May 2015
Intermediate to advanced
296 pages
5h 10m
English
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Legalizing SelectionDAG
A SelectionDAG representation is a target-independent representation of instructions and operands. However, a target may not always support the instruction or data type represented by SelectionDAG. In that sense, the initial SelectionDAG graph constructed can be called illegal. The DAG legalize phase converts the illegal DAG into a legal DAG supported by the target architecture.
A DAG legalize phase can follow two ways to convert unsupported data types into supported data types—by promoting smaller data types to larger data types, or by truncating larger data types into smaller ones. For example, suppose that a type of target architecture supports only i32 data types. In that case, smaller data types such as i8 and i16 need ...
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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.