| commit | 2c313259c65317f097d57ab4c6684b25db98f2e4 | [log] [tgz] |
|---|---|---|
| author | lialan <xunli@amd.com> | Tue Oct 29 23:04:48 2024 -0400 |
| committer | GitHub <noreply@github.com> | Tue Oct 29 20:04:48 2024 -0700 |
| tree | 3c76c51eb0aa77b8803a710c16862346e9a2c950 | |
| parent | c62130f7b35412e7caadf5fd9547f21a736c4543 [diff] |
[MLIR] VectorEmulateNarrowType to support loading of unaligned vectors (#113411) Previously, the pass only supported emulation of loading vector sizes that are multiples of the emulated data type. This patch expands its support for emulating sizes that are not multiples of byte sizes. In such cases, the element values are packed back-to-back to preserve memory space. To give a concrete example: if an input has type `memref<3x3xi2>`, it is actually occupying 3 bytes in memory, with the first 18 bits storing the values and the last 6 bits as padding. The slice of `vector<3xi2>` at index `[2, 0]` is stored in memory from bit 12 to bit 18. To properly load the elements from bit 12 to bit 18 from memory, first load byte 2 and byte 3, and convert it to a vector of `i2` type; then extract bits 4 to 10 (element index 2-5) to form a `vector<3xi2>`. A limitation of this patch is that the linearized index of the unaligned vector has to be known at compile time. Extra code needs to be emitted to handle it if the condition does not hold. The following ops are updated: * `vector::LoadOp` * `vector::TransferReadOp` * `vector::MaskedLoadOp`
Welcome to the LLVM project!
This repository contains the source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and run-time environments.
The LLVM project has multiple components. The core of the project is itself called “LLVM”. This contains all of the tools, libraries, and header files needed to process intermediate representations and convert them into object files. Tools include an assembler, disassembler, bitcode analyzer, and bitcode optimizer.
C-like languages use the Clang frontend. This component compiles C, C++, Objective-C, and Objective-C++ code into LLVM bitcode -- and from there into object files, using LLVM.
Other components include: the libc++ C++ standard library, the LLD linker, and more.
Consult the Getting Started with LLVM page for information on building and running LLVM.
For information on how to contribute to the LLVM project, please take a look at the Contributing to LLVM guide.
Join the LLVM Discourse forums, Discord chat, LLVM Office Hours or Regular sync-ups.
The LLVM project has adopted a code of conduct for participants to all modes of communication within the project.