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[thirdparty/gcc.git] / gcc / config / fr30 / fr30.md

;; FR30 machine description.
;; Copyright (C) 1998-2020 Free Software Foundation, Inc.
;; Contributed by Cygnus Solutions.

;; 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/>.

;;- See file "rtl.def" for documentation on define_insn, match_*, et. al.

;;{{{ Attributes 

(define_attr "length" "" (const_int 2))

;; Used to distinguish between small memory model targets and big mode targets.

(define_attr "size" "small,big"
  (const (if_then_else (symbol_ref "TARGET_SMALL_MODEL")
                       (const_string "small")
                       (const_string "big"))))


;; Define an attribute to be used by the delay slot code.
;; An instruction by default is considered to be 'delayable'
;; that is, it can be placed into a delay slot, but it is not
;; itself a delayed branch type instruction.  An instruction
;; whose type is 'delayed' is one which has a delay slot, and
;; an instruction whose delay_type is 'other' is one which does
;; not have a delay slot, nor can it be placed into a delay slot.

(define_attr "delay_type" "delayable,delayed,other" (const_string "delayable"))

;;}}} \f
;;{{{ Delay Slot Specifications 

(define_delay (eq_attr "delay_type" "delayed")
  [(and (eq_attr "delay_type" "delayable")
        (eq_attr "length" "2"))
   (nil)
   (nil)]
)

(include "predicates.md")
(include "constraints.md")

;;}}}
;;{{{ Moves 

;;{{{ Comment 

;; Wrap moves in define_expand to prevent memory->memory moves from being
;; generated at the RTL level, which generates better code for most machines
;; which can't do mem->mem moves.

;; If operand 0 is a `subreg' with mode M of a register whose own mode is wider
;; than M, the effect of this instruction is to store the specified value in
;; the part of the register that corresponds to mode M.  The effect on the rest
;; of the register is undefined.

;; This class of patterns is special in several ways.  First of all, each of
;; these names *must* be defined, because there is no other way to copy a datum
;; from one place to another.

;; Second, these patterns are not used solely in the RTL generation pass.  Even
;; the reload pass can generate move insns to copy values from stack slots into
;; temporary registers.  When it does so, one of the operands is a hard
;; register and the other is an operand that can need to be reloaded into a
;; register.

;; Therefore, when given such a pair of operands, the pattern must
;; generate RTL which needs no reloading and needs no temporary
;; registers--no registers other than the operands.  For example, if
;; you support the pattern with a `define_expand', then in such a
;; case the `define_expand' mustn't call `force_reg' or any other such
;; function which might generate new pseudo registers.

;; This requirement exists even for subword modes on a RISC machine
;; where fetching those modes from memory normally requires several
;; insns and some temporary registers.  Look in `spur.md' to see how
;; the requirement can be satisfied.

;; During reload a memory reference with an invalid address may be passed as an
;; operand.  Such an address will be replaced with a valid address later in the
;; reload pass.  In this case, nothing may be done with the address except to
;; use it as it stands.  If it is copied, it will not be replaced with a valid
;; address.  No attempt should be made to make such an address into a valid
;; address and no routine (such as `change_address') that will do so may be
;; called.  Note that `general_operand' will fail when applied to such an
;; address.
;;
;; The global variable `reload_in_progress' (which must be explicitly declared
;; if required) can be used to determine whether such special handling is
;; required.
;;
;; The variety of operands that have reloads depends on the rest of
;; the machine description, but typically on a RISC machine these can
;; only be pseudo registers that did not get hard registers, while on
;; other machines explicit memory references will get optional
;; reloads.
;;
;; If a scratch register is required to move an object to or from memory, it
;; can be allocated using `gen_reg_rtx' prior to reload.  But this is
;; impossible during and after reload.  If there are cases needing scratch
;; registers after reload, you must define `SECONDARY_INPUT_RELOAD_CLASS' and
;; perhaps also `SECONDARY_OUTPUT_RELOAD_CLASS' to detect them, and provide
;; patterns `reload_inM' or `reload_outM' to handle them.

;; The constraints on a `moveM' must permit moving any hard register to any
;; other hard register provided that `TARGET_HARD_REGNO_MODE_OK' permits mode
;; M in both registers and `REGISTER_MOVE_COST' applied to their classes
;; returns a value of 2.

;; It is obligatory to support floating point `moveM' instructions
;; into and out of any registers that can hold fixed point values,
;; because unions and structures (which have modes `SImode' or
;; `DImode') can be in those registers and they may have floating
;; point members.

;; There may also be a need to support fixed point `moveM' instructions
;; in and out of floating point registers.  Unfortunately, I have
;; forgotten why this was so, and I don't know whether it is still true.
;; If `TARGET_HARD_REGNO_MODE_OK' rejects fixed point values in floating
;; point registers, then the constraints of the fixed point `moveM'
;; instructions must be designed to avoid ever trying to reload into a
;; floating point register.

;;}}}
;;{{{ Push and Pop  

;; Push a register onto the stack
(define_insn "movsi_push"
  [(set (mem:SI (pre_dec:SI (reg:SI 15)))
        (match_operand:SI 0 "register_operand" "a"))]
  ""
  "st   %0, @-r15"
)

;; Pop a register off the stack
(define_insn "movsi_pop"
  [(set (match_operand:SI 0 "register_operand" "=a")
        (mem:SI (post_inc:SI (reg:SI 15))))]
  ""
  "ld   @r15+, %0"
)

;;}}}
;;{{{ 1 Byte Moves 

(define_expand "movqi"
  [(set (match_operand:QI 0 "general_operand" "")
        (match_operand:QI 1 "general_operand" ""))]
  ""
  "
{
  if (!reload_in_progress
      && !reload_completed
      && GET_CODE (operands[0]) == MEM
      && (GET_CODE (operands[1]) == MEM
         || immediate_operand (operands[1], QImode)))
    operands[1] = copy_to_mode_reg (QImode, operands[1]);
}")

