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ClickHouse/cmake/cpu_features.cmake
Robert Schulze 9c5017323d
Add comment about bf16 to CMake docs
2024-11-15 11:50:08 +00:00

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CMake
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# https://software.intel.com/sites/landingpage/IntrinsicsGuide/
# The variables HAVE_* determine if compiler has support for the flag to use the corresponding instruction set.
# The options ENABLE_* determine if we will tell compiler to actually use the corresponding instruction set if compiler can do it.
# All of them are unrelated to the instruction set at the host machine
# (you can compile for newer instruction set on old machines and vice versa).
option (ARCH_NATIVE "Add -march=native compiler flag. This makes your binaries non-portable but more performant code may be generated. This option overrides ENABLE_* options for specific instruction set. Highly not recommended to use." 0)
if (ARCH_NATIVE)
set (COMPILER_FLAGS "${COMPILER_FLAGS} -march=native")
# Populate the ENABLE_ option flags. This is required for the build of some third-party dependencies, specifically snappy, which
# (somewhat weirdly) expects the relative SNAPPY_HAVE_ preprocessor variables to be populated, in addition to the microarchitecture
# feature flags being enabled in the compiler. This fixes the ARCH_NATIVE flag by automatically populating the ENABLE_ option flags
# according to the current CPU's capabilities, detected using clang.
if (ARCH_AMD64)
execute_process(
COMMAND sh -c "clang -E - -march=native -###"
INPUT_FILE /dev/null
OUTPUT_QUIET
ERROR_VARIABLE TEST_FEATURE_RESULT)
macro(TEST_AMD64_FEATURE TEST_FEATURE_RESULT feat flag)
if (${TEST_FEATURE_RESULT} MATCHES "\"\\+${feat}\"")
set(${flag} ON)
else ()
set(${flag} OFF)
endif ()
endmacro()
TEST_AMD64_FEATURE (${TEST_FEATURE_RESULT} ssse3 ENABLE_SSSE3)
TEST_AMD64_FEATURE (${TEST_FEATURE_RESULT} sse4.1 ENABLE_SSE41)
TEST_AMD64_FEATURE (${TEST_FEATURE_RESULT} sse4.2 ENABLE_SSE42)
TEST_AMD64_FEATURE (${TEST_FEATURE_RESULT} vpclmulqdq ENABLE_PCLMULQDQ)
TEST_AMD64_FEATURE (${TEST_FEATURE_RESULT} popcnt ENABLE_POPCNT)
TEST_AMD64_FEATURE (${TEST_FEATURE_RESULT} avx ENABLE_AVX)
TEST_AMD64_FEATURE (${TEST_FEATURE_RESULT} avx2 ENABLE_AVX2)
TEST_AMD64_FEATURE (${TEST_FEATURE_RESULT} avx512f ENABLE_AVX512)
TEST_AMD64_FEATURE (${TEST_FEATURE_RESULT} avx512vbmi ENABLE_AVX512_VBMI)
TEST_AMD64_FEATURE (${TEST_FEATURE_RESULT} bmi ENABLE_BMI)
TEST_AMD64_FEATURE (${TEST_FEATURE_RESULT} bmi2 ENABLE_BMI2)
endif ()
elseif (ARCH_AARCH64)
# ARM publishes almost every year a new revision of it's ISA [1]. Each version comes with new mandatory and optional features from
# which CPU vendors can pick and choose. This creates a lot of variability ... We provide two build "profiles", one for maximum
# compatibility intended to run on all 64-bit ARM hardware released after 2013 (e.g. Raspberry Pi 4), and one for modern ARM server
# CPUs, (e.g. Graviton).
#
# [1] https://en.wikipedia.org/wiki/AArch64
option (NO_ARMV81_OR_HIGHER "Disable ARMv8.1 or higher on Aarch64 for maximum compatibility with older/embedded hardware." 0)
if (NO_ARMV81_OR_HIGHER)
# crc32 is optional in v8.0 and mandatory in v8.1. Enable it as __crc32()* is used in lot's of places and even very old ARM CPUs
# support it.
set (COMPILER_FLAGS "${COMPILER_FLAGS} -march=armv8+crc")
else ()
# ARMv8.2 is quite ancient but the lowest common denominator supported by both Graviton 2 and 3 processors [1, 10]. In particular, it
# includes LSE (made mandatory with ARMv8.1) which provides nice speedups without having to fall back to compat flag
# "-moutline-atomics" for v8.0 [2, 3, 4] that requires a recent glibc with runtime dispatch helper, limiting our ability to run on
# old OSs.
#
# simd: NEON, introduced as optional in v8.0, A few extensions were added with v8.1 but it's still not mandatory. Enables the
# compiler to auto-vectorize.
# sve: Scalable Vector Extensions, introduced as optional in v8.2. Available in Graviton 3 but not in Graviton 2, and most likely
# also not in CI machines. Compiler support for autovectorization is rudimentary at the time of writing, see [5]. Can be
# enabled one-fine-day (TM) but not now.
# ssbs: "Speculative Store Bypass Safe". Optional in v8.0, mandatory in v8.5. Meltdown/spectre countermeasure.
# crypto: SHA1, SHA256, AES. Optional in v8.0. In v8.4, further algorithms were added but it's still optional, see [6].
# dotprod: Scalar vector product (SDOT and UDOT instructions). Probably the most obscure extra flag with doubtful performance benefits
# but it has been activated since always, so why not enable it. It's not 100% clear in which revision this flag was
# introduced as optional, either in v8.2 [7] or in v8.4 [8].
# rcpc: Load-Acquire RCpc Register. Better support of release/acquire of atomics. Good for allocators and high contention code.
