/* Sets (bit vectors) of hard registers, and operations on them.
- Copyright (C) 1987, 1992, 1994, 2000, 2003, 2004, 2005
- Free Software Foundation, Inc.
+ Copyright (C) 1987, 1992, 1994, 2000, 2003, 2004, 2005, 2007, 2008, 2009,
+ 2010, 2012 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
+Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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, 51 Franklin Street, Fifth Floor, Boston, MA
-02110-1301, USA. */
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
#ifndef GCC_HARD_REG_SET_H
-#define GCC_HARD_REG_SET_H
+#define GCC_HARD_REG_SET_H
/* Define the type of a set of hard registers. */
#endif
+/* HARD_REG_SET wrapped into a structure, to make it possible to
+ use HARD_REG_SET even in APIs that should not include
+ hard-reg-set.h. */
+struct hard_reg_set_container
+{
+ HARD_REG_SET set;
+};
+
/* HARD_CONST is used to cast a constant to the appropriate type
for use with a HARD_REG_SET. */
hard_reg_set_intersect_p (X, Y), which returns true if X and Y intersect.
hard_reg_set_empty_p (X), which returns true if X is empty. */
+#define UHOST_BITS_PER_WIDE_INT ((unsigned) HOST_BITS_PER_WIDEST_FAST_INT)
+
#ifdef HARD_REG_SET
#define SET_HARD_REG_BIT(SET, BIT) \
#else
-#define UHOST_BITS_PER_WIDE_INT ((unsigned) HOST_BITS_PER_WIDEST_FAST_INT)
-
#define SET_HARD_REG_BIT(SET, BIT) \
((SET)[(BIT) / UHOST_BITS_PER_WIDE_INT] \
|= HARD_CONST (1) << ((BIT) % UHOST_BITS_PER_WIDE_INT))
return x[0] == 0 && x[1] == 0 && x[2] == 0 && x[3] == 0;
}
-#else /* FIRST_PSEUDO_REGISTER > 3*HOST_BITS_PER_WIDEST_FAST_INT */
+#else /* FIRST_PSEUDO_REGISTER > 4*HOST_BITS_PER_WIDEST_FAST_INT */
#define CLEAR_HARD_REG_SET(TO) \
do { HARD_REG_ELT_TYPE *scan_tp_ = (TO); \
#endif
#endif
-/* Define some standard sets of registers. */
+/* Iterator for hard register sets. */
-/* 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];
+typedef struct
+{
+ /* Pointer to the current element. */
+ HARD_REG_ELT_TYPE *pelt;
-/* The same info as a HARD_REG_SET. */
+ /* The length of the set. */
+ unsigned short length;
-extern HARD_REG_SET fixed_reg_set;
+ /* Word within the current element. */
+ unsigned short word_no;
-/* 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. */
+ /* Contents of the actually processed word. When finding next bit
+ it is shifted right, so that the actual bit is always the least
+ significant bit of ACTUAL. */
+ HARD_REG_ELT_TYPE bits;
+} hard_reg_set_iterator;
-extern char call_used_regs[FIRST_PSEUDO_REGISTER];
+#define HARD_REG_ELT_BITS UHOST_BITS_PER_WIDE_INT
-#ifdef CALL_REALLY_USED_REGISTERS
-extern char call_really_used_regs[];
+/* The implementation of the iterator functions is fully analogous to
+ the bitmap iterators. */
+static inline void
+hard_reg_set_iter_init (hard_reg_set_iterator *iter, HARD_REG_SET set,
+ unsigned min, unsigned *regno)
+{
+#ifdef HARD_REG_SET_LONGS
+ iter->pelt = set;
+ iter->length = HARD_REG_SET_LONGS;
+#else
+ iter->pelt = &set;
+ iter->length = 1;
#endif
+ iter->word_no = min / HARD_REG_ELT_BITS;
+ if (iter->word_no < iter->length)
+ {
+ iter->bits = iter->pelt[iter->word_no];
+ iter->bits >>= min % HARD_REG_ELT_BITS;
+
+ /* This is required for correct search of the next bit. */
+ min += !iter->bits;
+ }
+ *regno = min;
+}
-/* 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;
+static inline bool
+hard_reg_set_iter_set (hard_reg_set_iterator *iter, unsigned *regno)
