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- /* Sets (bit vectors) of hard registers, and operations on them.
- Copyright (C) 1987, 1992 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, 675 Mass Ave, Cambridge, MA 02139, 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)))
-
- #define CLEAR_HARD_REG_SET(TO) \
- do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO); \
- register int i; \
- for (i = 0; i < HARD_REG_SET_LONGS; i++) \
- *scan_tp_++ = 0; } while (0)
-
- #define SET_HARD_REG_SET(TO) \
- do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO); \
- register int i; \
- for (i = 0; i < HARD_REG_SET_LONGS; i++) \
- *scan_tp_++ = -1; } while (0)
-
- #define COPY_HARD_REG_SET(TO, FROM) \
- do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
- register 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 { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
- register 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 { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
- register 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 { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
- register 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 { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
- register 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 { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
- register 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 { register HARD_REG_ELT_TYPE *scan_xp_ = (X), *scan_yp_ = (Y); \
- register 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 { register HARD_REG_ELT_TYPE *scan_xp_ = (X), *scan_yp_ = (Y); \
- register 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
-
- /* 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. */
-
- #ifdef REG_ALLOC_ORDER /* Avoid undef symbol in certain broken linkers. */
- extern int 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[];
-
- /* 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];
-