003-08-02 Andreas Tobler <a.tobler@schweiz.ch>

[pf3gnuchains/gcc-fork.git] / gcc / caller-save.c

diff --git a/gcc/caller-save.c b/gcc/caller-save.c
index 8cc72db..d40c8d9 100644 (file)
--- a/gcc/caller-save.c
+++ b/gcc/caller-save.c
@@ -1,6 +1,6 @@
 /* Save and restore call-clobbered registers which are live across a call.
    Copyright (C) 1989, 1992, 1994, 1995, 1997, 1998,
 /* Save and restore call-clobbered registers which are live across a call.
    Copyright (C) 1989, 1992, 1994, 1995, 1997, 1998,

-   1999, 2000, 2001 Free Software Foundation, Inc.
+   1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.

 
 This file is part of GCC.
 
 
 This file is part of GCC.
 


@@ -21,6 +21,8 @@ Software Foundation, 59 Temple Place - Suite 330, Boston, MA
 
 #include "config.h"
 #include "system.h"
 
 #include "config.h"
 #include "system.h"

+#include "coretypes.h"
+#include "tm.h"

 #include "rtl.h"
 #include "insn-config.h"
 #include "flags.h"
 #include "rtl.h"
 #include "insn-config.h"
 #include "flags.h"


@@ -49,13 +51,13 @@ Software Foundation, 59 Temple Place - Suite 330, Boston, MA
    register because it is live we first try to save in multi-register modes.
    If that is not possible the save is done one register at a time.  */
 
    register because it is live we first try to save in multi-register modes.
    If that is not possible the save is done one register at a time.  */
 

-static enum machine_mode 
+static enum machine_mode

   regno_save_mode[FIRST_PSEUDO_REGISTER][MAX_MOVE_MAX / MIN_UNITS_PER_WORD + 1];
 
 /* For each hard register, a place on the stack where it can be saved,
    if needed.  */
 
   regno_save_mode[FIRST_PSEUDO_REGISTER][MAX_MOVE_MAX / MIN_UNITS_PER_WORD + 1];
 
 /* For each hard register, a place on the stack where it can be saved,
    if needed.  */
 

-static rtx 
+static rtx

   regno_save_mem[FIRST_PSEUDO_REGISTER][MAX_MOVE_MAX / MIN_UNITS_PER_WORD + 1];
 
 /* We will only make a register eligible for caller-save if it can be
   regno_save_mem[FIRST_PSEUDO_REGISTER][MAX_MOVE_MAX / MIN_UNITS_PER_WORD + 1];
 
 /* We will only make a register eligible for caller-save if it can be


@@ -66,7 +68,7 @@ static rtx
 
 static int
   reg_save_code[FIRST_PSEUDO_REGISTER][MAX_MACHINE_MODE];
 
 static int
   reg_save_code[FIRST_PSEUDO_REGISTER][MAX_MACHINE_MODE];

-static int 
+static int

   reg_restore_code[FIRST_PSEUDO_REGISTER][MAX_MACHINE_MODE];
 
 /* Set of hard regs currently residing in save area (during insn scan).  */
   reg_restore_code[FIRST_PSEUDO_REGISTER][MAX_MACHINE_MODE];
 
 /* Set of hard regs currently residing in save area (during insn scan).  */


@@ -86,35 +88,37 @@ static HARD_REG_SET referenced_regs;
 static HARD_REG_SET this_insn_sets;
 
 
 static HARD_REG_SET this_insn_sets;
 
 

-static void mark_set_regs              PARAMS ((rtx, rtx, void *));
-static void mark_referenced_regs       PARAMS ((rtx));
-static int insert_save                 PARAMS ((struct insn_chain *, int, int,
-                                                HARD_REG_SET *,
-                                                enum machine_mode *));
-static int insert_restore              PARAMS ((struct insn_chain *, int, int,
-                                                int, enum machine_mode *));
-static struct insn_chain *insert_one_insn PARAMS ((struct insn_chain *, int,
-                                                  int, rtx));
-static void add_stored_regs            PARAMS ((rtx, rtx, void *));
+static void mark_set_regs (rtx, rtx, void *);
+static void mark_referenced_regs (rtx);
+static int insert_save (struct insn_chain *, int, int, HARD_REG_SET *,
+                       enum machine_mode *);
+static int insert_restore (struct insn_chain *, int, int, int,
+                          enum machine_mode *);
+static struct insn_chain *insert_one_insn (struct insn_chain *, int, int,
+                                          rtx);
+static void add_stored_regs (rtx, rtx, void *);

 \f
 /* Initialize for caller-save.
 
