/* Sets (bit vectors) of hard registers, and operations on them.
Copyright (C) 1987 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 1, or (at your option)
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, 675 Mass Ave, Cambridge, MA 02139, USA. */
/* Define the type of a set of hard registers. */
/* If HARD_REG_SET is a macro, its definition is a scalar type
that has enough bits for all the target machine's hard registers.
Otherwise, it is a typedef for a suitable array of longs,
and HARD_REG_SET_LONGS is how many. */
#if FIRST_PSEUDO_REGISTER <= HOST_BITS_PER_CHAR
#define HARD_REG_SET char
#if FIRST_PSEUDO_REGISTER <= HOST_BITS_PER_SHORT
#define HARD_REG_SET short
#if FIRST_PSEUDO_REGISTER <= HOST_BITS_PER_INT
#if FIRST_PSEUDO_REGISTER <= HOST_BITS_PER_LONG
#define HARD_REG_SET long
#define HARD_REG_SET_LONGS \
((FIRST_PSEUDO_REGISTER + HOST_BITS_PER_LONG - 1) / HOST_BITS_PER_LONG)
typedef long HARD_REG_SET
[HARD_REG_SET_LONGS
];
/* 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.
#define SET_HARD_REG_BIT(SET, BIT) \
#define CLEAR_HARD_REG_BIT(SET, BIT) \
#define TEST_HARD_REG_BIT(SET, BIT) \
#define CLEAR_HARD_REG_SET(TO) ((TO) = 0)
#define SET_HARD_REG_SET(TO) ((TO) = -1)
#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 (0 == ((X) & ~(Y))) goto TO
#define SET_HARD_REG_BIT(SET, BIT) \
((SET)[(BIT) / HOST_BITS_PER_LONG] |= 1 << ((BIT) % HOST_BITS_PER_LONG))
#define CLEAR_HARD_REG_BIT(SET, BIT) \
((SET)[(BIT) / HOST_BITS_PER_LONG] &= ~(1 << ((BIT) % HOST_BITS_PER_LONG)))
#define TEST_HARD_REG_BIT(SET, BIT) \
((SET)[(BIT) / HOST_BITS_PER_LONG] & (1 << ((BIT) % HOST_BITS_PER_LONG)))
#define CLEAR_HARD_REG_SET(TO) \
do { register long *scan_tp_ = (TO); \
for (i = 0; i < HARD_REG_SET_LONGS; i++) \
*scan_tp_++ = 0; } while (0)
#define SET_HARD_REG_SET(TO) \
do { register long *scan_tp_ = (TO); \
for (i = 0; i < HARD_REG_SET_LONGS; i++) \
*scan_tp_++ = -1; } while (0)
#define COPY_HARD_REG_SET(TO, FROM) \
do { register long *scan_tp_ = (TO), *scan_fp_ = (FROM); \
for (i = 0; i < HARD_REG_SET_LONGS; i++) \
*scan_tp_++ = *scan_fp_++; } while (0)
#define COMPL_HARD_REG_SET(TO, FROM) \
do { register long *scan_tp_ = (TO), *scan_fp_ = (FROM); \
for (i = 0; i < HARD_REG_SET_LONGS; i++) \
*scan_tp_++ = ~ *scan_fp_++; } while (0)
#define AND_HARD_REG_SET(TO, FROM) \
do { register long *scan_tp_ = (TO), *scan_fp_ = (FROM); \
for (i = 0; i < HARD_REG_SET_LONGS; i++) \
*scan_tp_++ &= *scan_fp_++; } while (0)
#define AND_COMPL_HARD_REG_SET(TO, FROM) \
do { register long *scan_tp_ = (TO), *scan_fp_ = (FROM); \
for (i = 0; i < HARD_REG_SET_LONGS; i++) \
*scan_tp_++ &= ~ *scan_fp_++; } while (0)
#define IOR_HARD_REG_SET(TO, FROM) \
do { register long *scan_tp_ = (TO), *scan_fp_ = (FROM); \
for (i = 0; i < HARD_REG_SET_LONGS; i++) \
*scan_tp_++ |= *scan_fp_++; } while (0)
#define IOR_COMPL_HARD_REG_SET(TO, FROM) \
do { register long *scan_tp_ = (TO), *scan_fp_ = (FROM); \
for (i = 0; i < HARD_REG_SET_LONGS; i++) \
*scan_tp_++ |= ~ *scan_fp_++; } while (0)
#define GO_IF_HARD_REG_SUBSET(X,Y,TO) \
do { register long *scan_xp_ = (X), *scan_yp_ = (Y); \
for (i = 0; i < HARD_REG_SET_LONGS; i++) \
if (0 != (*scan_xp_++ & ~*scan_yp_++)) break; \
if (i == HARD_REG_SET_LONGS) goto TO; } while (0)
/* Define some standard sets of registers. */
/* Indexed by hard register number, contains 1 for registers
that are fixed use (stack pointer, pc, frame pointer, etc.).
These are the registers that cannot be used to allocate
a pseudo reg whose life does not cross calls. */
extern char fixed_regs
[FIRST_PSEUDO_REGISTER
];
/* The same info as a HARD_REG_SET. */
extern HARD_REG_SET fixed_reg_set
;
/* Indexed by hard register number, contains 1 for registers
that are fixed use or are clobbered by function calls.
These are the registers that cannot be used to allocate
a pseudo reg whose life crosses calls. */
extern char call_used_regs
[FIRST_PSEUDO_REGISTER
];
/* The same info as a HARD_REG_SET. */
extern HARD_REG_SET call_used_reg_set
;
/* Indexed by hard register number, contains 1 for registers that are
fixed use -- i.e. in fixed_regs -- or a function value return register
or STRUCT_VALUE_REGNUM or STATIC_CHAIN_REGNUM. These are the
registers that cannot hold quantities across calls even if we are
willing to save and restore them. */
extern char call_fixed_regs
[FIRST_PSEUDO_REGISTER
];
/* The same info as a HARD_REG_SET. */
extern HARD_REG_SET call_fixed_reg_set
;
/* Indexed by hard register number, contains 1 for registers
that are being used for global register decls.
These must be exempt from ordinary flow analysis
and are also considered fixed. */
extern char global_regs
[FIRST_PSEUDO_REGISTER
];
/* Table of register numbers in the order in which to try to use them. */
extern int reg_alloc_order
[FIRST_PSEUDO_REGISTER
];
/* For each reg class, a HARD_REG_SET saying which registers are in it. */
extern HARD_REG_SET reg_class_contents
[];
/* For each reg class, number of regs it contains. */
extern int reg_class_size
[N_REG_CLASSES
];
/* For each reg class, table listing all the containing classes. */
extern enum reg_class reg_class_superclasses
[N_REG_CLASSES
][N_REG_CLASSES
];
/* For each reg class, table listing all the classes contained in it. */
extern enum reg_class reg_class_subclasses
[N_REG_CLASSES
][N_REG_CLASSES
];
/* For each pair of reg classes,
a largest reg class contained in their union. */
extern enum reg_class reg_class_subunion
[N_REG_CLASSES
][N_REG_CLASSES
];
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