pa.c

linux下的gcc编译器

/* Subroutines for insn-output.c for HPPA.
   Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
   2002, 2003 Free Software Foundation, Inc.
   Contributed by Tim Moore ([e-mail]), based on sparc.c

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 2, 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.  */

#include "config.h"
#include "system.h"
#include "rtl.h"
#include "regs.h"
#include "hard-reg-set.h"
#include "real.h"
#include "insn-config.h"
#include "conditions.h"
#include "insn-attr.h"
#include "flags.h"
#include "tree.h"
#include "output.h"
#include "except.h"
#include "expr.h"
#include "optabs.h"
#include "libfuncs.h"
#include "reload.h"
#include "c-tree.h"
#include "integrate.h"
#include "function.h"
#include "obstack.h"
#include "toplev.h"
#include "ggc.h"
#include "recog.h"
#include "predict.h"
#include "tm_p.h"
#include "target.h"
#include "target-def.h"

static int hppa_use_dfa_pipeline_interface PARAMS ((void));

#undef TARGET_SCHED_USE_DFA_PIPELINE_INTERFACE 
#define TARGET_SCHED_USE_DFA_PIPELINE_INTERFACE hppa_use_dfa_pipeline_interface

static int
hppa_use_dfa_pipeline_interface ()
{
  return 1;
}

/* Return nonzero if there is a bypass for the output of 
   OUT_INSN and the fp store IN_INSN.  */
int
hppa_fpstore_bypass_p (out_insn, in_insn)
     rtx out_insn, in_insn;
{
  enum machine_mode store_mode;
  enum machine_mode other_mode;
  rtx set;

  if (recog_memoized (in_insn) < 0
      || get_attr_type (in_insn) != TYPE_FPSTORE
      || recog_memoized (out_insn) < 0)
    return 0;

  store_mode = GET_MODE (SET_SRC (PATTERN (in_insn)));

  set = single_set (out_insn);
  if (!set)
    return 0;

  other_mode = GET_MODE (SET_SRC (set));

  return (GET_MODE_SIZE (store_mode) == GET_MODE_SIZE (other_mode));
}
  

#ifndef DO_FRAME_NOTES
#ifdef INCOMING_RETURN_ADDR_RTX
#define DO_FRAME_NOTES 1
#else
#define DO_FRAME_NOTES 0
#endif
#endif

static inline rtx force_mode PARAMS ((enum machine_mode, rtx));
static void pa_combine_instructions PARAMS ((rtx));
static int pa_can_combine_p PARAMS ((rtx, rtx, rtx, int, rtx, rtx, rtx));
static int forward_branch_p PARAMS ((rtx));
static int shadd_constant_p PARAMS ((int));
static void compute_zdepwi_operands PARAMS ((unsigned HOST_WIDE_INT, unsigned *));
static int compute_movstrsi_length PARAMS ((rtx));
static bool pa_assemble_integer PARAMS ((rtx, unsigned int, int));
static void remove_useless_addtr_insns PARAMS ((rtx, int));
static void store_reg PARAMS ((int, int, int));
static void store_reg_modify PARAMS ((int, int, int));
static void load_reg PARAMS ((int, int, int));
static void set_reg_plus_d PARAMS ((int, int, int, int));
static void pa_output_function_prologue PARAMS ((FILE *, HOST_WIDE_INT));
static void pa_output_function_epilogue PARAMS ((FILE *, HOST_WIDE_INT));
static int pa_adjust_cost PARAMS ((rtx, rtx, rtx, int));
static int pa_adjust_priority PARAMS ((rtx, int));
static int pa_issue_rate PARAMS ((void));
static void pa_select_section PARAMS ((tree, int, unsigned HOST_WIDE_INT))
     ATTRIBUTE_UNUSED;
static void pa_encode_section_info PARAMS ((tree, int));
static const char *pa_strip_name_encoding PARAMS ((const char *));
static void pa_globalize_label PARAMS ((FILE *, const char *))
     ATTRIBUTE_UNUSED;
static void pa_asm_output_mi_thunk PARAMS ((FILE *, tree, HOST_WIDE_INT,
					    HOST_WIDE_INT, tree));
#if !defined(USE_COLLECT2)
static void pa_asm_out_constructor PARAMS ((rtx, int));
static void pa_asm_out_destructor PARAMS ((rtx, int));
#endif
static void pa_init_builtins PARAMS ((void));
static void copy_fp_args PARAMS ((rtx)) ATTRIBUTE_UNUSED;
static int length_fp_args PARAMS ((rtx)) ATTRIBUTE_UNUSED;
static struct deferred_plabel *get_plabel PARAMS ((const char *))
     ATTRIBUTE_UNUSED;