+{
+ while (1)
+ {
+ /* Return false when we're advanced past the end of the set. */
+ if (iter->word_no >= iter->length)
+ return false;
+
+ if (iter->bits)
+ {
+ /* Find the correct bit and return it. */
+ while (!(iter->bits & 1))
+ {
+ iter->bits >>= 1;
+ *regno += 1;
+ }
+ return (*regno < FIRST_PSEUDO_REGISTER);
+ }
+
+ /* Round to the beginning of the next word. */
+ *regno = (*regno + HARD_REG_ELT_BITS - 1);
+ *regno -= *regno % HARD_REG_ELT_BITS;
+
+ /* Find the next non-zero word. */
+ while (++iter->word_no < iter->length)
+ {
+ iter->bits = iter->pelt[iter->word_no];
+ if (iter->bits)
+ break;
+ *regno += HARD_REG_ELT_BITS;
+ }
+ }
+}
-/* 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 TARGET_STRUCT_VALUE_RTX or STATIC_CHAIN_REGNUM. These are the
- registers that cannot hold quantities across calls even if we are
- willing to save and restore them. */
+static inline void
+hard_reg_set_iter_next (hard_reg_set_iterator *iter, unsigned *regno)
+{
+ iter->bits >>= 1;
+ *regno += 1;
+}
-extern char call_fixed_regs[FIRST_PSEUDO_REGISTER];
+#define EXECUTE_IF_SET_IN_HARD_REG_SET(SET, MIN, REGNUM, ITER) \
+ for (hard_reg_set_iter_init (&(ITER), (SET), (MIN), &(REGNUM)); \
+ hard_reg_set_iter_set (&(ITER), &(REGNUM)); \
+ hard_reg_set_iter_next (&(ITER), &(REGNUM)))
-/* The same info as a HARD_REG_SET. */
-extern HARD_REG_SET call_fixed_reg_set;
+/* Define some standard sets of registers. */
/* Indexed by hard register number, contains 1 for registers
that are being used for global register decls.
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. */
+struct target_hard_regs {
+ /* The set of registers that actually exist on the current target. */
+ HARD_REG_SET x_accessible_reg_set;
-extern HARD_REG_SET regs_invalidated_by_call;
+ /* The set of registers that should be considered to be register
+ operands. It is a subset of x_accessible_reg_set. */
+ HARD_REG_SET x_operand_reg_set;
-#ifdef REG_ALLOC_ORDER
-/* Table of register numbers in the order in which to try to use them. */
+ /* 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. */
+ char x_fixed_regs[FIRST_PSEUDO_REGISTER];
-extern int reg_alloc_order[FIRST_PSEUDO_REGISTER];
+ /* The same info as a HARD_REG_SET. */
+ HARD_REG_SET x_fixed_reg_set;
-/* The inverse of reg_alloc_order. */
+ /* 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. */
+ char x_call_used_regs[FIRST_PSEUDO_REGISTER];
-extern int inv_reg_alloc_order[FIRST_PSEUDO_REGISTER];
-#endif
+ char x_call_really_used_regs[FIRST_PSEUDO_REGISTER];
-/* For each reg class, a HARD_REG_SET saying which registers are in it. */
+ /* The same info as a HARD_REG_SET. */
+ HARD_REG_SET x_call_used_reg_set;
-extern HARD_REG_SET reg_class_contents[N_REG_CLASSES];
+ /* Contains registers that are fixed use -- i.e. in fixed_reg_set -- or
+ a function value return register or TARGET_STRUCT_VALUE_RTX or
+ STATIC_CHAIN_REGNUM. These are the registers that cannot hold quantities
+ across calls even if we are willing to save and restore them. */
+ HARD_REG_SET x_call_fixed_reg_set;
-/* For each reg class, number of regs it contains. */
+ /* 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. */
+ HARD_REG_SET x_regs_invalidated_by_call;
-extern unsigned int reg_class_size[N_REG_CLASSES];
+ /* Call used hard registers which can not be saved because there is no
