Electronics and Communication Engineering (ECE) Exam > Electronics and Communication Engineering (ECE) Videos > MIPS Assembly Programming Simplified > MIPS Tutorial 32 If Statements with Floats and Doubles
MIPS Tutorial 32 If Statements with Floats and Doubles Video Lecture | MIPS Assembly Programming Simplified - Electronics and Communication Engineering (ECE)
FAQs on MIPS Tutorial 32 If Statements with Floats and Doubles Video Lecture - MIPS Assembly Programming Simplified - Electronics and Communication Engineering (ECE)
| 1. How do I write an if statement in MIPS for comparing two floating-point numbers? |  |
Ans. In MIPS, you can use the `c.lt.s` (compare less than) or `c.le.s` (compare less than or equal to) instructions to compare two floating-point numbers. After the comparison, you can use the `bc1t` (branch if true) or `bc1f` (branch if false) instructions to conditionally execute code based on the comparison result.
| 2. Can I use if statements in MIPS to compare double-precision floating-point numbers? | |
Ans. No, the MIPS architecture does not have direct support for double-precision floating-point comparisons. However, you can use special instructions like `c.lt.d` and `c.le.d` to compare double-precision floating-point numbers if your MIPS processor supports them. Alternatively, you can convert double-precision numbers to single-precision before comparing them.
| 3. How do I handle NaN (Not a Number) values in if statements for floating-point numbers in MIPS? | |
Ans. MIPS provides special instructions like `c.un.s` and `c.un.d` to check whether a floating-point number is NaN. You can use these instructions in conjunction with conditional branches to handle NaN values in if statements. For example, you can branch to a specific label if a floating-point number is NaN using the `bc1u` (branch if unordered) instruction.
| 4. Can I use if-else statements in MIPS for floating-point comparisons? | |
Ans. Yes, you can use if-else statements in MIPS for floating-point comparisons. After the if statement, you can use the `beq` (branch if equal) or `bne` (branch if not equal) instructions to branch to the else part of the code based on the comparison result. This allows you to execute different code blocks based on the outcome of the floating-point comparison.
| 5. How do I compare floating-point numbers for equality in MIPS if statements? | |
Ans. Comparing floating-point numbers for equality can be tricky due to rounding errors. In MIPS, you can use the `c.eq.s` (compare equal) or `c.eq.d` (compare equal) instructions to check if two floating-point numbers are equal. However, it is recommended to compare floating-point numbers within a certain tolerance range instead of checking for exact equality. This can be done by comparing the absolute difference between the numbers to a small threshold value.
Text Transcript from Video
hi guys welcome back and this is a mail
and well today I'm very excited because
I'm going to teach you a very important
concept in MIPS assembly language and
that is the concept of conditionals but
remember I already told you how to
actually do conditions with integers but
when it comes to floating-point numbers
like let's say floats and doubles it's a
different story you have different
commands and remember when we're working
with floats and doubles now we don't use
these registers right here we don't you
stay the the regular registers we use
they're actually the special registers
in code processor 1 oh this right here
so I'm very excited let's go to file new
and I have a new file when I save it so
click on save give it a name it's gonna
be conditions so save it and now as
usual we have two sections of our
program that data contains all the
variables in random access memory and
that text for all the instructions and
because I want to follow good practices
I'm gonna make a label called main from
a main program and I'm gonna make a
system call system call to end the
program so this is gonna be the end of
the program or when the program is going
to terminate its like return 0 in C++ or
C I'm in the old versions so you do
loading media the last time V 0 comma 10
and Sysco so this is requesting a
service from the operating system this
is telling the upper new system to
terminate the program when it reaches
when the program reaches this command
right here it's like asking the
operating system to end the program so
now that I have the basic structure of
the
program I want to have some values and
random access memory so remember all the
other variables all the values in random
access in random access memory you have
to declare them in that in the data
section so let's begin and first I want
to have a message so I'm going to give
it a name message then : the data type
is going to be text so that ASCII Z and
it's gonna be it was true and backslash
n for a new line so I want this message
because I wanna test if let's say 214 no
214 point numbers maybe two floats are
equal maybe two doubles are equal so if
they are equal then this is gonna say it
was true so that's why I wanted this
message in random access memory I want a
second message so message to the data
type is gonna be the same because it's
text so that asked easy and it's gonna
be it was false so if the condition was
false I'm gonna print this out to the
screen and I also want to numbers and
they're gonna be floats they're gonna be
they're gonna have a decimal point so
number one and the data type is gonna be
float and the value let's say it's gonna
be ten point four I want one more number
let's say number two the data type is
gonna be float and the value is gonna be
let's say four point six so now I have