(define_insn "movqi_unsigned_register_load"
  [(set (match_operand:SI 0 "register_operand"              "=r")
        (zero_extend:SI (match_operand:QI 1 "memory_operand" "m")))]
  ""
  "ldub %1, %0"
)

(define_expand "movqi_signed_register_load"
  [(set (match_operand:SI 0 "register_operand"               "")
        (sign_extend:SI (match_operand:QI 1 "memory_operand" "")))]
  ""
  "
  emit_insn (gen_movqi_unsigned_register_load (operands[0], operands[1]));
  emit_insn (gen_extendqisi2 (operands[0], operands[0]));
  DONE;
  "
)

(define_insn "*movqi_internal"
  [(set (match_operand:QI 0 "nonimmediate_operand" "=r,red,m,r")
        (match_operand:QI 1 "general_operand"       "i,red,r,rm"))]
  ""
  "@
   ldi:8\\t#%A1, %0
   mov  \\t%1, %0
   stb  \\t%1, %0
   ldub \\t%1, %0"
)

;;}}}
;;{{{ 2 Byte Moves 

(define_expand "movhi"
  [(set (match_operand:HI 0 "general_operand" "")
        (match_operand:HI 1 "general_operand" ""))]
  ""
  "
{
  if (!reload_in_progress
      && !reload_completed
      && GET_CODE (operands[0]) == MEM
      && (GET_CODE (operands[1]) == MEM
         || immediate_operand (operands[1], HImode)))
    operands[1] = copy_to_mode_reg (HImode, operands[1]);
}")

(define_insn "movhi_unsigned_register_load"
  [(set (match_operand:SI 0 "register_operand" "=r")
        (zero_extend:SI (match_operand:HI 1 "memory_operand" "m")))]
  ""
  "lduh %1, %0"
)

(define_expand "movhi_signed_register_load"
  [(set (match_operand:SI 0 "register_operand" "")
        (sign_extend:SI (match_operand:HI 1 "memory_operand" "")))]
  ""
  "
  emit_insn (gen_movhi_unsigned_register_load (operands[0], operands[1]));
  emit_insn (gen_extendhisi2 (operands[0], operands[0]));
  DONE;
  "
)

(define_insn "*movhi_internal"
  [(set (match_operand:HI 0 "nonimmediate_operand" "=r,r,r,red,m,r")
        (match_operand:HI 1 "general_operand"       "L,M,n,red,r,rm"))]
  ""
  "@
   ldi:8 \\t#%1, %0
   ldi:20\\t#%1, %0
   ldi:32\\t#%1, %0
   mov   \\t%1, %0
   sth   \\t%1, %0
   lduh  \\t%1, %0"
  [(set_attr "length" "*,4,6,*,*,*")]
)

;;}}}
;;{{{ 4 Byte Moves 

;; If the destination is a MEM and the source is a
;; MEM or an CONST_INT move the source into a register.
(define_expand "movsi"
  [(set (match_operand:SI 0 "nonimmediate_operand" "")
        (match_operand:SI 1 "general_operand" ""))]
  ""
  "{
  if (!reload_in_progress
      && !reload_completed
      && GET_CODE(operands[0]) == MEM
      && (GET_CODE (operands[1]) == MEM
          || immediate_operand (operands[1], SImode)))
     operands[1] = copy_to_mode_reg (SImode, operands[1]);
  }"
)

;; We can do some clever tricks when loading certain immediate
;; values.  We implement these tricks as define_splits, rather
;; than putting the code into the define_expand "movsi" above,
;; because if we put them there, they will be evaluated at RTL
;; generation time and then the combiner pass will come along
;; and replace the multiple insns that have been generated with
;; the original, slower, load insns.  (The combiner pass only
;; cares about reducing the number of instructions, it does not
;; care about instruction lengths or speeds).  Splits are
;; evaluated after the combine pass and before the scheduling
;; passes, so that they are the perfect place to put this
;; intelligence.
;;
;; XXX we probably ought to implement these for QI and HI mode
;; loads as well.

;; If we are loading a small negative constant we can save space
;; and time by loading the positive value and then sign extending it.
(define_split
  [(set (match_operand:SI 0 "register_operand"  "")
        (match_operand:SI 1 "const_int_operand" ""))]
   "INTVAL (operands[1]) <= -1 && INTVAL (operands[1]) >= -128
    && (GET_CODE (operands[0]) != SUBREG
        || SCALAR_INT_MODE_P (GET_MODE (XEXP (operands[0], 0))))"
   [(set (match_dup 0) (match_dup 1))
    (set (match_dup 0) (sign_extend:SI (match_dup 2)))]
   "{
   operands[1] = GEN_INT (INTVAL (operands[1]) & 0xff);
   operands[2] = gen_lowpart (QImode, operands[0]);
   }"
)

;; If we are loading a large negative constant, one which does
;; not have any of its bottom 24 bit set, then we can save time
;; and space by loading the byte value and shifting it into place.
(define_split
  [(set (match_operand:SI 0 "register_operand"  "")
        (match_operand:SI 1 "const_int_operand" ""))]
   "(INTVAL (operands[1]) < 0) && ((INTVAL (operands[1]) & 0x00ffffff) == 0)"
   [(set (match_dup 0) (match_dup 2))
    (parallel [(set (match_dup 0) (ashift:SI (match_dup 0) (const_int 24)))
               (clobber (reg:CC 16))])]
   "{
   HOST_WIDE_INT val = INTVAL (operands[1]);
   operands[2] = GEN_INT (val >> 24);
   }"
)

