58 		 * v0 = all-zero word  in key_schedule_128()
59 		 * v1 = constant -8 / +8, copied into four words  in key_schedule_128()
60 		 * v2 = current subkey  in key_schedule_128()
62 		 * v6 = constant 8, copied into four words  in key_schedule_128()
63 		 * v7 = constant 0x11B, copied into four words  in key_schedule_128()
64 		 * v8 = constant for byteswapping words  in key_schedule_128()
68 		vspltisw(1, -8)  in key_schedule_128()
167 		 * v0 = all-zero word  in key_schedule_192()
168 		 * v1 = constant -8 / +8, copied into four words  in key_schedule_192()
169 		 * v2, v3 = current subkey  in key_schedule_192()
170 		 * v5 = Rcon (x4 words) (already shifted on big-endian)  in key_schedule_192()
171 		 * v6 = constant 8, copied into four words  in key_schedule_192()
172 		 * v8 = constant for byteswapping words  in key_schedule_192()
178 		vspltisw(1, -8)  in key_schedule_192()
197 		 * bits of subkeys, with a 64-bit overlap.  in key_schedule_192()
234 		 * Update Rcon. Since for a 192-bit key, we use only 8  in key_schedule_192()
241 		 * Write out the two left 128-bit words  in key_schedule_192()
305 		 * v0 = all-zero word  in key_schedule_256()
306 		 * v1 = constant -8 / +8, copied into four words  in key_schedule_256()
307 		 * v2, v3 = current subkey  in key_schedule_256()
308 		 * v6 = Rcon (x4 words) (already shifted on big-endian)  in key_schedule_256()
309 		 * v7 = constant 8, copied into four words  in key_schedule_256()
310 		 * v8 = constant for byteswapping words  in key_schedule_256()
316 		vspltisw(1, -8)  in key_schedule_256()
342 		 * Current words are in v2:v3. Compute next word in v4.  in key_schedule_256()
372 		 * Update Rcon. Since for a 256-bit key, we use only 7  in key_schedule_256()
379 		 * Write out the two left 128-bit words  in key_schedule_256()