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verified gcc-4.6.4.tar.bz2.sig;
imported gcc-4.6.4 source tree from verified upstream tarball.

downloading a git-generated archive based on the 'upstream' tag
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1 files changed, 385 insertions, 0 deletions

diff --git a/gcc/genattr.c b/gcc/genattr.c
new file mode 100644
index 000000000..acb3a3825
--- /dev/null
+++ b/gcc/genattr.c
@@ -0,0 +1,385 @@
+/* Generate attribute information (insn-attr.h) from machine description.
+   Copyright (C) 1991, 1994, 1996, 1998, 1999, 2000, 2003, 2004, 2007, 2008,
+   2010  Free Software Foundation, Inc.
+   Contributed by Richard Kenner (kenner@vlsi1.ultra.nyu.edu)
+
+This file is part of GCC.
+
+GCC 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 3, or (at your option) any later
+version.
+
+GCC 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 GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+
+#include "bconfig.h"
+#include "system.h"
+#include "coretypes.h"
+#include "tm.h"
+#include "rtl.h"
+#include "errors.h"
+#include "read-md.h"
+#include "gensupport.h"
+
+
+static void write_upcase (const char *);
+static void gen_attr (rtx);
+
+static void
+write_upcase (const char *str)
+{
+  for (; *str; str++)
+    putchar (TOUPPER(*str));
+}
+
+static VEC (rtx, heap) *const_attrs, *reservations;
+
+
+static void
+gen_attr (rtx attr)
+{
+  const char *p, *tag;
+  int is_const = GET_CODE (XEXP (attr, 2)) == CONST;
+
+  if (is_const)
+    VEC_safe_push (rtx, heap, const_attrs, attr);
+
+  printf ("#define HAVE_ATTR_%s\n", XSTR (attr, 0));
+
+  /* If numeric attribute, don't need to write an enum.  */
+  if (GET_CODE (attr) == DEFINE_ENUM_ATTR)
+    printf ("extern enum %s get_attr_%s (%s);\n\n",
+	    XSTR (attr, 1), XSTR (attr, 0), (is_const ? "void" : "rtx"));
+  else
+    {
+      p = XSTR (attr, 1);
+      if (*p == '\0')
+	printf ("extern int get_attr_%s (%s);\n", XSTR (attr, 0),
+		(is_const ? "void" : "rtx"));
+      else
+	{
+	  printf ("enum attr_%s {", XSTR (attr, 0));
+
+	  while ((tag = scan_comma_elt (&p)) != 0)
+	    {
+	      write_upcase (XSTR (attr, 0));
+	      putchar ('_');
+	      while (tag != p)
+		putchar (TOUPPER (*tag++));
+	      if (*p == ',')
+		fputs (", ", stdout);
+	    }
+	  fputs ("};\n", stdout);
+
+	  printf ("extern enum attr_%s get_attr_%s (%s);\n\n",
+		  XSTR (attr, 0), XSTR (attr, 0), (is_const ? "void" : "rtx"));
+	}
+    }
+
+  /* If `length' attribute, write additional function definitions and define
+     variables used by `insn_current_length'.  */
+  if (! strcmp (XSTR (attr, 0), "length"))
+    {
+      puts ("\
+extern void shorten_branches (rtx);\n\
+extern int insn_default_length (rtx);\n\
+extern int insn_min_length (rtx);\n\
+extern int insn_variable_length_p (rtx);\n\
+extern int insn_current_length (rtx);\n\n\
+#include \"insn-addr.h\"\n");
+    }
+}
+
+/* Check that attribute NAME is used in define_insn_reservation condition
+   EXP.  Return true if it is.  */
+static bool
+check_tune_attr (const char *name, rtx exp)
+{
+  switch (GET_CODE (exp))
+    {
+    case AND:
+      if (check_tune_attr (name, XEXP (exp, 0)))
+	return true;
+      return check_tune_attr (name, XEXP (exp, 1));
+
+    case IOR:
+      return (check_tune_attr (name, XEXP (exp, 0))
+	      && check_tune_attr (name, XEXP (exp, 1)));
+
+    case EQ_ATTR:
+      return strcmp (XSTR (exp, 0), name) == 0;
+
+    default:
+      return false;
+    }
+}
+
+/* Try to find a const attribute (usually cpu or tune) that is used
