xtensa.h

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/* Identify valid Xtensa addresses.  */
#define GO_IF_LEGITIMATE_ADDRESS(MODE, ADDR, LABEL)			\
  do {									\
    rtx xinsn = (ADDR);							\
									\
    /* allow constant pool addresses */					\
    if ((MODE) != BLKmode && GET_MODE_SIZE (MODE) >= UNITS_PER_WORD	\
	&& !TARGET_CONST16 && constantpool_address_p (xinsn))		\
      goto LABEL;							\
									\
    while (GET_CODE (xinsn) == SUBREG)					\
      xinsn = SUBREG_REG (xinsn);					\
									\
    /* allow base registers */						\
    if (GET_CODE (xinsn) == REG && REG_OK_FOR_BASE_P (xinsn))		\
      goto LABEL;							\
									\
    /* check for "register + offset" addressing */			\
    if (GET_CODE (xinsn) == PLUS)					\
      {									\
	rtx xplus0 = XEXP (xinsn, 0);					\
	rtx xplus1 = XEXP (xinsn, 1);					\
	enum rtx_code code0;						\
	enum rtx_code code1;						\
									\
	while (GET_CODE (xplus0) == SUBREG)				\
	  xplus0 = SUBREG_REG (xplus0);					\
	code0 = GET_CODE (xplus0);					\
									\
	while (GET_CODE (xplus1) == SUBREG)				\
	  xplus1 = SUBREG_REG (xplus1);					\
	code1 = GET_CODE (xplus1);					\
									\
	/* swap operands if necessary so the register is first */	\
	if (code0 != REG && code1 == REG)				\
	  {								\
	    xplus0 = XEXP (xinsn, 1);					\
	    xplus1 = XEXP (xinsn, 0);					\
	    code0 = GET_CODE (xplus0);					\
	    code1 = GET_CODE (xplus1);					\
	  }								\
									\
	if (code0 == REG && REG_OK_FOR_BASE_P (xplus0)			\
	    && code1 == CONST_INT					\
	    && xtensa_mem_offset (INTVAL (xplus1), (MODE)))		\
	  {								\
	    goto LABEL;							\
	  }								\
      }									\
  } while (0)

/* A C expression that is 1 if the RTX X is a constant which is a
   valid address.  This is defined to be the same as 'CONSTANT_P (X)',
   but rejecting CONST_DOUBLE.  */
#define CONSTANT_ADDRESS_P(X)						\
  ((GET_CODE (X) == LABEL_REF || GET_CODE (X) == SYMBOL_REF		\
    || GET_CODE (X) == CONST_INT || GET_CODE (X) == HIGH		\
    || (GET_CODE (X) == CONST)))

/* Nonzero if the constant value X is a legitimate general operand.
   It is given that X satisfies CONSTANT_P or is a CONST_DOUBLE.  */
#define LEGITIMATE_CONSTANT_P(X) 1

/* A C expression that is nonzero if X is a legitimate immediate
   operand on the target machine when generating position independent
   code.  */
#define LEGITIMATE_PIC_OPERAND_P(X)					\
  ((GET_CODE (X) != SYMBOL_REF						\
    || (SYMBOL_REF_LOCAL_P (X) && !SYMBOL_REF_EXTERNAL_P (X)))		\
   && GET_CODE (X) != LABEL_REF						\
   && GET_CODE (X) != CONST)

/* Tell GCC how to use ADDMI to generate addresses.  */
#define LEGITIMIZE_ADDRESS(X, OLDX, MODE, WIN)				\
  do {									\
    rtx xinsn = (X);							\
    if (GET_CODE (xinsn) == PLUS)					\
      { 								\
	rtx plus0 = XEXP (xinsn, 0);					\
	rtx plus1 = XEXP (xinsn, 1);					\
									\
	if (GET_CODE (plus0) != REG && GET_CODE (plus1) == REG)		\
	  {								\
	    plus0 = XEXP (xinsn, 1);					\
	    plus1 = XEXP (xinsn, 0);					\
	  }								\
									\
	if (GET_CODE (plus0) == REG					\
	    && GET_CODE (plus1) == CONST_INT				\
	    && !xtensa_mem_offset (INTVAL (plus1), MODE)		\
	    && !xtensa_simm8 (INTVAL (plus1))				\
	    && xtensa_mem_offset (INTVAL (plus1) & 0xff, MODE)		\
	    && xtensa_simm8x256 (INTVAL (plus1) & ~0xff))		\
	  {								\
	    rtx temp = gen_reg_rtx (Pmode);				\
	    emit_insn (gen_rtx_SET (Pmode, temp,			\
				gen_rtx_PLUS (Pmode, plus0,		\
					 GEN_INT (INTVAL (plus1) & ~0xff)))); \
	    (X) = gen_rtx_PLUS (Pmode, temp,				\
			   GEN_INT (INTVAL (plus1) & 0xff));		\
	    goto WIN;							\
	  }								\
      }									\
  } while (0)