;; If we are loading a large positive constant, one which has bits
;; in the top byte set, but whose set bits all lie within an 8 bit
;; range, then we can save time and space by loading the byte value
;; and shifting it into place.
(define_split
  [(set (match_operand:SI 0 "register_operand"  "")
        (match_operand:SI 1 "const_int_operand" ""))]
   "(INTVAL (operands[1]) > 0x00ffffff)
   && ((INTVAL (operands[1]) >> exact_log2 (INTVAL (operands[1]) & (- INTVAL (operands[1])))) < 0x100)"
   [(set (match_dup 0) (match_dup 2))
    (parallel [(set (match_dup 0) (ashift:SI (match_dup 0) (match_dup 3)))
               (clobber (reg:CC 16))])]
   "{
   HOST_WIDE_INT val = INTVAL (operands[1]);
   int shift = exact_log2 (val & ( - val));
   operands[2] = GEN_INT (val >> shift);
   operands[3] = GEN_INT (shift);
   }"
)

;; When TARGET_SMALL_MODEL is defined we assume that all symbolic
;; values are addresses which will fit in 20 bits.

(define_insn "movsi_internal"
  [(set (match_operand:SI 0 "nonimmediate_operand" "=r,r,r,r,red,V,r,m")
        (match_operand:SI 1 "general_operand"       "L,M,n,i,rde,r,rm,r"))]
  ""
  "*
  {
    switch (which_alternative)
    {
    case 0: return   \"ldi:8 \\t#%1, %0\";
    case 1: return   \"ldi:20\\t#%1, %0\";
    case 2: return   \"ldi:32\\t#%1, %0\";
    case 3: if (TARGET_SMALL_MODEL)
              return \"ldi:20\\t%1, %0\";
            else
              return \"ldi:32\\t%1, %0\";
    case 4: return   \"mov   \\t%1, %0\";
    case 5: return   \"st    \\t%1, %0\";
    case 6: return   \"ld    \\t%1, %0\";
    case 7: return   \"st    \\t%1, %0\";
    default: gcc_unreachable ();
   }
  }"
  [(set (attr "length") (cond [(eq_attr "alternative" "1") (const_int 4)
                               (eq_attr "alternative" "2") (const_int 6)
                               (eq_attr "alternative" "3") 
                                        (if_then_else (eq_attr "size" "small")
                                                      (const_int 4)
                                                      (const_int 6))]
                              (const_int 2)))]
)

;;}}}
;;{{{ 8 Byte Moves

;; Note - the FR30 does not have an 8 byte load/store instruction
;; but we have to support this pattern because some other patterns
;; (e.g. muldisi2) can produce a DImode result.
;; (This code is stolen from the M32R port.)

(define_expand "movdi"
  [(set (match_operand:DI 0 "nonimmediate_operand" "")
        (match_operand:DI 1 "general_operand" ""))]
  ""
  "
  /* Everything except mem = const or mem = mem can be done easily.  */

  if (GET_CODE (operands[0]) == MEM)
    operands[1] = force_reg (DImode, operands[1]);
  "
)

;; We use an insn and a split so that we can generate
;; RTL rather than text from fr30_move_double().

(define_insn "*movdi_insn"
  [(set (match_operand:DI 0 "nonimmediate_di_operand" "=r,r,m,r")
        (match_operand:DI 1 "di_operand"               "r,m,r,nF"))]
  "register_operand (operands[0], DImode) || register_operand (operands[1], DImode)"
  "#"
  [(set_attr "length" "4,8,12,12")]
)

(define_split
  [(set (match_operand:DI 0 "nonimmediate_di_operand" "")
        (match_operand:DI 1 "di_operand" ""))]
  "reload_completed"
  [(match_dup 2)]
  "operands[2] = fr30_move_double (operands);"
)

;;}}}
;;{{{ Load & Store Multiple Registers 

;; The load multiple and store multiple patterns are implemented
;; as peepholes because the only time they are expected to occur
;; is during function prologues and epilogues.

(define_peephole
  [(set (mem:SI (pre_dec:SI (reg:SI 15)))
        (match_operand:SI 0 "high_register_operand" "h"))
   (set (mem:SI (pre_dec:SI (reg:SI 15)))
        (match_operand:SI 1 "high_register_operand" "h"))
   (set (mem:SI (pre_dec:SI (reg:SI 15)))
        (match_operand:SI 2 "high_register_operand" "h"))
   (set (mem:SI (pre_dec:SI (reg:SI 15)))
        (match_operand:SI 3 "high_register_operand" "h"))]
  "fr30_check_multiple_regs (operands, 4, 1)"
  "stm1 (%0, %1, %2, %3)"
  [(set_attr "delay_type" "other")]
)

(define_peephole
  [(set (mem:SI (pre_dec:SI (reg:SI 15)))
        (match_operand:SI 0 "high_register_operand" "h"))
   (set (mem:SI (pre_dec:SI (reg:SI 15)))
        (match_operand:SI 1 "high_register_operand" "h"))
   (set (mem:SI (pre_dec:SI (reg:SI 15)))
        (match_operand:SI 2 "high_register_operand" "h"))]
  "fr30_check_multiple_regs (operands, 3, 1)"
  "stm1 (%0, %1, %2)"
  [(set_attr "delay_type" "other")]
)

(define_peephole
  [(set (mem:SI (pre_dec:SI (reg:SI 15)))
        (match_operand:SI 0 "high_register_operand" "h"))
   (set (mem:SI (pre_dec:SI (reg:SI 15)))
        (match_operand:SI 1 "high_register_operand" "h"))]
  "fr30_check_multiple_regs (operands, 2, 1)"
  "stm1 (%0, %1)"
  [(set_attr "delay_type" "other")]
)