/* Save the operands last given to a compare for use when we
   generate a scc or bcc insn.  */
rtx hppa_compare_op0, hppa_compare_op1;
enum cmp_type hppa_branch_type;

/* Which cpu we are scheduling for.  */
enum processor_type pa_cpu;

/* String to hold which cpu we are scheduling for.  */
const char *pa_cpu_string;

/* Which architecture we are generating code for.  */
enum architecture_type pa_arch;

/* String to hold which architecture we are generating code for.  */
const char *pa_arch_string;

/* Counts for the number of callee-saved general and floating point
   registers which were saved by the current function's prologue.  */
static int gr_saved, fr_saved;

static rtx find_addr_reg PARAMS ((rtx));

/* Keep track of the number of bytes we have output in the CODE subspaces
   during this compilation so we'll know when to emit inline long-calls.  */
unsigned long total_code_bytes;

/* Variables to handle plabels that we discover are necessary at assembly
   output time.  They are output after the current function.  */
struct deferred_plabel GTY(())
{
  rtx internal_label;
  const char *name;
};
static GTY((length ("n_deferred_plabels"))) struct deferred_plabel *
  deferred_plabels;
static size_t n_deferred_plabels = 0;

/* Initialize the GCC target structure.  */

#undef TARGET_ASM_ALIGNED_HI_OP
#define TARGET_ASM_ALIGNED_HI_OP "\t.half\t"
#undef TARGET_ASM_ALIGNED_SI_OP
#define TARGET_ASM_ALIGNED_SI_OP "\t.word\t"
#undef TARGET_ASM_ALIGNED_DI_OP
#define TARGET_ASM_ALIGNED_DI_OP "\t.dword\t"
#undef TARGET_ASM_UNALIGNED_HI_OP
#define TARGET_ASM_UNALIGNED_HI_OP TARGET_ASM_ALIGNED_HI_OP
#undef TARGET_ASM_UNALIGNED_SI_OP
#define TARGET_ASM_UNALIGNED_SI_OP TARGET_ASM_ALIGNED_SI_OP
#undef TARGET_ASM_UNALIGNED_DI_OP
#define TARGET_ASM_UNALIGNED_DI_OP TARGET_ASM_ALIGNED_DI_OP
#undef TARGET_ASM_INTEGER
#define TARGET_ASM_INTEGER pa_assemble_integer

#undef TARGET_ASM_FUNCTION_PROLOGUE
#define TARGET_ASM_FUNCTION_PROLOGUE pa_output_function_prologue
#undef TARGET_ASM_FUNCTION_EPILOGUE
#define TARGET_ASM_FUNCTION_EPILOGUE pa_output_function_epilogue

#undef TARGET_SCHED_ADJUST_COST
#define TARGET_SCHED_ADJUST_COST pa_adjust_cost
#undef TARGET_SCHED_ADJUST_PRIORITY
#define TARGET_SCHED_ADJUST_PRIORITY pa_adjust_priority
#undef TARGET_SCHED_ISSUE_RATE
#define TARGET_SCHED_ISSUE_RATE pa_issue_rate

#undef TARGET_ENCODE_SECTION_INFO
#define TARGET_ENCODE_SECTION_INFO pa_encode_section_info
#undef TARGET_STRIP_NAME_ENCODING
#define TARGET_STRIP_NAME_ENCODING pa_strip_name_encoding