    Look at all the hard registers that are used by a call and for which
    regclass.c has not already excluded from being used across a call.
 
 \f
 /* Initialize for caller-save.
 
    Look at all the hard registers that are used by a call and for which
    regclass.c has not already excluded from being used across a call.
 

-   Ensure that we can find a mode to save the register and that there is a 
+   Ensure that we can find a mode to save the register and that there is a

    simple insn to save and restore the register.  This latter check avoids
    problems that would occur if we tried to save the MQ register of some
    machines directly into memory.  */
 
 void
    simple insn to save and restore the register.  This latter check avoids
    problems that would occur if we tried to save the MQ register of some
    machines directly into memory.  */
 
 void

-init_caller_save ()
+init_caller_save (void)

 {
   rtx addr_reg;
   int offset;
   rtx address;
   int i, j;
   enum machine_mode mode;
 {
   rtx addr_reg;
   int offset;
   rtx address;
   int i, j;
   enum machine_mode mode;

+  rtx savepat, restpat;
+  rtx test_reg, test_mem;
+  rtx saveinsn, restinsn;

 
   /* First find all the registers that we need to deal with and all
      the modes that they can have.  If we can't find a mode to use,
 
   /* First find all the registers that we need to deal with and all
      the modes that they can have.  If we can't find a mode to use,


@@ -151,7 +155,9 @@ init_caller_save ()
      that register in every mode we will use to save registers.  */
 
   for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
      that register in every mode we will use to save registers.  */
 
   for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)

-    if (TEST_HARD_REG_BIT (reg_class_contents[(int) BASE_REG_CLASS], i))
+    if (TEST_HARD_REG_BIT
+       (reg_class_contents
+        [(int) MODE_BASE_REG_CLASS (regno_save_mode [i][1])], i))

       break;
 
   if (i == FIRST_PSEUDO_REGISTER)
       break;
 
   if (i == FIRST_PSEUDO_REGISTER)


@@ -177,22 +183,35 @@ init_caller_save ()
     address = addr_reg;
 
   /* Next we try to form an insn to save and restore the register.  We
     address = addr_reg;
 
   /* Next we try to form an insn to save and restore the register.  We

-     see if such an insn is recognized and meets its constraints.  */
+     see if such an insn is recognized and meets its constraints.
+
+     To avoid lots of unnecessary RTL allocation, we construct all the RTL
+     once, then modify the memory and register operands in-place.  */

 
 

-  start_sequence ();
+  test_reg = gen_rtx_REG (VOIDmode, 0);
+  test_mem = gen_rtx_MEM (VOIDmode, address);
+  savepat = gen_rtx_SET (VOIDmode, test_mem, test_reg);
+  restpat = gen_rtx_SET (VOIDmode, test_reg, test_mem);
+
+  saveinsn = gen_rtx_INSN (VOIDmode, 0, 0, 0, 0, 0, savepat, -1, 0, 0);
+  restinsn = gen_rtx_INSN (VOIDmode, 0, 0, 0, 0, 0, restpat, -1, 0, 0);

 
   for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
     for (mode = 0 ; mode < MAX_MACHINE_MODE; mode++)
       if (HARD_REGNO_MODE_OK (i, mode))
         {
 
   for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
     for (mode = 0 ; mode < MAX_MACHINE_MODE; mode++)
       if (HARD_REGNO_MODE_OK (i, mode))
         {

-         rtx mem = gen_rtx_MEM (mode, address);
-         rtx reg = gen_rtx_REG (mode, i);
-         rtx savepat = gen_rtx_SET (VOIDmode, mem, reg);
-         rtx restpat = gen_rtx_SET (VOIDmode, reg, mem);
-         rtx saveinsn = emit_insn (savepat);
-         rtx restinsn = emit_insn (restpat);

          int ok;
 
          int ok;
 

+         /* Update the register number and modes of the register
+            and memory operand.  */
+         REGNO (test_reg) = i;
+         PUT_MODE (test_reg, mode);
+         PUT_MODE (test_mem, mode);
+
+         /* Force re-recognition of the modified insns.  */
+         INSN_CODE (saveinsn) = -1;
+         INSN_CODE (restinsn) = -1;
+

          reg_save_code[i][mode] = recog_memoized (saveinsn);
          reg_restore_code[i][mode] = recog_memoized (restinsn);
 
          reg_save_code[i][mode] = recog_memoized (saveinsn);
          reg_restore_code[i][mode] = recog_memoized (restinsn);
 