two messages in random access memory and
I have two floats in random access
memory and I have the main the main
label the main function you can call it
the main function right here so the
first thing I want to do is that I want
to
move these two numbers from random
access memory to registers I want to
move them to the processor because
that's the only way we'll be able to
perform comparison operations that's the
only way I have to move them to
registers so remember if you're working
with floats you use this command to to
move them from RAM two registers load
war load word coprocessor one and this
is like take take the value from random
access memory from random access memory
and put it in this register so now you
specify what register you want so I
wanted in yellow sign F zero and it's
gonna be number one
so now ten point four which is number
one right here it's gonna be stored in
this register F zero so I'm gonna do the
same thing for there for the second
number load word into coprocessor one
and I want to register the last hang F
two number two so this is going to take
the value in the address number two
which is four point six and it's going
to store that value in this register
inside the processor register F 2 and
pay attention to this I'm using F 0 F 2
for a special reason and the reason is
that sometimes you wanna change your
program to instead of floats or
Singapore single point precision numbers
you want to use doubles so remember that
doubles take two registers and they have
to be even number so that's what I'm
choosing these numbers right here just
in case I want to change it later but
don't worry about that
so we have this right here now
number ten point four is in F zero and
number four point six is in F 2 so what
I want to do now is that I want to show
you the first instruction and this is
going to be very important so pay
attention see that and when you press
that you see this options right here
so see that EQ that Dec that EQ that s
see that le Daddy
so all this is all these options their
their instructions and these are the
instructions to perform comparisons or
conditionals with floats and doubles so
as I told you before I want to check if
these two numbers these two floats are
equal so I'm going to choose the first
instruction see that EQ that that
actually the second see that EQ that s
because s is for floats and D is for
doubles so this is going to compare if
these two numbers are equal so you can
see see that EQ that s compare if these
two floats are equal so the first one I
want to compare is F zero compared with
F 2 and this is all we need this is
going to do the comparison but then how
do we know that it was true or false
well in this case we have to use another
instruction and the instruction is
branch if coprocessor one is true but we
can also use branch if coprocessor one
is false so let's say that these two
numbers are equal if they're equal
coprocessor one is going to be it's
going to be true but if they are not
equal coprocessor one is going to be
false so branch so what do I want to go
where do I want to branch so if they are
true I want to jump I want to go to a
different place so I'm going to go to a
place called exit and exit exit is just
a label that I'm gonna build right now
so I'm gonna count down here and I'm
gonna make a label exit whenever you're
making a label you just give it a name
and then you use : and this label right
here the code that that I'm gonna have
here is just to to show that second
message I mean that the first message it
was true so I'm gonna say load immediate
the last item is 0 comma 4 and
the comment to to bring a value to the
screen I requesting from the operating
system and then the value that I want to
print is the message so low the address
of the message into dollar sign is zero
message so you can see low the address
of the message into the low hanging zero
which is the argument and then I have to
tell a system to execute this to do it
this is a request from the operating
system so if it is true that this value
is equal to this value right here
it's going to jump to exit so in case
that it is false I will not print
another message so it's gonna it's gonna
be the following it's gonna be loading
media the last I have the zero comma for
Lord address the last song is zero and
the message is gonna be it was false so
it's gonna be message two and finally
I'm gonna do Cisco so before i execute
the program i'm gonna explain it to you
one more time so you will have a better
idea how it works so i have these values
in random access memory all the two
messages in two numbers
i have the main function right here so
this is like in c++ return 0 or it means
just terminate the program and the
program and what i'm doing here is that
I'm moving the value that flowed from
random access memory to memory to this
register and the same here and then I am
comparing the two numbers to make sure
that they're equal if they are equal
then coprocessor 1 is going to be set to
true and if then I'm going to check if
branch if coprocessor 1 is true so where
branch to exit or go to exit so this is
going to be this right here is going to
be all these right here it's going to be
ignored and it's going to come down here
to the exit but if this was false then
if this was followed false then it will
it would not
here it would just it would just go here
it would you it will just print a second
message and then it would terminate
so now let's execute now you know that
they're not equal so we should issue
just continue and show the second
message so save run assemble and execute
and as you can see it was false you see
