#define CLASS_MAX_NREGS(CLASS, MODE) \
((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD)
+/* If defined, gives a class of registers that cannot be used as the
+ operand of a SUBREG that changes the size of the object. */
+
+#define CLASS_CANNOT_CHANGE_SIZE FLOAT_REGS
+
/* Define the cost of moving between registers of various classes. Moving
between FLOAT_REGS and anything else except float regs is expensive.
In fact, we make it quite expensive because we really don't want to