Imported gcc-4.4.3

[msp430-gcc.git] / gcc / reload.h

diff --git a/gcc/reload.h b/gcc/reload.h
index e832ed98ea4db503e6fc9e0170773a6f4e21fddb..3789680f7cad4a1d1acc4c77cae1f08218242d38 100644 (file)
--- a/gcc/reload.h
+++ b/gcc/reload.h
@@ -1,12 +1,12 @@
-/* Communication between reload.c and reload1.c.
-   Copyright (C) 1987, 1991, 1992, 1993, 1994, 1995, 1997, 1998,
-   1999, 2000, 2001 Free Software Foundation, Inc.
+/* Communication between reload.c, reload1.c and the rest of compiler.
+   Copyright (C) 1987, 1991, 1992, 1993, 1994, 1995, 1997, 1998, 1999,
+   2000, 2001, 2003, 2004, 2007, 2008 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, 59 Temple Place - Suite 330, Boston, MA
-02111-1307, USA.  */
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */

 
 
 /* If secondary reloads are the same for inputs and outputs, define those
 
 
 /* If secondary reloads are the same for inputs and outputs, define those


@@ -30,21 +29,12 @@ Software Foundation, 59 Temple Place - Suite 330, Boston, MA
   SECONDARY_RELOAD_CLASS (CLASS, MODE, X)
 #endif
 
   SECONDARY_RELOAD_CLASS (CLASS, MODE, X)
 #endif
 

-/* If either macro is defined, show that we need secondary reloads.  */
-#if defined(SECONDARY_INPUT_RELOAD_CLASS) || defined(SECONDARY_OUTPUT_RELOAD_CLASS)
-#define HAVE_SECONDARY_RELOADS
-#endif
-

 /* If MEMORY_MOVE_COST isn't defined, give it a default here.  */
 #ifndef MEMORY_MOVE_COST
 /* If MEMORY_MOVE_COST isn't defined, give it a default here.  */
 #ifndef MEMORY_MOVE_COST

-#ifdef HAVE_SECONDARY_RELOADS

 #define MEMORY_MOVE_COST(MODE,CLASS,IN) \
   (4 + memory_move_secondary_cost ((MODE), (CLASS), (IN)))
 #define MEMORY_MOVE_COST(MODE,CLASS,IN) \
   (4 + memory_move_secondary_cost ((MODE), (CLASS), (IN)))

-#else
-#define MEMORY_MOVE_COST(MODE,CLASS,IN) 4
-#endif

 #endif
 #endif

-extern int memory_move_secondary_cost PARAMS ((enum machine_mode, enum reg_class, int));
+extern int memory_move_secondary_cost (enum machine_mode, enum reg_class, int);

 
 /* Maximum number of reloads we can need.  */
 #define MAX_RELOADS (2 * MAX_RECOG_OPERANDS * (MAX_REGS_PER_ADDRESS + 1))
 
 /* Maximum number of reloads we can need.  */
 #define MAX_RELOADS (2 * MAX_RECOG_OPERANDS * (MAX_REGS_PER_ADDRESS + 1))


@@ -68,14 +58,14 @@ extern int memory_move_secondary_cost PARAMS ((enum machine_mode, enum reg_class
                                 reloads; usually secondary reloads
    RELOAD_OTHER                        none of the above, usually multiple uses
    RELOAD_FOR_OTHER_ADDRESS     reload for part of the address of an input
                                 reloads; usually secondary reloads
    RELOAD_OTHER                        none of the above, usually multiple uses
    RELOAD_FOR_OTHER_ADDRESS     reload for part of the address of an input

-                               that is marked RELOAD_OTHER.
+                               that is marked RELOAD_OTHER.

 
    This used to be "enum reload_when_needed" but some debuggers have trouble
    with an enum tag and variable of the same name.  */
 
 enum reload_type
 {
 
    This used to be "enum reload_when_needed" but some debuggers have trouble
    with an enum tag and variable of the same name.  */
 
 enum reload_type
 {

-  RELOAD_FOR_INPUT, RELOAD_FOR_OUTPUT, RELOAD_FOR_INSN, 
+  RELOAD_FOR_INPUT, RELOAD_FOR_OUTPUT, RELOAD_FOR_INSN,

   RELOAD_FOR_INPUT_ADDRESS, RELOAD_FOR_INPADDR_ADDRESS,
   RELOAD_FOR_OUTPUT_ADDRESS, RELOAD_FOR_OUTADDR_ADDRESS,
   RELOAD_FOR_OPERAND_ADDRESS, RELOAD_FOR_OPADDR_ADDR,
   RELOAD_FOR_INPUT_ADDRESS, RELOAD_FOR_INPADDR_ADDRESS,
   RELOAD_FOR_OUTPUT_ADDRESS, RELOAD_FOR_OUTADDR_ADDRESS,
   RELOAD_FOR_OPERAND_ADDRESS, RELOAD_FOR_OPADDR_ADDR,


