参照元†
struct target_hard_regs {
void finalize ();
/* The set of registers that actually exist on the current target. */
HARD_REG_SET x_accessible_reg_set;
/* 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;
/* 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];
/* The same info as a HARD_REG_SET. */
HARD_REG_SET x_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. */
char x_call_used_regs[FIRST_PSEUDO_REGISTER];
char x_call_really_used_regs[FIRST_PSEUDO_REGISTER];
/* The same info as a HARD_REG_SET. */
HARD_REG_SET x_call_used_reg_set;
/* 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;
/* Contains registers that are fixed use -- i.e. in fixed_reg_set -- but
only if they are not merely part of that set because they are global
regs. Global regs that are not otherwise fixed can still take part
in register allocation. */
HARD_REG_SET x_fixed_nonglobal_reg_set;
/* 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;
/* 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;
/* Table of register numbers in the order in which to try to use them. */
int x_reg_alloc_order[FIRST_PSEUDO_REGISTER];
/* The inverse of reg_alloc_order. */
int x_inv_reg_alloc_order[FIRST_PSEUDO_REGISTER];
/* For each reg class, a HARD_REG_SET saying which registers are in it. */
HARD_REG_SET x_reg_class_contents[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];
/* 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];
/* Records which registers can form a particular subreg, with the subreg
being identified by its outer mode, inner mode and offset. */
hash_table <simplifiable_subregs_hasher> *x_simplifiable_subregs;
};
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