+   in all define_insn_reservation conditions.  */
+static bool
+find_tune_attr (rtx exp)
+{
+  unsigned int i;
+  rtx attr;
+
+  switch (GET_CODE (exp))
+    {
+    case AND:
+    case IOR:
+      if (find_tune_attr (XEXP (exp, 0)))
+	return true;
+      return find_tune_attr (XEXP (exp, 1));
+
+    case EQ_ATTR:
+      if (strcmp (XSTR (exp, 0), "alternative") == 0)
+	return false;
+
+      FOR_EACH_VEC_ELT (rtx, const_attrs, i, attr)
+	if (strcmp (XSTR (attr, 0), XSTR (exp, 0)) == 0)
+	  {
+	    unsigned int j;
+	    rtx resv;
+
+	    FOR_EACH_VEC_ELT (rtx, reservations, j, resv)
+	      if (! check_tune_attr (XSTR (attr, 0), XEXP (resv, 2)))
+		return false;
+	    return true;
+	  }
+      return false;
+
+    default:
+      return false;
+    }
+}
+
+int
+main (int argc, char **argv)
+{
+  rtx desc;
+  int have_delay = 0;
+  int have_annul_true = 0;
+  int have_annul_false = 0;
+  int num_insn_reservations = 0;
+  int i;
+
+  progname = "genattr";
+
+  if (!init_rtx_reader_args (argc, argv))
+    return (FATAL_EXIT_CODE);
+
+  puts ("/* Generated automatically by the program `genattr'");
+  puts ("   from the machine description file `md'.  */\n");
+  puts ("#ifndef GCC_INSN_ATTR_H");
+  puts ("#define GCC_INSN_ATTR_H\n");
+
+  /* For compatibility, define the attribute `alternative', which is just
+     a reference to the variable `which_alternative'.  */
+
+  puts ("#define HAVE_ATTR_alternative");
+  puts ("#define get_attr_alternative(insn) which_alternative");
+
+  /* Read the machine description.  */
+
+  while (1)
+    {
+      int line_no, insn_code_number;
+
+      desc = read_md_rtx (&line_no, &insn_code_number);
+      if (desc == NULL)
+	break;
+
+      if (GET_CODE (desc) == DEFINE_ATTR
+	  || GET_CODE (desc) == DEFINE_ENUM_ATTR)
+	gen_attr (desc);
+
+      else if (GET_CODE (desc) == DEFINE_DELAY)
+        {
+	  if (! have_delay)
+	    {
+	      printf ("#define DELAY_SLOTS\n");
+	      printf ("extern int num_delay_slots (rtx);\n");
+	      printf ("extern int eligible_for_delay (rtx, int, rtx, int);\n\n");
+	      printf ("extern int const_num_delay_slots (rtx);\n\n");
+	      have_delay = 1;
+	    }
+
+	  for (i = 0; i < XVECLEN (desc, 1); i += 3)
+	    {
+	      if (XVECEXP (desc, 1, i + 1) && ! have_annul_true)
+		{
+		  printf ("#define ANNUL_IFTRUE_SLOTS\n");
+		  printf ("extern int eligible_for_annul_true (rtx, int, rtx, int);\n");
+		  have_annul_true = 1;
+		}
+
+	      if (XVECEXP (desc, 1, i + 2) && ! have_annul_false)
+		{
+		  printf ("#define ANNUL_IFFALSE_SLOTS\n");
+		  printf ("extern int eligible_for_annul_false (rtx, int, rtx, int);\n");
+		  have_annul_false = 1;
+		}
+	    }
+        }
+
+      else if (GET_CODE (desc) == DEFINE_INSN_RESERVATION)
+	{
+	  num_insn_reservations++;
+	  VEC_safe_push (rtx, heap, reservations, desc);
+	}
+    }
+
+  if (num_insn_reservations > 0)
+    {
+      bool has_tune_attr
+	= find_tune_attr (XEXP (VEC_index (rtx, reservations, 0), 2));
+      /* Output interface for pipeline hazards recognition based on
+	 DFA (deterministic finite state automata.  */
+      printf ("\n#define INSN_SCHEDULING\n");
+      printf ("\n/* DFA based pipeline interface.  */");
+      printf ("\n#ifndef AUTOMATON_ALTS\n");
+      printf ("#define AUTOMATON_ALTS 0\n");
+      printf ("#endif\n\n");
+      printf ("\n#ifndef AUTOMATON_STATE_ALTS\n");
+      printf ("#define AUTOMATON_STATE_ALTS 0\n");
+      printf ("#endif\n\n");
+      printf ("#ifndef CPU_UNITS_QUERY\n");
+      printf ("#define CPU_UNITS_QUERY 0\n");
+      printf ("#endif\n\n");
+      /* Interface itself: */
