE_LINE): Likewise.
	(DBX_FUNCTION_FIRST): Likewise.

	* pa.h (FRAME_POINTER_REGNUM, ARG_POINTER_REGNUM): Change to %r3
	for compatability with HP compilers.

	* pa.h (READONLY_DATA_SECTION): Re-enable use of $LIT$.

Sat Dec 25 06:05:28 1993  Richard Kenner  ([e-mail])

	* emit-rtl.c (gen_reg_rtx): Only clear part of arrays we aren't
	going to copy into.

	* expr.c (expand_expr, case CONSTRUCTOR): If have a target,
	don't build constructor into memory.

	* expr.c (expand_expr, case ARRAY_REF): Remove uses of *_type_node
	and simplify folding a reference to a character in a STRING_CST.

	* a29k.c, a29k.h: Rename R_ACC to R_ACU to not conflict with access.h.

	* m68k/crds.h (HAVE_VPRINTF): Delete from here.
	* m68k/xm-crds.h (HAVE_VPRINTF): Define.
	* m68k/dpx2.h (USG): Delete from here (already in xm.h file).

	* print-tree.c (print_node, print_node_brief): Say something
	when TREE_CONSTANT_OVERFLOW is set.

	* loop.c (check_dbra_loop): Fix error in previous change.

	* combine.c (set_nonzero_bits_and_sign_copies, nonzero_bits):
	Fix errors in SHORT_IMMEDIATES_SIGN_EXTEND code.

	* alpha.h (FUNCTION_ARG): Pass complex float in float regs.

	* fold-const.c (fold, case EQ_EXPR, NE_EXPR): If COMPLEX_TYPE
	and at least one arg is a COMPLEX_EXPR, split into a logical
	operation on the real and imaginary parts.

	* c-typeck.c (common_type): For COMPLEX_TYPE, return one of the
	original types if is the desired common type.
	(build_binary_op): Use SHORT_COMPARE code even if complex.	

	* c-decl.c (grokdeclarator): Properly validate __complex__ and
	create the various kinds of complex integer types.

	* cse.c (simplify_unary_operations): Check that operations really
	are double-word before doing them.

Fri Dec 24 15:21:16 1993  Jim Wilson  ([e-mail])

	* cccp.c (read_name_map, read_filename_string, open_include_file):
	New functions.
	(struct file_name_list): New members: name_map, got_name_map.
	(main, path_include, do_include, do_once): Set got_name_map.
	(do_include): Use open_include_file instead of open.  Add new
	parameter to lookup_import calls.
	(lookup_import): New parameter searchptr.  Call open_include_file
	instead of open.

	* expr.c (convert_modes): Can't truncate REG with gen_lowpart if
	TRULY_NOOP_TRUNCATION doesn't allow it.

Fri Dec 24 14:36:53 1993  Jeffrey A. Law  ([e-mail])

	* cse.c (cse_insn): Set "cse_jumps_altered" when collapsing
	a switch statement into an unconditional jump.
	* toplev.c (rest_of_compilation): Rerun jump_optimize
	before the second CSE pass.

Fri Dec 24 05:34:38 1993  Richard Kenner  ([e-mail])

	* cse.c (simplify_binary_operation, case PLUS, MINUS):
	Simplify such things as (X >> 1) - X.

	* alpha.md (define_attr type): Add new type ISUBR.
	(divmod): Set to type ISUBR.
	* alpha.c (output_prolog): Need GP if type ISUBR.

	* reload.c (push_reload, find_reloads): Reload inside a paradoxical
	SUBREG of MEM except don't force a reload unless the inner mode
	is narrower than BIGGEST_ALIGNMENT.

	* c-typeck.c (check_init_type_bitfields): Check recursively inside
	arrays and records.

	* c-parse.in (attrib): Allow expressions instead of constants.
	* c-common.c (decl_attribute): Verify that alignment and format
	argument numbers are all integer constants.
	Continue on to next attribute if one is in error.

	* cse.c (simplify_binary_operation): Can fold multi-word
	operations when first is CONST_INT.
	(simplify_binary_operation, case PLUS, MINUS): Don't call
	plus_constant when OP0 is VOIDmode.

	* c-typeck.c (pop_init_level): Don't abort if have incomplete array
	type inside some other type.

Thu Dec 23 22:06:21 1993  Torbjorn Granlund  ([e-mail])

	* jump.c (thread_jumps): Delete redundant loop termination test.

	* cse.c (simplify_binary_operation, case *SHIFT*): Reduce arg1 as
	defined by SHIFT_COUNT_TRUNCATED.

