Some applications require specific architecture levels of x86-64 processor: x86-64-v2, x86-64-v3 or x86-64-v4.
These scripts can tell which x86-64 CPU level you are running.
Note: Useful for virtualization/emulation platforms, where you can set CPU type or specific CPU flags.
| #!/bin/sh | |
| set -e | |
| verbose= | |
| while getopts v OPTLET; do | |
| case "$OPTLET" in | |
| v) verbose=1;; | |
| \?) exit 2;; | |
| esac | |
| done | |
| flags=$(grep '^flags\b' </proc/cpuinfo | head -n 1) | |
| flags=" ${flags#*:} " | |
| has_flags () { | |
| for flag; do | |
| case "$flags" in | |
| *" $flag "*) :;; | |
| *) | |
| if [ -n "$verbose" ]; then | |
| echo >&2 "Missing $flag for the next level" | |
| fi | |
| return 1;; | |
| esac | |
| done | |
| } | |
| determine_level () { | |
| level=0 | |
| has_flags lm cmov cx8 fpu fxsr mmx syscall sse2 || return 0 | |
| level=1 | |
| has_flags cx16 lahf_lm popcnt sse4_1 sse4_2 ssse3 || return 0 | |
| level=2 | |
| has_flags avx avx2 bmi1 bmi2 f16c fma abm movbe xsave || return 0 | |
| level=3 | |
| has_flags avx512f avx512bw avx512cd avx512dq avx512vl || return 0 | |
| level=4 | |
| } | |
| determine_level | |
| echo "$level" |
| #!/bin/sh -eu | |
| flags=$(cat /proc/cpuinfo | grep flags | head -n 1 | cut -d: -f2) | |
| supports_v2='awk "/cx16/&&/lahf/&&/popcnt/&&/sse4_1/&&/sse4_2/&&/ssse3/ {found=1} END {exit !found}"' | |
| supports_v3='awk "/avx/&&/avx2/&&/bmi1/&&/bmi2/&&/f16c/&&/fma/&&/abm/&&/movbe/&&/xsave/ {found=1} END {exit !found}"' | |
| supports_v4='awk "/avx512f/&&/avx512bw/&&/avx512cd/&&/avx512dq/&&/avx512vl/ {found=1} END {exit !found}"' | |
| echo "$flags" | eval $supports_v2 || exit 2 && echo "CPU supports x86-64-v2" | |
| echo "$flags" | eval $supports_v3 || exit 3 && echo "CPU supports x86-64-v3" | |
| echo "$flags" | eval $supports_v4 || exit 4 && echo "CPU supports x86-64-v4" |