MIPS R4000 Microprocessor User's Manual A-35
CPU Instruction Set Details
Format:
BLTZ rs, offset
Description:
A branch target address is computed from the sum of the address of the
instruction in the delay slot and the 16-bit offset, shifted left two bits and
sign-extended. If the contents of general register rs have the sign bit set,
then the program branches to the target address, with a delay of one
instruction.
Operation:
Exceptions:
None
BLTZ
Branch On Less Than Zero
31 2526 2021 1516 0
REGIMM rs BLTZ
offset
655 16
0 0 0 0 0 1 0 0 0 0 0
BLTZ
32 T: target ← (offset
15
)
14
|| offset || 0
2
condition ← (GPR[rs]
31
= 1)
T+1: if condition then
PC ← PC + target
endif
64 T: target ← (offset
15
)
46
|| offset || 0
2
condition ← (GPR[rs]
63
= 1)
T+1: if condition then
PC ← PC + target
endif
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