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add missing file

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This commit is contained in:
Konstantinos Margaritis 2023-10-08 23:54:06 +03:00
parent 24ae1670d6
commit 3884f597d3
1 changed files with 75 additions and 0 deletions
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75
cmake/archdetect.cmake Normal file
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@ -0,0 +1,75 @@
if (USE_CPU_NATIVE)
# Detect best GNUCC_ARCH to tune for
if (CMAKE_COMPILER_IS_GNUCC)
message(STATUS "gcc version ${CMAKE_C_COMPILER_VERSION}")
# If gcc doesn't recognise the host cpu, then mtune=native becomes
# generic, which isn't very good in some cases. march=native looks at
# cpuid info and then chooses the best microarch it can (and replaces
# the flag), so use that for tune.
set(TUNE_FLAG "mtune")
set(GNUCC_TUNE "")
message(STATUS "ARCH_FLAG '${ARCH_FLAG}' '${GNUCC_ARCH}', TUNE_FLAG '${TUNE_FLAG}' '${GNUCC_TUNE}' ")
# arg1 might exist if using ccache
string (STRIP "${CMAKE_C_COMPILER_ARG1}" CC_ARG1)
set (EXEC_ARGS ${CC_ARG1} -c -Q --help=target -${ARCH_FLAG}=native -${TUNE_FLAG}=native)
execute_process(COMMAND ${CMAKE_C_COMPILER} ${EXEC_ARGS}
OUTPUT_VARIABLE _GCC_OUTPUT)
set(_GCC_OUTPUT_TUNE ${_GCC_OUTPUT})
string(FIND "${_GCC_OUTPUT}" "${ARCH_FLAG}=" POS)
string(SUBSTRING "${_GCC_OUTPUT}" ${POS} -1 _GCC_OUTPUT)
string(REGEX REPLACE "${ARCH_FLAG}=[ \t]*([^ \n]*)[ \n].*" "\\1" GNUCC_ARCH "${_GCC_OUTPUT}")
string(FIND "${_GCC_OUTPUT_TUNE}" "${TUNE_FLAG}=" POS_TUNE)
string(SUBSTRING "${_GCC_OUTPUT_TUNE}" ${POS_TUNE} -1 _GCC_OUTPUT_TUNE)
string(REGEX REPLACE "${TUNE_FLAG}=[ \t]*([^ \n]*)[ \n].*" "\\1" GNUCC_TUNE "${_GCC_OUTPUT_TUNE}")
message(STATUS "ARCH_FLAG '${ARCH_FLAG}' '${GNUCC_ARCH}', TUNE_FLAG '${TUNE_FLAG}' '${GNUCC_TUNE}' ")
# test the parsed flag
set (EXEC_ARGS ${CC_ARG1} -E - -${ARCH_FLAG}=${GNUCC_ARCH} -${TUNE_FLAG}=${GNUCC_TUNE})
execute_process(COMMAND ${CMAKE_C_COMPILER} ${EXEC_ARGS}
OUTPUT_QUIET ERROR_QUIET
INPUT_FILE /dev/null
RESULT_VARIABLE GNUCC_TUNE_TEST)
if (NOT GNUCC_TUNE_TEST EQUAL 0)
message(WARNING "Something went wrong determining gcc tune: -mtune=${GNUCC_TUNE} not valid, falling back to -mtune=native")
set(GNUCC_TUNE native)
else()
set(GNUCC_TUNE ${GNUCC_TUNE})
message(STATUS "gcc will tune for ${GNUCC_ARCH}, ${GNUCC_TUNE}")
endif()
elseif (CMAKE_COMPILER_IS_CLANG)
if (ARCH_IA32 OR ARCH_X86_64)
set(GNUCC_ARCH native)
set(TUNE_FLAG generic)
elseif(ARCH_AARCH64)
set(GNUCC_ARCH armv8)
set(TUNE_FLAG generic)
elseif(ARCH_ARM32)
set(GNUCC_ARCH armv7a)
set(TUNE_FLAG generic)
else()
set(GNUCC_ARCH native)
set(TUNE_FLAG generic)
endif()
message(STATUS "clang will tune for ${GNUCC_ARCH}, ${TUNE_FLAG}")
endif()
else()
if (ARCH_IA32 OR ARCH_X86_64)
set(GNUCC_ARCH generic)
set(TUNE_FLAG generic)
elseif(ARCH_AARCH64)
set(GNUCC_ARCH armv8-a)
set(TUNE_FLAG generic)
elseif(ARCH_ARM32)
set(GNUCC_ARCH armv7a)
set(TUNE_FLAG generic)
else()
set(GNUCC_ARCH generic)
set(TUNE_FLAG generic)
endif()
endif()