@@ -219,6 +238,7 @@ init_caller_save ()
          reg_save_code[i][mode] = -1;
          reg_restore_code[i][mode] = -1;
        }
          reg_save_code[i][mode] = -1;
          reg_restore_code[i][mode] = -1;
        }

+

   for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
     for (j = 1; j <= MOVE_MAX_WORDS; j++)
       if (reg_save_code [i][regno_save_mode[i][j]] == -1)
   for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
     for (j = 1; j <= MOVE_MAX_WORDS; j++)
       if (reg_save_code [i][regno_save_mode[i][j]] == -1)


@@ -230,14 +250,12 @@ init_caller_save ()
              SET_HARD_REG_BIT (call_fixed_reg_set, i);
            }
        }
              SET_HARD_REG_BIT (call_fixed_reg_set, i);
            }
        }

-
-  end_sequence ();

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

-init_save_areas ()
+init_save_areas (void)

 {
   int i, j;
 
 {
   int i, j;
 


@@ -255,17 +273,17 @@ init_save_areas ()
    Future work:
 
      In the fallback case we should iterate backwards across all possible
    Future work:
 
      In the fallback case we should iterate backwards across all possible

-     modes for the save, choosing the largest available one instead of 
+     modes for the save, choosing the largest available one instead of

      falling back to the smallest mode immediately.  (eg TF -> DF -> SF).
 
      We do not try to use "move multiple" instructions that exist
      falling back to the smallest mode immediately.  (eg TF -> DF -> SF).
 
      We do not try to use "move multiple" instructions that exist

-     on some machines (such as the 68k moveml).  It could be a win to try 
+     on some machines (such as the 68k moveml).  It could be a win to try

      and use them when possible.  The hard part is doing it in a way that is
      and use them when possible.  The hard part is doing it in a way that is

-     machine independent since they might be saving non-consecutive 
+     machine independent since they might be saving non-consecutive

      registers. (imagine caller-saving d0,d1,a0,a1 on the 68k) */
 
 void
      registers. (imagine caller-saving d0,d1,a0,a1 on the 68k) */
 
 void

-setup_save_areas ()
+setup_save_areas (void)

 {
   int i, j, k;
   unsigned int r;
 {
   int i, j, k;
   unsigned int r;


@@ -281,7 +299,7 @@ setup_save_areas ()
     if (reg_renumber[i] >= 0 && REG_N_CALLS_CROSSED (i) > 0)
       {
        unsigned int regno = reg_renumber[i];
     if (reg_renumber[i] >= 0 && REG_N_CALLS_CROSSED (i) > 0)
       {
        unsigned int regno = reg_renumber[i];

-       unsigned int endregno 
+       unsigned int endregno

          = regno + HARD_REGNO_NREGS (regno, GET_MODE (regno_reg_rtx[i]));
 
        for (r = regno; r < endregno; r++)
          = regno + HARD_REGNO_NREGS (regno, GET_MODE (regno_reg_rtx[i]));
 
        for (r = regno; r < endregno; r++)


@@ -348,7 +366,7 @@ setup_save_areas ()
 /* Find the places where hard regs are live across calls and save them.  */
 
 void
 /* Find the places where hard regs are live across calls and save them.  */
 
 void

-save_call_clobbered_regs ()
+save_call_clobbered_regs (void)

 {
   struct insn_chain *chain, *next;
   enum machine_mode save_mode [FIRST_PSEUDO_REGISTER];
 {
   struct insn_chain *chain, *next;
   enum machine_mode save_mode [FIRST_PSEUDO_REGISTER];


@@ -399,14 +417,14 @@ save_call_clobbered_regs ()
                 regs are live during the call.  */
              REG_SET_TO_HARD_REG_SET (hard_regs_to_save,
                                       &chain->live_throughout);
                 regs are live during the call.  */
              REG_SET_TO_HARD_REG_SET (hard_regs_to_save,
                                       &chain->live_throughout);

-             /* Save hard registers always in the widest mode availble.  */
+             /* Save hard registers always in the widest mode available.  */

              for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
                if (TEST_HARD_REG_BIT (hard_regs_to_save, regno))
                  save_mode [regno] = regno_save_mode [regno][1];
                else
                  save_mode [regno] = VOIDmode;
 
              for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
                if (TEST_HARD_REG_BIT (hard_regs_to_save, regno))
                  save_mode [regno] = regno_save_mode [regno][1];
                else
                  save_mode [regno] = VOIDmode;
 

