stormy16.h

linux下的gcc编译器

   address of other frames.  */
#define RETURN_ADDR_RTX(COUNT, FRAMEADDR)	\
  ((COUNT) == 0					\
   ? gen_rtx_MEM (Pmode, arg_pointer_rtx)	\
   : NULL_RTX)

/* Define this if the return address of a particular stack frame is
   accessed from the frame pointer of the previous stack frame.  */
/* #define RETURN_ADDR_IN_PREVIOUS_FRAME */

/* A C expression whose value is RTL representing the location of the incoming
   return address at the beginning of any function, before the prologue.  This
   RTL is either a `REG', indicating that the return value is saved in `REG',
   or a `MEM' representing a location in the stack.

   You only need to define this macro if you want to support call frame
   debugging information like that provided by DWARF 2.  */
#define INCOMING_RETURN_ADDR_RTX  \
   gen_rtx_MEM (SImode, gen_rtx_PLUS (Pmode, stack_pointer_rtx, GEN_INT (-4)))

/* A C expression whose value is an integer giving the offset, in bytes, from
   the value of the stack pointer register to the top of the stack frame at the
   beginning of any function, before the prologue.  The top of the frame is
   defined to be the value of the stack pointer in the previous frame, just
   before the call instruction.

   You only need to define this macro if you want to support call frame
   debugging information like that provided by DWARF 2.  */
#define INCOMING_FRAME_SP_OFFSET (xstormy16_interrupt_function_p () ? 6 : 4)


/* Stack Checking.  */

/* A nonzero value if stack checking is done by the configuration files in a
   machine-dependent manner.  You should define this macro if stack checking is
   require by the ABI of your machine or if you would like to have to stack
   checking in some more efficient way than GNU CC's portable approach.  The
   default value of this macro is zero.  */
/* #define STACK_CHECK_BUILTIN */

/* An integer representing the interval at which GNU CC must generate stack
   probe instructions.  You will normally define this macro to be no larger
   than the size of the "guard pages" at the end of a stack area.  The default
   value of 4096 is suitable for most systems.  */
/* #define STACK_CHECK_PROBE_INTERVAL */

/* A integer which is nonzero if GNU CC should perform the stack probe as a
   load instruction and zero if GNU CC should use a store instruction.  The
   default is zero, which is the most efficient choice on most systems.  */
/* #define STACK_CHECK_PROBE_LOAD */

/* The number of bytes of stack needed to recover from a stack overflow, for
   languages where such a recovery is supported.  The default value of 75 words
   should be adequate for most machines.  */
/* #define STACK_CHECK_PROTECT */

/* The maximum size of a stack frame, in bytes.  GNU CC will generate probe
   instructions in non-leaf functions to ensure at least this many bytes of
   stack are available.  If a stack frame is larger than this size, stack
   checking will not be reliable and GNU CC will issue a warning.  The default
   is chosen so that GNU CC only generates one instruction on most systems.
   You should normally not change the default value of this macro.  */
/* #define STACK_CHECK_MAX_FRAME_SIZE */

/* GNU CC uses this value to generate the above warning message.  It represents
   the amount of fixed frame used by a function, not including space for any
   callee-saved registers, temporaries and user variables.  You need only
   specify an upper bound for this amount and will normally use the default of
   four words.  */
/* #define STACK_CHECK_FIXED_FRAME_SIZE */

/* The maximum size, in bytes, of an object that GNU CC will place in the fixed
   area of the stack frame when the user specifies `-fstack-check'.  GNU CC
   computed the default from the values of the above macros and you will
   normally not need to override that default.  */
/* #define STACK_CHECK_MAX_VAR_SIZE */


/* Register That Address the Stack Frame.  */

/* The register number of the stack pointer register, which must also be a
   fixed register according to `FIXED_REGISTERS'.  On most machines, the
   hardware determines which register this is.  */
#define STACK_POINTER_REGNUM 15

/* The register number of the frame pointer register, which is used to access
   automatic variables in the stack frame.  On some machines, the hardware
   determines which register this is.  On other machines, you can choose any
   register you wish for this purpose.  */
#define FRAME_POINTER_REGNUM 17

/* On some machines the offset between the frame pointer and starting offset of
   the automatic variables is not known until after register allocation has
   been done (for example, because the saved registers are between these two
   locations).  On those machines, define `FRAME_POINTER_REGNUM' the number of
   a special, fixed register to be used internally until the offset is known,
   and define `HARD_FRAME_POINTER_REGNUM' to be actual the hard register number
   used for the frame pointer.