(define_peephole
  [(set (match_operand:SI 0 "high_register_operand" "h")
        (mem:SI (post_inc:SI (reg:SI 15))))
   (set (match_operand:SI 1 "high_register_operand" "h")
        (mem:SI (post_inc:SI (reg:SI 15))))
   (set (match_operand:SI 2 "high_register_operand" "h")
        (mem:SI (post_inc:SI (reg:SI 15))))
   (set (match_operand:SI 3 "high_register_operand" "h")
        (mem:SI (post_inc:SI (reg:SI 15))))]
  "fr30_check_multiple_regs (operands, 4, 0)"
  "ldm1 (%0, %1, %2, %3)"
  [(set_attr "delay_type" "other")]
)

(define_peephole
  [(set (match_operand:SI 0 "high_register_operand" "h")
        (mem:SI (post_inc:SI (reg:SI 15))))
   (set (match_operand:SI 1 "high_register_operand" "h")
        (mem:SI (post_inc:SI (reg:SI 15))))
   (set (match_operand:SI 2 "high_register_operand" "h")
        (mem:SI (post_inc:SI (reg:SI 15))))]
  "fr30_check_multiple_regs (operands, 3, 0)"
  "ldm1 (%0, %1, %2)"
  [(set_attr "delay_type" "other")]
)

(define_peephole
  [(set (match_operand:SI 0 "high_register_operand" "h")
        (mem:SI (post_inc:SI (reg:SI 15))))
   (set (match_operand:SI 1 "high_register_operand" "h")
        (mem:SI (post_inc:SI (reg:SI 15))))]
  "fr30_check_multiple_regs (operands, 2, 0)"
  "ldm1 (%0, %1)"
  [(set_attr "delay_type" "other")]
)

(define_peephole
  [(set (mem:SI (pre_dec:SI (reg:SI 15)))
        (match_operand:SI 0 "low_register_operand" "l"))
   (set (mem:SI (pre_dec:SI (reg:SI 15)))
        (match_operand:SI 1 "low_register_operand" "l"))
   (set (mem:SI (pre_dec:SI (reg:SI 15)))
        (match_operand:SI 2 "low_register_operand" "l"))
   (set (mem:SI (pre_dec:SI (reg:SI 15)))
        (match_operand:SI 3 "low_register_operand" "l"))]
  "fr30_check_multiple_regs (operands, 4, 1)"
  "stm0 (%0, %1, %2, %3)"
  [(set_attr "delay_type" "other")]
)

(define_peephole
  [(set (mem:SI (pre_dec:SI (reg:SI 15)))
        (match_operand:SI 0 "low_register_operand" "l"))
   (set (mem:SI (pre_dec:SI (reg:SI 15)))
        (match_operand:SI 1 "low_register_operand" "l"))
   (set (mem:SI (pre_dec:SI (reg:SI 15)))
        (match_operand:SI 2 "low_register_operand" "l"))]
  "fr30_check_multiple_regs (operands, 3, 1)"
  "stm0 (%0, %1, %2)"
  [(set_attr "delay_type" "other")]
)

(define_peephole
  [(set (mem:SI (pre_dec:SI (reg:SI 15)))
        (match_operand:SI 0 "low_register_operand" "l"))
   (set (mem:SI (pre_dec:SI (reg:SI 15)))
        (match_operand:SI 1 "low_register_operand" "l"))]
  "fr30_check_multiple_regs (operands, 2, 1)"
  "stm0 (%0, %1)"
  [(set_attr "delay_type" "other")]
)

;;}}}
;;{{{ Floating Point Moves 

;; Note - Patterns for SF mode moves are compulsory, but
;; patterns for DF are optional, as GCC can synthesize them.

(define_expand "movsf"
  [(set (match_operand:SF 0 "general_operand" "")
        (match_operand:SF 1 "general_operand" ""))]
  ""
  "{
  if (!reload_in_progress && !reload_completed
      && memory_operand (operands[0], SFmode)
      && memory_operand (operands[1], SFmode))
    operands[1] = copy_to_mode_reg (SFmode, operands[1]);
  }"
)

(define_insn "*movsf_internal"
  [(set (match_operand:SF 0 "nonimmediate_operand" "=r,r,red,m,r")
        (match_operand:SF 1 "general_operand"      "Fn,i,rde,r,rm"))]
  ""
  "*
  {
    switch (which_alternative)
    {
    case 0: return   \"ldi:32\\t%1, %0\";
    case 1: if (TARGET_SMALL_MODEL)
              return \"ldi:20\\t%1, %0\";
            else
              return \"ldi:32\\t%1, %0\";
    case 2: return   \"mov   \\t%1, %0\";
    case 3: return   \"st    \\t%1, %0\";
    case 4: return   \"ld    \\t%1, %0\";
    default: gcc_unreachable ();               
    }
  }"
  [(set (attr "length") (cond [(eq_attr "alternative" "0") (const_int 6)
                               (eq_attr "alternative" "1") 
                                        (if_then_else (eq_attr "size" "small")
                                                      (const_int 4)
                                                      (const_int 6))]
                              (const_int 2)))]
)

(define_insn "*movsf_constant_store"
  [(set (match_operand:SF 0 "memory_operand"    "=m")
        (match_operand:SF 1 "immediate_operand" "F"))]
  ""
  "*
  {
  const char *    ldi_instr;
  const char *    tmp_reg;
  static char     buffer[100];

  ldi_instr = fr30_const_double_is_zero (operands[1]) ? \"ldi:8\" : \"ldi:32\";

  tmp_reg = reg_names [COMPILER_SCRATCH_REGISTER];
  
  sprintf (buffer, \"%s\\t#%%1, %s\\t;\\n\\tst\\t%s, %%0\\t; Created by movsf_constant_store\",
    ldi_instr, tmp_reg, tmp_reg);

  return buffer;
  }"
  [(set_attr "length" "8")]
)

