Electronics and Communication Engineering (ECE) Exam > Electronics and Communication Engineering (ECE) Videos > MIPS Assembly Programming Simplified > MIPS Tutorial 23 If statements Branching Instructions
MIPS Tutorial 23 If statements Branching Instructions Video Lecture | MIPS Assembly Programming Simplified - Electronics and Communication Engineering (ECE)
FAQs on MIPS Tutorial 23 If statements Branching Instructions Video Lecture - MIPS Assembly Programming Simplified - Electronics and Communication Engineering (ECE)
| 1. What are branching instructions in MIPS? |  |
Ans. Branching instructions in MIPS are instructions that allow the program to change its flow of execution based on a condition. These instructions are used to implement decision-making statements like if-else or switch statements in the MIPS assembly language.
| 2. How do if statements work in MIPS? | |
Ans. In MIPS, if statements are implemented using conditional branching instructions. The program evaluates a condition using a comparison instruction, and if the condition is true, it branches to the specified target address to execute the statements inside the if block. If the condition is false, the program continues to the next instruction after the if block.
| 3. What is the syntax for an if statement in MIPS? | |
Ans. The syntax for an if statement in MIPS assembly language is as follows:
beq $s, $t, label
Here, $s and $t are the registers holding the values to be compared, and label is the target label where the program branches if the condition is true. If the condition is false, the program continues to the next instruction after the branch.
| 4. How can I implement nested if statements in MIPS? | |
Ans. Nested if statements in MIPS can be implemented by using multiple if-else blocks within each other. Each if block should be properly indented and have its own condition and target labels. The program will branch to the appropriate target labels based on the conditions, executing the code inside the nested if blocks accordingly.
| 5. Can I use else statements with if statements in MIPS? | |
Ans. Yes, else statements can be used with if statements in MIPS. After the if block, an else block can be included using a separate branch instruction. If the condition of the if statement is false, the program will branch to the target label specified in the else block, allowing the execution of the statements inside the else block.
Text Transcript from Video
hello guys this is a Mel and welcome
back and today we're gonna talk about
conditional statements so for for those
of you who have experience in
programming then you know what I'm
talking about it's just you know
conditionals in programming is like one
of the basic concepts that without
conditionals it would be very difficult
to make programs because conditionals
allow us to to make decisions I mean it
allows us to specify the computer to
make decisions so let's begin go to file
new save it to your desktop and then
give it a name I'm gonna call mine
conditionals dad ASM safe and then you
know conditionals are like if they meant
L statements so we have two sections the
data in that text so the data for all
the data and text for the instructions
so I want to have a few messages here so
let me make a message give it a name and
then the data type is text that asked
easy and then the numbers are equal okay
and another message I'm going to call a
message to the data type is that ask
easy and I'm gonna say nothing happened
okay so I have these two messages right
here the numbers are equal and nothing
happened so in the instructions section
I'm gonna make a label for my main
function and I have to this is mandatory
I have to make a Cisco to end the
program so I'm gonna make a Cisco to end
the program and as you know or you
should know by now if you watch my
previous tutorials it's loaded media
Dallas I'm V 0 comma 10 and Cisco so
this is going to tell the system to and
that the program is going to end here
alright so
let's say that we have two numbers right
and I'm gonna say our immediate data
sine T 0 del a sine is 0 the sine 0
comma 5 and I have another number re
mediate tell us sine T 1 tell assign 0
comma 20 so the numbers are different
but um let's say that I want to compare
let's say I want to compare and okay
computer I want to know if the numbers
in t 0 and the number in T 1 I want to
know if they're if they're equal how can
you do that well you use a special
instruction and the instruction is
called branch if equal right here PQ
branch if equal so it takes 3 parameters
or 3 yeah 3 parameters the first
register that you want to compare you
want to compare to the second register
that you want to compare and finally it
takes a label but what is a label well
let me explain you well let's say I'm
gonna have a label I'm gonna make it
right now so I'm gonna give it a name
numbers equal this is my label right
here so unlabeled is just like right
here this is a label this is a label
this is a label it's just that it's just
a name with : after it so let's make a
label so my label is gonna be number
numbers equal so there's gonna be a body
for the label and the body for the label
is just like let's say the body for a
function so it's just instructions or
whatever you want to do so I just want
to display loaded loading media Dallas
I'm V 0 comma 4 to display text loaded
the rest of the song is the
, message and finally I want to do Cisco
so this is going to display the numbers
are equal but this is going to be
displayed only if the numbers are equal
and I have to do the same thing right
here I have to specify that I have to
specify that this is the end of the
program so it's always you know because
if you don't do this right if you don't
specify that this is the end of the
