Nintendo Ultra64 Programmer's Manual page 228

SUBU
31
SPECIAL
0 0 0 0 0 0
6
Format:
subu rd, rs, rt
Description:
The contents of general register
result.
The result is placed into general register
Since the RSP does not signal an overflow exception for SUB, this command behaves identically to
SUBU.
Operation:
GPR[rd]  GPR[rs] – GPR[rt]
T:
Exceptions:
None
228
Subtract Unsigned
26 25 21 20
rs
5
rt
16 15 11 10
rt rd
5 5
are subtracted from the contents of general register
rd
.
SUBU
6 5
0 SUBU
0 0 0 0 0 1 0 0 0 1 1
5 6
0
rs
to form a