;; thumb.md	Machine description for ARM/Thumb processors
;; Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.
;; The basis of this contribution was generated by
;;		Richard Earnshaw, Advanced RISC Machines Ltd

;; This file is part of GNU CC.

;; GNU CC 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 version.

;; GNU CC 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 GNU CC; see the file COPYING.  If not, write to
;; the Free Software Foundation, 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.

;; LENGTH of an instruction is 2 bytes
(define_attr "length" "" (const_int 2))

;; CONDS is set to UNCHANGED when an insn does not affect the condition codes
;; Most insns change the condition codes
(define_attr "conds" "changed,unchanged" (const_string "changed"))

;; FAR_JUMP is "yes" if a BL instruction is used to generate a branch to a
;; distant label.
(define_attr "far_jump" "yes,no" (const_string "no"))

;; Start with move insns

(define_expand "movsi"
  [(set (match_operand:SI 0 "general_operand" "")
	(match_operand:SI 1 "general_operand" ""))]
  ""
  "
  if (! (reload_in_progress || reload_completed))
    {
      if (GET_CODE (operands[0]) != REG)
	operands[1] = force_reg (SImode, operands[1]);
    }
  if (CONSTANT_P (operands[1]) && flag_pic)
    operands[1] = legitimize_pic_address (operands[1], SImode,
					  ((reload_in_progress
					    || reload_completed)
					   ? operands[0] : 0));
")

(define_insn "*movsi_insn"
  [(set (match_operand:SI 0 "nonimmediate_operand" "=l,l,l,l,l,>,l,m,*r,*h")
	(match_operand:SI 1 "general_operand" "l,I,J,K,>,l,mi,l,*h,*r"))]
  "register_operand (operands[0], SImode) 
   || register_operand (operands[1], SImode)"
  "@
   add\\t%0, %1, #0
   mov\\t%0, %1
   #
   #
   ldmia\\t%1, {%0}
   stmia\\t%0, {%1}
   ldr\\t%0, %1
   str\\t%1, %0
   mov\\t%0, %1
   mov\\t%0, %1"
[(set_attr "length" "2,2,4,4,2,2,2,2,2,2")])

(define_split 
  [(set (match_operand:SI 0 "register_operand" "")
	(match_operand:SI 1 "const_int_operand" ""))]
  "thumb_shiftable_const (INTVAL (operands[1]))"
  [(set (match_dup 0) (match_dup 1))
   (set (match_dup 0) (ashift:SI (match_dup 0) (match_dup 2)))]
  "
{
  unsigned HOST_WIDE_INT val = INTVAL (operands[1]);
  unsigned HOST_WIDE_INT mask = 0xff;
  int i;
  for (i = 0; i < 25; i++)
    if ((val & (mask << i)) == val)
      break;

  if (i == 0)
    FAIL;

  operands[1] = GEN_INT (val >> i);
  operands[2] = GEN_INT (i);
}")

(define_split 
  [(set (match_operand:SI 0 "register_operand" "")
	(match_operand:SI 1 "const_int_operand" ""))]
  "INTVAL (operands[1]) < 0 && INTVAL (operands[1]) > -256"
  [(set (match_dup 0) (match_dup 1))
   (set (match_dup 0) (neg:SI (match_dup 0)))]
  "
  operands[1] = GEN_INT (- INTVAL (operands[1]));
")

;;(define_expand "reload_outsi"
;;  [(set (match_operand:SI 2 "register_operand" "=&l")
;;	(match_operand:SI 1 "register_operand" "h"))
;;   (set (match_operand:SI 0 "reload_memory_operand" "=o")
;;	(match_dup 2))]
;;  ""
;;  "
;;/*  thumb_reload_out_si (operands);
;;  DONE; */
;;")

(define_expand "movhi"
  [(set (match_operand:HI 0 "general_operand" "")
	(match_operand:HI 1 "general_operand" ""))]
  ""
  "
{
  if (! (reload_in_progress || reload_completed))
    {
      if (GET_CODE (operands[0]) != REG)
	operands[1] = force_reg (HImode, operands[1]);

      /* ??? We shouldn't really get invalid addresses here, but this can
	 happen if we are passed a SP (never OK for HImode/QImode) or virtual
	register (rejected by GO_IF_LEGITIMATE_ADDRESS for HImode/QImode)
	relative address.  */
      /* ??? This should perhaps be fixed elsewhere, for instance, in
	 fixup_stack_1, by checking for other kinds of invalid addresses,
	 e.g. a bare reference to a virtual register.  This may confuse the
	 alpha though, which must handle this case differently.  */
      if (GET_CODE (operands[0]) == MEM
	  && ! memory_address_p (GET_MODE (operands[0]),
				 XEXP (operands[0], 0)))
	{
	  rtx temp = copy_to_reg (XEXP (operands[0], 0));
	  operands[0] = change_address (operands[0], VOIDmode, temp);
	}
      if (GET_CODE (operands[1]) == MEM
	  && ! memory_address_p (GET_MODE (operands[1]),
				 XEXP (operands[1], 0)))
	{
	  rtx temp = copy_to_reg (XEXP (operands[1], 0));
	  operands[1] = change_address (operands[1], VOIDmode, temp);
	}
    }
  /* Handle loading a large integer during reload */
  else if (GET_CODE (operands[1]) == CONST_INT
	   && ! CONST_OK_FOR_LETTER_P (INTVAL (operands[1]), 'I'))
    {
      /* Writing a constant to memory needs a scratch, which should
	 be handled with SECONDARY_RELOADs.  */
      if (GET_CODE (operands[0]) != REG)
	abort ();

      operands[0] = gen_rtx (SUBREG, SImode, operands[0], 0);
      emit_insn (gen_movsi (operands[0], operands[1]));
      DONE;
    }
}")

