* config/host-hpux.c: Change copyright header to refer to version 3 of the GNU

[pf3gnuchains/gcc-fork.git] / gcc / cfgloop.h

diff --git a/gcc/cfgloop.h b/gcc/cfgloop.h
index 15d5589..903672d 100644 (file)
--- a/gcc/cfgloop.h
+++ b/gcc/cfgloop.h
@@ -1,12 +1,12 @@
 /* Natural loop functions
 /* Natural loop functions

-   Copyright (C) 1987, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
-   Free Software Foundation, Inc.
+   Copyright (C) 1987, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
+   2005, 2006, 2007  Free Software Foundation, Inc.

 
 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
 
 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 2, or (at your option) any later
+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
 version.
 
 GCC is distributed in the hope that it will be useful, but WITHOUT ANY


@@ -15,9 +15,8 @@ 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
 for more details.
 
 You should have received a copy of the GNU General Public License

-along with GCC; see the file COPYING.  If not, write to the Free
-Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
-02110-1301, USA.  */
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */

 
 #ifndef GCC_CFGLOOP_H
 #define GCC_CFGLOOP_H
 
 #ifndef GCC_CFGLOOP_H
 #define GCC_CFGLOOP_H


@@ -26,6 +25,7 @@ Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
 /* For rtx_code.  */
 #include "rtl.h"
 #include "vecprim.h"
 /* For rtx_code.  */
 #include "rtl.h"
 #include "vecprim.h"

+#include "double-int.h"

 
 /* Structure to hold decision about unrolling/peeling.  */
 enum lpt_dec
 
 /* Structure to hold decision about unrolling/peeling.  */
 enum lpt_dec


@@ -38,7 +38,7 @@ enum lpt_dec
   LPT_UNROLL_STUPID
 };
 
   LPT_UNROLL_STUPID
 };
 

-struct lpt_decision
+struct lpt_decision GTY (())

 {
   enum lpt_dec decision;
   unsigned times;
 {
   enum lpt_dec decision;
   unsigned times;


@@ -46,7 +46,7 @@ struct lpt_decision
 
 /* The structure describing a bound on number of iterations of a loop.  */
 
 
 /* The structure describing a bound on number of iterations of a loop.  */
 

-struct nb_iter_bound
+struct nb_iter_bound GTY ((chain_next ("%h.next")))

 {
   /* The statement STMT is executed at most ...  */
   tree stmt;
 {
   /* The statement STMT is executed at most ...  */
   tree stmt;


@@ -71,10 +71,10 @@ struct nb_iter_bound
 
 /* Description of the loop exit.  */
 
 
 /* Description of the loop exit.  */
 

-struct loop_exit
+struct loop_exit GTY (())

 {
   /* The exit edge.  */
 {
   /* The exit edge.  */

-  edge e;
+  struct edge_def *e;

 
   /* Previous and next exit in the list of the exits of the loop.  */
   struct loop_exit *prev;
 
   /* Previous and next exit in the list of the exits of the loop.  */
   struct loop_exit *prev;


@@ -84,17 +84,32 @@ struct loop_exit
   struct loop_exit *next_e;
 };
 
   struct loop_exit *next_e;
 };
 

+typedef struct loop *loop_p;
+DEF_VEC_P (loop_p);
+DEF_VEC_ALLOC_P (loop_p, heap);
+DEF_VEC_ALLOC_P (loop_p, gc);
+
+/* An integer estimation of the number of iterations.  Estimate_state
+   describes what is the state of the estimation.  */
+enum loop_estimation
+{
+  /* Estimate was not computed yet.  */
+  EST_NOT_COMPUTED,
+  /* Estimate is ready.  */
+  EST_AVAILABLE
+};
+

 /* Structure to hold information for each natural loop.  */
 /* Structure to hold information for each natural loop.  */

-struct loop
+struct loop GTY ((chain_next ("%h.next")))

 {
   /* Index into loops array.  */
   int num;
 
   /* Basic block of loop header.  */
 {
   /* Index into loops array.  */
   int num;
 
   /* Basic block of loop header.  */

-  basic_block header;
+  struct basic_block_def *header;

 
   /* Basic block of loop latch.  */
 
   /* Basic block of loop latch.  */

-  basic_block latch;
+  struct basic_block_def *latch;

 
   /* For loop unrolling/peeling decision.  */
   struct lpt_decision lpt_decision;
 
   /* For loop unrolling/peeling decision.  */
   struct lpt_decision lpt_decision;


@@ -108,14 +123,8 @@ struct loop
   /* Number of blocks contained within the loop.  */
   unsigned num_nodes;
 
   /* Number of blocks contained within the loop.  */
   unsigned num_nodes;
 

