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https://github.com/VectorCamp/vectorscan.git
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5515fbbd48
Prevents overwriting GNUCC_ARCH with an empty value when parsing output of gcc -Q --help=target. Ensures robustness if detection fails and returns an empty string. Signed-off-by: Ibrahim Kashif <ibrahim.kashif@arm.com>
125 lines
4.6 KiB
CMake
125 lines
4.6 KiB
CMake
if (USE_CPU_NATIVE)
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# Detect best GNUCC_ARCH to tune for
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if (CMAKE_COMPILER_IS_GNUCC)
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message(STATUS "gcc version ${CMAKE_C_COMPILER_VERSION}")
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# If gcc doesn't recognise the host cpu, then mtune=native becomes
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# generic, which isn't very good in some cases. march=native looks at
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# cpuid info and then chooses the best microarch it can (and replaces
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# the flag), so use that for tune.
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set(TUNE_FLAG "mtune")
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# set the default fallback values for the arch and tune to native, in case we can't parse them properly later
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set(GNUCC_ARCH "native")
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set(GNUCC_TUNE "native")
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message(STATUS "ARCH_FLAG '${ARCH_FLAG}' '${GNUCC_ARCH}', TUNE_FLAG '${TUNE_FLAG}' '${GNUCC_TUNE}' ")
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# arg1 might exist if using ccache
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string (STRIP "${CMAKE_C_COMPILER_ARG1}" CC_ARG1)
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set (EXEC_ARGS ${CC_ARG1} -c -Q --help=target -${ARCH_FLAG}=${GNUCC_ARCH} -${TUNE_FLAG}=${GNUCC_TUNE})
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execute_process(COMMAND ${CMAKE_C_COMPILER} ${EXEC_ARGS}
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OUTPUT_VARIABLE _GCC_OUTPUT)
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set(_GCC_OUTPUT_TUNE ${_GCC_OUTPUT})
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string(FIND "${_GCC_OUTPUT}" "${ARCH_FLAG}=" POS)
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string(SUBSTRING "${_GCC_OUTPUT}" ${POS} -1 _GCC_OUTPUT)
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string(REGEX REPLACE "${ARCH_FLAG}=[ \t]*([^ \n]*)[ \n].*" "\\1" _GNUCC_ARCH "${_GCC_OUTPUT}")
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# Only overwrite arch if non-empty
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if(NOT _GNUCC_ARCH STREQUAL "")
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set(GNUCC_ARCH ${_GNUCC_ARCH})
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endif()
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string(FIND "${_GCC_OUTPUT_TUNE}" "${TUNE_FLAG}=" POS_TUNE)
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string(SUBSTRING "${_GCC_OUTPUT_TUNE}" ${POS_TUNE} -1 _GCC_OUTPUT_TUNE)
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string(REGEX REPLACE "${TUNE_FLAG}=[ \t]*([^ \n]*)[ \n].*" "\\1" _GNUCC_TUNE "${_GCC_OUTPUT_TUNE}")
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# Only overwrite tune if non-empty
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if (NOT _GNUCC_TUNE STREQUAL "")
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set(GNUCC_TUNE ${_GNUCC_TUNE})
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endif()
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message(STATUS "ARCH_FLAG '${ARCH_FLAG}' '${GNUCC_ARCH}', TUNE_FLAG '${TUNE_FLAG}' '${GNUCC_TUNE}' ")
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# test the parsed flag
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set (EXEC_ARGS ${CC_ARG1} -E - -${ARCH_FLAG}=${GNUCC_ARCH} -${TUNE_FLAG}=${GNUCC_TUNE})
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execute_process(COMMAND ${CMAKE_C_COMPILER} ${EXEC_ARGS}
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OUTPUT_QUIET ERROR_QUIET
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INPUT_FILE /dev/null
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RESULT_VARIABLE GNUCC_TUNE_TEST)
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if (NOT GNUCC_TUNE_TEST EQUAL 0)
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message(WARNING "Something went wrong determining gcc tune: -mtune=${GNUCC_TUNE} not valid, falling back to -mtune=native")
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set(GNUCC_TUNE native)
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else()
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set(GNUCC_TUNE ${GNUCC_TUNE})
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message(STATUS "gcc will tune for ${GNUCC_ARCH}, ${GNUCC_TUNE}")
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endif()
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elseif (CMAKE_COMPILER_IS_CLANG)
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if (ARCH_IA32 OR ARCH_X86_64)
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set(GNUCC_ARCH x86-64-v2)
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set(TUNE_FLAG generic)
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elseif(ARCH_AARCH64)
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if (BUILD_SVE2_BITPERM)
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set(GNUCC_ARCH ${SVE2_BITPERM_ARCH})
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elseif (BUILD_SVE2)
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set(GNUCC_ARCH ${SVE2_ARCH})
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elseif (BUILD_SVE)
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set(GNUCC_ARCH ${SVE_ARCH})
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else ()
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set(GNUCC_ARCH ${ARMV8_ARCH})
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endif()
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set(TUNE_FLAG generic)
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elseif(ARCH_ARM32)
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set(GNUCC_ARCH armv7a)
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set(TUNE_FLAG generic)
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else()
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set(GNUCC_ARCH native)
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set(TUNE_FLAG generic)
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endif()
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message(STATUS "clang will tune for ${GNUCC_ARCH}, ${TUNE_FLAG}")
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endif()
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else()
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if (SIMDE_BACKEND)
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if (ARCH_IA32 OR ARCH_X86_64)
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set(GNUCC_ARCH x86-64-v2)
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set(TUNE_FLAG generic)
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elseif(ARCH_AARCH64)
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set(GNUCC_ARCH armv8-a)
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set(TUNE_FLAG generic)
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elseif(ARCH_ARM32)
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set(GNUCC_ARCH armv7a)
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set(TUNE_FLAG generic)
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elseif(ARCH_PPC64EL)
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set(GNUCC_ARCH power8)
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set(TUNE_FLAG power8)
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else()
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set(GNUCC_ARCH x86-64-v2)
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set(TUNE_FLAG generic)
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endif()
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elseif (ARCH_IA32 OR ARCH_X86_64)
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set(GNUCC_ARCH ${X86_ARCH})
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set(TUNE_FLAG generic)
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elseif(ARCH_AARCH64)
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if (BUILD_SVE2_BITPERM)
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set(GNUCC_ARCH ${SVE2_BITPERM_ARCH})
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elseif (BUILD_SVE2)
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set(GNUCC_ARCH ${SVE2_ARCH})
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elseif (BUILD_SVE)
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set(GNUCC_ARCH ${SVE_ARCH})
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else ()
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set(GNUCC_ARCH ${ARMV8_ARCH})
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endif()
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set(TUNE_FLAG generic)
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elseif(ARCH_ARM32)
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set(GNUCC_ARCH armv7a)
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set(TUNE_FLAG generic)
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elseif(ARCH_PPC64EL)
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set(GNUCC_ARCH power8)
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set(TUNE_FLAG power8)
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else()
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set(GNUCC_ARCH native)
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set(TUNE_FLAG native)
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endif()
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endif()
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