   You should define this macro only in the very rare circumstances when it is
   not possible to calculate the offset between the frame pointer and the
   automatic variables until after register allocation has been completed.
   When this macro is defined, you must also indicate in your definition of
   `ELIMINABLE_REGS' how to eliminate `FRAME_POINTER_REGNUM' into either
   `HARD_FRAME_POINTER_REGNUM' or `STACK_POINTER_REGNUM'.

   Do not define this macro if it would be the same as `FRAME_POINTER_REGNUM'.  */
#define HARD_FRAME_POINTER_REGNUM 13

/* The register number of the arg pointer register, which is used to access the
   function's argument list.  On some machines, this is the same as the frame
   pointer register.  On some machines, the hardware determines which register
   this is.  On other machines, you can choose any register you wish for this
   purpose.  If this is not the same register as the frame pointer register,
   then you must mark it as a fixed register according to `FIXED_REGISTERS', or
   arrange to be able to eliminate it.  */
#define ARG_POINTER_REGNUM 18

/* The register number of the return address pointer register, which is used to
   access the current function's return address from the stack.  On some
   machines, the return address is not at a fixed offset from the frame pointer
   or stack pointer or argument pointer.  This register can be defined to point
   to the return address on the stack, and then be converted by
   `ELIMINABLE_REGS' into either the frame pointer or stack pointer.

   Do not define this macro unless there is no other way to get the return
   address from the stack.  */
/* #define RETURN_ADDRESS_POINTER_REGNUM */

/* Register numbers used for passing a function's static chain pointer.  If
   register windows are used, the register number as seen by the called
   function is `STATIC_CHAIN_INCOMING_REGNUM', while the register number as
   seen by the calling function is `STATIC_CHAIN_REGNUM'.  If these registers
   are the same, `STATIC_CHAIN_INCOMING_REGNUM' need not be defined.

   The static chain register need not be a fixed register.

   If the static chain is passed in memory, these macros should not be defined;
   instead, the next two macros should be defined.  */
#define STATIC_CHAIN_REGNUM 1
/* #define STATIC_CHAIN_INCOMING_REGNUM */

/* If the static chain is passed in memory, these macros provide rtx giving
   `mem' expressions that denote where they are stored.  `STATIC_CHAIN' and
   `STATIC_CHAIN_INCOMING' give the locations as seen by the calling and called
   functions, respectively.  Often the former will be at an offset from the
   stack pointer and the latter at an offset from the frame pointer.

   The variables `stack_pointer_rtx', `frame_pointer_rtx', and
   `arg_pointer_rtx' will have been initialized prior to the use of these
   macros and should be used to refer to those items.

   If the static chain is passed in a register, the two previous
   macros should be defined instead.  */
/* #define STATIC_CHAIN */
/* #define STATIC_CHAIN_INCOMING */


/* Eliminating the Frame Pointer and the Arg Pointer */

/* A C expression which is nonzero if a function must have and use a frame
   pointer.  This expression is evaluated in the reload pass.  If its value is
   nonzero the function will have a frame pointer.

   The expression can in principle examine the current function and decide
   according to the facts, but on most machines the constant 0 or the constant
   1 suffices.  Use 0 when the machine allows code to be generated with no
   frame pointer, and doing so saves some time or space.  Use 1 when there is
   no possible advantage to avoiding a frame pointer.

   In certain cases, the compiler does not know how to produce valid code
   without a frame pointer.  The compiler recognizes those cases and
   automatically gives the function a frame pointer regardless of what
   `FRAME_POINTER_REQUIRED' says.  You don't need to worry about them.

   In a function that does not require a frame pointer, the frame pointer
   register can be allocated for ordinary usage, unless you mark it as a fixed
   register.  See `FIXED_REGISTERS' for more information.  */
#define FRAME_POINTER_REQUIRED 0

/* A C statement to store in the variable DEPTH_VAR the difference between the
   frame pointer and the stack pointer values immediately after the function
   prologue.  The value would be computed from information such as the result
   of `get_frame_size ()' and the tables of registers `regs_ever_live' and
   `call_used_regs'.