#undef TARGET_ASM_OUTPUT_MI_THUNK
#define TARGET_ASM_OUTPUT_MI_THUNK pa_asm_output_mi_thunk
#undef TARGET_ASM_CAN_OUTPUT_MI_THUNK
#define TARGET_ASM_CAN_OUTPUT_MI_THUNK default_can_output_mi_thunk_no_vcall

#if !defined(USE_COLLECT2)
#undef TARGET_ASM_CONSTRUCTOR
#define TARGET_ASM_CONSTRUCTOR pa_asm_out_constructor
#undef TARGET_ASM_DESTRUCTOR
#define TARGET_ASM_DESTRUCTOR pa_asm_out_destructor
#endif

#undef TARGET_INIT_BUILTINS
#define TARGET_INIT_BUILTINS pa_init_builtins

struct gcc_target targetm = TARGET_INITIALIZER;

void
override_options ()
{
  if (pa_cpu_string == NULL)
    pa_cpu_string = TARGET_SCHED_DEFAULT;

  if (! strcmp (pa_cpu_string, "8000"))
    {
      pa_cpu_string = "8000";
      pa_cpu = PROCESSOR_8000;
    }
  else if (! strcmp (pa_cpu_string, "7100"))
    {
      pa_cpu_string = "7100";
      pa_cpu = PROCESSOR_7100;
    }
  else if (! strcmp (pa_cpu_string, "700"))
    {
      pa_cpu_string = "700";
      pa_cpu = PROCESSOR_700;
    }
  else if (! strcmp (pa_cpu_string, "7100LC"))
    {
      pa_cpu_string = "7100LC";
      pa_cpu = PROCESSOR_7100LC;
    }
  else if (! strcmp (pa_cpu_string, "7200"))
    {
      pa_cpu_string = "7200";
      pa_cpu = PROCESSOR_7200;
    }
  else if (! strcmp (pa_cpu_string, "7300"))
    {
      pa_cpu_string = "7300";
      pa_cpu = PROCESSOR_7300;
    }
  else
    {
      warning ("unknown -mschedule= option (%s).\nValid options are 700, 7100, 7100LC, 7200, 7300, and 8000\n", pa_cpu_string);
    }

  /* Set the instruction set architecture.  */
  if (pa_arch_string && ! strcmp (pa_arch_string, "1.0"))
    {
      pa_arch_string = "1.0";
      pa_arch = ARCHITECTURE_10;
      target_flags &= ~(MASK_PA_11 | MASK_PA_20);
    }
  else if (pa_arch_string && ! strcmp (pa_arch_string, "1.1"))
    {
      pa_arch_string = "1.1";
      pa_arch = ARCHITECTURE_11;
      target_flags &= ~MASK_PA_20;
      target_flags |= MASK_PA_11;
    }
  else if (pa_arch_string && ! strcmp (pa_arch_string, "2.0"))
    {
      pa_arch_string = "2.0";
      pa_arch = ARCHITECTURE_20;
      target_flags |= MASK_PA_11 | MASK_PA_20;
    }
  else if (pa_arch_string)
    {
      warning ("unknown -march= option (%s).\nValid options are 1.0, 1.1, and 2.0\n", pa_arch_string);
    }

  /* Unconditional branches in the delay slot are not compatible with dwarf2
     call frame information.  There is no benefit in using this optimization
     on PA8000 and later processors.  */
  if (pa_cpu >= PROCESSOR_8000
      || (! USING_SJLJ_EXCEPTIONS && flag_exceptions)
      || flag_unwind_tables)
    target_flags &= ~MASK_JUMP_IN_DELAY;

  if (flag_pic && TARGET_PORTABLE_RUNTIME)
    {
      warning ("PIC code generation is not supported in the portable runtime model\n");
    }

  if (flag_pic && TARGET_FAST_INDIRECT_CALLS)
   {
      warning ("PIC code generation is not compatible with fast indirect calls\n");
   }

  if (! TARGET_GAS && write_symbols != NO_DEBUG)
    {
      warning ("-g is only supported when using GAS on this processor,");
      warning ("-g option disabled");
      write_symbols = NO_DEBUG;
    }

