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# 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
##############################################################################
macro(add_vpp_march_variant v)
cmake_parse_arguments(ARG
"OFF"
"N_PREFETCHES"
"FLAGS"
${ARGN}
)
if(ARG_FLAGS)
set(flags_ok 1)
set(fs "")
foreach(f ${ARG_FLAGS})
string(APPEND fs " ${f}")
string(REGEX REPLACE "[-=+]" "_" sfx ${f})
if(NOT DEFINED compiler_flag${sfx})
check_c_compiler_flag(${f} compiler_flag${sfx})
endif()
if(NOT compiler_flag${sfx})
unset(flags_ok)
endif()
endforeach()
if(ARG_N_PREFETCHES)
string(APPEND fs " -DCLIB_N_PREFETCHES=${ARG_N_PREFETCHES}")
endif()
if(flags_ok)
string(TOUPPER ${v} uv)
if(ARG_OFF)
option(VPP_MARCH_VARIANT_${uv} "Build ${v} multiarch variant." OFF)
else()
option(VPP_MARCH_VARIANT_${uv} "Build ${v} multiarch variant." ON)
endif()
if (VPP_MARCH_VARIANT_${uv})
list(APPEND MARCH_VARIANTS "${v}\;${fs}")
else()
list(APPEND MARCH_VARIANTS_DISABLED "${v}\;${fs}")
endif()
endif()
endif()
endmacro()
if(CMAKE_SYSTEM_PROCESSOR MATCHES "amd64.*|x86_64.*|AMD64.*")
set(VPP_DEFAULT_MARCH_FLAGS -march=corei7 -mtune=corei7-avx)
add_vpp_march_variant(hsw
FLAGS -march=haswell -mtune=haswell
)
add_vpp_march_variant(trm
FLAGS -march=tremont -mtune=tremont
OFF
)
if (GNU_ASSEMBLER_AVX512_BUG)
message(WARNING "AVX-512 multiarch variant(s) disabled due to GNU Assembler bug")
else()
add_vpp_march_variant(skx
FLAGS -march=skylake-avx512 -mtune=skylake-avx512 -mprefer-vector-width=256
)
add_vpp_march_variant(icl
FLAGS -march=icelake-client -mtune=icelake-client -mprefer-vector-width=512
)
endif()
elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(aarch64.*|AARCH64.*)")
set(VPP_DEFAULT_MARCH_FLAGS -march=armv8-a+crc)
add_vpp_march_variant(qdf24xx
FLAGS -march=armv8-a+crc+crypto -mtune=qdf24xx
N_PREFETCHES 8
OFF
)
add_vpp_march_variant(octeontx2
FLAGS -march=armv8.2-a+crc+crypto+lse
N_PREFETCHES 8
)
add_vpp_march_variant(thunderx2t99
FLAGS -march=armv8.1-a+crc+crypto -mtune=thunderx2t99
N_PREFETCHES 8
)
add_vpp_march_variant(cortexa72
FLAGS -march=armv8-a+crc+crypto -mtune=cortex-a72
N_PREFETCHES 6
)
add_vpp_march_variant(neoversen1
FLAGS -march=armv8.2-a+crc+crypto -mtune=neoverse-n1
N_PREFETCHES 6
)
endif()
macro(vpp_library_set_multiarch_sources lib)
cmake_parse_arguments(ARG
""
""
"SOURCES;DEPENDS;FORCE_ON"
${ARGN}
)
set(VARIANTS "${MARCH_VARIANTS}")
if(ARG_FORCE_ON)
foreach(F ${ARG_FORCE_ON})
foreach(V ${MARCH_VARIANTS_DISABLED})
list(GET V 0 VARIANT)
if (VARIANT STREQUAL F)
list(GET V 1 VARIANT_FLAGS)
list(APPEND VARIANTS "${VARIANT}\;${VARIANT_FLAGS}")
endif()
endforeach()
endforeach()
endif()
foreach(V ${VARIANTS})
list(GET V 0 VARIANT)
list(GET V 1 VARIANT_FLAGS)
set(l ${lib}_${VARIANT})
add_library(${l} OBJECT ${ARG_SOURCES})
if(ARG_DEPENDS)
add_dependencies(${l} ${ARG_DEPENDS})
endif()
set_target_properties(${l} PROPERTIES POSITION_INDEPENDENT_CODE ON)
target_compile_definitions(${l} PUBLIC CLIB_MARCH_VARIANT=${VARIANT})
separate_arguments(VARIANT_FLAGS)
target_compile_options(${l} PUBLIC ${VARIANT_FLAGS})
target_sources(${lib} PRIVATE $<TARGET_OBJECTS:${l}>)
endforeach()
endmacro()
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