that it is false at ten point four is
equal to four point six but now let's
make it let's make it equal right now
it's gonna be true so let's save it let
me clear this wrong assemble and execute
now you see it says it was true so you
can see that the program is working so
remember when we are comparing two
floats or two doubles we use this
special instruction called C and C
stands for compare so compare if these
two registers are equal compare if these
two floats are equal so if it is true
that they're equal like in this case
then coprocessor one is going to be set
to true and if co-producer one is set to
true then right here branch if it is
true then is going to branch to the
label that you specify and the label in
this case is exit so this is going to be
ignored and it's going to execute the
body of the exit which it should which
is going to print the message it was
false I mean it was true it was true so
you know as you you have theta equal but
you also have see that le just to
compare if they are less than or equal
to and remember if you if you're working
with doubles then you use that D if you
use if you're working with flow to use
that S and you also have a less than
less than less than or equal to and
equal to
so thank you for watching don't forget
to subscribe I will continue posting
more videos and don't forget to go to
smartphone your comm so thank you very
much and see you next time okay
and well today I'm very excited because
I'm going to teach you a very important
concept in MIPS assembly language and
that is the concept of conditionals but
remember I already told you how to
actually do conditions with integers but
when it comes to floating-point numbers
like let's say floats and doubles it's a
different story you have different
commands and remember when we're working
with floats and doubles now we don't use
these registers right here we don't you
stay the the regular registers we use
they're actually the special registers
in code processor 1 oh this right here
so I'm very excited let's go to file new
and I have a new file when I save it so
click on save give it a name it's gonna
be conditions so save it and now as
usual we have two sections of our
program that data contains all the
variables in random access memory and
that text for all the instructions and
because I want to follow good practices
I'm gonna make a label called main from
a main program and I'm gonna make a
system call system call to end the
program so this is gonna be the end of
the program or when the program is going
to terminate its like return 0 in C++ or
C I'm in the old versions so you do
loading media the last time V 0 comma 10
and Sysco so this is requesting a
service from the operating system this
is telling the upper new system to
terminate the program when it reaches
when the program reaches this command
right here it's like asking the
operating system to end the program so
now that I have the basic structure of
the
program I want to have some values and
random access memory so remember all the
other variables all the values in random
access in random access memory you have
to declare them in that in the data
section so let's begin and first I want
to have a message so I'm going to give
it a name message then : the data type
is going to be text so that ASCII Z and
it's gonna be it was true and backslash
n for a new line so I want this message
because I wanna test if let's say 214 no
214 point numbers maybe two floats are
equal maybe two doubles are equal so if
they are equal then this is gonna say it
was true so that's why I wanted this
message in random access memory I want a
second message so message to the data
type is gonna be the same because it's
text so that asked easy and it's gonna
be it was false so if the condition was
false I'm gonna print this out to the
screen and I also want to numbers and
they're gonna be floats they're gonna be
they're gonna have a decimal point so
number one and the data type is gonna be
float and the value let's say it's gonna
be ten point four I want one more number
let's say number two the data type is
gonna be float and the value is gonna be
let's say four point six so now I have
two messages in random access memory and
I have two floats in random access
memory and I have the main the main
label the main function you can call it
the main function right here so the
first thing I want to do is that I want
to
move these two numbers from random
access memory to registers I want to
move them to the processor because
that's the only way we'll be able to
perform comparison operations that's the
only way I have to move them to
registers so remember if you're working
with floats you use this command to to
move them from RAM two registers load
war load word coprocessor one and this
is like take take the value from random
access memory from random access memory
and put it in this register so now you
specify what register you want so I
wanted in yellow sign F zero and it's
gonna be number one
so now ten point four which is number
one right here it's gonna be stored in
this register F zero so I'm gonna do the
same thing for there for the second
number load word into coprocessor one
and I want to register the last hang F
two number two so this is going to take
the value in the address number two
which is four point six and it's going
to store that value in this register
inside the processor register F 2 and
pay attention to this I'm using F 0 F 2
for a special reason and the reason is
that sometimes you wanna change your
program to instead of floats or
Singapore single point precision numbers
you want to use doubles so remember that
doubles take two registers and they have