(define_insn "*movhi_insn"
  [(set (match_operand:HI 0 "nonimmediate_operand" "=l,l,m,*r,*h,l")
	(match_operand:HI 1 "general_operand"       "l,m,l,*h,*r,I"))]
  "register_operand (operands[0], HImode)
   || register_operand (operands[1], HImode)"
  "@
   add\\t%0, %1, #0
   ldrh\\t%0, %1
   strh\\t%1, %0
   mov\\t%0, %1
   mov\\t%0, %1
   mov\\t%0, %1")

(define_expand "movqi"
  [(set (match_operand:QI 0 "general_operand" "")
	(match_operand:QI 1 "general_operand" ""))]
  ""
  "
{
  if (! (reload_in_progress || reload_completed))
    {
      if (GET_CODE (operands[0]) != REG)
	operands[1] = force_reg (QImode, operands[1]);

      /* ??? We shouldn't really get invalid addresses here, but this can
	 happen if we are passed a SP (never OK for HImode/QImode) or virtual
	register (rejected by GO_IF_LEGITIMATE_ADDRESS for HImode/QImode)
	relative address.  */
      /* ??? This should perhaps be fixed elsewhere, for instance, in
	 fixup_stack_1, by checking for other kinds of invalid addresses,
	 e.g. a bare reference to a virtual register.  This may confuse the
	 alpha though, which must handle this case differently.  */
      if (GET_CODE (operands[0]) == MEM
	  && ! memory_address_p (GET_MODE (operands[0]),
				 XEXP (operands[0], 0)))
	{
	  rtx temp = copy_to_reg (XEXP (operands[0], 0));
	  operands[0] = change_address (operands[0], VOIDmode, temp);
	}
      if (GET_CODE (operands[1]) == MEM
	  && ! memory_address_p (GET_MODE (operands[1]),
				 XEXP (operands[1], 0)))
	{
	  rtx temp = copy_to_reg (XEXP (operands[1], 0));
	  operands[1] = change_address (operands[1], VOIDmode, temp);
	}
    }
  /* Handle loading a large integer during reload */
  else if (GET_CODE (operands[1]) == CONST_INT
	   && ! CONST_OK_FOR_LETTER_P (INTVAL (operands[1]), 'I'))
    {
      /* Writing a constant to memory needs a scratch, which should
	 be handled with SECONDARY_RELOADs.  */
      if (GET_CODE (operands[0]) != REG)
	abort ();

      operands[0] = gen_rtx (SUBREG, SImode, operands[0], 0);
      emit_insn (gen_movsi (operands[0], operands[1]));
      DONE;
    }
}")

(define_insn "*movqi_insn"
  [(set (match_operand:QI 0 "nonimmediate_operand" "=l,l,m,*r,*h,l")
	(match_operand:QI 1 "general_operand" "l,m,l,*h,*r,I"))]
  "register_operand (operands[0], QImode)
   || register_operand (operands[1], QImode)"
  "@
   add\\t%0, %1, #0
   ldrb\\t%0, %1
   strb\\t%1, %0
   mov\\t%0, %1
   mov\\t%0, %1
   mov\\t%0, %1")

(define_expand "movdi"
  [(set (match_operand:DI 0 "general_operand" "")
	(match_operand:DI 1 "general_operand" ""))]
  ""
  "
  if (! (reload_in_progress || reload_completed))
    {
      if (GET_CODE (operands[0]) != REG)
	operands[1] = force_reg (DImode, operands[1]);
    }
")

;;; ??? This should have alternatives for constants.
;;; ??? This was originally identical to the movdf_insn pattern.
;;; ??? The 'i' constraint looks funny, but it should always be replaced by
;;; thumb_reorg with a memory reference.
(define_insn "*movdi_insn"
  [(set (match_operand:DI 0 "general_operand" "=l,l,l,l,>,l,m,*r")
	(match_operand:DI 1 "general_operand" "l,I,J,>,l,mi,l,*r"))]
  "register_operand (operands[0], DImode)
   || register_operand (operands[1], DImode)"
  "*
{
  switch (which_alternative)
    {
    case 0:
      if (REGNO (operands[1]) == REGNO (operands[0]) + 1)
	return \"add\\t%0, %1, #0\;add\\t%H0, %H1, #0\";
      return \"add\\t%H0, %H1, #0\;add\\t%0, %1, #0\";
    case 1:
      return \"mov\\t%Q0, %1\;mov\\t%R0, #0\";
    case 2:
      operands[1] = GEN_INT (- INTVAL (operands[1]));
      return \"mov\\t%Q0, %1\;neg\\t%Q0, %Q0\;asr\\t%R0, %Q0, #31\";
    case 3:
      return \"ldmia\\t%1, {%0, %H0}\";
    case 4:
      return \"stmia\\t%0, {%1, %H1}\";
    case 5:
      return thumb_load_double_from_address (operands);
    case 6:
      operands[2] = gen_rtx (MEM, SImode, plus_constant (XEXP (operands[0], 0), 4));
      output_asm_insn (\"str\\t%1, %0\;str\\t%H1, %2\", operands);
      return \"\";
    case 7:
      if (REGNO (operands[1]) == REGNO (operands[0]) + 1)
	return \"mov\\t%0, %1\;mov\\t%H0, %H1\";
      return \"mov\\t%H0, %H1\;mov\\t%0, %1\";
    }
}"[(set_attr "length" "4,4,6,2,2,6,4,4")])

(define_expand "movdf"
  [(set (match_operand:DF 0 "general_operand" "")
	(match_operand:DF 1 "general_operand" ""))]
  ""
  "
  if (! (reload_in_progress || reload_completed))
    {
      if (GET_CODE (operands[0]) != REG)
	operands[1] = force_reg (DFmode, operands[1]);
    }
")