+      if (has_tune_attr)
+	{
+	  printf ("/* Initialize fn pointers for internal_dfa_insn_code\n");
+	  printf ("   and insn_default_latency.  */\n");
+	  printf ("extern void init_sched_attrs (void);\n\n");
+	  printf ("/* Internal insn code number used by automata.  */\n");
+	  printf ("extern int (*internal_dfa_insn_code) (rtx);\n\n");
+	  printf ("/* Insn latency time defined in define_insn_reservation. */\n");
+	  printf ("extern int (*insn_default_latency) (rtx);\n\n");
+	}
+      else
+	{
+	  printf ("#define init_sched_attrs() do { } while (0)\n\n");
+	  printf ("/* Internal insn code number used by automata.  */\n");
+	  printf ("extern int internal_dfa_insn_code (rtx);\n\n");
+	  printf ("/* Insn latency time defined in define_insn_reservation. */\n");
+	  printf ("extern int insn_default_latency (rtx);\n\n");
+	}
+      printf ("/* Return nonzero if there is a bypass for given insn\n");
+      printf ("   which is a data producer.  */\n");
+      printf ("extern int bypass_p (rtx);\n\n");
+      printf ("/* Insn latency time on data consumed by the 2nd insn.\n");
+      printf ("   Use the function if bypass_p returns nonzero for\n");
+      printf ("   the 1st insn. */\n");
+      printf ("extern int insn_latency (rtx, rtx);\n\n");
+      printf ("/* Maximal insn latency time possible of all bypasses for this insn.\n");
+      printf ("   Use the function if bypass_p returns nonzero for\n");
+      printf ("   the 1st insn. */\n");
+      printf ("extern int maximal_insn_latency (rtx);\n\n");
+      printf ("\n#if AUTOMATON_ALTS\n");
+      printf ("/* The following function returns number of alternative\n");
+      printf ("   reservations of given insn.  It may be used for better\n");
+      printf ("   insns scheduling heuristics. */\n");
+      printf ("extern int insn_alts (rtx);\n\n");
+      printf ("#endif\n\n");
+      printf ("/* Maximal possible number of insns waiting results being\n");
+      printf ("   produced by insns whose execution is not finished. */\n");
+      printf ("extern const int max_insn_queue_index;\n\n");
+      printf ("/* Pointer to data describing current state of DFA.  */\n");
+      printf ("typedef void *state_t;\n\n");
+      printf ("/* Size of the data in bytes.  */\n");
+      printf ("extern int state_size (void);\n\n");
+      printf ("/* Initiate given DFA state, i.e. Set up the state\n");
+      printf ("   as all functional units were not reserved.  */\n");
+      printf ("extern void state_reset (state_t);\n");
+      printf ("/* The following function returns negative value if given\n");
+      printf ("   insn can be issued in processor state described by given\n");
+      printf ("   DFA state.  In this case, the DFA state is changed to\n");
+      printf ("   reflect the current and future reservations by given\n");
+      printf ("   insn.  Otherwise the function returns minimal time\n");
+      printf ("   delay to issue the insn.  This delay may be zero\n");
+      printf ("   for superscalar or VLIW processors.  If the second\n");
+      printf ("   parameter is NULL the function changes given DFA state\n");
+      printf ("   as new processor cycle started.  */\n");
+      printf ("extern int state_transition (state_t, rtx);\n");
+      printf ("\n#if AUTOMATON_STATE_ALTS\n");
+      printf ("/* The following function returns number of possible\n");
+      printf ("   alternative reservations of given insn in given\n");
+      printf ("   DFA state.  It may be used for better insns scheduling\n");
+      printf ("   heuristics.  By default the function is defined if\n");