-             /* Look trought all live pseudos, mark their hard registers
+             /* Look through all live pseudos, mark their hard registers

                 and choose proper mode for saving.  */
              EXECUTE_IF_SET_IN_REG_SET
                (&chain->live_throughout, FIRST_PSEUDO_REGISTER, regno,
                 and choose proper mode for saving.  */
              EXECUTE_IF_SET_IN_REG_SET
                (&chain->live_throughout, FIRST_PSEUDO_REGISTER, regno,


@@ -469,7 +487,7 @@ save_call_clobbered_regs ()
                regno += insert_restore (chain, GET_CODE (insn) == JUMP_INSN,
                                         regno, MOVE_MAX_WORDS, save_mode);
        }
                regno += insert_restore (chain, GET_CODE (insn) == JUMP_INSN,
                                         regno, MOVE_MAX_WORDS, save_mode);
        }

-    }  
+    }

 }
 
 /* Here from note_stores when an insn stores a value in a register.
 }
 
 /* Here from note_stores when an insn stores a value in a register.


@@ -477,12 +495,10 @@ save_call_clobbered_regs ()
    been assigned hard regs have had their register number changed already,
    so we can ignore pseudos.  */
 static void
    been assigned hard regs have had their register number changed already,
    so we can ignore pseudos.  */
 static void

-mark_set_regs (reg, setter, data)
-     rtx reg;
-     rtx setter ATTRIBUTE_UNUSED;
-     void *data ATTRIBUTE_UNUSED;
+mark_set_regs (rtx reg, rtx setter ATTRIBUTE_UNUSED,
+              void *data ATTRIBUTE_UNUSED)

 {
 {

-  register int regno, endregno, i;
+  int regno, endregno, i;

   enum machine_mode mode = GET_MODE (reg);
 
   if (GET_CODE (reg) == SUBREG)
   enum machine_mode mode = GET_MODE (reg);
 
   if (GET_CODE (reg) == SUBREG)


@@ -510,12 +526,9 @@ mark_set_regs (reg, setter, data)
    been assigned hard regs have had their register number changed already,
    so we can ignore pseudos.  */
 static void
    been assigned hard regs have had their register number changed already,
    so we can ignore pseudos.  */
 static void

-add_stored_regs (reg, setter, data)
-     rtx reg;
-     rtx setter;
-     void *data;
+add_stored_regs (rtx reg, rtx setter, void *data)

 {
 {

-  register int regno, endregno, i;
+  int regno, endregno, i;

   enum machine_mode mode = GET_MODE (reg);
   int offset = 0;
 
   enum machine_mode mode = GET_MODE (reg);
   int offset = 0;
 


@@ -543,8 +556,7 @@ add_stored_regs (reg, setter, data)
 
 /* Walk X and record all referenced registers in REFERENCED_REGS.  */
 static void
 
 /* Walk X and record all referenced registers in REFERENCED_REGS.  */
 static void

-mark_referenced_regs (x)
-     rtx x;
+mark_referenced_regs (rtx x)

 {
   enum rtx_code code = GET_CODE (x);
   const char *fmt;
 {
   enum rtx_code code = GET_CODE (x);
   const char *fmt;


@@ -620,12 +632,8 @@ mark_referenced_regs (x)
    Return the extra number of registers saved.  */
 
 static int
    Return the extra number of registers saved.  */
 
 static int

-insert_restore (chain, before_p, regno, maxrestore, save_mode)
-     struct insn_chain *chain;
-     int before_p;
-     int regno;
-     int maxrestore;
-     enum machine_mode *save_mode;
+insert_restore (struct insn_chain *chain, int before_p, int regno,
+               int maxrestore, enum machine_mode *save_mode)

 {
   int i, k;
   rtx pat = NULL_RTX;
 {
   int i, k;
   rtx pat = NULL_RTX;


@@ -662,7 +670,7 @@ insert_restore (chain, before_p, regno, maxrestore, save_mode)
            ok = 0;
            break;
          }
            ok = 0;
            break;
          }

-      /* Must do this one restore at a time */
+      /* Must do this one restore at a time.  */

       if (! ok)
        continue;
 
       if (! ok)
        continue;
 


@@ -673,10 +681,10 @@ insert_restore (chain, before_p, regno, maxrestore, save_mode)
   mem = regno_save_mem [regno][numregs];
   if (save_mode [regno] != VOIDmode
       && save_mode [regno] != GET_MODE (mem)
   mem = regno_save_mem [regno][numregs];
   if (save_mode [regno] != VOIDmode
       && save_mode [regno] != GET_MODE (mem)

