b label == beq $0,$0,offset
Here is a table of branch instructions. There are additional branch instructions used for subroutine linkage that have been omitted. Some instructions assume 32-bit two's complement data; others assume 32-bit unsigned data. Some instructions don't assume any data format.
The first operand s must be a register.
The second operand t may be a register or an
immediate operand
(the extended assembler will generate the correct basic instructions
depending on which you choose).
The label designates an address that can be reached by adding a 18-bit, sign-extended integer to the PC. The 18 bits come from an immediate operand (shifted left two positions) of the machine instruction. This means the branch target must be within plus or minus 128K from the current instruction.
Some of the pseudoinstructions use the assembler temporary register
($at,
or register
$1)
in the one or two basic instructions they
are translated into.
| Mnemonic | Operands | Description | signed or unsigned? |
Mnemonic | Operands | Description | signed or unsigned? |
|---|---|---|---|---|---|---|---|
| b | label | branch | beq | s,t,label | branch if s==t | ||
| beqz | s,label | branch if s==0 | bge | s,t,label | branch if s>=t | signed | |
| bgeu | s,t,label | branch if s>=t | unsigned | bgez | s,label | branch if s>=0 | signed |
| bgt | s,t,label | branch if s>t | signed | bgtu | s,t,label | branch if s>t | unsigned |
| bgtz | s,label | branch if s>0 | signed | ble | s,t,label | branch if s<=t | signed |
| bleu | s,t,label | branch if s<=t | unsigned | blez | s,label | branch if s<=0 | signed |
| blt | s,t,label | branch if s<t | signed | bltu | s,t,label | branch if s<t | unsigned |
| bltz | s,label | branch if s<0 | signed | bnez | s,label | branch if s != 0 | |
| bne | s,t,label | branch if s != t | != means not equal | ||||
What format of data is assumed for the bne (branch not equal)
instruction?