1 # Copyright (c) 2018 Cisco and/or its affiliates.
2 # Licensed under the Apache License, Version 2.0 (the "License");
3 # you may not use this file except in compliance with the License.
4 # You may obtain a copy of the License at:
6 # http://www.apache.org/licenses/LICENSE-2.0
8 # Unless required by applicable law or agreed to in writing, software
9 # distributed under the License is distributed on an "AS IS" BASIS,
10 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
11 # See the License for the specific language governing permissions and
12 # limitations under the License.
14 ##############################################################################
15 # Cache line size detection
16 ##############################################################################
17 if(CMAKE_CROSSCOMPILING)
18 message(STATUS "Cross-compiling - cache line size detection disabled")
19 set(VPP_LOG2_CACHE_LINE_SIZE 6)
20 elseif(DEFINED VPP_LOG2_CACHE_LINE_SIZE)
21 # Cache line size assigned via cmake args
22 elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(aarch64.*|AARCH64.*)")
23 file(READ "/proc/cpuinfo" cpuinfo)
24 string(REPLACE "\n" ";" cpuinfo ${cpuinfo})
26 string(REPLACE ":" ";" l ${l})
29 string(STRIP ${name} name)
30 string(STRIP ${value} value)
31 if(${name} STREQUAL "CPU implementer")
32 set(CPU_IMPLEMENTER ${value})
34 if(${name} STREQUAL "CPU part")
35 set(CPU_PART ${value})
38 # Implementer 0x43 - Cavium
39 # Part 0x0af - ThunderX2 is 64B, rest all are 128B
40 if (${CPU_IMPLEMENTER} STREQUAL "0x43")
41 if (${CPU_PART} STREQUAL "0x0af")
42 set(VPP_LOG2_CACHE_LINE_SIZE 6)
44 set(VPP_LOG2_CACHE_LINE_SIZE 7)
47 set(VPP_LOG2_CACHE_LINE_SIZE 6)
49 math(EXPR VPP_CACHE_LINE_SIZE "1 << ${VPP_LOG2_CACHE_LINE_SIZE}")
50 message(STATUS "ARM AArch64 CPU implementer ${CPU_IMPLEMENTER} part ${CPU_PART} cacheline size ${VPP_CACHE_LINE_SIZE}")
52 set(VPP_LOG2_CACHE_LINE_SIZE 6)
55 set(VPP_LOG2_CACHE_LINE_SIZE ${VPP_LOG2_CACHE_LINE_SIZE}
56 CACHE STRING "Target CPU cache line size (power of 2)")
58 ##############################################################################
59 # Gnu Assembler AVX-512 bug detection
60 # - see: https://sourceware.org/bugzilla/show_bug.cgi?id=23465
61 ##############################################################################
62 if(CMAKE_SYSTEM_PROCESSOR MATCHES "amd64.*|x86_64.*|AMD64.*")
63 if (CMAKE_C_COMPILER_ID STREQUAL "GNU")
64 set(pfx ${CMAKE_CURRENT_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/gas_avx512_bug_test)
65 file(WRITE ${pfx}.s "vmovaps 0x40(,%rax), %zmm0\n")
66 execute_process(COMMAND ${CMAKE_C_COMPILER} -c ${pfx}.s -o ${pfx}.o)
67 execute_process(COMMAND objdump -s ${pfx}.o OUTPUT_VARIABLE _output)
68 if (NOT _output MATCHES "62f17c48 28040540 000000")
69 set(GNU_ASSEMBLER_AVX512_BUG 1)
74 ##############################################################################
75 # CPU optimizations and multiarch support
76 ##############################################################################
