eb206e9ea8
With the removal of mlir-vulkan-runner (as part of #73457) in e7e3c45bc70904e24e2b3221ac8521e67eb84668, mlir-cpu-runner is now the only runner for all CPU and GPU targets, and the "cpu" name has been misleading for some time already. This commit renames it to mlir-runner.
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MLIR Release Notes
This document tries to provide some context about MLIR important changes in the context of LLVM releases. It is updated on a best effort basis.
At the moment the MLIR community does not qualify the LLVM release branch specifically, it is a snapshot of the MLIR development at the time of the release.
[TOC]
LLVM 20
All the MLIR runners other than mlir-cpu-runner have been removed, as their functionality has been merged into it, and it has been renamed to mlir-runner.
LLVM 18
Properties: beyond attributes
See LLVM 17 notes below. The Dialect option let usePropertiesForAttributes = 1; is
now the default. You can set it to 0 to revert to the previous behavior. This will be
removed in LLVM 19.
LLVM 17
See also the deprecations and refactoring doc.
Bytecode
MLIR now support a bytecode serialization with versionning compatibility allowing 2 ways compatibility scheme, and lazy-loading capabilities.
Properties: beyond attributes
This is a new mechanism to implement storage for operations without having to
use attributes. You can opt-in to use Properties for ODS inherent attributes
using let usePropertiesForAttributes = 1; in your dialect definition (the flag
will be default in the next release). See
slides and
recording of the open meeting presentation for
details.
Action: Tracing and Debugging MLIR-based Compilers
Action is a new mechanism to encapsulate any transformation of any granularity in a way that can be intercepted by the framework for debugging or tracing purposes, including skipping a transformation programmatically (think about “compiler fuel” or “debug counters” in LLVM). As such, “executing a pass” is an Action, so is “try to apply one canonicalization pattern”, or “tile this loop”.
slides and recording of the open meeting presentation for details.
Transform Dialect
See this EuroLLVM talk and the online tutorial.
Others
- There is now support for "distinct attributes".
- "Resources" (a way to store data outside the MLIR context) and "configuration" can now be serialized alongside the IR.