+ insn for this. */
+ HARD_REG_SET x_no_caller_save_reg_set;
-/* For each pair of reg classes,
- a largest reg class contained in their union. */
+ /* Table of register numbers in the order in which to try to use them. */
+ int x_reg_alloc_order[FIRST_PSEUDO_REGISTER];
-extern enum reg_class reg_class_subunion[N_REG_CLASSES][N_REG_CLASSES];
+ /* The inverse of reg_alloc_order. */
+ int x_inv_reg_alloc_order[FIRST_PSEUDO_REGISTER];
-/* For each pair of reg classes,
- the smallest reg class that contains their union. */
+ /* For each reg class, a HARD_REG_SET saying which registers are in it. */
+ HARD_REG_SET x_reg_class_contents[N_REG_CLASSES];
-extern enum reg_class reg_class_superunion[N_REG_CLASSES][N_REG_CLASSES];
+ /* For each reg class, a boolean saying whether the class contains only
+ fixed registers. */
+ bool x_class_only_fixed_regs[N_REG_CLASSES];
-/* Vector indexed by hardware reg giving its name. */
+ /* For each reg class, number of regs it contains. */
+ unsigned int x_reg_class_size[N_REG_CLASSES];
+
+ /* For each reg class, table listing all the classes contained in it. */
+ enum reg_class x_reg_class_subclasses[N_REG_CLASSES][N_REG_CLASSES];
+
+ /* For each pair of reg classes,
+ a largest reg class contained in their union. */
+ enum reg_class x_reg_class_subunion[N_REG_CLASSES][N_REG_CLASSES];
+
+ /* For each pair of reg classes,
+ the smallest reg class that contains their union. */
+ enum reg_class x_reg_class_superunion[N_REG_CLASSES][N_REG_CLASSES];
+
+ /* Vector indexed by hardware reg giving its name. */
+ const char *x_reg_names[FIRST_PSEUDO_REGISTER];
+};
+
+extern struct target_hard_regs default_target_hard_regs;
+#if SWITCHABLE_TARGET
+extern struct target_hard_regs *this_target_hard_regs;
+#else
+#define this_target_hard_regs (&default_target_hard_regs)
+#endif
-extern const char * reg_names[FIRST_PSEUDO_REGISTER];
+#define accessible_reg_set \
+ (this_target_hard_regs->x_accessible_reg_set)
+#define operand_reg_set \
+ (this_target_hard_regs->x_operand_reg_set)
+#define fixed_regs \
+ (this_target_hard_regs->x_fixed_regs)
+#define fixed_reg_set \
+ (this_target_hard_regs->x_fixed_reg_set)
+#define call_used_regs \
+ (this_target_hard_regs->x_call_used_regs)
+#define call_really_used_regs \
+ (this_target_hard_regs->x_call_really_used_regs)
+#define call_used_reg_set \
+ (this_target_hard_regs->x_call_used_reg_set)
+#define call_fixed_reg_set \
+ (this_target_hard_regs->x_call_fixed_reg_set)
+#define regs_invalidated_by_call \
+ (this_target_hard_regs->x_regs_invalidated_by_call)
+#define no_caller_save_reg_set \
+ (this_target_hard_regs->x_no_caller_save_reg_set)
+#define reg_alloc_order \
+ (this_target_hard_regs->x_reg_alloc_order)
+#define inv_reg_alloc_order \
+ (this_target_hard_regs->x_inv_reg_alloc_order)
+#define reg_class_contents \
+ (this_target_hard_regs->x_reg_class_contents)
+#define class_only_fixed_regs \
+ (this_target_hard_regs->x_class_only_fixed_regs)
+#define reg_class_size \
+ (this_target_hard_regs->x_reg_class_size)
+#define reg_class_subclasses \
+ (this_target_hard_regs->x_reg_class_subclasses)
+#define reg_class_subunion \
+ (this_target_hard_regs->x_reg_class_subunion)
+#define reg_class_superunion \
+ (this_target_hard_regs->x_reg_class_superunion)
+#define reg_names \
+ (this_target_hard_regs->x_reg_names)
/* Vector indexed by reg class giving its name. */
OSDN Git Service