# Optional in v8.2, mandatory in v8.3 [9]. Supported in Graviton >=2, Azure and GCP instances.
# bf16: Bfloat16, a half-precision floating point format developed by Google Brain. Optional in v8.2, mandatory in v8.6.
#
# [1] https://github.com/aws/aws-graviton-getting-started/blob/main/c-c%2B%2B.md
# [2] https://community.arm.com/arm-community-blogs/b/tools-software-ides-blog/posts/making-the-most-of-the-arm-architecture-in-gcc-10
# [3] https://mysqlonarm.github.io/ARM-LSE-and-MySQL/
# [4] https://dev.to/aws-builders/large-system-extensions-for-aws-graviton-processors-3eci
# [5] https://developer.arm.com/tools-and-software/open-source-software/developer-tools/llvm-toolchain/sve-support
# [6] https://developer.arm.com/documentation/100067/0612/armclang-Command-line-Options/-mcpu?lang=en
# [7] https://gcc.gnu.org/onlinedocs/gcc/ARM-Options.html
# [8] https://developer.arm.com/documentation/102651/a/What-are-dot-product-intructions-
# [9] https://developer.arm.com/documentation/dui0801/g/A64-Data-Transfer-Instructions/LDAPR?lang=en
# [10] https://github.com/aws/aws-graviton-getting-started/blob/main/README.md
set (COMPILER_FLAGS "${COMPILER_FLAGS} -march=armv8.2-a+simd+crypto+dotprod+ssbs+rcpc+bf16")
endif ()
# Best-effort check: The build generates and executes intermediate binaries, e.g. protoc and llvm-tablegen. If we build on ARM for ARM
# and the build machine is too old, i.e. doesn't satisfy above modern profile, then these intermediate binaries will not run (dump
# SIGILL). Even if they could run, the build machine wouldn't be able to run the ClickHouse binary. In that case, suggest to run the
# build with the compat profile.
if (OS_LINUX AND CMAKE_HOST_SYSTEM_PROCESSOR MATCHES "^(aarch64.*|AARCH64.*|arm64.*|ARM64.*)" AND NOT NO_ARMV81_OR_HIGHER)
# CPU features in /proc/cpuinfo and compiler flags don't align :( ... pick some obvious flags contained in the modern but not in the
# legacy profile (full Graviton 3 /proc/cpuinfo is "fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics fphp asimdhp cpuid asimdrdm
# jscvt fcma lrcpc dcpop sha3 sm3 sm4 asimddp sha512 sve asimdfhm dit uscat ilrcpc flagm ssbs paca pacg dcpodp svei8mm svebf16 i8mm
# bf16 dgh rng")
execute_process(
COMMAND grep -P "^(?=.*atomic)(?=.*ssbs)" /proc/cpuinfo
OUTPUT_VARIABLE FLAGS)
if (NOT FLAGS)
MESSAGE(FATAL_ERROR "The build machine does not satisfy the minimum CPU requirements, try to run cmake with -DNO_ARMV81_OR_HIGHER=1")
endif()
endif()
elseif (ARCH_PPC64LE)
# By Default, build for power8 and up, allow building for power9 and up
# Note that gcc and clang have support for x86 SSE2 intrinsics when building for PowerPC
option (POWER9 "Build for Power 9 CPU and above" 0)
if(POWER9)
set (COMPILER_FLAGS "${COMPILER_FLAGS} -maltivec -mcpu=power9 -D__SSE2__=1 -DNO_WARN_X86_INTRINSICS")
else ()
set (COMPILER_FLAGS "${COMPILER_FLAGS} -maltivec -mcpu=power8 -D__SSE2__=1 -DNO_WARN_X86_INTRINSICS")
endif ()
elseif (ARCH_AMD64)
option (ENABLE_SSSE3 "Use SSSE3 instructions on x86_64" 1)
option (ENABLE_SSE41 "Use SSE4.1 instructions on x86_64" 1)
option (ENABLE_SSE42 "Use SSE4.2 instructions on x86_64" 1)
option (ENABLE_PCLMULQDQ "Use pclmulqdq instructions on x86_64" 1)
option (ENABLE_POPCNT "Use popcnt instructions on x86_64" 1)
option (ENABLE_AVX "Use AVX instructions on x86_64" 0)
option (ENABLE_AVX2 "Use AVX2 instructions on x86_64" 0)
