5ed60ffd79
Adds two new CMake functions to query the host system: * `check_hwcap`, * `check_emulator`. Together, these functions are used to check whether a given set of MLIR integration tests require an emulator. If yes, then the corresponding CMake var that defies the required emulator executable is also checked. `check_hwcap` relies on ELF_HWCAP for discovering CPU features from userspace on Linux systems. This is the recommended approach for Arm CPUs running on Linux as outlined in this blog post: * https://community.arm.com/arm-community-blogs/b/operating-systems-blog/posts/runtime-detection-of-cpu-features-on-an-armv8-a-cpu Other operating systems (e.g. Android) and CPU architectures will most likely require some other approach. Right now these new hooks are only used for SVE and SME integration tests. This relands #86489 with the following changes: * Replaced: `set(hwcap_test_file ${CMAKE_BINARY_DIR}/${CMAKE_FILES_DIRECTORY}/hwcap_check.c)` with: `set(hwcap_test_file ${CMAKE_BINARY_DIR}/temp/hwcap_check.c)` The former would trigger an infinite loop when running `ninja` (after the initial CMake configuration). * Fixed commit msg. Previous one was taken from the initial GH PR commit rather than the final re-worked solution (missed this when merging via GH UI). * A couple more NFCs/tweaks.
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'ArmSME' Dialect
Basic dialect to target Arm SME.
This dialect defines custom and LLVM IR intrinsic operations that are used to target Arm Scalable Matrix Extension. Through the available conversion and ArmSME passes you can, for example, lower a linalg.matmul operation to Arm SME FMOPA (floating-point outer product) operations. See one of the in-tree end-to-end integration tests for reference:
In order to run ArmSME integration tests, include these flags in the CMake invocation when configuring LLVM and MLIR:
-DMLIR_INCLUDE_INTEGRATION_TESTS=On
-DMLIR_RUN_ARM_SME_TESTS=On
-DARM_EMULATOR_EXECUTABLE=<path-to-emulator>
These tests are run "post-commit" by the clang-aarch64-sve-vla LLVM BuildBot worker.
References:
[TOC]
Operations
[include "Dialects/ArmSMEOps.md"]
Operations for LLVM IR Intrinsics
[include "Dialects/ArmSMEIntrinsicOps.md"]