;;}}}

;;}}} \f
;;{{{ Conversions 

;; Signed conversions from a smaller integer to a larger integer

(define_insn "extendqisi2"
  [(set (match_operand:SI 0 "register_operand"                "=r")
        (sign_extend:SI (match_operand:QI 1 "register_operand" "0")))]
  ""
  "extsb        %0"
)

(define_insn "extendhisi2"
  [(set (match_operand:SI 0 "register_operand"                "=r")
        (sign_extend:SI (match_operand:HI 1 "register_operand" "0")))]
  ""
  "extsh        %0"
)

;; Unsigned conversions from a smaller integer to a larger integer

(define_insn "zero_extendqisi2"
  [(set (match_operand:SI 0 "register_operand"                "=r")
        (zero_extend:SI (match_operand:QI 1 "register_operand" "0")))]
  ""
  "extub        %0"
)

(define_insn "zero_extendhisi2"
  [(set (match_operand:SI 0 "register_operand"                "=r")
        (zero_extend:SI (match_operand:HI 1 "register_operand" "0")))]
  ""
  "extuh        %0"
)

;;}}} \f
;;{{{ Arithmetic 

;;{{{ Addition 

;; This is a special pattern just for adjusting the stack size.
(define_insn "add_to_stack"
  [(set (reg:SI 15)
        (plus:SI (reg:SI 15)
                 (match_operand:SI 0 "stack_add_operand" "i")))]
  ""
  "addsp        %0"
)

;; We need some trickery to be able to handle the addition of
;; large (i.e. outside +/- 16) constants.  We need to be able to
;; handle this because reload assumes that it can generate add
;; instructions with arbitrary sized constants.
(define_expand "addsi3"
  [(set (match_operand:SI 0 "register_operand"           "")
        (plus:SI (match_operand:SI 1 "register_operand"  "")
                 (match_operand:SI 2 "nonmemory_operand" "")))]
  ""
  "{
  if (   GET_CODE (operands[2]) == REG
      || GET_CODE (operands[2]) == SUBREG)
    emit_insn (gen_addsi_regs (operands[0], operands[1], operands[2]));
  else if (GET_CODE (operands[2]) != CONST_INT)
    emit_insn (gen_addsi_big_int (operands[0], operands[1], operands[2]));
  else if (INTVAL (operands[2]) >= -16
           && INTVAL (operands[2]) <= 15
           && (!REG_P (operands[1])
               || !REGNO_PTR_FRAME_P (REGNO (operands[1]))
               || REGNO (operands[1]) == STACK_POINTER_REGNUM))
    emit_insn (gen_addsi_small_int (operands[0], operands[1], operands[2]));
  else
    emit_insn (gen_addsi_big_int (operands[0], operands[1], operands[2]));
  DONE;
  }"
)

(define_insn "addsi_regs"
  [(set (match_operand:SI 0 "register_operand"          "=r")
        (plus:SI (match_operand:SI 1 "register_operand" "%0")
                 (match_operand:SI 2 "register_operand"  "r")))]
  ""
  "addn %2, %0"
)

;; Do not allow an eliminable register in the source register.  It
;; might be eliminated in favor of the stack pointer, probably
;; increasing the offset, and so rendering the instruction illegal.
(define_insn "addsi_small_int"
  [(set (match_operand:SI 0 "register_operand"              "=r,r")
        (plus:SI (match_operand:SI 1 "register_operand"      "0,0")
                 (match_operand:SI 2 "add_immediate_operand" "I,J")))]
  "!REG_P (operands[1])
   || !REGNO_PTR_FRAME_P (REGNO (operands[1]))
   || REGNO (operands[1]) == STACK_POINTER_REGNUM"
  "@
   addn %2, %0
   addn2        %2, %0"
)

(define_expand "addsi_big_int"
  [(set (match_operand:SI 0 "register_operand"           "")
        (plus:SI (match_operand:SI 1 "register_operand"  "")
                 (match_operand:SI 2 "immediate_operand" "")))]
  ""
  "{
  /* Cope with the possibility that ops 0 and 1 are the same register.  */
  if (rtx_equal_p (operands[0], operands[1]))
    {
      if (reload_in_progress || reload_completed)
        {
          rtx reg = gen_rtx_REG (SImode, 0/*COMPILER_SCRATCH_REGISTER*/);
          
          emit_insn (gen_movsi (reg, operands[2]));
          emit_insn (gen_addsi_regs (operands[0], operands[0], reg));
        }
      else
        {
          operands[2] = force_reg (SImode, operands[2]);
          emit_insn (gen_addsi_regs (operands[0], operands[0], operands[2]));
        }
    }
  else
    {
      emit_insn (gen_movsi (operands[0], operands[2]));
      emit_insn (gen_addsi_regs (operands[0], operands[0], operands[1]));
    }
  DONE;
  }"
)

(define_insn "*addsi_for_reload"
  [(set (match_operand:SI 0 "register_operand"         "=&r,r,r")
        (plus:SI (match_operand:SI 1 "register_operand"  "r,r,r")
                 (match_operand:SI 2 "immediate_operand" "L,M,n")))]
  "reload_in_progress || reload_completed"
  "@
  ldi:8\\t#%2, %0  \\n\\taddn\\t%1, %0
  ldi:20\\t#%2, %0 \\n\\taddn\\t%1, %0
  ldi:32\\t#%2, %0 \\n\\taddn\\t%1, %0"
  [(set_attr "length" "4,6,8")]
)

;;}}}
;;{{{ Subtraction 

(define_insn "subsi3"
  [(set (match_operand:SI 0 "register_operand"       "=r")
        (minus:SI (match_operand:SI 1 "register_operand" "0")
                  (match_operand:SI 2 "register_operand" "r")))]
  ""
  "subn %2, %0"
)