program in the label then if there are
more labels down here then the labels
are going to execute as well so it's
always good practice to do this as well
right here so this is the end so we
shouldn't go down here you don't have to
in this case so yeah so let's see let's
see how it works so we have this right
here we have this code and we have these
two numbers five is in t0 20 is in T 1
so we're saying be Q branch if equal t0
t1 numbers equal so if the following T 0
is equal to the volume T 1 is gonna go
to numbers equal but right now that is
not true that is not true they are
different so let's see what happens safe
run a symbol and execute voila nothing
happened
it's it's just like it's just like
nothing happened right
it's just empty so um what if I what if
they're equal let's say that I change 5
to 20 - ok save it so 5 now is 20 I mean
what's 5 be five before now is 20 so
they're equal now so let's see what
happens save run assemble and execute
voila the numbers are equal let me show
you again so execute the numbers are
equal so you see this is very important
because now you have the power to tell
the pro
to go to any to any place you want to
according to a condition so if the
condition is met then it's going to go
to the specified label so let's say that
I have five and twenty as it was before
now the numbers are different but I want
to go here if the numbers are different
so the condition would be be an e branch
if not equal branch if not equal so if
they're not equal they're going to go to
this label two numbers equal but it
makes no sense so I'm gonna say numbers
different numbers different and right
here it's gonna be numbers different and
the message is going to be the numbers
are different so we can see that if the
numbers are different which is true
because five is different than twenty or
from twenty it's gonna go two numbers
different and numbers different is going
to display the message so so let's go
save run assemble execute voila the
numbers are different so because five is
different than twenty then the numbers
are different and it's gonna go to this
place what if they're equal well if they
are twenty and twenty then it's not
gonna do anything it's not gonna it's
not gonna you see this blank empty
nothing white space because it didn't
come here so you can see we have these
two instructions branch if equal and
branch if not equal and there's another
there's another instruction this
instruction doesn't take any condition
and needs be or branch so this is
unconditional so we're just going to go
to a label so if you just want to go
there
you can just you don't even need the
numbers anymore so you can just like say
branch two numbers different so which is
gonna it doesn't matter if they're
different
if they're if they're equal is just
gonna go to this place it's gonna go
down here so save wrong assemble and
execute voila the numbers are different
one more time wrong a simple execute the
numbers are different so it doesn't
matter if I have five again it's gonna
do it anyways so the numbers are
different so today we have learned very
important stuff we have learned that you
have three conditionals basically there
are more but the other ones are pseudo
instruction so I'm going to teach you
this later but basically have three you
have B you have branch if equal and you
have branch if not equal so these two
they take conditions and they're going
to go to a label depending on if the
condition is met and this one so it
doesn't take any condition so it's just
going to go to the label and remember
this line right here right here is this
code to end the program this is very
important because if you didn't if you
didn't include the line right here
this label would execute anyways so if
you deleted this it would go to the
label anyways so that's why it's very
important to have this line right here
so thank you for watching this tutorial
my name is Mel and and see you next time
I hope you enjoyed this and I hope that
this knowledge is going to be useful for
you see you
back and today we're gonna talk about
conditional statements so for for those
of you who have experience in
programming then you know what I'm
talking about it's just you know
conditionals in programming is like one
of the basic concepts that without
conditionals it would be very difficult
to make programs because conditionals
allow us to to make decisions I mean it
allows us to specify the computer to
make decisions so let's begin go to file
new save it to your desktop and then
give it a name I'm gonna call mine
conditionals dad ASM safe and then you
know conditionals are like if they meant
L statements so we have two sections the
data in that text so the data for all
the data and text for the instructions
so I want to have a few messages here so
let me make a message give it a name and
then the data type is text that asked
easy and then the numbers are equal okay
and another message I'm going to call a
message to the data type is that ask
easy and I'm gonna say nothing happened
okay so I have these two messages right
here the numbers are equal and nothing
happened so in the instructions section
I'm gonna make a label for my main
function and I have to this is mandatory
I have to make a Cisco to end the
program so I'm gonna make a Cisco to end
the program and as you know or you
should know by now if you watch my
previous tutorials it's loaded media
Dallas I'm V 0 comma 10 and Cisco so
this is going to tell the system to and
that the program is going to end here
alright so
let's say that we have two numbers right
and I'm gonna say our immediate data
sine T 0 del a sine is 0 the sine 0
comma 5 and I have another number re
mediate tell us sine T 1 tell assign 0
comma 20 so the numbers are different
