APPENDIX A MIPS III INSTRUCTION SET DETAILS
498 Preliminary Users Manual S15543EJ1V0UM
JAL Jump And Link JAL

JAL

0 0 0 0 1 1 target

31 26 25 0
626
Format:
JAL target
Description:
The 26-bit target address is shifted left two bits and combined with the high-order four bits of the address of the
delay slot. The program unconditionally jumps to this calculated address with a delay of one instruction. The
address of the instruction after the delay slot is placed in the link register,
r31
. The address of the instruction
immediately after a delay slot is placed in the link register (r31). When a MIPS16 instruction can be executed, the
value of bit 0 of r31 indicates the ISA mode bit before jump.
Operation:
32 T: temp target
If MIPS16En = 1 then
GPR[31] (PC+8)31..1 || ISA MODE
else
GPR[31] PC+8
endif
T+1: PC PC31..28 || temp || 02
64 T: temp target
If MIPS16EN = 1 then
GPR[31] (PC+8)63..1 || ISA MODE
else
GPR[31] PC+8
endif
T+1: PC PC63..28 || temp || 02
Exceptions:
None