;;}}}
;;{{{ Multiplication 

;; Signed multiplication producing 64-bit results from 32-bit inputs
(define_insn "mulsidi3"
  [(set (match_operand:DI 0 "register_operand"                             "=r")
           (mult:DI (sign_extend:DI (match_operand:SI 1 "register_operand" "%r"))
                    (sign_extend:DI (match_operand:SI 2 "register_operand"  "r"))))
   (clobber (reg:CC 16))]
  ""
  "mul  %2, %1\\n\\tmov\\tmdh, %0\\n\\tmov\\tmdl, %p0"
  [(set_attr "length" "6")]
)

;; Unsigned multiplication producing 64-bit results from 32-bit inputs
(define_insn "umulsidi3"
  [(set (match_operand:DI 0 "register_operand"                             "=r")
           (mult:DI (zero_extend:DI (match_operand:SI 1 "register_operand" "%r"))
                    (zero_extend:DI (match_operand:SI 2 "register_operand"  "r"))))
   (clobber (reg:CC 16))]
  ""
  "mulu %2, %1\\n\\tmov\\tmdh, %0\\n\\tmov\\tmdl, %p0"
  [(set_attr "length" "6")]
)

;; Signed multiplication producing 32-bit result from 16-bit inputs
(define_insn "mulhisi3"
  [(set (match_operand:SI 0 "register_operand"                             "=r")
           (mult:SI (sign_extend:SI (match_operand:HI 1 "register_operand" "%r"))
                    (sign_extend:SI (match_operand:HI 2 "register_operand"  "r"))))
   (clobber (reg:CC 16))]
  ""
  "mulh %2, %1\\n\\tmov\\tmdl, %0"
  [(set_attr "length" "4")]
)

;; Unsigned multiplication producing 32-bit result from 16-bit inputs
(define_insn "umulhisi3"
  [(set (match_operand:SI 0 "register_operand"                             "=r")
           (mult:SI (zero_extend:SI (match_operand:HI 1 "register_operand" "%r"))
                    (zero_extend:SI (match_operand:HI 2 "register_operand"  "r"))))
   (clobber (reg:CC 16))]
  ""
  "muluh        %2, %1\\n\\tmov\\tmdl, %0"
  [(set_attr "length" "4")]
)

;; Signed multiplication producing 32-bit result from 32-bit inputs
(define_insn "mulsi3"
  [(set (match_operand:SI 0 "register_operand"             "=r")
           (mult:SI (match_operand:SI 1 "register_operand" "%r")
                    (match_operand:SI 2 "register_operand"  "r")))
   (clobber (reg:CC 16))]
  ""
  "mul  %2, %1\\n\\tmov\\tmdl, %0"
  [(set_attr "length" "4")]
)

;;}}}
;;}}} \f
;;{{{ Shifts 

;; Arithmetic Shift Left
(define_insn "ashlsi3"
  [(set (match_operand:SI 0 "register_operand"            "=r,r,r")
        (ashift:SI (match_operand:SI 1 "register_operand"  "0,0,0")
                   (match_operand:SI 2 "nonmemory_operand" "r,I,K")))
   (clobber (reg:CC 16))]
  ""
  "@
  lsl   %2, %0
  lsl   %2, %0
  lsl2  %x2, %0"
)

;; Arithmetic Shift Right
(define_insn "ashrsi3"
  [(set (match_operand:SI 0 "register_operand"              "=r,r,r")
        (ashiftrt:SI (match_operand:SI 1 "register_operand"  "0,0,0")
                     (match_operand:SI 2 "nonmemory_operand" "r,I,K")))
   (clobber (reg:CC 16))]
  ""
  "@
  asr   %2, %0
  asr   %2, %0
  asr2  %x2, %0"
)

;; Logical Shift Right
(define_insn "lshrsi3"
  [(set (match_operand:SI 0 "register_operand"              "=r,r,r")
        (lshiftrt:SI (match_operand:SI 1 "register_operand"  "0,0,0")
                     (match_operand:SI 2 "nonmemory_operand" "r,I,K")))
   (clobber (reg:CC 16))]
  ""
  "@
  lsr   %2, %0
  lsr   %2, %0
  lsr2  %x2, %0"
)

;;}}} \f
;;{{{ Logical Operations 

;; Logical AND, 32-bit integers
(define_insn "andsi3"
  [(set (match_operand:SI 0 "register_operand"         "=r")
        (and:SI (match_operand:SI 1 "register_operand" "%r")
                (match_operand:SI 2 "register_operand"  "0")))
   (clobber (reg:CC 16))]
  ""
  "and  %1, %0"
)

;; Inclusive OR, 32-bit integers
(define_insn "iorsi3"
  [(set (match_operand:SI 0 "register_operand"         "=r")
        (ior:SI (match_operand:SI 1 "register_operand" "%r")
                (match_operand:SI 2 "register_operand"  "0")))
   (clobber (reg:CC 16))]
  ""
  "or   %1, %0"
)

;; Exclusive OR, 32-bit integers
(define_insn "xorsi3"
  [(set (match_operand:SI 0 "register_operand"         "=r")
        (xor:SI (match_operand:SI 1 "register_operand" "%r")
                (match_operand:SI 2 "register_operand"  "0")))
   (clobber (reg:CC 16))]
  ""
  "eor  %1, %0"
)

;; One's complement, 32-bit integers
(define_expand "one_cmplsi2"
  [(set (match_operand:SI 0 "register_operand"         "")
        (not:SI (match_operand:SI 1 "register_operand" "")))]
  ""
  "{
  if (rtx_equal_p (operands[0], operands[1]))
    {
      if (reload_in_progress || reload_completed)
        {
          rtx reg = gen_rtx_REG (SImode, 0/*COMPILER_SCRATCH_REGISTER*/);
          
          emit_insn (gen_movsi (reg, constm1_rtx));
          emit_insn (gen_xorsi3 (operands[0], operands[0], reg));
        }
      else
        {
          rtx reg = gen_reg_rtx (SImode);
        
          emit_insn (gen_movsi (reg, constm1_rtx));
          emit_insn (gen_xorsi3 (operands[0], operands[0], reg));
        }
    }
  else
    {
      emit_insn (gen_movsi_internal (operands[0], constm1_rtx));
      emit_insn (gen_xorsi3 (operands[0], operands[1], operands[0]));
    }
  DONE;
  }"
)

