diff options
Diffstat (limited to 'gcc/hard-reg-set.h')
| -rw-r--r-- | gcc/hard-reg-set.h | 267 |
1 files changed, 267 insertions, 0 deletions
diff --git a/gcc/hard-reg-set.h b/gcc/hard-reg-set.h new file mode 100644 index 0000000..1c3342a --- /dev/null +++ b/gcc/hard-reg-set.h @@ -0,0 +1,267 @@ +/* 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. */ + +/* 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 HOST_WIDE_INTs, + and HARD_REG_SET_LONGS is 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 only loses 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 isn't worth making this as complex as it used to be. */ + +#if FIRST_PSEUDO_REGISTER <= HOST_BITS_PER_WIDE_INT +#define HARD_REG_SET HOST_WIDE_INT + +#else + +#define HARD_REG_SET_LONGS \ + ((FIRST_PSEUDO_REGISTER + HOST_BITS_PER_WIDE_INT - 1) \ + / HOST_BITS_PER_WIDE_INT) +typedef HOST_WIDE_INT HARD_REG_SET[HARD_REG_SET_LONGS]; + +#endif + +/* HARD_CONST is used to cast a constant to a HARD_REG_SET + if that is a scalar wider than an integer. */ + +#ifdef HARD_REG_SET +#define HARD_CONST(X) ((HARD_REG_SET) (X)) +#else +#define HARD_CONST(X) (X) +#endif + +/* 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 (-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 (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] \ + |= (HOST_WIDE_INT) 1 << ((BIT) % UHOST_BITS_PER_WIDE_INT)) + +#define CLEAR_HARD_REG_BIT(SET, BIT) \ + ((SET)[(BIT) / UHOST_BITS_PER_WIDE_INT] \ + &= ~((HOST_WIDE_INT) 1 << ((BIT) % UHOST_BITS_PER_WIDE_INT))) + +#define TEST_HARD_REG_BIT(SET, BIT) \ + ((SET)[(BIT) / UHOST_BITS_PER_WIDE_INT] \ + & ((HOST_WIDE_INT) 1 << ((BIT) % UHOST_BITS_PER_WIDE_INT))) + +#define CLEAR_HARD_REG_SET(TO) \ +do { register HOST_WIDE_INT *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 HOST_WIDE_INT *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 HOST_WIDE_INT *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 HOST_WIDE_INT *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 HOST_WIDE_INT *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 HOST_WIDE_INT *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 HOST_WIDE_INT *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 HOST_WIDE_INT *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 HOST_WIDE_INT *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 HOST_WIDE_INT *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]; |