;;; ??? This should have alternatives for constants.
;;; ??? This was originally identical to the movdi_insn pattern.
;;; ??? The 'F' constraint looks funny, but it should always be replaced by
;;; thumb_reorg with a memory reference.
(define_insn "*movdf_insn"
  [(set (match_operand:DF 0 "general_operand" "=l,l,>,l,m,*r")
	(match_operand:DF 1 "general_operand"  "l,>,l,mF,l,*r"))]
  "register_operand (operands[0], DFmode)
   || register_operand (operands[1], DFmode)"
  "*
  switch (which_alternative)
    {
    case 0:
      if (REGNO (operands[1]) == REGNO (operands[0]) + 1)
	return \"add\\t%0, %1, #0\;add\\t%H0, %H1, #0\";
      return \"add\\t%H0, %H1, #0\;add\\t%0, %1, #0\";
    case 1:
      return \"ldmia\\t%1, {%0, %H0}\";
    case 2:
      return \"stmia\\t%0, {%1, %H1}\";
    case 3:
      return thumb_load_double_from_address (operands);
    case 4:
      operands[2] = gen_rtx (MEM, SImode, plus_constant (XEXP (operands[0], 0), 4));
      output_asm_insn (\"str\\t%1, %0\;str\\t%H1, %2\", operands);
      return \"\";
    case 5:
      if (REGNO (operands[1]) == REGNO (operands[0]) + 1)
	return \"mov\\t%0, %1\;mov\\t%H0, %H1\";
      return \"mov\\t%H0, %H1\;mov\\t%0, %1\";
    }
"[(set_attr "length" "4,2,2,6,4,4")])

(define_expand "movsf"
  [(set (match_operand:SF 0 "general_operand" "")
	(match_operand:SF 1 "general_operand" ""))]
  ""
  "
  if (! (reload_in_progress || reload_completed))
    {
      if (GET_CODE (operands[0]) != REG)
	operands[1] = force_reg (SFmode, operands[1]);
    }
")

;;; ??? This should have alternatives for constants.
(define_insn "*movsf_insn"
  [(set (match_operand:SF 0 "nonimmediate_operand" "=l,l,>,l,m,*r,*h")
	(match_operand:SF 1 "general_operand"       "l,>,l,mF,l,*h,*r"))]
  "register_operand (operands[0], SFmode) 
   || register_operand (operands[1], SFmode)"
  "@
   add\\t%0, %1, #0
   ldmia\\t%1, {%0}
   stmia\\t%0, {%1}
   ldr\\t%0, %1
   str\\t%1, %0
   mov\\t%0, %1
   mov\\t%0, %1")

;; Widening move insns

(define_expand "zero_extendhisi2"
  [(set (match_operand:SI 0 "register_operand" "")
	(zero_extend:SI (match_operand:HI 1 "nonimmediate_operand" "")))]
  ""
  "
  if (GET_CODE (operands[1]) != MEM)
    {
      rtx temp = gen_reg_rtx (SImode);
      
      operands[1] = force_reg (HImode, operands[1]);
      operands[1] = gen_lowpart (SImode, operands[1]);
      emit_insn (gen_ashlsi3 (temp, operands[1], GEN_INT (16)));
      emit_insn (gen_lshrsi3 (operands[0], temp, GEN_INT (16)));
      DONE;
    }
")

(define_insn "*zero_extendhisi2_insn"
  [(set (match_operand:SI 0 "register_operand" "=l")
	(zero_extend:SI (match_operand:HI 1 "memory_operand" "m")))]
  ""
  "ldrh\\t%0, %1")

(define_expand "zero_extendqisi2"
  [(set (match_operand:SI 0 "register_operand" "")
	(zero_extend:SI (match_operand:QI 1 "nonimmediate_operand" "")))]
  ""
  "
  if (GET_CODE (operands[1]) != MEM)
    {
      rtx temp = gen_reg_rtx (SImode);

      operands[1] = force_reg (QImode, operands[1]);
      operands[1] = gen_lowpart (SImode, operands[1]);
      emit_insn (gen_ashlsi3 (temp, operands[1], GEN_INT (24)));
      emit_insn (gen_lshrsi3 (operands[0], temp, GEN_INT (24)));
      DONE;
    }
")

(define_insn "*zero_extendqisi2_insn"
  [(set (match_operand:SI 0 "register_operand" "=l")
	(zero_extend:SI (match_operand:QI 1 "memory_operand" "m")))]
  ""
  "ldrb\\t%0, %1")

(define_expand "extendhisi2"
  [(parallel [(set (match_operand:SI 0 "register_operand" "")
		   (sign_extend:SI (match_operand:HI 1 "nonimmediate_operand" "")))
	      (clobber (match_scratch:SI 2 ""))])]
  ""
  "
  if (GET_CODE (operands[1]) != MEM)
    {
      rtx temp = gen_reg_rtx (SImode);
      
      operands[1] = force_reg (HImode, operands[1]);
      operands[1] = gen_lowpart (SImode, operands[1]);
      emit_insn (gen_ashlsi3 (temp, operands[1], GEN_INT (16)));
      emit_insn (gen_ashrsi3 (operands[0], temp, GEN_INT (16)));
      DONE;
    }
")