-  /* The loop nesting depth.  */
-  int depth;
-
-  /* Superloops of the loop.  */
-  struct loop **pred;
-
-  /* The outer (parent) loop or NULL if outermost loop.  */
-  struct loop *outer;
+  /* Superloops of the loop, starting with the outermost loop.  */
+  VEC (loop_p, gc) *superloops;

 
   /* The first inner (child) loop or NULL if innermost loop.  */
   struct loop *inner;
 
   /* The first inner (child) loop or NULL if innermost loop.  */
   struct loop *inner;


@@ -123,11 +132,8 @@ struct loop
   /* Link to the next (sibling) loop.  */
   struct loop *next;
 
   /* Link to the next (sibling) loop.  */
   struct loop *next;
 

-  /* Loop that is copy of this loop.  */
-  struct loop *copy;
-

   /* Auxiliary info specific to a pass.  */
   /* Auxiliary info specific to a pass.  */

-  void *aux;
+  PTR GTY ((skip (""))) aux;

 
   /* The number of times the latch of the loop is executed.
      This is an INTEGER_CST or an expression containing symbolic
 
   /* The number of times the latch of the loop is executed.
      This is an INTEGER_CST or an expression containing symbolic


@@ -138,13 +144,7 @@ struct loop
 
   /* An integer estimation of the number of iterations.  Estimate_state
      describes what is the state of the estimation.  */
 
   /* An integer estimation of the number of iterations.  Estimate_state
      describes what is the state of the estimation.  */

-  enum
-    {
-      /* Estimate was not computed yet.  */
-      EST_NOT_COMPUTED,
-      /* Estimate is ready.  */
-      EST_AVAILABLE
-    } estimate_state;
+  enum loop_estimation estimate_state;

 
   /* An integer guaranteed to bound the number of iterations of the loop
      from above.  */
 
   /* An integer guaranteed to bound the number of iterations of the loop
      from above.  */


@@ -159,7 +159,7 @@ struct loop
   struct nb_iter_bound *bounds;
 
   /* Head of the cyclic list of the exits of the loop.  */
   struct nb_iter_bound *bounds;
 
   /* Head of the cyclic list of the exits of the loop.  */

-  struct loop_exit exits;
+  struct loop_exit *exits;

 };
 
 /* Flags for state of loop structure.  */
 };
 
 /* Flags for state of loop structure.  */


@@ -170,30 +170,27 @@ enum
   LOOPS_HAVE_MARKED_IRREDUCIBLE_REGIONS = 4,
   LOOPS_HAVE_RECORDED_EXITS = 8,
   LOOPS_MAY_HAVE_MULTIPLE_LATCHES = 16,
   LOOPS_HAVE_MARKED_IRREDUCIBLE_REGIONS = 4,
   LOOPS_HAVE_RECORDED_EXITS = 8,
   LOOPS_MAY_HAVE_MULTIPLE_LATCHES = 16,

-  LOOP_CLOSED_SSA = 32
+  LOOP_CLOSED_SSA = 32,
+  LOOPS_NEED_FIXUP = 64

 };
 
 #define LOOPS_NORMAL (LOOPS_HAVE_PREHEADERS | LOOPS_HAVE_SIMPLE_LATCHES \
                      | LOOPS_HAVE_MARKED_IRREDUCIBLE_REGIONS)
 #define AVOID_CFG_MODIFICATIONS (LOOPS_MAY_HAVE_MULTIPLE_LATCHES)
 
 };
 
 #define LOOPS_NORMAL (LOOPS_HAVE_PREHEADERS | LOOPS_HAVE_SIMPLE_LATCHES \
                      | LOOPS_HAVE_MARKED_IRREDUCIBLE_REGIONS)
 #define AVOID_CFG_MODIFICATIONS (LOOPS_MAY_HAVE_MULTIPLE_LATCHES)
 

-typedef struct loop *loop_p;
-DEF_VEC_P (loop_p);
-DEF_VEC_ALLOC_P (loop_p, heap);
-

 /* Structure to hold CFG information about natural loops within a function.  */
 /* Structure to hold CFG information about natural loops within a function.  */

-struct loops
+struct loops GTY (())

 {
   /* State of loops.  */
   int state;
 
   /* Array of the loops.  */
 {
   /* State of loops.  */
   int state;
 
   /* Array of the loops.  */

-  VEC (loop_p, heap) *larray;
+  VEC (loop_p, gc) *larray;

 
   /* Maps edges to the list of their descriptions as loop exits.  Edges
      whose sources or destinations have loop_father == NULL (which may
      happen during the cfg manipulations) should not appear in EXITS.  */
 
   /* Maps edges to the list of their descriptions as loop exits.  Edges
      whose sources or destinations have loop_father == NULL (which may
      happen during the cfg manipulations) should not appear in EXITS.  */

