
APPENDIX A MIPS III INSTRUCTION SET DETAILS
Preliminary User’s Manual S15543EJ1V0UM
449
BEQL
Branch On Equal Likely
BEQL
rs
BEQL
0 1 0 1 0 0
rt offset
31 26 25 21 20 16 15 0
655 16
Format:
BEQL rs, rt, 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. The contents of general register
rs
and the contents of general
register
rt
are compared. If the two registers are equal, the target address is branched to, with a delay of one
instruction. If the conditional branch is not taken, the instruction in the branch delay slot is nullified.
Operation:
32 T:
target ← (offset
15
)
14
|| offset || 0
2
condition ← (GPR [rs] = GPR [rt])
T+1: if condition then
PC ← PC + target
else
NullifyCurrentInstruction
endif
64 T:
target ← (offset15
)
46
|| offset || 0
2
condition ← (GPR [rs] = GPR [rt])
T+1: if condition then
PC ← PC + target
else
NullifyCurrentInstruction
endif
Exceptions:
None
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