to be even number so that's what I'm
choosing these numbers right here just
in case I want to change it later but
don't worry about that
so we have this right here now
number ten point four is in F zero and
number four point six is in F 2 so what
I want to do now is that I want to show
you the first instruction and this is
going to be very important so pay
attention see that and when you press
that you see this options right here
so see that EQ that Dec that EQ that s
see that le Daddy
so all this is all these options their
their instructions and these are the
instructions to perform comparisons or
conditionals with floats and doubles so
as I told you before I want to check if
these two numbers these two floats are
equal so I'm going to choose the first
instruction see that EQ that that
actually the second see that EQ that s
because s is for floats and D is for
doubles so this is going to compare if
these two numbers are equal so you can
see see that EQ that s compare if these
two floats are equal so the first one I
want to compare is F zero compared with
F 2 and this is all we need this is
going to do the comparison but then how
do we know that it was true or false
well in this case we have to use another
instruction and the instruction is
branch if coprocessor one is true but we
can also use branch if coprocessor one
is false so let's say that these two
numbers are equal if they're equal
coprocessor one is going to be it's
going to be true but if they are not
equal coprocessor one is going to be
false so branch so what do I want to go
where do I want to branch so if they are
true I want to jump I want to go to a
different place so I'm going to go to a
place called exit and exit exit is just
a label that I'm gonna build right now
so I'm gonna count down here and I'm
gonna make a label exit whenever you're
making a label you just give it a name
and then you use : and this label right
here the code that that I'm gonna have
here is just to to show that second
message I mean that the first message it
was true so I'm gonna say load immediate
the last item is 0 comma 4 and
the comment to to bring a value to the
screen I requesting from the operating
system and then the value that I want to
print is the message so low the address
of the message into dollar sign is zero
message so you can see low the address
of the message into the low hanging zero
which is the argument and then I have to
tell a system to execute this to do it
this is a request from the operating
system so if it is true that this value
is equal to this value right here
it's going to jump to exit so in case
that it is false I will not print
another message so it's gonna it's gonna
be the following it's gonna be loading
media the last I have the zero comma for
Lord address the last song is zero and
the message is gonna be it was false so
it's gonna be message two and finally
I'm gonna do Cisco so before i execute
the program i'm gonna explain it to you
one more time so you will have a better
idea how it works so i have these values
in random access memory all the two
messages in two numbers
i have the main function right here so
this is like in c++ return 0 or it means
just terminate the program and the
program and what i'm doing here is that
I'm moving the value that flowed from
random access memory to memory to this
register and the same here and then I am
comparing the two numbers to make sure
that they're equal if they are equal
then coprocessor 1 is going to be set to
true and if then I'm going to check if
branch if coprocessor 1 is true so where
branch to exit or go to exit so this is
going to be this right here is going to
be all these right here it's going to be
ignored and it's going to come down here
to the exit but if this was false then
if this was followed false then it will
it would not
here it would just it would just go here
it would you it will just print a second
message and then it would terminate
so now let's execute now you know that
they're not equal so we should issue
just continue and show the second
message so save run assemble and execute
and as you can see it was false you see
that it is false at ten point four is
equal to four point six but now let's
make it let's make it equal right now
it's gonna be true so let's save it let
me clear this wrong assemble and execute
now you see it says it was true so you
can see that the program is working so
remember when we are comparing two
floats or two doubles we use this
special instruction called C and C
stands for compare so compare if these
two registers are equal compare if these
two floats are equal so if it is true
that they're equal like in this case
then coprocessor one is going to be set
to true and if co-producer one is set to
true then right here branch if it is
true then is going to branch to the
label that you specify and the label in
this case is exit so this is going to be
ignored and it's going to execute the
body of the exit which it should which
is going to print the message it was
false I mean it was true it was true so
you know as you you have theta equal but
you also have see that le just to
compare if they are less than or equal
to and remember if you if you're working
with doubles then you use that D if you
use if you're working with flow to use
that S and you also have a less than
less than less than or equal to and
equal to
so thank you for watching don't forget
to subscribe I will continue posting
more videos and don't forget to go to
smartphone your comm so thank you very
much and see you next time okay
About this Video
|
Nov 22, 2024 Last updated |
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