hard-reg-set.h

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/* Sets (bit vectors) of hard registers, and operations on them.
   Copyright (C) 1987, 1992, 1994 Free Software Foundation, Inc.

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.  */


/* Define the type of a set of hard registers.  */

/* HARD_REG_ELT_TYPE is a typedef of the unsigned integral type which
   will be used for hard reg sets, either alone or in an array.

   If HARD_REG_SET is a macro, its definition is HARD_REG_ELT_TYPE,
   and it has enough bits to represent all the target machine's hard
   registers.  Otherwise, it is a typedef for a suitably sized array
   of HARD_REG_ELT_TYPEs.  HARD_REG_SET_LONGS is defined as how many.

   Note that lots of code assumes that the first part of a regset is
   the same format as a HARD_REG_SET.  To help make sure this is true,
   we only try the widest integer mode (HOST_WIDE_INT) instead of all the
   smaller types.  This approach loses only if there are a very few
   registers and then only in the few cases where we have an array of
   HARD_REG_SETs, so it needn't be as complex as it used to be.  */

typedef unsigned HOST_WIDE_INT HARD_REG_ELT_TYPE;

#if FIRST_PSEUDO_REGISTER <= HOST_BITS_PER_WIDE_INT

#define HARD_REG_SET HARD_REG_ELT_TYPE

#else

#define HARD_REG_SET_LONGS \
 ((FIRST_PSEUDO_REGISTER + HOST_BITS_PER_WIDE_INT - 1)	\
  / HOST_BITS_PER_WIDE_INT)
typedef HARD_REG_ELT_TYPE HARD_REG_SET[HARD_REG_SET_LONGS];

#endif

/* HARD_CONST is used to cast a constant to the appropriate type
   for use with a HARD_REG_SET.  */

#define HARD_CONST(X) ((HARD_REG_ELT_TYPE) (X))

/* Define macros SET_HARD_REG_BIT, CLEAR_HARD_REG_BIT and TEST_HARD_REG_BIT
   to set, clear or test one bit in a hard reg set of type HARD_REG_SET.
   All three take two arguments: the set and the register number.

   In the case where sets are arrays of longs, the first argument
   is actually a pointer to a long.

   Define two macros for initializing a set:
   CLEAR_HARD_REG_SET and SET_HARD_REG_SET.
   These take just one argument.

   Also define macros for copying hard reg sets:
   COPY_HARD_REG_SET and COMPL_HARD_REG_SET.
   These take two arguments TO and FROM; they read from FROM
   and store into TO.  COMPL_HARD_REG_SET complements each bit.

   Also define macros for combining hard reg sets:
   IOR_HARD_REG_SET and AND_HARD_REG_SET.
   These take two arguments TO and FROM; they read from FROM
   and combine bitwise into TO.  Define also two variants
   IOR_COMPL_HARD_REG_SET and AND_COMPL_HARD_REG_SET
   which use the complement of the set FROM.

   Also define GO_IF_HARD_REG_SUBSET (X, Y, TO):
   if X is a subset of Y, go to TO.
*/

#ifdef HARD_REG_SET

#define SET_HARD_REG_BIT(SET, BIT)  \
 ((SET) |= HARD_CONST (1) << (BIT))
#define CLEAR_HARD_REG_BIT(SET, BIT)  \
 ((SET) &= ~(HARD_CONST (1) << (BIT)))
#define TEST_HARD_REG_BIT(SET, BIT)  \
 ((SET) & (HARD_CONST (1) << (BIT)))

#define CLEAR_HARD_REG_SET(TO) ((TO) = HARD_CONST (0))
#define SET_HARD_REG_SET(TO) ((TO) = ~ HARD_CONST (0))

#define COPY_HARD_REG_SET(TO, FROM) ((TO) = (FROM))
#define COMPL_HARD_REG_SET(TO, FROM) ((TO) = ~(FROM))

#define IOR_HARD_REG_SET(TO, FROM) ((TO) |= (FROM))
#define IOR_COMPL_HARD_REG_SET(TO, FROM) ((TO) |= ~ (FROM))
#define AND_HARD_REG_SET(TO, FROM) ((TO) &= (FROM))
#define AND_COMPL_HARD_REG_SET(TO, FROM) ((TO) &= ~ (FROM))

#define GO_IF_HARD_REG_SUBSET(X,Y,TO) if (HARD_CONST (0) == ((X) & ~(Y))) goto TO

#define GO_IF_HARD_REG_EQUAL(X,Y,TO) if ((X) == (Y)) goto TO

#else

#define UHOST_BITS_PER_WIDE_INT ((unsigned) HOST_BITS_PER_WIDE_INT)

#define SET_HARD_REG_BIT(SET, BIT)		\
  ((SET)[(BIT) / UHOST_BITS_PER_WIDE_INT]	\
   |= HARD_CONST (1) << ((BIT) % UHOST_BITS_PER_WIDE_INT))

#define CLEAR_HARD_REG_BIT(SET, BIT)		\
  ((SET)[(BIT) / UHOST_BITS_PER_WIDE_INT]	\
   &= ~(HARD_CONST (1) << ((BIT) % UHOST_BITS_PER_WIDE_INT)))

#define TEST_HARD_REG_BIT(SET, BIT)		\
  ((SET)[(BIT) / UHOST_BITS_PER_WIDE_INT]	\
   & (HARD_CONST (1) << ((BIT) % UHOST_BITS_PER_WIDE_INT)))

