2019 EuroLLVM Developers’ Meeting: V. Bridgers & F. Piovezan “LLVM IR Tutorial - Phis, GEPs ...”

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LLVM IR Tutorial - Phis, GEPs and other things, oh my! - Vince Bridgers (Intel Corporation), Felipe de Azevedo Piovezan (Intel Corporation)

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LLVM intermediate representation (IR) is the abstract description machine operations used to translate LLVM front ends to a form that's executable by a target machine. Optimizations and transformations are performed on the IR by the LLVM library to create executable images. This tutorial will introduce the IR syntax, describe basic tools for manipulating IR formats, and describe mappings of IR from various common source code control structures. Tutorial materials with specific examples will be made available for the tutorial presentation, and for offline review.
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[miguelmuscat]

This is a big help. The lang ref and docs are kind of scary when you have no background info.
Now I feel like I can go in and read them with a lot less confusion. Thanks!

[Jan_Jan_]

Always find myself coming back to this talk. It's clear and concise! 👍

[eopXD]

The presentation is well-designed for beginners.
Thank you for the tutorial!

[higuoxing]

Nice tutorial, but it seems that there's a small mistake in the example (13:20):
recursive_base should be
```
recursive_base:
%1 = add i32 -1, %val
%2 = call i32 @factorial(i32 %1)
%3 = mul i32 %val, %2
ret i32 %3
```

[hampus]

Probably the best talk on this channel

[osdtconf]

Thank. This is very helpful. Excellent tutorial.

[omerguzel]

Nice and clear explaination. Thank you.

[jortz]

This is great. I have to write a small IR compiler(while having no idea what LLVM IR is) and this was of great help.

[abuyoyo]

Is any of this changed by LLVM opaque pointers?

[apivovarov]

кто по ссылке from Konstantin Vladimirov?

[KeithMakank]

13:24 haha the IR is wrong, its supposed to return %3 not %2