;;}}} \f
;;{{{ Comparisons 

;; The actual comparisons, generated by the cbranch and/or cstore expanders

(define_insn "*cmpsi_internal"
  [(set (reg:CC 16)
        (compare:CC (match_operand:SI 0 "register_operand"  "r,r,r")
                    (match_operand:SI 1 "nonmemory_operand" "r,I,J")))]
  ""
  "@
  cmp   %1, %0
  cmp   %1, %0
  cmp2  %1, %0"
)

;;}}} \f
;;{{{ Branches 

;; Define_expands called by the machine independent part of the compiler
;; to allocate a new comparison register

(define_expand "cbranchsi4"
  [(set (reg:CC 16)
        (compare:CC (match_operand:SI 1 "register_operand"  "")
                    (match_operand:SI 2 "nonmemory_operand" "")))
   (set (pc)
        (if_then_else (match_operator 0 "ordered_comparison_operator"
                       [(reg:CC 16) (const_int 0)])
                      (label_ref (match_operand 3 "" ""))
                      (pc)))]
  ""
  ""
)


;; Actual branches.  We must allow for the (label_ref) and the (pc) to be
;; swapped.  If they are swapped, it reverses the sense of the branch.

;; This pattern matches the (branch-if-true) branches generated above.
;; It generates two different instruction sequences depending upon how
;; far away the destination is.

;; The calculation for the instruction length is derived as follows:
;; The branch instruction has a 9-bit signed displacement so we have
;; this inequality for the displacement:
;;
;;               -256 <= pc < 256
;; or
;;         -256 + 256 <= pc + 256 < 256 + 256
;; i.e.
;;                  0 <= pc + 256 < 512 
;;
;; if we consider the displacement as an unsigned value, then negative
;; displacements become very large positive displacements, and the
;; inequality becomes:
;;
;;              pc + 256 < 512
;;
;; In order to allow for the fact that the real branch instruction works
;; from pc + 2, we increase the offset to 258.
;;
;; Note - we do not have to worry about whether the branch is delayed or
;; not, as branch shortening happens after delay slot reorganization.

(define_insn "*branch_true"
  [(set (pc)
        (if_then_else (match_operator 0 "comparison_operator"
                                      [(reg:CC 16)
                                       (const_int 0)])
                      (label_ref (match_operand 1 "" ""))
                      (pc)))]
  ""
  "*
  {
    if (get_attr_length (insn) == 2)
      return \"b%b0%#\\t%l1\";
    else
      {
        static char   buffer [100];
        const char *  tmp_reg; 
        const char *  ldi_insn;
        
        tmp_reg = reg_names [COMPILER_SCRATCH_REGISTER];
        
        ldi_insn = TARGET_SMALL_MODEL ? \"ldi:20\" : \"ldi:32\";

        /* The code produced here is, for say the EQ case:

               Bne  1f
               LDI  <label>, r0
               JMP  r0
             1:                                         */
             
        sprintf (buffer,
          \"b%%B0\\t1f\\t;\\n\\t%s\\t%%l1, %s\\t;\\n\\tjmp%%#\\t@%s\\t;\\n1:\",
          ldi_insn, tmp_reg, tmp_reg);
 
        return buffer;
    }
  }"
  [(set (attr "length") (if_then_else
                          (ltu
                            (plus
                              (minus
                                (match_dup 1)
                                (pc))
                              (const_int 254))
                            (const_int 506))
                          (const_int 2)
                          (if_then_else (eq_attr "size" "small")
                                        (const_int 8)
                                        (const_int 10))))
   (set_attr "delay_type" "delayed")]
)


;; This pattern is a duplicate of the previous one, except that the
;; branch occurs if the test is false, so the %B operator is used.
(define_insn "*branch_false"
  [(set (pc)
        (if_then_else (match_operator 0 "comparison_operator"
                                      [(reg:CC 16)
                                       (const_int 0)])
                      (pc)
                      (label_ref (match_operand 1 "" ""))))]
  ""
  "*
  {
    if (get_attr_length (insn) == 2)
      return \"b%B0%#\\t%l1 \";
    else
      {
        static char   buffer [100];
        const char *  tmp_reg; 
        const char *  ldi_insn;
        
        tmp_reg = reg_names [COMPILER_SCRATCH_REGISTER];
        
        ldi_insn = TARGET_SMALL_MODEL ? \"ldi:20\" : \"ldi:32\";

        sprintf (buffer,
          \"b%%b0\\t1f\\t;\\n\\t%s\\t%%l1, %s\\t;\\n\\tjmp%%#\\t@%s\\t;\\n1:\",
          ldi_insn, tmp_reg, tmp_reg);
 
        return buffer;
      }
  }"
  [(set (attr "length") (if_then_else (ltu (plus (minus (match_dup 1) (pc))
                                                 (const_int 254))
                                           (const_int 506))
                                      (const_int 2)
                                      (if_then_else (eq_attr "size" "small")
                                                    (const_int 8)
                                                    (const_int 10))))
   (set_attr "delay_type" "delayed")]
)

;;}}} \f
;;{{{ Calls & Jumps 

;; Subroutine call instruction returning no value.  Operand 0 is the function
;; to call; operand 1 is the number of bytes of arguments pushed (in mode
;; `SImode', except it is normally a `const_int'); operand 2 is the number of
;; registers used as operands.

