mflo $15 # CHECK: mflo $15 # encoding: [0x00,0x00,0x78,0x12]
mthi $16 # CHECK: mthi $16 # encoding: [0x02,0x00,0x00,0x11]
mtlo $17 # CHECK: mtlo $17 # encoding: [0x02,0x20,0x00,0x13]
+ append $2, $3, 3 # CHECK: append $2, $3, 3 # encoding: [0x7c,0x62,0x18,0x31]
+ balign $4, $5, 1 # CHECK: balign $4, $5, 1 # encoding: [0x7c,0xa4,0x0c,0x31]
+ prepend $6, $7, 4 # CHECK: prepend $6, $7, 4 # encoding: [0x7c,0xe6,0x20,0x71]