freebsd-dev/contrib/gcc/hard-reg-set.h
2003-07-11 03:40:53 +00:00

497 lines
17 KiB
C

/* Sets (bit vectors) of hard registers, and operations on them.
Copyright (C) 1987, 1992, 1994, 2000 Free Software Foundation, Inc.
This file is part of GCC
GCC 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.
GCC 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 GCC; see the file COPYING. If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA. */
#ifndef GCC_HARD_REG_SET_H
#define GCC_HARD_REG_SET_H
/* 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 { HARD_REG_ELT_TYPE *scan_tp_ = (TO); \
scan_tp_[0] = 0; \
scan_tp_[1] = 0; } while (0)
#define SET_HARD_REG_SET(TO) \
do { 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 { 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 { 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 { 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 { 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 { 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 { 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 { 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 { 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 { 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 { 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 { 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 { 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 { 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 { 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 { 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 { 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 { 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) \
do { HARD_REG_ELT_TYPE *scan_xp_ = (X), *scan_yp_ = (Y); \
if ((scan_xp_[0] == scan_yp_[0]) \
&& (scan_xp_[1] == scan_yp_[1]) \
&& (scan_xp_[2] == scan_yp_[2])) \
goto TO; } while (0)
#else
#if FIRST_PSEUDO_REGISTER <= 4*HOST_BITS_PER_WIDE_INT
#define CLEAR_HARD_REG_SET(TO) \
do { HARD_REG_ELT_TYPE *scan_tp_ = (TO); \
scan_tp_[0] = 0; \
scan_tp_[1] = 0; \
scan_tp_[2] = 0; \
scan_tp_[3] = 0; } while (0)
#define SET_HARD_REG_SET(TO) \
do { HARD_REG_ELT_TYPE *scan_tp_ = (TO); \
scan_tp_[0] = -1; \
scan_tp_[1] = -1; \
scan_tp_[2] = -1; \
scan_tp_[3] = -1; } while (0)
#define COPY_HARD_REG_SET(TO, FROM) \
do { 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]; \
scan_tp_[3] = scan_fp_[3]; } while (0)
#define COMPL_HARD_REG_SET(TO, FROM) \
do { 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]; \
scan_tp_[3] = ~ scan_fp_[3]; } while (0)
#define AND_HARD_REG_SET(TO, FROM) \
do { 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]; \
scan_tp_[3] &= scan_fp_[3]; } while (0)
#define AND_COMPL_HARD_REG_SET(TO, FROM) \
do { 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]; \
scan_tp_[3] &= ~ scan_fp_[3]; } while (0)
#define IOR_HARD_REG_SET(TO, FROM) \
do { 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]; \
scan_tp_[3] |= scan_fp_[3]; } while (0)
#define IOR_COMPL_HARD_REG_SET(TO, FROM) \
do { 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]; \
scan_tp_[3] |= ~ scan_fp_[3]; } while (0)
#define GO_IF_HARD_REG_SUBSET(X,Y,TO) \
do { 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])) \
&& (0 == (scan_xp_[3] & ~ scan_yp_[3]))) \
goto TO; } while (0)
#define GO_IF_HARD_REG_EQUAL(X,Y,TO) \
do { HARD_REG_ELT_TYPE *scan_xp_ = (X), *scan_yp_ = (Y); \
if ((scan_xp_[0] == scan_yp_[0]) \
&& (scan_xp_[1] == scan_yp_[1]) \
&& (scan_xp_[2] == scan_yp_[2]) \
&& (scan_xp_[3] == scan_yp_[3])) \
goto TO; } while (0)
#else /* FIRST_PSEUDO_REGISTER > 3*HOST_BITS_PER_WIDE_INT */
#define CLEAR_HARD_REG_SET(TO) \
do { HARD_REG_ELT_TYPE *scan_tp_ = (TO); \
int i; \
for (i = 0; i < HARD_REG_SET_LONGS; i++) \
*scan_tp_++ = 0; } while (0)
#define SET_HARD_REG_SET(TO) \
do { HARD_REG_ELT_TYPE *scan_tp_ = (TO); \
int i; \
for (i = 0; i < HARD_REG_SET_LONGS; i++) \
*scan_tp_++ = -1; } while (0)
#define COPY_HARD_REG_SET(TO, FROM) \
do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
int i; \
for (i = 0; i < HARD_REG_SET_LONGS; i++) \
*scan_tp_++ = *scan_fp_++; } while (0)
#define COMPL_HARD_REG_SET(TO, FROM) \
do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
int i; \
for (i = 0; i < HARD_REG_SET_LONGS; i++) \
*scan_tp_++ = ~ *scan_fp_++; } while (0)
#define AND_HARD_REG_SET(TO, FROM) \
do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
int i; \
for (i = 0; i < HARD_REG_SET_LONGS; i++) \
*scan_tp_++ &= *scan_fp_++; } while (0)
#define AND_COMPL_HARD_REG_SET(TO, FROM) \
do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
int i; \
for (i = 0; i < HARD_REG_SET_LONGS; i++) \
*scan_tp_++ &= ~ *scan_fp_++; } while (0)
#define IOR_HARD_REG_SET(TO, FROM) \
do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
int i; \
for (i = 0; i < HARD_REG_SET_LONGS; i++) \
*scan_tp_++ |= *scan_fp_++; } while (0)
#define IOR_COMPL_HARD_REG_SET(TO, FROM) \
do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
int i; \
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 { HARD_REG_ELT_TYPE *scan_xp_ = (X), *scan_yp_ = (Y); \
int i; \
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 GO_IF_HARD_REG_EQUAL(X,Y,TO) \
do { HARD_REG_ELT_TYPE *scan_xp_ = (X), *scan_yp_ = (Y); \
int i; \
for (i = 0; i < HARD_REG_SET_LONGS; i++) \
if (*scan_xp_++ != *scan_yp_++) break; \
if (i == HARD_REG_SET_LONGS) goto TO; } while (0)
#endif
#endif
#endif
#endif
/* 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];
#ifdef CALL_REALLY_USED_REGISTERS
extern char call_really_used_regs[];
#endif
/* 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];
/* Contains 1 for registers that are set or clobbered by calls. */
/* ??? Ideally, this would be just call_used_regs plus global_regs, but
for someone's bright idea to have call_used_regs strictly include
fixed_regs. Which leaves us guessing as to the set of fixed_regs
that are actually preserved. We know for sure that those associated
with the local stack frame are safe, but scant others. */
extern HARD_REG_SET regs_invalidated_by_call;
#ifdef REG_ALLOC_ORDER
/* Table of register numbers in the order in which to try to use them. */
extern int reg_alloc_order[FIRST_PSEUDO_REGISTER];
/* The inverse of reg_alloc_order. */
extern int inv_reg_alloc_order[FIRST_PSEUDO_REGISTER];
#endif
/* For each reg class, a HARD_REG_SET saying which registers are in it. */
extern HARD_REG_SET reg_class_contents[N_REG_CLASSES];
/* For each reg class, number of regs it contains. */
extern unsigned 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 const char * reg_names[FIRST_PSEUDO_REGISTER];
/* Given a hard REGN a FROM mode and a TO mode, return nonzero if
REGN cannot change modes between the specified modes. */
#define REG_CANNOT_CHANGE_MODE_P(REGN, FROM, TO) \
CANNOT_CHANGE_MODE_CLASS (FROM, TO, REGNO_REG_CLASS (REGN))
#endif /* ! GCC_HARD_REG_SET_H */