	* config/pa/pa.c (Several places): Declare values from INTVAL(x) as
	HOST_WIDE_INT.
	(uint32_operand): New function.
	(output_block_move): Change unroll threshold from 64 to 32.
	(compute_movstrsi_length): Corresponding change.
	(print_operand): Don't call debug_rtx, just abort.

	* config/pa/pa.h (FUNCTION_INCOMING_ARG): Delete definition.
	(RTX_COSTS) [PLUS]: Rewrite.
	(output_scc_insn): Delete.
	(output_floatsisf2): Delete.
	(output_floatsidf2): Delete.
	(PREDICATE_CODES): Define, but leave within #if 0 for now.

	* config/pa/pa.md (iorscc): New recognizer.
	2 new recognizers for sub;subb.  1 new recognizer for addi;subb.
	(movstrsi): Remove predicates.  Set inline threshold to 8.
	(umulsidi3): Change predicates to nonimmediate_operand.
	New recognizer for multiply-by-immediate.
	(andsi3): Add `!' for register alternative.
	(vdepi_ior, vdepi_and): New recognizers.
	(vextru rx,1,ry, vextrs rx,1,ry): New recognizers.

	* config/pa/pa.c (initialize_pic): Delete.
	(finalize_pic): Use PIC_OFFSET_TABLE_REGNUM rather than 19.
	* config/pa/pa.h (CONDITIONAL_REGISTER_USAGE): Never make
	PIC_OFFSET_TABLE_REGNUM fixed.
	(INITIALIZE_PIC): Delete.
	* config/pa/pa.md (call, call_value): If PIC, emit USE for for
	PIC_OFFSET_TABLE_REGNUM.  Use PIC_OFFSET_TABLE_REGNUM rather than 19.

Thu Dec 23 18:51:12 1993  Jim Wilson  ([e-mail])

	* local-alloc.c (optimize_reg_copy_1): After decreasing sregno's
	reg_live_length, correct it if it is now obviously too small.

	* loop.c (check_dbra_loop): Don't reverse loop if there is a
	single memory store to an invariant address.

	* gcc.c (translate_options): Skip arguments of -B, -b, -V, -x,
	and -Xlinker options.

	* configure (riscos-*-*): Use fixincludes instead of fixinc.mips.
	* fixinc.mips: Delete file.
	* fixincludes: Merge in changes from fixinc.mips.  Fix identifiers
	host_mips, mips, MIPSE[LB], R[34]000, SYSTYPE_*.  Fix size_t uses
	in stddef.h, memory.h, unistd.h.  Fix /**/ in bsd43/bsd43_.h.

Thu Dec 23 18:28:02 1993  Richard Earnshaw  ([e-mail])

	* expmed.c (expand_mult): Preserve useful sub-expressions when
	 expanding a synthesized mult.

Thu Dec 23 18:21:34 1993  Russ Noseworthy  ([e-mail])

	* configure (m68k-wrs-vxworks): New, same as m68k-sun-sunos*.

Thu Dec 23 09:03:30 1993  Phil Nelson  ([e-mail])

	* ns32k.h (ASM_OUTPUT_ADDR_DIFF_ELT): Use .long, not .double.

Thu Dec 23 07:30:24 1993  Richard Kenner  ([e-mail])

	* Makefile.in (libgcc.a): Allow chmod of tmpcopy directory to
	fail since it can be empty.

	* gcc.c (default_compilers, gnat1): Don't write -gnatb.

	* c-common.c (T_ST): Fix typo in last change.

	* expr.c (expand_expr, case MINUS_EXPR): When expanding an
	initializer, use plus_constant as appropriate.

	* collect2.c (main): When searching compiler directories, 
	look for ld_suffix, not full_ld_suffix.

	* a29k/unix.h (TARGET_DEFAULT): Update to use new values.

	* Makefile.in (GCC_CFLAGS): Add -I./include.

Thu Dec 23 06:57:39 1993  Chip Salzenberg  ([e-mail])

	* Makefile.in (ENQUIRE_CFLAGS): Omit -DNO_STDDEF.
	(USE_ALLOCA): Allow ${ALLOCA} to begin with a dash.
	(OBJC, OBJECTIVE-C): Depend on objc-runtime.
	(objc-headers): Make include directory if missing.

	* xm-svr3.h (HAVE_VPRINTF): Define.

	* cse.c (delete_reg_equiv): Don't reference elements of
	REG_{NEXT,PREV}_EQV that are not defined.

Wed Dec 22 14:21:49 1993  Jim Wilson  ([e-mail])

	* dbxout.c (dbxout_parms): For parameter passed by invisible
	reference, use DECL_INCOMING_RTL if DECL_RTL is a pseudo-reg address.

	* xcoffout.h (DBX_FINISH_SYMBOL): Get variable name from DECL_RTL
	instead of from DECL_ASSEMBLER_NAME.