77 if(CMAKE_SYSTEM_PROCESSOR MATCHES "amd64.*|x86_64.*|AMD64.*")
78 set(CMAKE_C_FLAGS "-march=corei7 -mtune=corei7-avx ${CMAKE_C_FLAGS}")
79 check_c_compiler_flag("-march=haswell" compiler_flag_march_haswell)
80 if(compiler_flag_march_haswell)
81 list(APPEND MARCH_VARIANTS "hsw\;-march=haswell -mtune=haswell")
83 if (GNU_ASSEMBLER_AVX512_BUG)
84 message(WARNING "AVX-512 multiarch variant(s) disabled due to GNU Assembler bug")
86 check_c_compiler_flag("-mprefer-vector-width=256" compiler_flag_mprefer_vector_width)
87 check_c_compiler_flag("-march=skylake-avx512" compiler_flag_march_skylake_avx512)
88 check_c_compiler_flag("-march=icelake-client" compiler_flag_march_icelake_client)
89 if(compiler_flag_march_skylake_avx512 AND compiler_flag_mprefer_vector_width)
90 list(APPEND MARCH_VARIANTS "skx\;-march=skylake-avx512 -mtune=skylake-avx512 -mprefer-vector-width=256")
92 if(compiler_flag_march_icelake_client AND compiler_flag_mprefer_vector_width)
93 list(APPEND MARCH_VARIANTS "icl\;-march=icelake-client -mtune=icelake-client -mprefer-vector-width=512")
96 elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(aarch64.*|AARCH64.*)")
97 set(CMAKE_C_FLAGS "-march=armv8-a+crc ${CMAKE_C_FLAGS}")
98 check_c_compiler_flag("-march=armv8-a+crc+crypto -mtune=qdf24xx" compiler_flag_march_core_qdf24xx)
99 if(compiler_flag_march_core_qdf24xx)
100 list(APPEND MARCH_VARIANTS "qdf24xx\;-march=armv8-a+crc+crypto -DCLIB_N_PREFETCHES=8")
102 check_c_compiler_flag("-march=armv8.1-a+crc+crypto -mtune=thunderx2t99" compiler_flag_march_thunderx2t99)
103 if(compiler_flag_march_thunderx2t99)
104 if (CMAKE_C_COMPILER_ID STREQUAL "GNU" AND (NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 8.3))
105 list(APPEND MARCH_VARIANTS "thunderx2t99\;-march=armv8.1-a+crc+crypto -mtune=thunderx2t99 -DCLIB_N_PREFETCHES=8")
107 list(APPEND MARCH_VARIANTS "thunderx2t99\;-march=armv8.1-a+crc+crypto -DCLIB_N_PREFETCHES=8")
110 check_c_compiler_flag("-march=armv8-a+crc+crypto -mtune=cortex-a72" compiler_flag_march_cortexa72)
111 if(compiler_flag_march_cortexa72)
112 list(APPEND MARCH_VARIANTS "cortexa72\;-march=armv8-a+crc+crypto -mtune=cortex-a72 -DCLIB_N_PREFETCHES=6")
114 check_c_compiler_flag("-march=armv8.2-a+crc+crypto -mtune=neoverse-n1" compiler_flag_march_neoversen1)
115 if(compiler_flag_march_neoversen1)
116 list(APPEND MARCH_VARIANTS "neoversen1\;-march=armv8.2-a+crc+crypto -mtune=neoverse-n1 -DCLIB_N_PREFETCHES=6")
120 macro(vpp_library_set_multiarch_sources lib)
121 foreach(V ${MARCH_VARIANTS})
122 list(GET V 0 VARIANT)
123 list(GET V 1 VARIANT_FLAGS)
124 set(l ${lib}_${VARIANT})
125 add_library(${l} OBJECT ${ARGN})
126 set_target_properties(${l} PROPERTIES POSITION_INDEPENDENT_CODE ON)
127 target_compile_options(${l} PUBLIC "-DCLIB_MARCH_VARIANT=${VARIANT}")
128 separate_arguments(VARIANT_FLAGS)
129 target_compile_options(${l} PUBLIC ${VARIANT_FLAGS})
130 target_sources(${lib} PRIVATE $<TARGET_OBJECTS:${l}>)