option (ENABLE_AVX512 "Use AVX512 instructions on x86_64" 0)
option (ENABLE_AVX512_VBMI "Use AVX512_VBMI instruction on x86_64 (depends on ENABLE_AVX512)" 0)
option (ENABLE_BMI "Use BMI instructions on x86_64" 0)
option (ENABLE_BMI2 "Use BMI2 instructions on x86_64 (depends on ENABLE_AVX2)" 0)
option (ENABLE_AVX2_FOR_SPEC_OP "Use avx2 instructions for specific operations on x86_64" 0)
option (ENABLE_AVX512_FOR_SPEC_OP "Use avx512 instructions for specific operations on x86_64" 0)
option (NO_SSE3_OR_HIGHER "Disable SSE3 or higher on x86_64 for maximum compatibility with older/embedded hardware." 0)
if (NO_SSE3_OR_HIGHER)
SET(ENABLE_SSSE3 0)
SET(ENABLE_SSE41 0)
SET(ENABLE_SSE42 0)
SET(ENABLE_PCLMULQDQ 0)
SET(ENABLE_POPCNT 0)
SET(ENABLE_AVX 0)
SET(ENABLE_AVX2 0)
SET(ENABLE_AVX512 0)
SET(ENABLE_AVX512_VBMI 0)
SET(ENABLE_BMI 0)
SET(ENABLE_BMI2 0)
SET(ENABLE_AVX2_FOR_SPEC_OP 0)
SET(ENABLE_AVX512_FOR_SPEC_OP 0)
endif()
# Same best-effort check for x86 as above for ARM.
if (OS_LINUX AND CMAKE_HOST_SYSTEM_PROCESSOR MATCHES "amd64|x86_64" AND NOT NO_SSE3_OR_HIGHER)
# Test for flags in standard profile but not in NO_SSE3_OR_HIGHER profile.
# /proc/cpuid for Intel Xeon 8124: "fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse
# sse2 ss ht syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon rep_good nopl xtopology nonstop_tsc cpuid aperfmperf
# tsc_known_freq pni pclmulqdq monitor ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c
# rdrand hypervisor lahf_lm abm 3dnowprefetch invpcid_single pti fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm mpx
# avx512f avx512dq rdseed adx smap clflushopt clwb avx512cd avx512bw avx512vl xsaveopt xsavec xgetbv1 xsaves ida arat pku ospke""
execute_process(
COMMAND grep -P "^(?=.*ssse3)(?=.*sse4_1)(?=.*sse4_2)" /proc/cpuinfo
OUTPUT_VARIABLE FLAGS)
if (NOT FLAGS)
MESSAGE(FATAL_ERROR "The build machine does not satisfy the minimum CPU requirements, try to run cmake with -DNO_SSE3_OR_HIGHER=1")
endif()
endif()
# ClickHouse can be cross-compiled (e.g. on an ARM host for x86) but it is also possible to build ClickHouse on x86 w/o AVX for x86 w/
# AVX. We only assume that the compiler can emit certain SIMD instructions, we don't care if the host system is able to run the binary.
if (ENABLE_SSSE3)
set (COMPILER_FLAGS "${COMPILER_FLAGS} -mssse3")
endif ()
if (ENABLE_SSE41)
set (COMPILER_FLAGS "${COMPILER_FLAGS} -msse4.1")
endif ()
if (ENABLE_SSE42)
set (COMPILER_FLAGS "${COMPILER_FLAGS} -msse4.2")
endif ()
if (ENABLE_PCLMULQDQ)
set (COMPILER_FLAGS "${COMPILER_FLAGS} -mpclmul")
endif ()
if (ENABLE_BMI)
set (COMPILER_FLAGS "${COMPILER_FLAGS} -mbmi")
endif ()
if (ENABLE_POPCNT)
set (COMPILER_FLAGS "${COMPILER_FLAGS} -mpopcnt")
endif ()
if (ENABLE_AVX)
set (COMPILER_FLAGS "${COMPILER_FLAGS} -mavx")
endif ()
if (ENABLE_AVX2)
set (COMPILER_FLAGS "${COMPILER_FLAGS} -mavx2")
if (ENABLE_BMI2)
set (COMPILER_FLAGS "${COMPILER_FLAGS} -mbmi2")
endif ()
endif ()
if (ENABLE_AVX512)
set (COMPILER_FLAGS "${COMPILER_FLAGS} -mavx512f -mavx512bw -mavx512vl")
if (ENABLE_AVX512_VBMI)
set (COMPILER_FLAGS "${COMPILER_FLAGS} -mavx512vbmi")
endif ()
endif ()
if (ENABLE_AVX512_FOR_SPEC_OP)
set (X86_INTRINSICS_FLAGS "-mbmi -mavx512f -mavx512bw -mavx512vl -mprefer-vector-width=256")
endif ()
else ()
# RISC-V + exotic platforms
endif ()
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