but um let's say that I want to compare
let's say I want to compare and okay
computer I want to know if the numbers
in t 0 and the number in T 1 I want to
know if they're if they're equal how can
you do that well you use a special
instruction and the instruction is
called branch if equal right here PQ
branch if equal so it takes 3 parameters
or 3 yeah 3 parameters the first
register that you want to compare you
want to compare to the second register
that you want to compare and finally it
takes a label but what is a label well
let me explain you well let's say I'm
gonna have a label I'm gonna make it
right now so I'm gonna give it a name
numbers equal this is my label right
here so unlabeled is just like right
here this is a label this is a label
this is a label it's just that it's just
a name with : after it so let's make a
label so my label is gonna be number
numbers equal so there's gonna be a body
for the label and the body for the label
is just like let's say the body for a
function so it's just instructions or
whatever you want to do so I just want
to display loaded loading media Dallas
I'm V 0 comma 4 to display text loaded
the rest of the song is the
, message and finally I want to do Cisco
so this is going to display the numbers
are equal but this is going to be
displayed only if the numbers are equal
and I have to do the same thing right
here I have to specify that I have to
specify that this is the end of the
program so it's always you know because
if you don't do this right if you don't
specify that this is the end of the
program in the label then if there are
more labels down here then the labels
are going to execute as well so it's
always good practice to do this as well
right here so this is the end so we
shouldn't go down here you don't have to
in this case so yeah so let's see let's
see how it works so we have this right
here we have this code and we have these
two numbers five is in t0 20 is in T 1
so we're saying be Q branch if equal t0
t1 numbers equal so if the following T 0
is equal to the volume T 1 is gonna go
to numbers equal but right now that is
not true that is not true they are
different so let's see what happens safe
run a symbol and execute voila nothing
happened
it's it's just like it's just like
nothing happened right
it's just empty so um what if I what if
they're equal let's say that I change 5
to 20 - ok save it so 5 now is 20 I mean
what's 5 be five before now is 20 so
they're equal now so let's see what
happens save run assemble and execute
voila the numbers are equal let me show
you again so execute the numbers are
equal so you see this is very important
because now you have the power to tell
the pro
to go to any to any place you want to
according to a condition so if the
condition is met then it's going to go
to the specified label so let's say that
I have five and twenty as it was before
now the numbers are different but I want
to go here if the numbers are different
so the condition would be be an e branch
if not equal branch if not equal so if
they're not equal they're going to go to
this label two numbers equal but it
makes no sense so I'm gonna say numbers
different numbers different and right
here it's gonna be numbers different and
the message is going to be the numbers
are different so we can see that if the
numbers are different which is true
because five is different than twenty or
from twenty it's gonna go two numbers
different and numbers different is going
to display the message so so let's go
save run assemble execute voila the
numbers are different so because five is
different than twenty then the numbers
are different and it's gonna go to this
place what if they're equal well if they
are twenty and twenty then it's not
gonna do anything it's not gonna it's
not gonna you see this blank empty
nothing white space because it didn't
come here so you can see we have these
two instructions branch if equal and
branch if not equal and there's another
there's another instruction this
instruction doesn't take any condition
and needs be or branch so this is
unconditional so we're just going to go
to a label so if you just want to go
there
you can just you don't even need the
numbers anymore so you can just like say
branch two numbers different so which is
gonna it doesn't matter if they're
different
if they're if they're equal is just
gonna go to this place it's gonna go
down here so save wrong assemble and
execute voila the numbers are different
one more time wrong a simple execute the
numbers are different so it doesn't
matter if I have five again it's gonna
do it anyways so the numbers are
different so today we have learned very
important stuff we have learned that you
have three conditionals basically there
are more but the other ones are pseudo
instruction so I'm going to teach you
this later but basically have three you
have B you have branch if equal and you
have branch if not equal so these two
they take conditions and they're going
to go to a label depending on if the
condition is met and this one so it
doesn't take any condition so it's just
going to go to the label and remember
this line right here right here is this
code to end the program this is very
important because if you didn't if you
didn't include the line right here
this label would execute anyways so if
you deleted this it would go to the
label anyways so that's why it's very
important to have this line right here
so thank you for watching this tutorial
my name is Mel and and see you next time
I hope you enjoyed this and I hope that
this knowledge is going to be useful for
you see you
About this Video
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Nov 23, 2024 Last updated |
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