/* Treat constant-pool references as "mode dependent" since they can
   only be accessed with SImode loads.  This works around a bug in the
   combiner where a constant pool reference is temporarily converted
   to an HImode load, which is then assumed to zero-extend based on
   our definition of LOAD_EXTEND_OP.  This is wrong because the high
   bits of a 16-bit value in the constant pool are now sign-extended
   by default.  */

#define GO_IF_MODE_DEPENDENT_ADDRESS(ADDR, LABEL)			\
  do {									\
    if (constantpool_address_p (ADDR))					\
      goto LABEL;							\
  } while (0)

/* Specify the machine mode that this machine uses
   for the index in the tablejump instruction.  */
#define CASE_VECTOR_MODE (SImode)

/* Define this as 1 if 'char' should by default be signed; else as 0.  */
#define DEFAULT_SIGNED_CHAR 0

/* Max number of bytes we can move from memory to memory
   in one reasonably fast instruction.  */
#define MOVE_MAX 4
#define MAX_MOVE_MAX 4

/* Prefer word-sized loads.  */
#define SLOW_BYTE_ACCESS 1

/* Shift instructions ignore all but the low-order few bits.  */
#define SHIFT_COUNT_TRUNCATED 1

/* Value is 1 if truncating an integer of INPREC bits to OUTPREC bits
   is done just by pretending it is already truncated.  */
#define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) 1

/* Specify the machine mode that pointers have.
   After generation of rtl, the compiler makes no further distinction
   between pointers and any other objects of this machine mode.  */
#define Pmode SImode

/* A function address in a call instruction is a word address (for
   indexing purposes) so give the MEM rtx a words's mode.  */
#define FUNCTION_MODE SImode

/* A C expression for the cost of moving data from a register in
   class FROM to one in class TO.  The classes are expressed using
   the enumeration values such as 'GENERAL_REGS'.  A value of 2 is
   the default; other values are interpreted relative to that.  */
#define REGISTER_MOVE_COST(MODE, FROM, TO)				\
  (((FROM) == (TO) && (FROM) != BR_REGS && (TO) != BR_REGS)		\
   ? 2									\
   : (reg_class_subset_p ((FROM), AR_REGS)				\
      && reg_class_subset_p ((TO), AR_REGS)				\
      ? 2								\
      : (reg_class_subset_p ((FROM), AR_REGS)				\
	 && (TO) == ACC_REG						\
	 ? 3								\
	 : ((FROM) == ACC_REG						\
	    && reg_class_subset_p ((TO), AR_REGS)			\
	    ? 3								\
	    : 10))))

#define MEMORY_MOVE_COST(MODE, CLASS, IN) 4

#define BRANCH_COST 3

/* How to refer to registers in assembler output.
   This sequence is indexed by compiler's hard-register-number (see above).  */
#define REGISTER_NAMES							\
{									\
  "a0",   "sp",   "a2",   "a3",   "a4",   "a5",   "a6",   "a7",		\
  "a8",   "a9",   "a10",  "a11",  "a12",  "a13",  "a14",  "a15",	\
  "fp",   "argp", "b0",							\
  "f0",   "f1",   "f2",   "f3",   "f4",   "f5",   "f6",   "f7",		\
  "f8",   "f9",   "f10",  "f11",  "f12",  "f13",  "f14",  "f15",	\
  "acc"									\
}

/* If defined, a C initializer for an array of structures containing a
   name and a register number.  This macro defines additional names
   for hard registers, thus allowing the 'asm' option in declarations
   to refer to registers using alternate names.  */
#define ADDITIONAL_REGISTER_NAMES					\
{									\
  { "a1",	 1 + GP_REG_FIRST }					\
}

#define PRINT_OPERAND(FILE, X, CODE) print_operand (FILE, X, CODE)
#define PRINT_OPERAND_ADDRESS(FILE, ADDR) print_operand_address (FILE, ADDR)