@@ -93,7 +83,7 @@ struct reload
   rtx out;
 
   /* The class of registers to reload into.  */
   rtx out;
 
   /* The class of registers to reload into.  */

-  enum reg_class class;
+  enum reg_class rclass;

 
   /* The mode this operand should have when reloaded, on input.  */
   enum machine_mode inmode;
 
   /* The mode this operand should have when reloaded, on input.  */
   enum machine_mode inmode;


@@ -147,7 +137,7 @@ struct reload
      addressing an output, for addressing a non-reloaded mem ref, or for
      unspecified purposes (i.e., more than one of the above).  */
   enum reload_type when_needed;
      addressing an output, for addressing a non-reloaded mem ref, or for
      unspecified purposes (i.e., more than one of the above).  */
   enum reload_type when_needed;

-  
+

   /* Nonzero for an optional reload.  Optional reloads are ignored unless the
      value is already sitting in a register.  */
   unsigned int optional:1;
   /* Nonzero for an optional reload.  Optional reloads are ignored unless the
      value is already sitting in a register.  */
   unsigned int optional:1;


@@ -164,10 +154,20 @@ extern struct reload rld[MAX_RELOADS];
 extern int n_reloads;
 #endif
 
 extern int n_reloads;
 #endif
 

+extern GTY (()) VEC(rtx,gc) *reg_equiv_memory_loc_vec;

 extern rtx *reg_equiv_constant;
 extern rtx *reg_equiv_constant;

+extern rtx *reg_equiv_invariant;

 extern rtx *reg_equiv_memory_loc;
 extern rtx *reg_equiv_address;
 extern rtx *reg_equiv_mem;
 extern rtx *reg_equiv_memory_loc;
 extern rtx *reg_equiv_address;
 extern rtx *reg_equiv_mem;

+extern rtx *reg_equiv_alt_mem_list;
+
+/* Element N is the list of insns that initialized reg N from its equivalent
+   constant or memory slot.  */
+extern GTY((length("reg_equiv_init_size"))) rtx *reg_equiv_init;
+
+/* The size of the previous array, for GC purposes.  */
+extern GTY(()) int reg_equiv_init_size;

 
 /* All the "earlyclobber" operands of the current insn
    are recorded here.  */
 
 /* All the "earlyclobber" operands of the current insn
    are recorded here.  */


@@ -192,44 +192,24 @@ extern char double_reg_address_ok;
 
 extern int num_not_at_initial_offset;
 
 
 extern int num_not_at_initial_offset;
 

-struct needs
-{
-  /* [0] is normal, [1] is nongroup.  */
-  short regs[2][N_REG_CLASSES];
-  short groups[N_REG_CLASSES];
-};
-

 #if defined SET_HARD_REG_BIT && defined CLEAR_REG_SET
 /* This structure describes instructions which are relevant for reload.
    Apart from all regular insns, this also includes CODE_LABELs, since they
    must be examined for register elimination.  */
 #if defined SET_HARD_REG_BIT && defined CLEAR_REG_SET
 /* This structure describes instructions which are relevant for reload.
    Apart from all regular insns, this also includes CODE_LABELs, since they
    must be examined for register elimination.  */

-struct insn_chain 
+struct insn_chain

 {
 {

-  /* Links to the neighbour instructions.  */
+  /* Links to the neighbor instructions.  */

   struct insn_chain *next, *prev;
 
   /* Link through a chains set up by calculate_needs_all_insns, containing
      all insns that need reloading.  */
   struct insn_chain *next_need_reload;
 
   struct insn_chain *next, *prev;
 
   /* Link through a chains set up by calculate_needs_all_insns, containing
      all insns that need reloading.  */
   struct insn_chain *next_need_reload;
 

-  /* The basic block this insn is in.  */
-  int block;

   /* The rtx of the insn.  */
   rtx insn;
   /* The rtx of the insn.  */
   rtx insn;