#if FIRST_PSEUDO_REGISTER <= 2*HOST_BITS_PER_WIDE_INT
#define CLEAR_HARD_REG_SET(TO)  \
do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO);		\
     scan_tp_[0] = 0;						\
     scan_tp_[1] = 0; } while (0)

#define SET_HARD_REG_SET(TO)  \
do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO);		\
     scan_tp_[0] = -1;						\
     scan_tp_[1] = -1; } while (0)

#define COPY_HARD_REG_SET(TO, FROM)  \
do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM);	\
     scan_tp_[0] = scan_fp_[0];					\
     scan_tp_[1] = scan_fp_[1]; } while (0)

#define COMPL_HARD_REG_SET(TO, FROM)  \
do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
     scan_tp_[0] = ~ scan_fp_[0];				\
     scan_tp_[1] = ~ scan_fp_[1]; } while (0)

#define AND_HARD_REG_SET(TO, FROM)  \
do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
     scan_tp_[0] &= scan_fp_[0];					\
     scan_tp_[1] &= scan_fp_[1]; } while (0)

#define AND_COMPL_HARD_REG_SET(TO, FROM)  \
do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
     scan_tp_[0] &= ~ scan_fp_[0];				\
     scan_tp_[1] &= ~ scan_fp_[1]; } while (0)

#define IOR_HARD_REG_SET(TO, FROM)  \
do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
     scan_tp_[0] |= scan_fp_[0];				\
     scan_tp_[1] |= scan_fp_[1]; } while (0)

#define IOR_COMPL_HARD_REG_SET(TO, FROM)  \
do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
     scan_tp_[0] |= ~ scan_fp_[0];				\
     scan_tp_[1] |= ~ scan_fp_[1]; } while (0)

#define GO_IF_HARD_REG_SUBSET(X,Y,TO)  \
do { register HARD_REG_ELT_TYPE *scan_xp_ = (X), *scan_yp_ = (Y); \
     if ((0 == (scan_xp_[0] & ~ scan_yp_[0]))			\
	 && (0 == (scan_xp_[1] & ~ scan_yp_[1])))		\
	goto TO; } while (0)

#define GO_IF_HARD_REG_EQUAL(X,Y,TO)  \
do { register HARD_REG_ELT_TYPE *scan_xp_ = (X), *scan_yp_ = (Y); \
     if ((scan_xp_[0] == scan_yp_[0])				\
	 && (scan_xp_[1] == scan_yp_[1]))			\
	goto TO; } while (0)

#else
#if FIRST_PSEUDO_REGISTER <= 3*HOST_BITS_PER_WIDE_INT
#define CLEAR_HARD_REG_SET(TO)  \
do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO);		\
     scan_tp_[0] = 0;						\
     scan_tp_[1] = 0;						\
     scan_tp_[2] = 0; } while (0)

#define SET_HARD_REG_SET(TO)  \
do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO);		\
     scan_tp_[0] = -1;						\
     scan_tp_[1] = -1;						\
     scan_tp_[2] = -1; } while (0)

#define COPY_HARD_REG_SET(TO, FROM)  \
do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM);	\
     scan_tp_[0] = scan_fp_[0];					\
     scan_tp_[1] = scan_fp_[1];					\
     scan_tp_[2] = scan_fp_[2]; } while (0)

#define COMPL_HARD_REG_SET(TO, FROM)  \
do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
     scan_tp_[0] = ~ scan_fp_[0];				\
     scan_tp_[1] = ~ scan_fp_[1];				\
     scan_tp_[2] = ~ scan_fp_[2]; } while (0)

#define AND_HARD_REG_SET(TO, FROM)  \
do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
     scan_tp_[0] &= scan_fp_[0];					\
     scan_tp_[1] &= scan_fp_[1];					\
     scan_tp_[2] &= scan_fp_[2]; } while (0)

#define AND_COMPL_HARD_REG_SET(TO, FROM)  \
do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
     scan_tp_[0] &= ~ scan_fp_[0];				\
     scan_tp_[1] &= ~ scan_fp_[1];				\
     scan_tp_[2] &= ~ scan_fp_[2]; } while (0)

#define IOR_HARD_REG_SET(TO, FROM)  \
do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
     scan_tp_[0] |= scan_fp_[0];				\
     scan_tp_[1] |= scan_fp_[1];				\
     scan_tp_[2] |= scan_fp_[2]; } while (0)

#define IOR_COMPL_HARD_REG_SET(TO, FROM)  \
do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
     scan_tp_[0] |= ~ scan_fp_[0];				\
     scan_tp_[1] |= ~ scan_fp_[1];				\
     scan_tp_[2] |= ~ scan_fp_[2]; } while (0)

#define GO_IF_HARD_REG_SUBSET(X,Y,TO)  \
do { register HARD_REG_ELT_TYPE *scan_xp_ = (X), *scan_yp_ = (Y); \
     if ((0 == (scan_xp_[0] & ~ scan_yp_[0]))			\
	 && (0 == (scan_xp_[1] & ~ scan_yp_[1]))		\
	 && (0 == (scan_xp_[2] & ~ scan_yp_[2])))		\
	goto TO; } while (0)

#define GO_IF_HARD_REG_EQUAL(X,Y,TO)  \