dsp16xx.h

gcc库的原代码,对编程有很大帮助.

/* Definitions of target machine for GNU compiler.  AT&T DSP1600.
   Copyright (C) 1994, 1995 Free Software Foundation, Inc.
   Contributed by Michael Collison ([e-mail]).

This file is part of GNU CC.

GNU CC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 1, or (at your option)
any later version.

GNU CC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU CC; see the file COPYING.  If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

extern char *low_reg_names[];
extern char *text_seg_name;
extern char *rsect_text;
extern char *data_seg_name;
extern char *rsect_data;
extern char *bss_seg_name;
extern char *rsect_bss;
extern char *const_seg_name;
extern char *rsect_const;
extern char *chip_name;
extern char *save_chip_name;
extern struct rtx_def *dsp16xx_compare_op0, *dsp16xx_compare_op1;
extern struct rtx_def *(*dsp16xx_compare_gen)();
extern struct rtx_def *gen_compare_reg();
extern struct rtx_def *dsp16xx_addhf3_libcall;
extern struct rtx_def *dsp16xx_subhf3_libcall;
extern struct rtx_def *dsp16xx_mulhf3_libcall;
extern struct rtx_def *dsp16xx_divhf3_libcall;
extern struct rtx_def *dsp16xx_cmphf3_libcall;
extern struct rtx_def *dsp16xx_fixhfhi2_libcall;
extern struct rtx_def *dsp16xx_floathihf2_libcall;
extern struct rtx_def *dsp16xx_neghf2_libcall;
extern struct rtx_def *dsp16xx_umulhi3_libcall;
extern struct rtx_def *dsp16xx_mulhi3_libcall;
extern struct rtx_def *dsp16xx_udivqi3_libcall;
extern struct rtx_def *dsp16xx_udivhi3_libcall;
extern struct rtx_def *dsp16xx_divqi3_libcall;
extern struct rtx_def *dsp16xx_divhi3_libcall;
extern struct rtx_def *dsp16xx_modqi3_libcall;
extern struct rtx_def *dsp16xx_modhi3_libcall;
extern struct rtx_def *dsp16xx_umodqi3_libcall;
extern struct rtx_def *dsp16xx_umodhi3_libcall;

extern struct rtx_def *dsp16xx_ashrhi3_libcall;
extern struct rtx_def *dsp16xx_ashlhi3_libcall;
extern struct rtx_def *dsp16xx_lshrhi3_libcall;


extern int hard_regno_mode_ok ();
extern enum reg_class dsp16xx_reg_class_from_letter ();
extern enum reg_class dsp16xx_limit_reload_class ();
extern int hard_regno_nregs ();
extern int regno_reg_class ();
extern int move_operand ();
extern int symbolic_address_p ();
extern int Y_address ();
extern int call_address_operand ();
extern void notice_update_cc();
extern void function_prologue ();
extern void function_epilogue ();
extern int  dsp1600_comparison_reverse ();
extern void double_reg_from_memory ();
extern void double_reg_to_memory ();
extern void bss_section ();
extern struct rtx_def *dsp16xx_function_arg ();
extern void dsp16xx_function_arg_advance ();
extern enum rtx_code next_cc_user_code ();
extern enum rtx_code save_next_cc_user_code;
extern struct rtx_def *gen_tst_reg ();
extern char *output_block_move();

/* RUN-TIME TARGET SPECIFICATION */
#define DSP16XX   1

/* Name of the AT&T assembler */

#define ASM_PROG "as1600"

/* Name of the AT&T linker */

#define LD_PROG "ld1600"

/* Define which switches take word arguments */
#define WORD_SWITCH_TAKES_ARG(STR)              \
  (!strcmp (STR, "ifile") ? 1 :                 \
   0)

#ifdef  CC1_SPEC
#undef  CC1_SPEC
#endif
#define CC1_SPEC       ""

/* Define this as a spec to call the AT&T assembler */

#define CROSS_ASM_SPEC   "%{!S:as1600 %a %i\n }"

/* Define this as a spec to call the AT&T linker */

#define CROSS_LINK_SPEC  "%{!c:%{!M:%{!MM:%{!E:%{!S:ld1600 %l %X %{o*} %{m} \
			%{r} %{s} %{t} %{u*} %{x}\
			%{!A:%{!nostdlib:%{!nostartfiles:%S}}} %{static:}\
			%{L*} %D %o %{!nostdlib:-le1600 %L -le1600}\
			%{!A:%{!nostdlib:%{!nostartfiles:%E}}}\n }}}}}"

/* Nothing complicated here, just link with libc.a under normal
   circumstances */
#define LIB_SPEC "-lc"