-  /* Register life information: record all live hard registers, and all
-     live pseudos that have a hard register.  */
-  regset_head live_throughout;
-  regset_head dead_or_set;
-
-  /* Copies of the global variables computed by find_reloads.  */
-  struct reload *rld;
-  int n_reloads;

 
 

-  /* Indicates which registers have already been used for spills.  */
-  HARD_REG_SET used_spill_regs;
-
-  /* Describe the needs for reload registers of this insn.  */
-  struct needs need;
+  /* The basic block this insn is in.  */
+  int block;

 
   /* Nonzero if find_reloads said the insn requires reloading.  */
   unsigned int need_reload:1;
 
   /* Nonzero if find_reloads said the insn requires reloading.  */
   unsigned int need_reload:1;


@@ -240,6 +220,19 @@ struct insn_chain
   unsigned int need_elim:1;
   /* Nonzero if this insn was inserted by perform_caller_saves.  */
   unsigned int is_caller_save_insn:1;
   unsigned int need_elim:1;
   /* Nonzero if this insn was inserted by perform_caller_saves.  */
   unsigned int is_caller_save_insn:1;

+
+  /* Register life information: record all live hard registers, and
+     all live pseudos that have a hard register.  This set also
+     contains pseudos spilled by IRA.  */
+  regset_head live_throughout;
+  regset_head dead_or_set;
+
+  /* Copies of the global variables computed by find_reloads.  */
+  struct reload *rld;
+  int n_reloads;
+
+  /* Indicates which registers have already been used for spills.  */
+  HARD_REG_SET used_spill_regs;

 };
 
 /* A chain of insn_chain structures to describe all non-note insns in
 };
 
 /* A chain of insn_chain structures to describe all non-note insns in


@@ -247,141 +240,136 @@ struct insn_chain
 extern struct insn_chain *reload_insn_chain;
 
 /* Allocate a new insn_chain structure.  */
 extern struct insn_chain *reload_insn_chain;
 
 /* Allocate a new insn_chain structure.  */

-extern struct insn_chain *new_insn_chain       PARAMS ((void));
+extern struct insn_chain *new_insn_chain (void);

 
 

-extern void compute_use_by_pseudos             PARAMS ((HARD_REG_SET *, regset));
+extern void compute_use_by_pseudos (HARD_REG_SET *, regset);

 #endif
 
 /* Functions from reload.c:  */
 
 #endif
 
 /* Functions from reload.c:  */
 

-/* Return a memory location that will be used to copy X in mode MODE.  
+extern enum reg_class secondary_reload_class (bool, enum reg_class,
+                                             enum machine_mode, rtx);
+
+#ifdef GCC_INSN_CODES_H
+extern enum reg_class scratch_reload_class (enum insn_code);
+#endif
+
+/* Return a memory location that will be used to copy X in mode MODE.

    If we haven't already made a location for this mode in this insn,
    call find_reloads_address on the location being returned.  */
    If we haven't already made a location for this mode in this insn,
    call find_reloads_address on the location being returned.  */

-extern rtx get_secondary_mem PARAMS ((rtx, enum machine_mode,
-                                   int, enum reload_type));
+extern rtx get_secondary_mem (rtx, enum machine_mode, int, enum reload_type);

 
 /* Clear any secondary memory locations we've made.  */
 
 /* Clear any secondary memory locations we've made.  */

-extern void clear_secondary_mem PARAMS ((void));
+extern void clear_secondary_mem (void);

 
 /* Transfer all replacements that used to be in reload FROM to be in
    reload TO.  */
 
 /* Transfer all replacements that used to be in reload FROM to be in
    reload TO.  */

-extern void transfer_replacements PARAMS ((int, int));
+extern void transfer_replacements (int, int);

 
 /* IN_RTX is the value loaded by a reload that we now decided to inherit,
    or a subpart of it.  If we have any replacements registered for IN_RTX,
 
 /* IN_RTX is the value loaded by a reload that we now decided to inherit,
    or a subpart of it.  If we have any replacements registered for IN_RTX,

-   chancel the reloads that were supposed to load them.
-   Return non-zero if we chanceled any reloads.  */
-extern int remove_address_replacements PARAMS ((rtx in_rtx));
+   cancel the reloads that were supposed to load them.
+   Return nonzero if we canceled any reloads.  */
+extern int remove_address_replacements (rtx in_rtx);

 
 /* Like rtx_equal_p except that it allows a REG and a SUBREG to match
    if they are the same hard reg, and has special hacks for
    autoincrement and autodecrement.  */
 
