# Copyright (c) 2018 Cisco and/or its affiliates.
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at:
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
##############################################################################
# Cache line size detection
##############################################################################
if(CMAKE_CROSSCOMPILING)
message(STATUS "Cross-compiling - cache line size detection disabled")
set(VPP_LOG2_CACHE_LINE_SIZE 6)
elseif(DEFINED VPP_LOG2_CACHE_LINE_SIZE)
# Cache line size assigned via cmake args
elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(aarch64.*|AARCH64.*)")
file(READ "/proc/cpuinfo" cpuinfo)
string(REPLACE "\n" ";" cpuinfo ${cpuinfo})
foreach(l ${cpuinfo})
string(REPLACE ":" ";" l ${l})
list(GET l 0 name)
list(GET l 1 value)
string(STRIP ${name} name)
string(STRIP ${value} value)
if(${name} STREQUAL "CPU implementer")
set(CPU_IMPLEMENTER ${value})
endif()
if(${name} STREQUAL "CPU part")
set(CPU_PART ${value})
endif()
endforeach()
# Implementer 0x43 - Cavium
# Part 0x0af - ThunderX2 is 64B, rest all are 128B
if (${CPU_IMPLEMENTER} STREQUAL "0x43")
if (${CPU_PART} STREQUAL "0x0af")
set(VPP_LOG2_CACHE_LINE_SIZE 6)
else()
set(VPP_LOG2_CACHE_LINE_SIZE 7)
endif()
else()
set(VPP_LOG2_CACHE_LINE_SIZE 6)
endif()
math(EXPR VPP_CACHE_LINE_SIZE "1 << ${VPP_LOG2_CACHE_LINE_SIZE}")
message(STATUS "ARM AArch64 CPU implementer ${CPU_IMPLEMENTER} part ${CPU_PART} cacheline size ${VPP_CACHE_LINE_SIZE}")
else()
set(VPP_LOG2_CACHE_LINE_SIZE 6)
endif()
set(VPP_LOG2_CACHE_LINE_SIZE ${VPP_LOG2_CACHE_LINE_SIZE}
CACHE STRING "Target CPU cache line size (power of 2)")
##############################################################################
# Gnu Assembler AVX-512 bug detection
# - see: https://sourceware.org/bugzilla/show_bug.cgi?id=23465
##############################################################################
if(CMAKE_SYSTEM_PROCESSOR MATCHES "amd64.*|x86_64.*|AMD64.*")
if (CMAKE_C_COMPILER_ID STREQUAL "GNU")
set(pfx ${CMAKE_CURRENT_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/gas_avx512_bug_test)
file(WRITE ${pfx}.s "vmovaps 0x40(,%rax), %zmm0\n")
execute_process(COMMAND ${CMAKE_C_COMPILER} -c ${pfx}.s -o ${pfx}.o)
execute_process(COMMAND objdump -s ${pfx}.o OUTPUT_VARIABLE _output)
if (NOT _output MATCHES "62f17c48 28040540 000000")
set(GNU_ASSEMBLER_AVX512_BUG 1)
endif()
endif()
endif()
##############################################################################
# CPU optimizations and multiarch support
##############################################################################
if(CMAKE_SYSTEM_PROCESSOR MATCHES "amd64.*|x86_64.*|AMD64.*")
set(CMAKE_C_FLAGS "-march=corei7 -mtune=corei7-avx ${CMAKE_C_FLAGS}")
check_c_compiler_flag("-march=haswell" compiler_flag_march_haswell)
if(compiler_flag_march_haswell)
list(APPEND MARCH_VARIANTS "hsw\;-march=haswell -mtune=haswell")
endif()