-  htab_t exits;
+  htab_t GTY((param_is (struct loop_exit))) exits;

 
   /* Pointer to root of loop hierarchy tree.  */
   struct loop *tree_root;
 
   /* Pointer to root of loop hierarchy tree.  */
   struct loop *tree_root;


@@ -256,6 +253,7 @@ enum
   CP_SIMPLE_PREHEADERS = 1
 };
 
   CP_SIMPLE_PREHEADERS = 1
 };
 

+basic_block create_preheader (struct loop *, int);

 extern void create_preheaders (int);
 extern void force_single_succ_latches (void);
 
 extern void create_preheaders (int);
 extern void force_single_succ_latches (void);
 


@@ -388,7 +386,6 @@ extern rtx get_iv_value (struct rtx_iv *, rtx);
 extern bool biv_p (rtx, rtx);
 extern void find_simple_exit (struct loop *, struct niter_desc *);
 extern void iv_analysis_done (void);
 extern bool biv_p (rtx, rtx);
 extern void find_simple_exit (struct loop *, struct niter_desc *);
 extern void iv_analysis_done (void);

-extern struct df *iv_current_loop_df (void);

 
 extern struct niter_desc *get_simple_loop_desc (struct loop *loop);
 extern void free_simple_loop_desc (struct loop *loop);
 
 extern struct niter_desc *get_simple_loop_desc (struct loop *loop);
 extern void free_simple_loop_desc (struct loop *loop);


@@ -409,9 +406,31 @@ get_loop (unsigned num)
   return VEC_index (loop_p, current_loops->larray, num);
 }
 
   return VEC_index (loop_p, current_loops->larray, num);
 }
 

+/* Returns the number of superloops of LOOP.  */
+
+static inline unsigned
+loop_depth (const struct loop *loop)
+{
+  return VEC_length (loop_p, loop->superloops);
+}
+
+/* Returns the immediate superloop of LOOP, or NULL if LOOP is the outermost
+   loop.  */
+
+static inline struct loop *
+loop_outer (const struct loop *loop)
+{
+  unsigned n = VEC_length (loop_p, loop->superloops);
+
+  if (n == 0)
+    return NULL;
+
+  return VEC_index (loop_p, loop->superloops, n - 1);
+}
+

 /* Returns the list of loops in current_loops.  */
 
 /* Returns the list of loops in current_loops.  */
 

-static inline VEC (loop_p, heap) *
+static inline VEC (loop_p, gc) *

 get_loops (void)
 {
   if (!current_loops)
 get_loops (void)
 {
   if (!current_loops)


@@ -518,10 +537,10 @@ fel_init (loop_iterator *li, loop_p *loop, unsigned flags)
                   aloop = aloop->inner)
                continue;
            }
                   aloop = aloop->inner)
                continue;
            }

-         else if (!aloop->outer)
+         else if (!loop_outer (aloop))

            break;
          else
            break;
          else

-           aloop = aloop->outer;
+           aloop = loop_outer (aloop);

        }
     }
   else
        }
     }
   else


@@ -538,7 +557,7 @@ fel_init (loop_iterator *li, loop_p *loop, unsigned flags)
          else
            {
              while (aloop != NULL && aloop->next == NULL)
          else
            {
              while (aloop != NULL && aloop->next == NULL)

-               aloop = aloop->outer;
+               aloop = loop_outer (aloop);

              if (aloop == NULL)
                break;
              aloop = aloop->next;
              if (aloop == NULL)
                break;
              aloop = aloop->next;


@@ -562,18 +581,14 @@ fel_init (loop_iterator *li, loop_p *loop, unsigned flags)
 
 /* The properties of the target.  */
 
 
 /* The properties of the target.  */
 

-extern unsigned target_avail_regs;     /* Number of available registers.  */
-extern unsigned target_res_regs;       /* Number of reserved registers.  */
-extern unsigned target_small_cost;     /* The cost for register when there
-                                          is a free one.  */
-extern unsigned target_pres_cost;      /* The cost for register when there are
-                                          not too many free ones.  */
-extern unsigned target_spill_cost;     /* The cost for register when we need
-                                          to spill.  */
+extern unsigned target_avail_regs;
+extern unsigned target_res_regs;
+extern unsigned target_reg_cost;
+extern unsigned target_spill_cost;

 
 /* Register pressure estimation for induction variable optimizations & loop
    invariant motion.  */
 
 /* Register pressure estimation for induction variable optimizations & loop
    invariant motion.  */

-extern unsigned global_cost_for_size (unsigned, unsigned, unsigned);
+extern unsigned estimate_reg_pressure_cost (unsigned, unsigned);

 extern void init_set_costs (void);
 
 /* Loop optimizer initialization.  */
 extern void init_set_costs (void);
 
 /* Loop optimizer initialization.  */