 /* Like rtx_equal_p except that it allows a REG and a SUBREG to match
    if they are the same hard reg, and has special hacks for
    autoincrement and autodecrement.  */

-extern int operands_match_p PARAMS ((rtx, rtx));
+extern int operands_match_p (rtx, rtx);

 
 /* Return 1 if altering OP will not modify the value of CLOBBER.  */
 
 /* Return 1 if altering OP will not modify the value of CLOBBER.  */

-extern int safe_from_earlyclobber PARAMS ((rtx, rtx));
+extern int safe_from_earlyclobber (rtx, rtx);

 
 /* Search the body of INSN for values that need reloading and record them
    with push_reload.  REPLACE nonzero means record also where the values occur
    so that subst_reloads can be used.  */
 
 /* Search the body of INSN for values that need reloading and record them
    with push_reload.  REPLACE nonzero means record also where the values occur
    so that subst_reloads can be used.  */

-extern int find_reloads PARAMS ((rtx, int, int, int, short *));
+extern int find_reloads (rtx, int, int, int, short *);

 
 /* Compute the sum of X and Y, making canonicalizations assumed in an
    address, namely: sum constant integers, surround the sum of two
    constants with a CONST, put the constant as the second operand, and
    group the constant on the outermost sum.  */
 
 /* Compute the sum of X and Y, making canonicalizations assumed in an
    address, namely: sum constant integers, surround the sum of two
    constants with a CONST, put the constant as the second operand, and
    group the constant on the outermost sum.  */

-extern rtx form_sum PARAMS ((rtx, rtx));
+extern rtx form_sum (rtx, rtx);

 
 /* Substitute into the current INSN the registers into which we have reloaded
    the things that need reloading.  */
 
 /* Substitute into the current INSN the registers into which we have reloaded
    the things that need reloading.  */

-extern void subst_reloads PARAMS ((rtx));
+extern void subst_reloads (rtx);

 
 /* Make a copy of any replacements being done into X and move those copies
    to locations in Y, a copy of X.  We only look at the highest level of
    the RTL.  */
 
 /* Make a copy of any replacements being done into X and move those copies
    to locations in Y, a copy of X.  We only look at the highest level of
    the RTL.  */

-extern void copy_replacements PARAMS ((rtx, rtx));
+extern void copy_replacements (rtx, rtx);

 
 /* Change any replacements being done to *X to be done to *Y */
 
 /* Change any replacements being done to *X to be done to *Y */

-extern void move_replacements PARAMS ((rtx *x, rtx *y));
+extern void move_replacements (rtx *x, rtx *y);

 
 /* If LOC was scheduled to be replaced by something, return the replacement.
    Otherwise, return *LOC.  */
 
 /* If LOC was scheduled to be replaced by something, return the replacement.
    Otherwise, return *LOC.  */

-extern rtx find_replacement PARAMS ((rtx *));
-
-/* Return nonzero if register in range [REGNO, ENDREGNO)
-   appears either explicitly or implicitly in X
-   other than being stored into.  */
-extern int refers_to_regno_for_reload_p PARAMS ((unsigned int, unsigned int,
-                                                rtx, rtx *));
+extern rtx find_replacement (rtx *);

 
 /* Nonzero if modifying X will affect IN.  */
 
 /* Nonzero if modifying X will affect IN.  */

-extern int reg_overlap_mentioned_for_reload_p PARAMS ((rtx, rtx));
-
-/* Return nonzero if anything in X contains a MEM.  Look also for pseudo
-   registers.  */
-extern int refers_to_mem_for_reload_p PARAMS ((rtx));
+extern int reg_overlap_mentioned_for_reload_p (rtx, rtx);

 
 /* Check the insns before INSN to see if there is a suitable register
    containing the same value as GOAL.  */
 
 /* Check the insns before INSN to see if there is a suitable register
    containing the same value as GOAL.  */

-extern rtx find_equiv_reg PARAMS ((rtx, rtx, enum reg_class, int, short *,
-                                int, enum machine_mode));
+extern rtx find_equiv_reg (rtx, rtx, enum reg_class, int, short *,
+                          int, enum machine_mode);

 
 /* Return 1 if register REGNO is the subject of a clobber in insn INSN.  */
 
 /* Return 1 if register REGNO is the subject of a clobber in insn INSN.  */

-extern int regno_clobbered_p PARAMS ((unsigned int, rtx, enum machine_mode,
-                                     int));
+extern int regno_clobbered_p (unsigned int, rtx, enum machine_mode, int);

