x = avoid_constant_pool_reference (x);
return GET_CODE (x) == CONST_DOUBLE;
}
+\f
+/* If M is a bitmask that selects a field of low-order bits within an item but
+ not the entire word, return the length of the field. Return -1 otherwise.
+ M is used in machine mode MODE. */
+
+int
+low_bitmask_len (enum machine_mode mode, unsigned HOST_WIDE_INT m)
+{
+ if (mode != VOIDmode)
+ {
+ if (GET_MODE_BITSIZE (mode) > HOST_BITS_PER_WIDE_INT)
+ return -1;
+ m &= GET_MODE_MASK (mode);
+ }
+
+ return exact_log2 (m + 1);
+}