/* Specify the startup file to link with. */
#define STARTFILE_SPEC "%{mmap1:m1_crt0.o%s}  \
%{mmap2:m2_crt0.o%s}                          \
%{mmap3:m3_crt0.o%s}                          \
%{mmap4:m4_crt0.o%s}                          \
%{!mmap*: %{!ifile*: m4_crt0.o%s} %{ifile*:     \
%eA -ifile option requires a -map option}}"

/* Specify the end file to link with */

#define ENDFILE_SPEC "%{mmap1:m1_crtn.o%s}  \
%{mmap2:m2_crtn.o%s}                          \
%{mmap3:m3_crtn.o%s}                          \
%{mmap4:m4_crtn.o%s}                          \
%{!mmap*: %{!ifile*: m4_crtn.o%s} %{ifile*:     \
%eA -ifile option requires a -map option}}"


/* Tell gcc where to look for the startfile */
#define STANDARD_STARTFILE_PREFIX   "/d1600/lib"

/* Tell gcc where to look for it's executables */
#define STANDARD_EXEC_PREFIX  "/d1600/bin"

/* Command line options to the AT&T assembler */
#define ASM_SPEC  "%{V} %{v:%{!V:-V}} %{g*:-g}"

/* Command line options for the AT&T linker */
#define LINK_SPEC "%{V} %{v:%{!V:-V}} %{minit:-i}  \
%{!ifile*:%{mmap1:-ifile m1_deflt.if%s}         \
          %{mmap2:-ifile m2_deflt.if%s}         \
          %{mmap3:-ifile m3_deflt.if%s}         \
          %{mmap4:-ifile m4_deflt.if%s}         \
          %{!mmap*:-ifile m4_deflt.if%s}}       \
%{ifile*} %{!r:-a}"

/* Names to predefine in the preprocessor for this target machine.  */
#ifdef __MSDOS__
#define CPP_PREDEFINES "-Ddsp1600 -DDSP1600 -DMSDOS"
#else
#define CPP_PREDEFINES "-Ddsp1600 -DDSP1600 -Ddsp1610 -DDSP1610"
#endif

/* Run-time compilation parameters selecting different hardware subsets.  */

extern int target_flags;

/* Macros used in the machine description to test the flags.  */

#define MASK_REGPARM         0x00000001    /* Pass parameters in registers */
#define MASK_NEAR_CALL       0x00000002    /* The call is on the same 4k page */
#define MASK_NEAR_JUMP       0x00000004    /* The jump is on the same 4k page */
#define MASK_BMU             0x00000008    /* Use the 'bmu' shift instructions */
#define MASK_OPTIMIZE_MEMORY 0x00000010    /* Optimize to conserve memory */
#define MASK_OPTIMIZE_SPEED  0x00000020    /* Optimize for speed */
#define MASK_MAP1            0x00000040    /* Link with map1 */
#define MASK_MAP2            0x00000080    /* Link with map2 */
#define MASK_MAP3            0x00000100    /* Link with map3 */
#define MASK_MAP4            0x00000200    /* Link with map4 */
#define MASK_YBASE_HIGH      0x00000400    /* The ybase register window starts high */
#define MASK_INIT	     0x00000800    /* Have the linker generate tables to
					      initialize data at startup */
#define MASK_INLINE_MULT     0x00001000    /* Inline 32 bit multiplies */
#define MASK_RESERVE_YBASE   0x00002000    /* Reserved the ybase registers */

/* Compile passing first two args in regs 0 and 1.
   This exists only to test compiler features that will
   be needed for RISC chips.  It is not usable
   and is not intended to be usable on this cpu.  */
#define TARGET_REGPARM   (target_flags & MASK_REGPARM)

/* The call is on the same 4k page, so instead of loading
   the 'pt' register and branching, we can branch directly */

#define TARGET_NEAR_CALL (target_flags & MASK_NEAR_CALL)

/* The jump is on the same 4k page, so instead of loading
   the 'pt' register and branching, we can branch directly */

#define TARGET_NEAR_JUMP (target_flags & MASK_NEAR_JUMP)

/* Generate shift instructions to use the 1610 Bit Manipulation
   Unit. */
#define TARGET_BMU (target_flags & MASK_BMU)

/* Optimize to conserve memory */
#define TARGET_OPTIMIZE_MEMORY (target_flags & MASK_OPTIMIZE_MEMORY)

/* Optimize for maximum speed */
#define TARGET_OPTIMIZE_SPEED   (target_flags & MASK_OPTIMIZE_SPEED)

#define TARGET_YBASE_HIGH (target_flags & MASK_YBASE_HIGH)

