MIPS - Basic Instructions, Various Formats of Machine code representation
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The syntax of MIPS is quite simple in
comparison to a standard high-level language.Each statement starts with what type of operation you are planning to implement.Then
the required number of argument for that operation follows it.Generally return values of operation are sent to the first argument.Suppose
you wanted to add two numbers.In C this
would look something like:
V
= f + s
The equivalent MIPS would look
something like:
Add
v,f,s
Notice that the return value is the
first.It follows the left to right
reading conventions.
You can also create label.These
are used for control structures.I wont
into the detail but in general they are just defined with an alphanumeric
phrase that is different from any of the control statements.Example:
Label_one:
Laundry List of Basic Operations
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Operation
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Description
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Example
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Notes
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add
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Adds two numbers
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add v, s, d
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There are
a number of different varations depending on the nature of the inputs and
output.Such as unsigned, or
constants
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sub
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Subtract two numbers
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sub v, s, d
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There are
a number of different varations depending on the nature of the inputs and
output.Such as unsigned, or
constants
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mult
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Multiply two numbers
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mult v, s, d
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There are
a number of different varations depending on the nature of the inputs and
output.Such as unsigned, or
constants
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div
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Divide two numbers
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div v, s, d
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There are
a number of different varations depending on the nature of the inputs and
output.Such as unsigned, or
constants
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and
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Bit wise and two numbers
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and v, s, d
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or
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Bit wise or two numbers
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or v, s, d
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lw
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Load value from memory to register
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lw v, 100(m)
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Notice
how memory is represented.There is a
more complete usage in section 6 and/or 8
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sw
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Store value from register to memory
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sw v, 100(m)
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Notice
how memory is represented.There is a
more complete usage in section 6 and/or 8.Also notice that this operation doesn't follow the usual left to right
representation because the value of v (register) is sent to 100(m) (memory)
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beq
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Branch on equal
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beq v1,v2, 25
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This is
for control structure operations which are discussed in section 3
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j
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jump to target address
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j 2500
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This is
for control structure operations which are discussed in section 3, There are
also conditional jumps which are further defined in section 3
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There are many more operations that
extend from this list.Refer to the back
of the text book for a more complete listing.
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