174 lines
6.1 KiB
C
174 lines
6.1 KiB
C
|
/* 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.
|
||
|
|
||
|
HARD_REG_SET is a macro. Its definition is HARD_REG_ELT_TYPE,
|
||
|
and it has enough bits to represent all the THUMB hard registers.
|
||
|
|
||
|
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 HOST_WIDE_UINT HARD_REG_ELT_TYPE;
|
||
|
|
||
|
#define HARD_REG_SET HARD_REG_ELT_TYPE
|
||
|
|
||
|
/* 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.
|
||
|
*/
|
||
|
|
||
|
#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
|
||
|
|
||
|
/* 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;
|
||
|
|
||
|
/* Registers that we don't want to caller save. */
|
||
|
extern HARD_REG_SET losing_caller_save_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];
|
||
|
|
||
|
/* 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];
|
||
|
|
||
|
/* For each pair of reg classes,
|
||
|
the smallest reg class that contains their union. */
|
||
|
|
||
|
extern enum reg_class reg_class_superunion[N_REG_CLASSES][N_REG_CLASSES];
|
||
|
|
||
|
/* Number of non-fixed registers. */
|
||
|
|
||
|
extern int n_non_fixed_regs;
|
||
|
|
||
|
/* Vector indexed by hardware reg giving its name. */
|
||
|
|
||
|
extern char *reg_names[FIRST_PSEUDO_REGISTER];
|