December 2015
Beginner to intermediate
166 pages
3h 8m
English
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Getting the address of an element
In LLVM, the getelementptr instruction is used to get the address of an element in an aggregate data structure. It only calculates the address and does not access the memory.
The first argument of the getelementptr instruction is a type used as the basis for calculating the address. The second argument is pointer or vector of pointers which act as base of the address - which in our array case will be a. The next arguments are the indices of the element to be accessed.
The Language reference (http://llvm.org/docs/LangRef.html#getelementptr-instruction) mentions important notes on getelementptr instruction as follows:
The first index always indexes the pointer value given as the first argument, the second index indexes ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.