(define_insn "*extendhisi2_insn"
  [(set (match_operand:SI 0 "register_operand" "=l")
	(sign_extend:SI (match_operand:HI 1 "memory_operand" "m")))
   (clobber (match_scratch:SI 2 "=&l"))]
  ""
  "*
{
  rtx ops[4];
  /* This code used to try to use 'V', and fix the address only if it was
     offsettable, but this fails for e.g. REG+48 because 48 is outside the
     range of QImode offsets, and offsettable_address_p does a QImode
     address check.  */

  if (GET_CODE (XEXP (operands[1], 0)) == PLUS)
    {
      ops[1] = XEXP (XEXP (operands[1], 0), 0);
      ops[2] = XEXP (XEXP (operands[1], 0), 1);
    }
  else
    {
      ops[1] = XEXP (operands[1], 0);
      ops[2] = const0_rtx;
    }
  if (GET_CODE (ops[2]) == REG)
    return \"ldrsh\\t%0, %1\";

  ops[0] = operands[0];
  ops[3] = operands[2];
  output_asm_insn (\"mov\\t%3, %2\;ldrsh\\t%0, [%1, %3]\", ops);
  return \"\";
}"
[(set_attr "length" "4")])

(define_expand "extendqisi2"
  [(set (match_operand:SI 0 "register_operand" "")
	(sign_extend:SI (match_operand:QI 1 "nonimmediate_operand" "")))]
  ""
  "
  if (GET_CODE (operands[1]) != MEM)
    {
      rtx temp = gen_reg_rtx (SImode);

      operands[1] = force_reg (QImode, operands[1]);
      operands[1] = gen_lowpart (SImode, operands[1]);
      emit_insn (gen_ashlsi3 (temp, operands[1], GEN_INT (24)));
      emit_insn (gen_ashrsi3 (operands[0], temp, GEN_INT (24)));
      DONE;
    }
")

(define_insn "*extendqisi2_insn"
  [(set (match_operand:SI 0 "register_operand" "=l,l")
	(sign_extend:SI (match_operand:QI 1 "memory_operand" "V,m")))]
  ""
  "*
{
  rtx ops[3];

  if (which_alternative == 0)
    return \"ldrsb\\t%0, %1\";
  ops[0] = operands[0];
  if (GET_CODE (XEXP (operands[1], 0)) == PLUS)
    {
      ops[1] = XEXP (XEXP (operands[1], 0), 0);
      ops[2] = XEXP (XEXP (operands[1], 0), 1);
      
      if (GET_CODE (ops[1]) == REG && GET_CODE (ops[2]) == REG)
        output_asm_insn (\"ldrsb\\t%0, [%1, %2]\", ops);
      else if (GET_CODE (ops[1]) == REG)
        {
          if (REGNO (ops[1]) == REGNO (operands[0]))
            output_asm_insn (\"ldrb\\t%0, [%1, %2]\;lsl\\t%0, %0, #24\;asr\\t%0, %0, #24\", ops);
	  else
            output_asm_insn (\"mov\\t%0, %2\;ldrsb\\t%0, [%1, %0]\", ops);
	}
      else
        {
          if (REGNO (ops[2]) == REGNO (operands[0]))
            output_asm_insn (\"ldrb\\t%0, [%2, %1]\;lsl\\t%0, %0, #24\;asr\\t%0, %0, #24\", ops);
	  else
            output_asm_insn (\"mov\\t%0, %2\;ldrsb\\t%0, [%1, %0]\", ops);
        }
    }
  else if (REGNO (operands[0]) == REGNO (XEXP (operands[1], 0)))
    {
      output_asm_insn (\"ldrb\\t%0, [%0, #0]\;lsl\\t%0, %0, #24\;asr\\t%0, %0, #24\", ops);
    }
  else
    {
      ops[1] = XEXP (operands[1], 0);
      ops[2] = const0_rtx;
      output_asm_insn (\"mov\\t%0, %2\;ldrsb\\t%0, [%1, %0]\", ops);
    }
  return \"\";
}"
[(set_attr "length" "2,6")])

;; We don't really have extzv, but defining this using shifts helps
;; to reduce register pressure later on.

(define_expand "extzv"
  [(set (match_dup 4)
	(ashift:SI (match_operand:SI 1 "register_operand" "")
		   (match_operand:SI 2 "const_int_operand" "")))
   (set (match_operand:SI 0 "register_operand" "")
	(lshiftrt:SI (match_dup 4)
		     (match_operand:SI 3 "const_int_operand" "")))]
  ""
  "
{
  HOST_WIDE_INT lshift = 32 - INTVAL (operands[2]) - INTVAL (operands[3]);
  HOST_WIDE_INT rshift = 32 - INTVAL (operands[2]);
  operands[3] = GEN_INT (rshift);
  if (lshift == 0)
    {
      emit_insn (gen_lshrsi3 (operands[0], operands[1], operands[3]));
      DONE;
    }
  operands[2] = GEN_INT (lshift);
  operands[4] = gen_reg_rtx (SImode);
}
")

;; Block-move insns

(define_expand "movstrqi"
  [(match_operand:BLK 0 "general_operand" "")
   (match_operand:BLK 1 "general_operand" "")
   (match_operand:SI 2 "" "")
   (match_operand:SI 3 "const_int_operand" "")]
  ""
  "
  if (INTVAL (operands[3]) != 4
      || GET_CODE (operands[2]) != CONST_INT
      || INTVAL (operands[2]) > 48)
    FAIL;

  thumb_expand_movstrqi (operands);
  DONE;
")

(define_insn "movmem12b"
  [(set (mem:SI (match_operand:SI 0 "register_operand" "+&l"))
	(mem:SI (match_operand:SI 1 "register_operand" "+&l")))
   (set (mem:SI (plus:SI (match_dup 0) (const_int 4)))
	(mem:SI (plus:SI (match_dup 1) (const_int 4))))
   (set (mem:SI (plus:SI (match_dup 0) (const_int 8)))
	(mem:SI (plus:SI (match_dup 1) (const_int 8))))
   (set (match_dup 0) (plus:SI (match_dup 0) (const_int 12)))
   (set (match_dup 1) (plus:SI (match_dup 1) (const_int 12)))
   (clobber (match_scratch:SI 2 "=&l"))
   (clobber (match_scratch:SI 3 "=&l"))
   (clobber (match_scratch:SI 4 "=&l"))]
  ""
  "* return output_move_mem_multiple (3, operands);"
[(set_attr "length" "4")])

