2024 EuroLLVM - Faster Compilation with GlobalISel: Skipping LLVM-IR

2024 European LLVM Developers' Meeting
llvm.org/devmt...
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Faster Compilation with GlobalISel: Skipping LLVM-IR
Speaker:
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Slides: llvm.org/devmt...
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In a GlobalISel-based back-end, LLVM-IR is first translated to generic Machine IR (gMIR), which is then selected into target instructions. Instead of generating LLVM-IR, we emit gMIR directly and skip the first part of the code generation pipeline. For our application, this improved compile-times by ~20%. In this talk, we present how to work with gMIR, show how common IR constructs are lowered for GlobalISel, and discuss the performance of LLVM's instruction selectors.
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Videos Edited by Bash Films: www.BashFilms.com