 
 /* Return 1 if X is an operand of an insn that is being earlyclobbered.  */
 
 /* Return 1 if X is an operand of an insn that is being earlyclobbered.  */

-extern int earlyclobber_operand_p PARAMS ((rtx));
+extern int earlyclobber_operand_p (rtx);

 
 /* Record one reload that needs to be performed.  */
 
 /* Record one reload that needs to be performed.  */

-extern int push_reload PARAMS ((rtx, rtx, rtx *, rtx *, enum reg_class,
-                               enum machine_mode, enum machine_mode,
-                               int, int, int, enum reload_type));
+extern int push_reload (rtx, rtx, rtx *, rtx *, enum reg_class,
+                       enum machine_mode, enum machine_mode,
+                       int, int, int, enum reload_type);

 
 

-/* Functions in reload1.c:  */
+/* Functions in postreload.c:  */
+extern void reload_cse_regs (rtx);

 
 

-extern void reload_cse_regs            PARAMS ((rtx));
-extern int reloads_conflict            PARAMS ((int, int));
+/* Functions in reload1.c:  */

 
 /* Initialize the reload pass once per compilation.  */
 
 /* Initialize the reload pass once per compilation.  */

-extern void init_reload PARAMS ((void));
+extern void init_reload (void);

 
 /* The reload pass itself.  */
 
 /* The reload pass itself.  */

-extern int reload PARAMS ((rtx, int));
+extern int reload (rtx, int);

 
 /* Mark the slots in regs_ever_live for the hard regs
    used by pseudo-reg number REGNO.  */
 
 /* Mark the slots in regs_ever_live for the hard regs
    used by pseudo-reg number REGNO.  */

-extern void mark_home_live PARAMS ((int));
+extern void mark_home_live (int);

 
 /* Scan X and replace any eliminable registers (such as fp) with a
    replacement (such as sp), plus an offset.  */
 
 /* Scan X and replace any eliminable registers (such as fp) with a
    replacement (such as sp), plus an offset.  */

-extern rtx eliminate_regs PARAMS ((rtx, enum machine_mode, rtx));
-
-/* Emit code to perform a reload from IN (which may be a reload register) to
-   OUT (which may also be a reload register).  IN or OUT is from operand
-   OPNUM with reload type TYPE.  */
-extern rtx gen_reload PARAMS ((rtx, rtx, int, enum reload_type));
+extern rtx eliminate_regs (rtx, enum machine_mode, rtx);
+extern bool elimination_target_reg_p (rtx);

 
 /* Deallocate the reload register used by reload number R.  */
 
 /* Deallocate the reload register used by reload number R.  */

-extern void deallocate_reload_reg PARAMS ((int r));
+extern void deallocate_reload_reg (int r);

 
 /* Functions in caller-save.c:  */
 
 /* Initialize for caller-save.  */
 
 /* Functions in caller-save.c:  */
 
 /* Initialize for caller-save.  */

-extern void init_caller_save PARAMS ((void));
+extern void init_caller_save (void);

 
 /* Initialize save areas by showing that we haven't allocated any yet.  */
 
 /* Initialize save areas by showing that we haven't allocated any yet.  */

-extern void init_save_areas PARAMS ((void));
+extern void init_save_areas (void);

 
 /* Allocate save areas for any hard registers that might need saving.  */
 
 /* Allocate save areas for any hard registers that might need saving.  */

-extern void setup_save_areas PARAMS ((void));
+extern void setup_save_areas (void);

 
 /* Find the places where hard regs are live across calls and save them.  */
 
 /* Find the places where hard regs are live across calls and save them.  */

-extern void save_call_clobbered_regs PARAMS ((void));
+extern void save_call_clobbered_regs (void);

 
 /* Replace (subreg (reg)) with the appropriate (reg) for any operands.  */
 
 /* Replace (subreg (reg)) with the appropriate (reg) for any operands.  */

-extern void cleanup_subreg_operands PARAMS ((rtx));
+extern void cleanup_subreg_operands (rtx);

 
 /* Debugging support.  */
 
 /* Debugging support.  */

-extern void debug_reload_to_stream PARAMS ((FILE *));
-extern void debug_reload PARAMS ((void));
+extern void debug_reload_to_stream (FILE *);
+extern void debug_reload (void);
+
+/* Compute the actual register we should reload to, in case we're
+   reloading to/from a register that is wider than a word.  */
+extern rtx reload_adjust_reg_for_mode (rtx, enum machine_mode);