(define_insn "movmem8b"
  [(set (mem:SI (match_operand:SI 0 "register_operand" "+&l"))
	(mem:SI (match_operand:SI 1 "register_operand" "+&l")))
   (set (mem:SI (plus:SI (match_dup 0) (const_int 4)))
	(mem:SI (plus:SI (match_dup 1) (const_int 4))))
   (set (match_dup 0) (plus:SI (match_dup 0) (const_int 8)))
   (set (match_dup 1) (plus:SI (match_dup 1) (const_int 8)))
   (clobber (match_scratch:SI 2 "=&l"))
   (clobber (match_scratch:SI 3 "=&l"))]
  ""
  "* return output_move_mem_multiple (2, operands);"
[(set_attr "length" "4")])

;; Arithmetic insns

(define_insn "adddi3"
  [(set (match_operand:DI 0 "register_operand" "=l")
	(plus:DI (match_operand:DI 1 "register_operand" "%0")
		 (match_operand:DI 2 "register_operand" "l")))]
  ""
  "add\\t%Q0, %Q0, %Q2\;adc\\t%R0, %R0, %R2"
[(set_attr "conds" "changed")
 (set_attr "length" "8")])

;; register group 'k' is a single register group containing only the stack
;; register.  Trying to reload it will always fail catastrophically,
;; so never allow those alternatives to match if reloading is needed.
(define_insn "addsi3"
  [(set (match_operand:SI 0 "register_operand" "=l,l,l,*r,*h,l,!k")
	(plus:SI (match_operand:SI 1 "register_operand" "%0,0,l,*0,*0,!k,!k")
		 (match_operand:SI 2 "nonmemory_operand" "I,J,lL,*h,*r,!M,!O")))]
  ""
  "*
   static char *asms[] = 
{
  \"add\\t%0, %0, %2\",
  \"sub\\t%0, %0, #%n2\",
  \"add\\t%0, %1, %2\",
  \"add\\t%0, %0, %2\",
  \"add\\t%0, %0, %2\",
  \"add\\t%0, %1, %2\",
  \"add\\t%0, %1, %2\"
};
  if (which_alternative == 2 && GET_CODE (operands[2]) == CONST_INT
      && INTVAL (operands[2]) < 0)
    return \"sub\\t%0, %1, #%n2\";
  return asms[which_alternative];
")

; reloading and elimination of the frame pointer can sometimes cause this
; optimization to be missed.
(define_peephole
  [(set (match_operand:SI 0 "register_operand" "=l")
	(match_operand:SI 1 "const_int_operand" "M"))
   (set (match_dup 0)
	(plus:SI (match_dup 0) (match_operand:SI 2 "register_operand" "k")))]
  "REGNO (operands[2]) == STACK_POINTER_REGNUM 
   && (unsigned HOST_WIDE_INT) (INTVAL (operands[1])) < 1024
   && (INTVAL (operands[1]) & 3) == 0"
  "add\\t%0, %2, %1")

(define_insn "subdi3"
  [(set (match_operand:DI 0 "register_operand" "=l")
	(minus:DI (match_operand:DI 1 "register_operand" "0")
		 (match_operand:DI 2 "register_operand" "l")))]
  ""
  "sub\\t%Q0, %Q0, %Q2\;sbc\\t%R0, %R0, %R2"
[(set_attr "conds" "changed")
 (set_attr "length" "8")])

(define_insn "subsi3"
  [(set (match_operand:SI 0 "register_operand" "=l")
	(minus:SI (match_operand:SI 1 "register_operand" "l")
		  (match_operand:SI 2 "register_operand" "l")))]
  ""
  "sub\\t%0, %1, %2")

;; We must ensure that one input matches the output, and that the other input
;; does not match the output.  Using 0 satisfies the first, and using &
;; satisfies the second.  Unfortunately, this fails when operands 1 and 2
;; are the same, because reload will make operand 0 match operand 1 without
;; realizing that this conflicts with operand 2.  We fix this by adding another
;; alternative to match this case, and then `reload' it ourselves.  This
;; alternative must come first.
(define_insn "mulsi3"
  [(set (match_operand:SI 0 "register_operand" "=&l,&l,&l")
	(mult:SI (match_operand:SI 1 "register_operand" "%l,*h,0")
		 (match_operand:SI 2 "register_operand" "l,l,l")))]
  ""
  "*
{
  if (which_alternative < 2)
    return \"mov\\t%0, %1\;mul\\t%0, %0, %2\";
  else
    return \"mul\\t%0, %0, %2\";
}"
  [(set_attr "length" "4,4,2")])

(define_insn "negsi2"
  [(set (match_operand:SI 0 "register_operand" "=l")
	(neg:SI (match_operand:SI 1 "register_operand" "l")))]
  ""
  "neg\\t%0, %1")

