Converting 2D array from C to MIPS assembly language (Beginner)

Hi there guys,

I am trying to understand how 2D arrays are implemented in MIPS assembly. Now I tried looking online for a few examples but they have no MIPS code so its hard for me to understand the logic behind implementing 2D arrays in MIPS.

Heres a random question I picked from a source.

Attachment 11876

On first glance, the question is easy to implement in C, C#, C++ and java however, when it comes to MIPS I get confused.

If someone can give me a sample code in MIPS then I would really appreciate it.

Cheers

Step 1 is write this as a 'C' function (not main).

Step 2 is compile it with "gcc -S prog.c"

Step 3 is study prog.s

Step 4 is read your MIPS assembler reference manual and try to match up the assembler you see with MIPS instructions.

I mean I dont want to convert it without understanding it. I was wondering if someone can explain me the MIPS code after conversion.

Do you have MIPS code for it already?

> I mean I dont want to convert it without understanding it.
There is very little danger of you arriving at MIPS code which works without you understanding it.

No I was wondering if someone can convert it to MIPS and explain whats happening =(

MIPS Assembly Language Examples

No, we're not here to do your work for you.

There are a TON of sites brought up by Google for MIPS assembly language programming:
Google

Including this gem:
Programmed Introduction to MIPS Assembly Language

What you want is not really C language help, so that's one problem. (many of us never learned, or have long since forgotten what we were taught about MIPS assembly language).

Second problem is we try to help people with THEIR work - it's a really rare day that we actually DO code up a problem, unless it's VERY trivial or interesting, and can't be readily discussed without having a program to show what we mean. Note that this is not the case with your problem. ;)

Third, your "random question" is not exactly "Hello World" is it? A first program with a 2D array in MIPS a.l., it seems to me, should consist of something far simpler.

Quote:

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Originally Posted by Adak

There are a TON of sites brought up by Google for MIPS assembly language programming:
Google

Including this gem:
Programmed Introduction to MIPS Assembly Language

What you want is not really C language help, so that's one problem. (many of us never learned, or have long since forgotten what we were taught about MIPS assembly language).

Second problem is we try to help people with THEIR work - it's a really rare day that we actually DO code up a problem, unless it's VERY trivial or interesting, and can't be readily discussed without having a program to show what we mean. Note that this is not the case with your problem. ;)

Third, your "random question" is not exactly "Hello World" is it? A first program with a 2D array in MIPS a.l., it seems to me, should consist of something far simpler.

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Hi there, Yes I understand basic MIPS and even implementing a 1D array. But just having difficulty with 2D arrays

Look into indexed addressing. That's how 2D arrays are usually done in assembly.

You know that this is not an ASM board, let alone a MIPS ASM board. I strongly suggest you ask your question over on an ASM board, with a far simpler example question - and please forget the name calling.

I can't begin to tell you how often students and lazy programmers drop requests for help similar to yours, just to get someone to do their code up for them.

Aren't all arrays (under the hood), done by using a base address + an increment on a pointer?

Quote:

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Originally Posted by bawse.c

Dont worry about it. I have a better chance figuring out on my own rather than relying on <unnecessarily offensive remark deliberately obscured so it didn't get caught by filters> in this forum.

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Isn't that EXACTLY what we were saying to you anyway? This isn't C, at all, and this is a C forum. You want to know how something would appear in MIPS assembly, but haven't tried to write it like that yourself. You're not interested in seeing working MIPS assembler as a compiler would churn out, either. You want someone on a C forum to bypass C entirely and write their own MIPS assembly directly to solve a stated problem which looks like a class exercise to me.

I suggest you do your own homework and never darken this forum with your presence again. But, of course, you'll have some insightful and witty comeback ready to hand, no doubt.

Quote:

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Originally Posted by bawse.c

you obviously didnt read my question...I posted this on a C forum because its easy to implement this in C, C#, C++ etc but you can use a compiler to convert it to assembly if you didnt know. Usually people who learn these languages also know how assembly works.

<edited>

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Well, I don't recall much about assembly, since I barely spent any time with it, but it won't matter.

That kind of language isn't up to our board's standards, so you will soon be booted off the forum.

Quote:

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Originally Posted by bawse.c

I posted this on a C forum because its easy to implement this in C, C#, C++ etc but you can use a compiler to convert it to assembly if you didnt know.

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Obviously, you can use a compiler to convert C code to assembly, since most C compilers do that as an intermediate step. However, your question is really about MIPS, not C, regardless of how easy it is to implement in C.

If you had provided the requisite C code that you were trying to convert and posted your best attempt, then perhaps your thread would be marginally on topic, but as it is, this whole thread is off topic.

Furthermore, your behaviour in this thread is against the forum rules. Hence, consider this an official warning.

*thread closed*