(define_insn "call"
  [(call (match_operand 0 "call_operand" "Qm")
         (match_operand 1 ""             "g"))
   (clobber (reg:SI 17))]
  ""
  "call%#\\t%0"
  [(set_attr "delay_type" "delayed")]
)

;; Subroutine call instruction returning a value.  Operand 0 is the hard
;; register in which the value is returned.  There are three more operands, the
;; same as the three operands of the `call' instruction (but with numbers
;; increased by one).

;; Subroutines that return `BLKmode' objects use the `call' insn.

(define_insn "call_value"
  [(set (match_operand 0 "register_operand"  "=r")
        (call (match_operand 1 "call_operand" "Qm")
              (match_operand 2 ""             "g")))
   (clobber (reg:SI 17))]
  ""
  "call%#\\t%1"
  [(set_attr "delay_type" "delayed")]
)

;; Normal unconditional jump.
;; For a description of the computation of the length 
;; attribute see the branch patterns above.
;;
;; Although this instruction really clobbers r0, flow
;; relies on jump being simplejump_p in several places
;; and as r0 is fixed, this doesn't change anything
(define_insn "jump"
  [(set (pc) (label_ref (match_operand 0 "" "")))]
  ""
  "*
  {
    if (get_attr_length (insn) == 2)
       return \"bra%#\\t%0\";
    else
      {
        static char   buffer [100];
        const char *  tmp_reg; 
        const char *  ldi_insn;
        
        tmp_reg = reg_names [COMPILER_SCRATCH_REGISTER];

        ldi_insn = TARGET_SMALL_MODEL ? \"ldi:20\" : \"ldi:32\";

        sprintf (buffer, \"%s\\t%%0, %s\\t;\\n\\tjmp%%#\\t@%s\\t;\",
          ldi_insn, tmp_reg, tmp_reg);
 
        return buffer;
      }
  }"
  [(set (attr "length") (if_then_else (ltu (plus (minus (match_dup 0) (pc))
                                                (const_int 254))
                                          (const_int 506))
                                     (const_int 2)
                                     (if_then_else (eq_attr "size" "small")
                                                   (const_int 6)
                                                   (const_int 8))))
   (set_attr "delay_type" "delayed")]
)

;; Indirect jump through a register
(define_insn "indirect_jump"
  [(set (pc) (match_operand 0 "pmode_register_operand" "r"))]
  ""
  "jmp%#\\t@%0"
  [(set_attr "delay_type" "delayed")]
)

(define_insn "tablejump"
  [(set (pc) (match_operand:SI 0 "register_operand" "r"))
   (use (label_ref (match_operand 1 "" "")))]
  ""
  "jmp%#\\t@%0"
  [(set_attr "delay_type" "delayed")]
)

;;}}} \f
;;{{{ Function Prologues and Epilogues 

;; Called after register allocation to add any instructions needed for the
;; prologue.  Using a prologue insn is favored compared to putting all of the
;; instructions in output_function_prologue(), since it allows the scheduler
;; to intermix instructions with the saves of the caller saved registers.  In
;; some cases, it might be necessary to emit a barrier instruction as the last
;; insn to prevent such scheduling.
(define_expand "prologue"
  [(clobber (const_int 0))]
  ""
  "{
  fr30_expand_prologue ();
  DONE;
  }"
)

;; Called after register allocation to add any instructions needed for the
;; epilogue.  Using an epilogue insn is favored compared to putting all of the
;; instructions in output_function_epilogue(), since it allows the scheduler
;; to intermix instructions with the restores of the caller saved registers.
;; In some cases, it might be necessary to emit a barrier instruction as the
;; first insn to prevent such scheduling.
(define_expand "epilogue"
  [(return)]
  ""
  "{
  fr30_expand_epilogue ();
  DONE;
  }"
)

(define_insn "return_from_func"
  [(return)
   (use (reg:SI 17))]
  "reload_completed"
  "ret%#"
  [(set_attr "delay_type" "delayed")]
)

(define_insn "leave_func"
  [(set (reg:SI 15) (plus:SI (reg:SI 14) (const_int 4)))
   (set (reg:SI 14) (mem:SI (minus:SI (reg:SI 15) (const_int 4))))]
  "reload_completed"
  "leave"
)

(define_expand "enter_func"
  [(parallel
  [(set (mem:SI (minus:SI (match_dup 1)
                          (const_int 4)))
        (match_dup 2))
   (set (match_dup 2)
        (minus:SI (match_dup 1)
                  (const_int 4)))
   (set (match_dup 1)
        (minus:SI (match_dup 1)
                  (match_operand:SI 0 "immediate_operand")))]
  )]
  ""
{
  operands[1] = stack_pointer_rtx;
  operands[2] = hard_frame_pointer_rtx;
})

(define_insn "*enter_func"
  [(set (mem:SI (minus:SI (reg:SI 15)
                          (const_int 4)))
        (reg:SI 14))
   (set (reg:SI 14)
        (minus:SI (reg:SI 15)
                  (const_int 4)))
   (set (reg:SI 15)
        (minus:SI (reg:SI 15)
                  (match_operand 0 "immediate_operand" "i")))]
  "reload_completed"
  "enter        #%0"
  [(set_attr "delay_type" "other")]
)

;;}}} \f
;;{{{ Miscellaneous 

;; No operation, needed in case the user uses -g but not -O.
(define_insn "nop"
  [(const_int 0)]
  ""
  "nop"
)

;; Pseudo instruction that prevents the scheduler from moving code above this
;; point.
(define_insn "blockage"
  [(unspec_volatile [(const_int 0)] 0)]
  ""
  ""
  [(set_attr "length" "0")]
)
;;}}} \f
  
;; Local Variables:
;; mode: md
;; folded-file: t
;; End: