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1 709 jeremybenn 
;; Machine Descriptions for R8C/M16C/M32C
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;; Copyright (C) 2005, 2007, 2008
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;; Free Software Foundation, Inc.
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;; Contributed by Red Hat.
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;;
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;; This file is part of GCC.
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;;
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;; GCC is free software; you can redistribute it and/or modify it
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;; under the terms of the GNU General Public License as published
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;; by the Free Software Foundation; either version 3, or (at your
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;; option) any later version.
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;;
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;; GCC is distributed in the hope that it will be useful, but WITHOUT
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;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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;; or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
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;; License for more details.
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;;
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;; You should have received a copy of the GNU General Public License
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;; along with GCC; see the file COPYING3.  If not see
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;; .
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;; Prologue and epilogue patterns
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(define_expand "prologue"
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  [(const_int 1)]
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  ""
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  "m32c_emit_prologue(); DONE;"
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  )
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; For the next two, operands[0] is the amount of stack space we want
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; to reserve.
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; We assume dwarf2out will process each set in sequence.
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(define_insn "prologue_enter_16"
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  [(set (mem:HI (plus:HI (reg:HI SP_REGNO) (const_int -2)))
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        (reg:HI FB_REGNO))
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   (set (reg:HI FB_REGNO)
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        (plus:HI (reg:HI SP_REGNO) (const_int -2)))
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   (set (reg:HI SP_REGNO)
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        (minus:HI (reg:HI SP_REGNO)
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                   (match_operand 0 "const_int_operand" "i")))
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   ]
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  "TARGET_A16"
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  {
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    /* This is due to binutils bug gas/4659.  */
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    if (INTVAL (operands[0]) == 2)
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      return "enter\t#0";
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    return "enter\t%0-2";
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  }
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  [(set_attr "flags" "x")]
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  )
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(define_insn "prologue_enter_24"
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  [(set (mem:SI (plus:PSI (reg:PSI SP_REGNO) (const_int -4)))
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        (reg:SI FB_REGNO))
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   (set (reg:PSI FB_REGNO)
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        (plus:PSI (reg:PSI SP_REGNO) (const_int -4)))
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   (set (reg:PSI SP_REGNO)
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        (minus:PSI (reg:PSI SP_REGNO)
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                   (match_operand 0 "const_int_operand" "i")))
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   ]
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  "TARGET_A24"
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  {
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    /* This is due to binutils bug gas/4659.  */
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    if (INTVAL (operands[0]) == 4)
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      return "enter\t#0";
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    return "enter\t%0-4";
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  }
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  [(set_attr "flags" "x")]
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  )
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; Just a comment, for debugging the assembler output.
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(define_insn "prologue_end"
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  [(unspec_volatile [(const_int 0)] UNS_PROLOGUE_END)]
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  ""
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  "; end of prologue"
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  [(set_attr "flags" "n")]
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  )
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(define_expand "epilogue"
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  [(const_int 1)]
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  ""
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  "m32c_emit_epilogue(); DONE;"
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  )
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(define_expand "eh_return"
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  [(match_operand:PSI 0 "" "")]
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  ""
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  "m32c_emit_eh_epilogue(operands[0]);
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   emit_barrier ();
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   DONE;"
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  )
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(define_insn "eh_epilogue"
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  [(set (pc)
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        (unspec_volatile [(match_operand 0 "m32c_r1_operand" "")
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                          (match_operand 1 "m32c_r0_operand" "")
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                          ] UNS_EH_EPILOGUE))
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   (return)]
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  ""
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  "jmp.a\t__m32c_eh_return"
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  [(set_attr "flags" "x")]
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  )
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(define_insn "epilogue_exitd_16"
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  [(set (reg:HI SP_REGNO)
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        (plus:HI (reg:HI FB_REGNO)
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              (const_int 2)))
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   (set (reg:HI FB_REGNO)
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        (mem:HI (reg:HI FB_REGNO)))
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   (return)
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   ]
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  "TARGET_A16"
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  "exitd"
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  [(set_attr "flags" "x")]
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  )
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(define_insn "epilogue_reit_16"
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  [(set (reg:HI SP_REGNO)
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        (plus:HI (reg:HI SP_REGNO)
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              (const_int 4)))
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   (return)
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   ]
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  "TARGET_A16"
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  "reit"
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  [(set_attr "flags" "x")]
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  )
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(define_insn "epilogue_exitd_24"
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  [(set (reg:PSI SP_REGNO)
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        (plus:PSI (reg:PSI FB_REGNO)
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              (const_int 4)))
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   (set (reg:PSI FB_REGNO)
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        (mem:PSI (reg:PSI FB_REGNO)))
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   (return)
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   ]
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  "TARGET_A24"
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  "exitd"
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  [(set_attr "flags" "x")]
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  )
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(define_insn "epilogue_reit_24"
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  [(set (reg:PSI SP_REGNO)
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        (plus:PSI (reg:PSI SP_REGNO)
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              (const_int 6)))
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   (return)
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   ]
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  "TARGET_A24"
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  "reit"
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  [(set_attr "flags" "x")]
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  )
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(define_insn "epilogue_freit"
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  [(unspec [(const_int 0)] UNS_FREIT)
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   (return)
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   ]
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  ""
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  "freit"
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  [(set_attr "flags" "x")]
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  )
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(define_insn "epilogue_rts"
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  [(return)
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   ]
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  ""
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  "rts"
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  [(set_attr "flags" "x")]
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  )
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(define_insn "epilogue_start"
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  [(unspec_volatile [(const_int 0)] UNS_EPILOGUE_START)]
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  ""
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  "; start of epilogue"
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  [(set_attr "flags" "n")]
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  )
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; These are used by the prologue/epilogue code.
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(define_insn "pushm"
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  [(unspec [(match_operand 0 "const_int_operand" "i")] UNS_PUSHM)]
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  ""
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  "pushm\t%p0"
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  [(set_attr "flags" "n")]
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  )
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(define_insn "popm"
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  [(unspec [(match_operand 0 "const_int_operand" "i")] UNS_POPM)]
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  ""
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  "popm\t%p0"
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  [(set_attr "flags" "n")]
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  )
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(define_insn "fset_b"
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  [(unspec [(const_int 0)] UNS_FSETB)]
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  ""
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  "fset\tB"
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  [(set_attr "flags" "n")]
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  )
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