   If `ELIMINABLE_REGS' is defined, this macro will be not be used and need not
   be defined.  Otherwise, it must be defined even if `FRAME_POINTER_REQUIRED'
   is defined to always be true; in that case, you may set DEPTH_VAR to
   anything.  */
/* #define INITIAL_FRAME_POINTER_OFFSET(DEPTH_VAR) */

/* If defined, this macro specifies a table of register pairs used to eliminate
   unneeded registers that point into the stack frame.  If it is not defined,
   the only elimination attempted by the compiler is to replace references to
   the frame pointer with references to the stack pointer.

   The definition of this macro is a list of structure initializations, each of
   which specifies an original and replacement register.
*/

#define ELIMINABLE_REGS					\
{							\
  {FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM},		\
  {FRAME_POINTER_REGNUM, HARD_FRAME_POINTER_REGNUM},	\
  {ARG_POINTER_REGNUM,	 STACK_POINTER_REGNUM},		\
  {ARG_POINTER_REGNUM,	 HARD_FRAME_POINTER_REGNUM},	\
}

/* A C expression that returns nonzero if the compiler is allowed to try to
   replace register number FROM with register number TO.  This macro need only
   be defined if `ELIMINABLE_REGS' is defined, and will usually be the constant
   1, since most of the cases preventing register elimination are things that
   the compiler already knows about.  */

#define CAN_ELIMINATE(FROM, TO)						\
 ((FROM) == ARG_POINTER_REGNUM && (TO) == STACK_POINTER_REGNUM		\
  ? ! frame_pointer_needed						\
  : 1)

/* This macro is similar to `INITIAL_FRAME_POINTER_OFFSET'.  It specifies the
   initial difference between the specified pair of registers.  This macro must
   be defined if `ELIMINABLE_REGS' is defined.  */
#define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
  (OFFSET) = xstormy16_initial_elimination_offset (FROM, TO)


/* Passing Function Arguments on the Stack */

/* Define this macro if an argument declared in a prototype as an integral type
   smaller than `int' should actually be passed as an `int'.  In addition to
   avoiding errors in certain cases of mismatch, it also makes for better code
   on certain machines.  */
#define PROMOTE_PROTOTYPES 1

/* A C expression that is the number of bytes actually pushed onto the stack
   when an instruction attempts to push NPUSHED bytes.

   If the target machine does not have a push instruction, do not define this
   macro.  That directs GNU CC to use an alternate strategy: to allocate the
   entire argument block and then store the arguments into it.

   On some machines, the definition

        #define PUSH_ROUNDING(BYTES) (BYTES)

   will suffice.  But on other machines, instructions that appear to push one
   byte actually push two bytes in an attempt to maintain alignment.  Then the
   definition should be

        #define PUSH_ROUNDING(BYTES) (((BYTES) + 1) & ~1)  */
#define PUSH_ROUNDING(BYTES) (((BYTES) + 1) & ~1)

/* If defined, the maximum amount of space required for outgoing arguments will
   be computed and placed into the variable
   `current_function_outgoing_args_size'.  No space will be pushed onto the
   stack for each call; instead, the function prologue should increase the
   stack frame size by this amount.

   Defining both `PUSH_ROUNDING' and `ACCUMULATE_OUTGOING_ARGS' is not
   proper.  */
/* #define ACCUMULATE_OUTGOING_ARGS */

/* Define this macro if functions should assume that stack space has been
   allocated for arguments even when their values are passed in registers.

   The value of this macro is the size, in bytes, of the area reserved for
   arguments passed in registers for the function represented by FNDECL.

   This space can be allocated by the caller, or be a part of the
   machine-dependent stack frame: `OUTGOING_REG_PARM_STACK_SPACE' says
   which.  */
/* #define REG_PARM_STACK_SPACE(FNDECL) */

/* Define these macros in addition to the one above if functions might allocate
   stack space for arguments even when their values are passed in registers.
   These should be used when the stack space allocated for arguments in
   registers is not a simple constant independent of the function declaration.

   The value of the first macro is the size, in bytes, of the area that we
   should initially assume would be reserved for arguments passed in registers.

   The value of the second macro is the actual size, in bytes, of the area that
   will be reserved for arguments passed in registers.  This takes two