Revert "[mlir][test] Make SME e2e tests require an emulator (#86489)"

This reverts commit 7b5255297dca377a37c8df066e9d9749ab96cfad.

Broken bot:
* https://lab.llvm.org/buildbot/#/builders/179/builds/9794

mlir/cmake/modules/MLIRCheckHardwareFeatures.cmake

@@ -1,101 +0,0 @@
-# A collection of helper CMake functions to detect hardware capabilities. At
-# the moment these are used when configuring MLIR integration tests.
-
-# Checks whether the specified hardware capability is supported by the host
-# Linux system. This is implemented by checking auxiliary vector feature
-# provided by the Linux kernel.
-#
-# check_hwcap(
-#   hwcap_spec
-#   output_var
-# )
-#
-# hwcap_spec - HWCAP value to check - these are defined in hwcap.h in the Linux
-#              kernel.
-#
-# output_var - Output variable to use to save the results (TRUE for supported,
-#              FALSE for not supported).
-#
-# EXAMPLES:
-#
-# check_hwcap("HWCAP2_SME" SME_EMULATOR_REQUIRED)
-#
-function(check_hwcap hwcap_spec output)
-    set(hwcap_test_src
-      [====[
-      #include <asm/hwcap.h>
-      #include <sys/auxv.h>
-
-      int main(void)
-      {
-          long hwcaps = getauxval(AT_<HWCAP_VEC>);
-          return (hwcaps & <HWCAP_SPEC>) != 0;
-      }
-      ]====]
-    )
-
-    # Extract from $hwcap_spec whether this is AT_HWCAP or AT_HWCAP2
-    string(FIND ${hwcap_spec} "_" wsloc)
-    string(SUBSTRING ${hwcap_spec} 0 ${wsloc} hwcap_vec)
-
-    string(REPLACE "<HWCAP_VEC>" ${hwcap_vec} hwcap_test_src "${hwcap_test_src}")
-    string(REPLACE "<HWCAP_SPEC>" ${hwcap_spec} hwcap_test_src "${hwcap_test_src}")
-
-    set(hwcap_test_file ${CMAKE_BINARY_DIR}/${CMAKE_FILES_DIRECTORY}/hwcap_check.c)
-    file(WRITE ${hwcap_test_file} "${hwcap_test_src}")
-
-    # Compile _and_ run
-    try_run(
-        test_run_result test_compile_result
-        ${CMAKE_BINARY_DIR}
-        ${hwcap_test_file}
-    )
-    # Compilation will fail if hwcap_spec is not defined - this usually means
-    # that your Linux kernel is too old.
-    if(${test_compile_result} AND (DEFINED test_run_result))
-      message(${test_run_result})
-      message(STATUS "Checking whether ${hwcap_spec} is supported by the host system: ${test_run_result}")
-      set(${output} ${test_run_result} PARENT_SCOPE)
-    else()
-      message(STATUS "Checking whether ${hwcap_spec} is supported by the host system: FALSE")
-    endif()
-endfunction(check_hwcap)
-
-# For the given group of e2e tests (defined by the `mlir_e2e_tests` flag),
-# checks whether an emulator is required. If yes, verifies that the
-# corresponding CMake var pointing to an emulator (`emulator_exec`) has been
-# set.
-#
-# check_emulator(
-#   mlir_e2e_tests
-#   hwcap_spec
-#   emulator_exec
-# )
-#
-# mlir_e2e_tests  - MLIR CMake variables corresponding to the group of e2e tests
-#                   to check
-# hwcap_spec      - HWCAP value to check. This should correspond to the hardware
-#                   capabilities required by the tests to be checked. Possible
-#                   values are defined in hwcap.h in the Linux kernel.
-# emulator_exec   - variable the defines the emulator (ought to be set if
-#                   required, can be empty otherwise).
-#
-# EXAMPLES:
-#
-#  check_emulator(MLIR_RUN_ARM_SVE_TESTS "HWCAP_SVE" ARM_EMULATOR_EXECUTABLE)
-#
-function(check_emulator mlir_e2e_tests hwcap_spec emulator_exec)
-  if (NOT ${mlir_e2e_tests})
-    return()
-  endif()
-
-  check_hwcap(${hwcap_spec} emulator_not_required)
-  if (${emulator_not_required})
-    return()
-  endif()
-
-  if (${emulator_exec} STREQUAL "")
-    message(FATAL_ERROR "${mlir_e2e_tests} requires an emulator, but ${emulator_exec} is not set")
-  endif()
-
-endfunction()

mlir/docs/Dialects/ArmSME.md

@@ -6,7 +6,7 @@ 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](https://mlir.llvm.org/docs/Dialects/Linalg/#linalgmatmul-linalgmatmulop)
-operation to Arm SME
+opereation to Arm SME
 [FMOPA](https://developer.arm.com/documentation/ddi0602/2023-03/SME-Instructions/FMOPA--widening---Half-precision-floating-point-sum-of-outer-products-and-accumulate-)
 (floating-point outer product) operations. See one of the in-tree end-to-end
 integration tests for reference:
@@ -14,14 +14,6 @@ integration tests for reference:
 * [Linalg/CPU/ArmSME/matmul.mlir](https://github.com/llvm/llvm-project/blob/main/mlir/test/Integration/Dialect/Linalg/CPU/ArmSME/matmul.mlir)
 * [Vector/CPU/ArmSME/test-outerproduct-f64.mlir](https://github.com/llvm/llvm-project/blob/main/mlir/test/Integration/Dialect/Vector/CPU/ArmSME/test-outerproduct-f64.mlir)
 
-In order to run ArmSME integration tests, include these flags in the CMake
-invocation when configuring LLVM and MLIR:
-```bash
-  -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](https://lab.llvm.org/buildbot/#/builders/197) LLVM
 BuildBot worker.

mlir/test/CMakeLists.txt

@@ -1,5 +1,3 @@
-include(MLIRCheckHardwareFeatures)
-
 add_subdirectory(CAPI)
 add_subdirectory(lib)
 
@@ -41,10 +39,6 @@ if (MLIR_INCLUDE_INTEGRATION_TESTS)
   option(MLIR_RUN_ARM_SVE_TESTS "Run Arm SVE tests.")
   option(MLIR_RUN_ARM_SME_TESTS "Run Arm SME tests.")
 
-  # Check whether an emulator is required - if yes then make sure that it's
-  # been set.
-  check_emulator(MLIR_RUN_ARM_SVE_TESTS "HWCAP_SVE" ARM_EMULATOR_EXECUTABLE)
-  check_emulator(MLIR_RUN_ARM_SME_TESTS "HWCAP2_SME" ARM_EMULATOR_EXECUTABLE)
 
   # The native target may not be enabled when cross compiling, raise an error.
   if(NOT MLIR_ENABLE_EXECUTION_ENGINE)