;; Logical insns

(define_expand "andsi3"
  [(set (match_operand:SI 0 "register_operand" "")
	(and:SI (match_operand:SI 1 "register_operand" "")
		(match_operand:SI 2 "nonmemory_operand" "")))]
  ""
  "
  if (GET_CODE (operands[2]) != CONST_INT)
    operands[2] = force_reg (SImode, operands[2]);
  else
    {
      int i;
      if (((unsigned HOST_WIDE_INT) ~ INTVAL (operands[2])) < 256)
	{
	  operands[2] = force_reg (SImode, GEN_INT (~INTVAL (operands[2])));
	  emit_insn (gen_bicsi3 (operands[0], operands[2], operands[1]));
	  DONE;
	}

      for (i = 9; i <= 31; i++)
	if ((((HOST_WIDE_INT) 1) << i) - 1 == INTVAL (operands[2]))
	  {
	    emit_insn (gen_extzv (operands[0], operands[1], GEN_INT (i),
				  const0_rtx));
	    DONE;
	  }
	else if ((((HOST_WIDE_INT) 1) << i) - 1 == ~ INTVAL (operands[2]))
	  {
	    rtx shift = GEN_INT (i);
	    rtx reg = gen_reg_rtx (SImode);
	    emit_insn (gen_lshrsi3 (reg, operands[1], shift));
	    emit_insn (gen_ashlsi3 (operands[0], reg, shift));
	    DONE;
	  }

      operands[2] = force_reg (SImode, operands[2]);
    }
")

(define_insn "*andsi3_insn"
  [(set (match_operand:SI 0 "register_operand" "=l")
	(and:SI (match_operand:SI 1 "register_operand" "%0")
		(match_operand:SI 2 "register_operand" "l")))]
  ""
  "and\\t%0, %0, %2")

(define_insn "bicsi3"
  [(set (match_operand:SI 0 "register_operand" "=l")
	(and:SI (not:SI (match_operand:SI 1 "register_operand" "l"))
		(match_operand:SI 2 "register_operand" "0")))]
  ""
  "bic\\t%0, %0, %1")

(define_insn "iorsi3"
  [(set (match_operand:SI 0 "register_operand" "=l")
	(ior:SI (match_operand:SI 1 "register_operand" "%0")
		(match_operand:SI 2 "register_operand" "l")))]
  ""
  "orr\\t%0, %0, %2")

(define_insn "xorsi3"
  [(set (match_operand:SI 0 "register_operand" "=l")
	(xor:SI (match_operand:SI 1 "register_operand" "%0")
		(match_operand:SI 2 "register_operand" "l")))]
  ""
  "eor\\t%0, %0, %2")

(define_insn "one_cmplsi2"
  [(set (match_operand:SI 0 "register_operand" "=l")
	(not:SI (match_operand:SI 1 "register_operand" "l")))]
  ""
  "mvn\\t%0, %1")

;; Shift and rotation insns

(define_insn "ashlsi3"
  [(set (match_operand:SI 0 "register_operand" "=l,l")
	(ashift:SI (match_operand:SI 1 "register_operand" "l,0")
		   (match_operand:SI 2 "nonmemory_operand" "N,l")))]
  ""
  "@
   lsl\\t%0, %1, %2
   lsl\\t%0, %0, %2")

(define_insn "ashrsi3"
  [(set (match_operand:SI 0 "register_operand" "=l,l")
	(ashiftrt:SI (match_operand:SI 1 "register_operand" "l,0")
		     (match_operand:SI 2 "nonmemory_operand" "N,l")))]
  ""
  "@
   asr\\t%0, %1, %2
   asr\\t%0, %0, %2")

(define_insn "lshrsi3"
  [(set (match_operand:SI 0 "register_operand" "=l,l")
	(lshiftrt:SI (match_operand:SI 1 "register_operand" "l,0")
		     (match_operand:SI 2 "nonmemory_operand" "N,l")))]
  ""
  "@
   lsr\\t%0, %1, %2
   lsr\\t%0, %0, %2")

(define_insn "rotrsi3"
  [(set (match_operand:SI 0 "register_operand" "=l")
	(rotatert:SI (match_operand:SI 1 "register_operand" "0")
		     (match_operand:SI 2 "register_operand" "l")))]
  ""
  "ror\\t%0, %0, %2")

;; Comparison insns

(define_expand "cmpsi"
  [(set (cc0) (compare (match_operand:SI 0 "register_operand" "")
		       (match_operand:SI 1 "nonmemory_operand" "")))]
  ""
  "
  if (GET_CODE (operands[1]) != REG && GET_CODE (operands[1]) != SUBREG)
    {
      if (GET_CODE (operands[1]) != CONST_INT
	  || (unsigned HOST_WIDE_INT) (INTVAL (operands[1])) >= 256)
	{
	  if (GET_CODE (operands[1]) != CONST_INT
	      || INTVAL (operands[1]) < -255
	      || INTVAL (operands[1]) > 0)
	    operands[1] = force_reg (SImode, operands[1]);
	  else
	    {
	      operands[1] = force_reg (SImode, 
				       GEN_INT (- INTVAL (operands[1])));
	      emit_insn (gen_cmnsi (operands[0], operands[1]));
	      DONE;
	    }
        }
    }
")

(define_insn "*cmpsi_insn"
  [(set (cc0) (compare (match_operand:SI 0 "register_operand" "l,*r,*h")
		       (match_operand:SI 1 "thumb_cmp_operand" "lI,*h,*r")))]
  ""
  "@
   cmp\\t%0, %1
   cmp\\t%0, %1
   cmp\\t%0, %1")

(define_insn "tstsi"
  [(set (cc0) (match_operand:SI 0 "register_operand" "l"))]
  ""
  "cmp\\t%0, #0")

(define_insn "cmnsi"
  [(set (cc0) (compare (match_operand:SI 0 "register_operand" "l")
		       (neg:SI (match_operand:SI 1 "register_operand" "l"))))]
  ""
  "cmn\\t%0, %1")

