aboutsummaryrefslogtreecommitdiffstats
path: root/src/cmake/cpu.cmake
blob: caeccc050cf8d924782446c4d12431a903d67ec8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
# 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}")
      endif()
    endif()
  endif()
endmacro()

if(CMAKE_SYSTEM_PROCESSOR MATCHES "amd64.*|x86_64.*|AMD64.*")
  set(CMAKE_C_FLAGS "-march=corei7 -mtune=corei7-avx ${CMAKE_C_FLAGS}")

  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(CMAKE_C_FLAGS "-march=armv8-a+crc ${CMAKE_C_FLAGS}")

  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"
    ${ARGN}
  )

  foreach(V ${MARCH_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_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()