  /* We only support the "big PIC" model now.  And we always generate PIC
     code when in 64bit mode.  */
  if (flag_pic == 1 || TARGET_64BIT)
    flag_pic = 2;

  /* We can't guarantee that .dword is available for 32-bit targets.  */
  if (UNITS_PER_WORD == 4)
    targetm.asm_out.aligned_op.di = NULL;

  /* The unaligned ops are only available when using GAS.  */
  if (!TARGET_GAS)
    {
      targetm.asm_out.unaligned_op.hi = NULL;
      targetm.asm_out.unaligned_op.si = NULL;
      targetm.asm_out.unaligned_op.di = NULL;
    }
}

static void
pa_init_builtins ()
{
#ifdef DONT_HAVE_FPUTC_UNLOCKED
  built_in_decls[(int) BUILT_IN_FPUTC_UNLOCKED] = NULL_TREE;
#endif
}

/* Return nonzero only if OP is a register of mode MODE,
   or CONST0_RTX.  */
int
reg_or_0_operand (op, mode)
     rtx op;
     enum machine_mode mode;
{
  return (op == CONST0_RTX (mode) || register_operand (op, mode));
}

/* Return nonzero if OP is suitable for use in a call to a named
   function.

   For 2.5 try to eliminate either call_operand_address or
   function_label_operand, they perform very similar functions.  */
int
call_operand_address (op, mode)
     rtx op;
     enum machine_mode mode ATTRIBUTE_UNUSED;
{
  return (GET_MODE (op) == word_mode
	  && CONSTANT_P (op) && ! TARGET_PORTABLE_RUNTIME);
}

/* Return 1 if X contains a symbolic expression.  We know these
   expressions will have one of a few well defined forms, so
   we need only check those forms.  */
int
symbolic_expression_p (x)
     register rtx x;
{

  /* Strip off any HIGH.  */
  if (GET_CODE (x) == HIGH)
    x = XEXP (x, 0);

  return (symbolic_operand (x, VOIDmode));
}

int
symbolic_operand (op, mode)
     register rtx op;
     enum machine_mode mode ATTRIBUTE_UNUSED;
{
  switch (GET_CODE (op))
    {
    case SYMBOL_REF:
    case LABEL_REF:
      return 1;
    case CONST:
      op = XEXP (op, 0);
      return ((GET_CODE (XEXP (op, 0)) == SYMBOL_REF
	       || GET_CODE (XEXP (op, 0)) == LABEL_REF)
	      && GET_CODE (XEXP (op, 1)) == CONST_INT);
    default:
      return 0;
    }
}

/* Return truth value of statement that OP is a symbolic memory
   operand of mode MODE.  */

int
symbolic_memory_operand (op, mode)
     rtx op;
     enum machine_mode mode ATTRIBUTE_UNUSED;
{
  if (GET_CODE (op) == SUBREG)
    op = SUBREG_REG (op);
  if (GET_CODE (op) != MEM)
    return 0;
  op = XEXP (op, 0);
  return (GET_CODE (op) == SYMBOL_REF || GET_CODE (op) == CONST
	  || GET_CODE (op) == HIGH || GET_CODE (op) == LABEL_REF);
}

/* Return 1 if the operand is either a register or a memory operand that is
   not symbolic.  */

int
reg_or_nonsymb_mem_operand (op, mode)
    register rtx op;
    enum machine_mode mode;
{
  if (register_operand (op, mode))
    return 1;

  if (memory_operand (op, mode) && ! symbolic_memory_operand (op, mode))
    return 1;

  return 0;
}

/* Return 1 if the operand is either a register, zero, or a memory operand
   that is not symbolic.  */

int
reg_or_0_or_nonsymb_mem_operand (op, mode)
    register rtx op;
    enum machine_mode mode;
{
  if (register_operand (op, mode))
    return 1;