;; Jump insns

(define_insn "jump"
  [(set (pc) (label_ref (match_operand 0 "" "")))]
  ""
  "*
  if (get_attr_length (insn) == 2)
    return \"b\\t%l0\";
  return \"bl\\t%l0\\t%@ far jump\";
"[(set (attr "far_jump")
       (if_then_else (eq_attr "length" "4")
		     (const_string "yes")
		     (const_string "no")))
  (set (attr "length") 
       (if_then_else (and (ge (minus (match_dup 0) (pc)) (const_int -2048))
			  (le (minus (match_dup 0) (pc)) (const_int 2044)))
		     (const_int 2)
		     (const_int 4)))])


(define_expand "beq"
  [(set (pc) (if_then_else (eq (cc0) (const_int 0))
			   (label_ref (match_operand 0 "" ""))
			   (pc)))]
  ""
  "")

(define_expand "bne"
  [(set (pc) (if_then_else (ne (cc0) (const_int 0))
			   (label_ref (match_operand 0 "" ""))
			   (pc)))]
  ""
  "")

(define_expand "bge"
  [(set (pc) (if_then_else (ge (cc0) (const_int 0))
			   (label_ref (match_operand 0 "" ""))
			   (pc)))]
  ""
  "")

(define_expand "ble"
  [(set (pc) (if_then_else (le (cc0) (const_int 0))
			   (label_ref (match_operand 0 "" ""))
			   (pc)))]
  ""
  "")

(define_expand "bgt"
  [(set (pc) (if_then_else (gt (cc0) (const_int 0))
			   (label_ref (match_operand 0 "" ""))
			   (pc)))]
  ""
  "")

(define_expand "blt"
  [(set (pc) (if_then_else (lt (cc0) (const_int 0))
			   (label_ref (match_operand 0 "" ""))
			   (pc)))]
  ""
  "")

(define_expand "bgeu"
  [(set (pc) (if_then_else (geu (cc0) (const_int 0))
			   (label_ref (match_operand 0 "" ""))
			   (pc)))]
  ""
  "")

(define_expand "bleu"
  [(set (pc) (if_then_else (leu (cc0) (const_int 0))
			   (label_ref (match_operand 0 "" ""))
			   (pc)))]
  ""
  "")

(define_expand "bgtu"
  [(set (pc) (if_then_else (gtu (cc0) (const_int 0))
			   (label_ref (match_operand 0 "" ""))
			   (pc)))]
  ""
  "")

(define_expand "bltu"
  [(set (pc) (if_then_else (ltu (cc0) (const_int 0))
			   (label_ref (match_operand 0 "" ""))
			   (pc)))]
  ""
  "")

(define_insn "*cond_branch"
  [(set (pc) (if_then_else (match_operator 1 "comparison_operator"
			    [(cc0) (const_int 0)])
			   (label_ref (match_operand 0 "" ""))
			   (pc)))]
  ""
  "*
  switch (get_attr_length (insn))
    {
    case 2:  return \"b%d1\\t%l0\\t%@cond_branch\";
    case 4:  return \"b%D1\\t.LCB%=\;b\\t%l0\\t%@long jump\\n.LCB%=:\";
    default: return \"b%D1\\t.LCB%=\;bl\\t%l0\\t%@far jump\\n.LCB%=:\";
    }
"[(set (attr "far_jump")
       (if_then_else (eq_attr "length" "6")
		     (const_string "yes")
		     (const_string "no")))
  (set (attr "length") 
       (if_then_else
	(and (ge (minus (match_dup 0) (pc)) (const_int -252))
	     (le (minus (match_dup 0) (pc)) (const_int 254)))
	(const_int 2)
	(if_then_else (and (ge (minus (match_dup 0) (pc)) (const_int -2044))
			   (le (minus (match_dup 0) (pc)) (const_int 2044)))
		      (const_int 4)
		      (const_int 6))))])

(define_insn "*cond_branch_reversed"
  [(set (pc) (if_then_else (match_operator 1 "comparison_operator"
			    [(cc0) (const_int 0)])
			   (pc)
			   (label_ref (match_operand 0 "" ""))))]
  ""
  "*
  switch (get_attr_length (insn))
    {
    case 2:  return \"b%D1\\t%l0\\t%@cond_branch_reversed\";
    case 4:  return \"b%d1\\t.LCBR%=\;b\\t%l0\\t%@long jump\\n.LCBR%=:\";
    default: return \"b%d1\\t.LCBR%=\;bl\\t%l0\\t%@far jump\\n.LCBR%=:\";
    }
  return \"\";
"[(set (attr "far_jump")
       (if_then_else (eq_attr "length" "6")
		     (const_string "yes")
		     (const_string "no")))
   (set (attr "length") 
       (if_then_else
	(and (ge (minus (match_dup 0) (pc)) (const_int -252))
	     (le (minus (match_dup 0) (pc)) (const_int 254)))
	(const_int 2)
	(if_then_else (and (ge (minus (match_dup 0) (pc)) (const_int -2044))
			   (le (minus (match_dup 0) (pc)) (const_int 2044)))
		      (const_int 4)
		      (const_int 6))))])

(define_insn "indirect_jump"
  [(set (pc) (match_operand:SI 0 "register_operand" "l*r"))]
  ""
  "mov\\tpc, %0")

(define_insn "tablejump"
  [(set (pc) (match_operand:SI 0 "register_operand" "l*r"))
   (use (label_ref (match_operand 1 "" "")))]
  ""
  "mov\\tpc, %0")

(define_insn "return"
  [(return)]
  "USE_RETURN"
  "* return output_return ();"
[(set_attr "length" "18")])

;; Call insns

(define_expand "call"
  [(call (match_operand:SI 0 "memory_operand" "")
	 (match_operand 1 "" ""))]
  ""
  "")

(define_insn "*call_indirect"
  [(call (mem:SI (match_operand:SI 0 "register_operand" "l*r"))
	 (match_operand 1 "" ""))]
  "! TARGET_CALLER_INTERWORKING"
  "bl\\t%__call_via_%0"
[(set_attr "length" "4")])
;; The non THUMB_INTERWORK, non TARGET_CALLER_INTERWORKING version
;; used to be: "mov\\tlr,pc\;bx\\t%0", but the mov does not set
;; the bottom bit of lr so that a function return (using bx)
;; would switch back into ARM mode...