/* Direct the linker to output extra info for initialized data */
#define TARGET_MASK_INIT (target_flags & MASK_INIT)

#define TARGET_INLINE_MULT (target_flags & MASK_INLINE_MULT)

/* Reserve the ybase registers *(0) - *(31) */
#define TARGET_RESERVE_YBASE (target_flags & MASK_RESERVE_YBASE)

/* Macro to define tables used to set the flags.
   This is a list in braces of pairs in braces,
   each pair being { "NAME", VALUE }
   where VALUE is the bits to set or minus the bits to clear.
   An empty string NAME is used to identify the default VALUE.  */


#define TARGET_SWITCHES                        \
  {				               \
    { "regparm",       MASK_REGPARM},	       \
    { "no-regparm",   -MASK_REGPARM},	       \
    { "no-near-call", -MASK_NEAR_CALL},        \
    { "near-jump",     MASK_NEAR_JUMP},        \
    { "no-near-jump", -MASK_NEAR_JUMP},        \
    { "bmu",           MASK_BMU},              \
    { "no-bmu",       -MASK_BMU},              \
    { "Om",            MASK_OPTIMIZE_MEMORY},  \
    { "Os",            MASK_OPTIMIZE_SPEED},   \
    { "map1",          MASK_MAP1},             \
    { "map2",          MASK_MAP2},             \
    { "map3",          MASK_MAP3},             \
    { "map4",          MASK_MAP4},             \
    { "ybase-high",    MASK_YBASE_HIGH},       \
    { "init",          MASK_INIT},             \
    { "inline-mult",   MASK_INLINE_MULT},      \
    { "reserve-ybase", MASK_RESERVE_YBASE},    \
    { "",              TARGET_DEFAULT}         \
  }

/* Default target_flags if no switches are specified */
#ifndef TARGET_DEFAULT
#define TARGET_DEFAULT  MASK_OPTIMIZE_MEMORY|MASK_REGPARM|MASK_YBASE_HIGH
#endif

/* This macro is similar to `TARGET_SWITCHES' but defines names of
   command options that have values.  Its definition is an
   initializer with a subgrouping for each command option.

   Each subgrouping contains a string constant, that defines the
   fixed part of the option name, and the address of a variable. 
   The variable, type `char *', is set to the variable part of the
   given option if the fixed part matches.  The actual option name
   is made by appending `-m' to the specified name.

   Here is an example which defines `-mshort-data-NUMBER'.  If the
   given option is `-mshort-data-512', the variable `m88k_short_data'
   will be set to the string `"512"'.

	extern char *m88k_short_data;
	#define TARGET_OPTIONS { { "short-data-", &m88k_short_data } }  */

#define TARGET_OPTIONS						\
{								\
  { "text=",	&text_seg_name	},				\
  { "data=",	&data_seg_name	},				\
  { "bss=",	&bss_seg_name	},				\
  { "const=",   &const_seg_name },                              \
  { "chip=",    &chip_name      }                               \
}

/* Sometimes certain combinations of command options do not make sense
   on a particular target machine.  You can define a macro
   `OVERRIDE_OPTIONS' to take account of this.  This macro, if
   defined, is executed once just after all the command options have
   been parsed. */

#define OVERRIDE_OPTIONS override_options ()

#define OPTIMIZATION_OPTIONS(LEVEL)                   \
{                                                     \
    flag_gnu_linker             = FALSE;              \
                                                      \
    if (LEVEL)                                        \
    {                                                 \
	flag_omit_frame_pointer = TRUE;               \
	flag_thread_jumps       = TRUE;               \
    }                                                 \
                                                      \
    if (LEVEL >= 2)                                   \
    {                                                 \
	flag_strength_reduce         = TRUE;          \
	flag_cse_follow_jumps        = TRUE;          \
	flag_cse_skip_blocks         = TRUE;          \
	flag_expensive_optimizations = TRUE;          \
	flag_rerun_cse_after_loop    = TRUE;          \
    }                                                 \
                                                      \
    if (LEVEL >= 3)                                   \
    {                                                 \
       flag_inline_functions = 1;                     \
    }                                                 \
}

/* STORAGE LAYOUT */

/* Define if you don't want extended real, but do want to use the
   software floating point emulator for REAL_ARITHMETIC and
   decimal <-> binary conversion. */
#define REAL_ARITHMETIC

/* Define this if most significant bit is lowest numbered
   in instructions that operate on numbered bit-fields.
 */
#define BITS_BIG_ENDIAN  1

/* Define this if most significant byte of a word is the lowest numbered.
   We define big-endian, but since the 1600 series cannot address bytes
   it does not matter. */
#define BYTES_BIG_ENDIAN 1