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.
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.