/* Recognize machine-specific patterns that may appear within
   constants.  Used for PIC-specific UNSPECs.  */
#define OUTPUT_ADDR_CONST_EXTRA(STREAM, X, FAIL)			\
  do {									\
    if (flag_pic && GET_CODE (X) == UNSPEC && XVECLEN ((X), 0) == 1)	\
      {									\
	switch (XINT ((X), 1))						\
	  {								\
	  case UNSPEC_PLT:						\
	    output_addr_const ((STREAM), XVECEXP ((X), 0, 0));		\
	    fputs ("@PLT", (STREAM));					\
	    break;							\
	  default:							\
	    goto FAIL;							\
	  }								\
	break;								\
      }									\
    else								\
      goto FAIL;							\
  } while (0)

/* Globalizing directive for a label.  */
#define GLOBAL_ASM_OP "\t.global\t"

/* Declare an uninitialized external linkage data object.  */
#define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
  asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)

/* This is how to output an element of a case-vector that is absolute.  */
#define ASM_OUTPUT_ADDR_VEC_ELT(STREAM, VALUE)				\
  fprintf (STREAM, "%s%sL%u\n", integer_asm_op (4, TRUE),		\
	   LOCAL_LABEL_PREFIX, VALUE)

/* This is how to output an element of a case-vector that is relative.
   This is used for pc-relative code.  */
#define ASM_OUTPUT_ADDR_DIFF_ELT(STREAM, BODY, VALUE, REL)		\
  do {									\
    fprintf (STREAM, "%s%sL%u-%sL%u\n",	integer_asm_op (4, TRUE),	\
	     LOCAL_LABEL_PREFIX, (VALUE),				\
	     LOCAL_LABEL_PREFIX, (REL));				\
  } while (0)

/* This is how to output an assembler line that says to advance the
   location counter to a multiple of 2**LOG bytes.  */
#define ASM_OUTPUT_ALIGN(STREAM, LOG)					\
  do {									\
    if ((LOG) != 0)							\
      fprintf (STREAM, "\t.align\t%d\n", 1 << (LOG));			\
  } while (0)

/* Indicate that jump tables go in the text section.  This is
   necessary when compiling PIC code.  */
#define JUMP_TABLES_IN_TEXT_SECTION (flag_pic)


/* Define the strings to put out for each section in the object file.  */
#define TEXT_SECTION_ASM_OP	"\t.text"
#define DATA_SECTION_ASM_OP	"\t.data"
#define BSS_SECTION_ASM_OP	"\t.section\t.bss"


/* Define output to appear before the constant pool.  If the function
   has been assigned to a specific ELF section, or if it goes into a
   unique section, set the name of that section to be the literal
   prefix.  */
#define ASM_OUTPUT_POOL_PROLOGUE(FILE, FUNNAME, FUNDECL, SIZE)          \
  do {									\
    tree fnsection;							\
    resolve_unique_section ((FUNDECL), 0, flag_function_sections);	\
    fnsection = DECL_SECTION_NAME (FUNDECL);				\
    if (fnsection != NULL_TREE)						\
      {									\
	const char *fnsectname = TREE_STRING_POINTER (fnsection);	\
	fprintf (FILE, "\t.begin\tliteral_prefix %s\n",			\
		 strcmp (fnsectname, ".text") ? fnsectname : "");	\
      }									\
    if ((SIZE) > 0)							\
      {									\
	function_section (FUNDECL);  					\
	fprintf (FILE, "\t.literal_position\n");			\
      }									\
  } while (0)


/* Define code to write out the ".end literal_prefix" directive for a
   function in a special section.  This is appended to the standard ELF
   code for ASM_DECLARE_FUNCTION_SIZE.  */
#define XTENSA_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)			\
  if (DECL_SECTION_NAME (DECL) != NULL_TREE)				\
    fprintf (FILE, "\t.end\tliteral_prefix\n")

/* A C statement (with or without semicolon) to output a constant in
   the constant pool, if it needs special treatment.  */
#define ASM_OUTPUT_SPECIAL_POOL_ENTRY(FILE, X, MODE, ALIGN, LABELNO, JUMPTO) \
  do {									\
    xtensa_output_literal (FILE, X, MODE, LABELNO);			\
    goto JUMPTO;							\
  } while (0)

/* How to start an assembler comment.  */
#define ASM_COMMENT_START "#"

/* Exception handling TODO!! */
#define DWARF_UNWIND_INFO 0

/* Xtensa constant pool breaks the devices in crtstuff.c to control
   section in where code resides.  We have to write it as asm code.  Use
   a MOVI and let the assembler relax it -- for the .init and .fini
   sections, the assembler knows to put the literal in the right
   place.  */
#define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC) \
    asm (SECTION_OP "\n\
	movi\ta8, " USER_LABEL_PREFIX #FUNC "\n\
	callx8\ta8\n" \
	TEXT_SECTION_ASM_OP);