+      printf ("   macro AUTOMATON_STATE_ALTS is defined because its\n");
+      printf ("   implementation may require much memory.  */\n");
+      printf ("extern int state_alts (state_t, rtx);\n");
+      printf ("#endif\n\n");
+      printf ("extern int min_issue_delay (state_t, rtx);\n");
+      printf ("/* The following function returns nonzero if no one insn\n");
+      printf ("   can be issued in current DFA state. */\n");
+      printf ("extern int state_dead_lock_p (state_t);\n");
+      printf ("/* The function returns minimal delay of issue of the 2nd\n");
+      printf ("   insn after issuing the 1st insn in given DFA state.\n");
+      printf ("   The 1st insn should be issued in given state (i.e.\n");
+      printf ("    state_transition should return negative value for\n");
+      printf ("    the insn and the state).  Data dependencies between\n");
+      printf ("    the insns are ignored by the function.  */\n");
+      printf
+	("extern int min_insn_conflict_delay (state_t, rtx, rtx);\n");
+      printf ("/* The following function outputs reservations for given\n");
+      printf ("   insn as they are described in the corresponding\n");
+      printf ("   define_insn_reservation.  */\n");
+      printf ("extern void print_reservation (FILE *, rtx);\n");
+      printf ("\n#if CPU_UNITS_QUERY\n");
+      printf ("/* The following function returns code of functional unit\n");
+      printf ("   with given name (see define_cpu_unit). */\n");
+      printf ("extern int get_cpu_unit_code (const char *);\n");
+      printf ("/* The following function returns nonzero if functional\n");
+      printf ("   unit with given code is currently reserved in given\n");
+      printf ("   DFA state.  */\n");
+      printf ("extern int cpu_unit_reservation_p (state_t, int);\n");
+      printf ("#endif\n\n");
+      printf ("/* The following function returns true if insn\n");
+      printf ("   has a dfa reservation.  */\n");
+      printf ("extern bool insn_has_dfa_reservation_p (rtx);\n\n");
+      printf ("/* Clean insn code cache.  It should be called if there\n");
+      printf ("   is a chance that condition value in a\n");
+      printf ("   define_insn_reservation will be changed after\n");
+      printf ("   last call of dfa_start.  */\n");
+      printf ("extern void dfa_clean_insn_cache (void);\n\n");
+      printf ("extern void dfa_clear_single_insn_cache (rtx);\n\n");
+      printf ("/* Initiate and finish work with DFA.  They should be\n");
+      printf ("   called as the first and the last interface\n");
+      printf ("   functions.  */\n");
+      printf ("extern void dfa_start (void);\n");
+      printf ("extern void dfa_finish (void);\n");
+    }
+  else
+    {
+      /* Otherwise we do no scheduling, but we need these typedefs
+	 in order to avoid uglifying other code with more ifdefs.  */
+      printf ("typedef void *state_t;\n\n");
+    }
+
+  /* Output flag masks for use by reorg.
+
+     Flags are used to hold branch direction and prediction information
+     for use by eligible_for_...  */
+  printf("\n#define ATTR_FLAG_forward\t0x1\n");
+  printf("#define ATTR_FLAG_backward\t0x2\n");
+  printf("#define ATTR_FLAG_likely\t0x4\n");
+  printf("#define ATTR_FLAG_very_likely\t0x8\n");
+  printf("#define ATTR_FLAG_unlikely\t0x10\n");
+  printf("#define ATTR_FLAG_very_unlikely\t0x20\n");
+
+  puts("\n#endif /* GCC_INSN_ATTR_H */");
+
+  if (ferror (stdout) || fflush (stdout) || fclose (stdout))
+    return FATAL_EXIT_CODE;
+
+  return SUCCESS_EXIT_CODE;
+}