if (GNU_ASSEMBLER_AVX512_BUG)
message(WARNING "AVX-512 multiarch variant(s) disabled due to GNU Assembler bug")
else()
check_c_compiler_flag("-mprefer-vector-width=256" compiler_flag_mprefer_vector_width)
check_c_compiler_flag("-march=skylake-avx512" compiler_flag_march_skylake_avx512)
check_c_compiler_flag("-march=icelake-client" compiler_flag_march_icelake_client)
if(compiler_flag_march_skylake_avx512 AND compiler_flag_mprefer_vector_width)
list(APPEND MARCH_VARIANTS "skx\;-march=skylake-avx512 -mtune=skylake-avx512 -mprefer-vector-width=256")
endif()
if(compiler_flag_march_icelake_client AND compiler_flag_mprefer_vector_width)
list(APPEND MARCH_VARIANTS "icl\;-march=icelake-client -mtune=icelake-client -mprefer-vector-width=512")
endif()
endif()
elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(aarch64.*|AARCH64.*)")
set(CMAKE_C_FLAGS "-march=armv8-a+crc ${CMAKE_C_FLAGS}")
check_c_compiler_flag("-march=armv8-a+crc+crypto -mtune=qdf24xx" compiler_flag_march_core_qdf24xx)
if(compiler_flag_march_core_qdf24xx)
list(APPEND MARCH_VARIANTS "qdf24xx\;-march=armv8-a+crc+crypto -DCLIB_N_PREFETCHES=8")
endif()
check_c_compiler_flag("-march=armv8.2-a+crc+crypto+lse" compiler_flag_march_core_octeontx2)
if(compiler_flag_march_core_octeontx2)
list(APPEND MARCH_VARIANTS "octeontx2\;-march=armv8.2-a+crc+crypto+lse -DCLIB_N_PREFETCHES=8")
endif()
check_c_compiler_flag("-march=armv8.1-a+crc+crypto -mtune=thunderx2t99" compiler_flag_march_thunderx2t99)
if(compiler_flag_march_thunderx2t99)
if (CMAKE_C_COMPILER_ID STREQUAL "GNU" AND (NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 8.3))
list(APPEND MARCH_VARIANTS "thunderx2t99\;-march=armv8.1-a+crc+crypto -mtune=thunderx2t99 -DCLIB_N_PREFETCHES=8")
else()
list(APPEND MARCH_VARIANTS "thunderx2t99\;-march=armv8.1-a+crc+crypto -DCLIB_N_PREFETCHES=8")
endif()
endif()
check_c_compiler_flag("-march=armv8-a+crc+crypto -mtune=cortex-a72" compiler_flag_march_cortexa72)
if(compiler_flag_march_cortexa72)
list(APPEND MARCH_VARIANTS "cortexa72\;-march=armv8-a+crc+crypto -mtune=cortex-a72 -DCLIB_N_PREFETCHES=6")
endif()
check_c_compiler_flag("-march=armv8.2-a+crc+crypto -mtune=neoverse-n1" compiler_flag_march_neoversen1)
if(compiler_flag_march_neoversen1)
list(APPEND MARCH_VARIANTS "neoversen1\;-march=armv8.2-a+crc+crypto -mtune=neoverse-n1 -DCLIB_N_PREFETCHES=6")
endif()
endif()
macro(vpp_library_set_multiarch_sources lib deps)
foreach(V ${MARCH_VARIANTS})
list(GET V 0 VARIANT)
list(GET V 1 VARIANT_FLAGS)
set(l ${lib}_${VARIANT})
add_library(${l} OBJECT ${ARGN})
if("${deps}")
add_dependencies(${l} ${deps})
endif()
set_target_properties(${l} PROPERTIES POSITION_INDEPENDENT_CODE ON)
target_compile_options(${l} PUBLIC "-DCLIB_MARCH_VARIANT=${VARIANT}")
separate_arguments(VARIANT_FLAGS)
target_compile_options(${l} PUBLIC ${VARIANT_FLAGS})
target_sources(${lib} PRIVATE $<TARGET_OBJECTS:${l}>)
endforeach()
endmacro()
Florin Coras