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(choose_hard_reg_mode): Define here. 

(reg_raw_mode): Define.
(init_reg_sets_1): Initialize reg_raw_mode.

From-SVN: r7087
This commit is contained in:
Doug Evans 1994-04-20 03:36:49 +00:00
parent d0c6176a4d
commit ca4aac003d
1 changed files with 58 additions and 0 deletions
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58
gcc/regclass.c
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@ -152,6 +152,13 @@ enum reg_class reg_class_superunion[N_REG_CLASSES][N_REG_CLASSES];
char *reg_names[] = REGISTER_NAMES;
/* For each hard register, the widest mode object that it can contain.
This will be a MODE_INT mode if the register can hold integers. Otherwise
it will be a MODE_FLOAT or a MODE_CC mode, whichever is valid for the
register. */
enum machine_mode reg_raw_mode[FIRST_PSEUDO_REGISTER];
/* Indexed by n, gives number of times (REG n) is set or clobbered.
This information remains valid for the rest of the compilation
of the current function; it is used to control register allocation.
@ -391,6 +398,57 @@ init_reg_sets_1 ()
if (call_fixed_regs[i])
SET_HARD_REG_BIT (call_fixed_reg_set, i);
}
/* Compute the table of register modes.
These values are used to record death information for individual registers
(as opposed to a multi-register mode).
This can't be done until HARD_REGNO_NREGS and HARD_REGNO_MODE_OK are
usable which is after OVERRIDE_OPTIONS on some targets. */
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
reg_raw_mode[i] = choose_hard_reg_mode (i, 1);
}
/* Return a machine mode that is legitimate for hard reg REGNO and large
enough to save nregs. If we can't find one, return VOIDmode. */
enum machine_mode
choose_hard_reg_mode (regno, nregs)
int regno;
int nregs;
{
enum machine_mode found_mode = VOIDmode, mode;
/* We first look for the largest integer mode that can be validly
held in REGNO. If none, we look for the largest floating-point mode.
If we still didn't find a valid mode, try CCmode. */
for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
mode != VOIDmode;
mode = GET_MODE_WIDER_MODE (mode))
if (HARD_REGNO_NREGS (regno, mode) == nregs
&& HARD_REGNO_MODE_OK (regno, mode))
found_mode = mode;
if (found_mode != VOIDmode)
return found_mode;
for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT);
mode != VOIDmode;
mode = GET_MODE_WIDER_MODE (mode))
if (HARD_REGNO_NREGS (regno, mode) == nregs
&& HARD_REGNO_MODE_OK (regno, mode))
found_mode = mode;
if (found_mode != VOIDmode)
return found_mode;
if (HARD_REGNO_NREGS (regno, CCmode) == nregs
&& HARD_REGNO_MODE_OK (regno, CCmode))
return CCmode;
/* We can't find a mode valid for this register. */
return VOIDmode;
}
/* Specify the usage characteristics of the register named NAME.