(define_insn "*call_indirect_interwork"
  [(call (mem:SI (match_operand:SI 0 "register_operand" "l*r"))
	 (match_operand 1 "" ""))]
  "TARGET_CALLER_INTERWORKING"
  "bl\\t%__interwork_call_via_%0"
[(set_attr "length" "4")])

(define_expand "call_value"
  [(set (match_operand 0 "" "")
	(call (match_operand 1 "memory_operand" "")
	      (match_operand 2 "" "")))]
  ""
  "")

(define_insn "*call_value_indirect"
  [(set (match_operand 0 "" "=l")
	(call (mem:SI (match_operand:SI 1 "register_operand" "l*r"))
	      (match_operand 2 "" "")))]
  "! TARGET_CALLER_INTERWORKING"
  "bl\\t%__call_via_%1"
[(set_attr "length" "4")])
;; See comment for call_indirect pattern

(define_insn "*call_value_indirect_interwork"
  [(set (match_operand 0 "" "=l")
	(call (mem:SI (match_operand:SI 1 "register_operand" "l*r"))
	      (match_operand 2 "" "")))]
  "TARGET_CALLER_INTERWORKING"
  "bl\\t%__interwork_call_via_%1"
[(set_attr "length" "4")])


(define_insn "*call_insn"
  [(call (mem:SI (match_operand:SI 0 "" "X"))
	 (match_operand:SI 1 "" ""))]
  "GET_CODE (operands[0]) == SYMBOL_REF"
  "bl\\t%a0"
[(set_attr "length" "4")])

(define_insn "*call_value_insn"
  [(set (match_operand 0 "register_operand" "=l")
	(call (mem:SI (match_operand 1 "" "X"))
	      (match_operand 2 "" "")))]
  "GET_CODE (operands[1]) == SYMBOL_REF"
  "bl\\t%a1"
[(set_attr "length" "4")])

;; Untyped call not required, since all funcs return in r0

;; Miscellaneous patterns

(define_insn "nop"
  [(clobber (const_int 0))]
  ""
  "mov\\tr8, r8")

(define_insn "blockage"
  [(unspec_volatile [(const_int 0)] 0)]
  ""
  ""
  [(set_attr "length" "0")])

(define_expand "prologue"
  [(const_int 0)]
  ""
  "
  thumb_expand_prologue ();
  DONE;
")

(define_expand "epilogue"
  [(unspec_volatile [(const_int 0)] 1)]
  "! thumb_trivial_epilogue ()"
  "
  thumb_expand_epilogue ();
")

(define_insn "*epilogue_insns"
  [(unspec_volatile [(const_int 0)] 1)]
  ""
  "*
  return thumb_unexpanded_epilogue ();
"
[(set_attr "length" "42")])

;; Special patterns for dealing with the constant pool

(define_insn "consttable_4"
 [(unspec_volatile [(match_operand 0 "" "")] 2)]
 ""
 "*
{
  making_const_table = TRUE;
  switch (GET_MODE_CLASS (GET_MODE (operands[0])))
    {
    case MODE_FLOAT:
    {
      union real_extract u;
      bcopy ((char *) &CONST_DOUBLE_LOW (operands[0]), (char *) &u, sizeof u);
      assemble_real (u.d, GET_MODE (operands[0]));
      break;
    }
    default:
      assemble_integer (operands[0], 4, 1);
      break;
    }
  return \"\";
}"
[(set_attr "length" "4")])

(define_insn "consttable_8"
 [(unspec_volatile [(match_operand 0 "" "")] 3)]
 ""
 "*
{
  making_const_table = TRUE;
  switch (GET_MODE_CLASS (GET_MODE (operands[0])))
    {
    case MODE_FLOAT:
    {
      union real_extract u;
      bcopy ((char *) &CONST_DOUBLE_LOW (operands[0]), (char *) &u, sizeof u);
      assemble_real (u.d, GET_MODE (operands[0]));
      break;
    }
    default:
      assemble_integer (operands[0], 8, 1);
      break;
    }
  return \"\";
}"
[(set_attr "length" "8")])

(define_insn "consttable_end"
  [(unspec_volatile [(const_int 0)] 4)]
  ""
  "*
  making_const_table = FALSE;
  return \"\";
")

(define_insn "align_4"
 [(unspec_volatile [(const_int 0)] 5)]
 ""
 "*
   assemble_align (32);
   return \"\";
")

/* When generating pic, we need to load the symbol offset into a register.
   So that the optimizer does not confuse this with a normal symbol load
   we use an unspec.  The offset will be loaded from a constant pool entry,
   since that is the only type of relocation we can use.  */

(define_insn "pic_load_addr"
  [(set (match_operand:SI 0 "register_operand" "=r")
	(unspec:SI [(match_operand 1 "" "")] 3))]
  "flag_pic"
  "ldr\\t%0, %a1")

(define_insn "pic_add_dot_plus_four"
  [(set (match_operand 0 "register_operand" "+r")
	(plus:SI (match_dup 0) (const (plus:SI (pc) (const_int 4)))))
   (use (label_ref (match_operand 1 "" "")))]
  "flag_pic"
  "*
  ASM_OUTPUT_INTERNAL_LABEL (asm_out_file, \"L\",
			     CODE_LABEL_NUMBER (operands[1]));
  return \"add\\t%0, %|pc\";
")