-      && numregs == HARD_REGNO_NREGS (regno, save_mode [regno]))
+      && numregs == (unsigned int) HARD_REGNO_NREGS (regno, save_mode [regno]))

     mem = adjust_address (mem, save_mode[regno], 0);
   pat = gen_rtx_SET (VOIDmode,
     mem = adjust_address (mem, save_mode[regno], 0);
   pat = gen_rtx_SET (VOIDmode,

-                    gen_rtx_REG (GET_MODE (mem), 
+                    gen_rtx_REG (GET_MODE (mem),

                                  regno), mem);
   code = reg_restore_code[regno][GET_MODE (mem)];
   new = insert_one_insn (chain, before_p, code, pat);
                                  regno), mem);
   code = reg_restore_code[regno][GET_MODE (mem)];
   new = insert_one_insn (chain, before_p, code, pat);


@@ -689,20 +697,15 @@ insert_restore (chain, before_p, regno, maxrestore, save_mode)
       n_regs_saved--;
     }
 
       n_regs_saved--;
     }
 

-
-

   /* Tell our callers how many extra registers we saved/restored */
   return numregs - 1;
 }
 
 /* Like insert_restore above, but save registers instead.  */
   /* Tell our callers how many extra registers we saved/restored */
   return numregs - 1;
 }
 
 /* Like insert_restore above, but save registers instead.  */

+

 static int
 static int

-insert_save (chain, before_p, regno, to_save, save_mode)
-     struct insn_chain *chain;
-     int before_p;
-     int regno;
-     HARD_REG_SET *to_save;
-     enum machine_mode *save_mode;
+insert_save (struct insn_chain *chain, int before_p, int regno,
+            HARD_REG_SET (*to_save), enum machine_mode *save_mode)

 {
   int i;
   unsigned int k;
 {
   int i;
   unsigned int k;


@@ -724,7 +727,7 @@ insert_save (chain, before_p, regno, to_save, save_mode)
 
   /* Get the pattern to emit and update our status.
 
 
   /* Get the pattern to emit and update our status.
 

-     See if we can save several registers with a single instruction.  
+     See if we can save several registers with a single instruction.

      Work backwards to the single register case.  */
   for (i = MOVE_MAX_WORDS; i > 0; i--)
     {
      Work backwards to the single register case.  */
   for (i = MOVE_MAX_WORDS; i > 0; i--)
     {


@@ -739,7 +742,7 @@ insert_save (chain, before_p, regno, to_save, save_mode)
            ok = 0;
            break;
          }
            ok = 0;
            break;
          }

-      /* Must do this one save at a time */
+      /* Must do this one save at a time.  */

       if (! ok)
        continue;
 
       if (! ok)
        continue;
 


@@ -750,7 +753,7 @@ insert_save (chain, before_p, regno, to_save, save_mode)
   mem = regno_save_mem [regno][numregs];
   if (save_mode [regno] != VOIDmode
       && save_mode [regno] != GET_MODE (mem)
   mem = regno_save_mem [regno][numregs];
   if (save_mode [regno] != VOIDmode
       && save_mode [regno] != GET_MODE (mem)

-      && numregs == HARD_REGNO_NREGS (regno, save_mode [regno]))
+      && numregs == (unsigned int) HARD_REGNO_NREGS (regno, save_mode [regno]))

     mem = adjust_address (mem, save_mode[regno], 0);
   pat = gen_rtx_SET (VOIDmode, mem,
                     gen_rtx_REG (GET_MODE (mem),
     mem = adjust_address (mem, save_mode[regno], 0);
   pat = gen_rtx_SET (VOIDmode, mem,
                     gen_rtx_REG (GET_MODE (mem),


@@ -772,15 +775,11 @@ insert_save (chain, before_p, regno, to_save, save_mode)
 
 /* Emit a new caller-save insn and set the code.  */
 static struct insn_chain *
 
 /* Emit a new caller-save insn and set the code.  */
 static struct insn_chain *

-insert_one_insn (chain, before_p, code, pat)
-     struct insn_chain *chain;
-     int before_p;
-     int code;
-     rtx pat;
+insert_one_insn (struct insn_chain *chain, int before_p, int code, rtx pat)

 {
   rtx insn = chain->insn;
   struct insn_chain *new;
 {
   rtx insn = chain->insn;
   struct insn_chain *new;

-  
+

 #ifdef HAVE_cc0
   /* If INSN references CC0, put our insns in front of the insn that sets
      CC0.  This is always safe, since the only way we could be passed an
 #ifdef HAVE_cc0
   /* If INSN references CC0, put our insns in front of the insn that sets
      CC0.  This is always safe, since the only way we could be passed an