mirror of
https://github.com/official-stockfish/Stockfish.git
synced 2026-07-22 12:47:08 +00:00
CiekceandJoost VandeVondele
0c1001c93e
Excavator also supports BMI2, where it has the same microcoded performance implications as on Zen pre-3. closes https://github.com/official-stockfish/Stockfish/pull/6868 No functional change
365 lines
8.0 KiB
Bash
Executable File
365 lines
8.0 KiB
Bash
Executable File
#!/bin/sh
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#
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# Returns the best architecture supported by the CPU (as expected by src/Makefile ARCH=).
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#
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# Output format:
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# "<true_arch>\n"
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#
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# ---------------------------
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# Helpers (POSIX)
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# ---------------------------
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# Test hooks (optional env overrides)
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# GP_UNAME_S: override `uname -s`
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# GP_UNAME_M: override `uname -m`
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# GP_CPUINFO: path to a cpuinfo-like fixture file (defaults to /proc/cpuinfo)
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# GP_BITS: override getconf LONG_BIT result (32/64)
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# GP_SYSCTL_FEATURES: override sysctl feature strings on Darwin x86_64
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cpuinfo_path=${GP_CPUINFO:-/proc/cpuinfo}
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# Normalize to a single-line, space-separated string.
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normalize_ws() {
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printf '%s\n' "$*" | tr '\n\t' ' ' | tr -s ' '
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}
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die() {
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printf '%s\n' "$*" >&2
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exit 1
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}
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# Populate $flags from /proc/cpuinfo when available,
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# removing underscores and dots to reduce naming variations.
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get_flags() {
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if [ -r "$cpuinfo_path" ]; then
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flags=$(
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awk '
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/^flags[ \t]*:|^Features[ \t]*:/ {
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if (!found) {
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gsub(/^flags[ \t]*:[ \t]*|^Features[ \t]*:[ \t]*|[_.]/, "");
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line=$0
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found=1
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}
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}
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END { print line }
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' "$cpuinfo_path" 2>/dev/null
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)
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else
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flags=''
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fi
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flags=$(printf '%s\n' "$flags" | tr '[:upper:]' '[:lower:]')
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flags=$(normalize_ws "$flags")
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}
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# Populate $flags from sysctl on Darwin x86_64.
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get_sysctl_flags() {
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if [ -n "${GP_SYSCTL_FEATURES:-}" ]; then
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flags=$(printf '%s\n' "$GP_SYSCTL_FEATURES")
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else
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flags=$(sysctl -n machdep.cpu.features machdep.cpu.leaf7_features 2>/dev/null)
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fi
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flags=$(printf '%s\n' "$flags" | tr '\n' ' ' | tr '[:upper:]' '[:lower:]' | tr -d '._')
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flags=$(normalize_ws "$flags")
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}
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# Best-effort bitness for fallback arch selection.
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get_bits() {
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if [ -n "${GP_BITS:-}" ]; then
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bits=$GP_BITS
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else
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bits=$(getconf LONG_BIT 2>/dev/null)
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fi
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case $bits in
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32|64) : ;;
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*) bits=64 ;;
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esac
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}
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# Extract ARM architecture level (5/6/7/8/...) from /proc/cpuinfo when present.
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get_arm_arch_level() {
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[ -r "$cpuinfo_path" ] || return 1
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awk '
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/^CPU architecture[ \t]*:/{
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s=$0
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sub(/^[^:]*:[ \t]*/, "", s)
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if (match(s, /[0-9]+/)) { print substr(s, RSTART, RLENGTH); exit }
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}
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/^Processor[ \t]*:/{
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s=$0
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sub(/^[^:]*:[ \t]*/, "", s)
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if (match(s, /ARMv[0-9]+/)) { print substr(s, RSTART+4, RLENGTH-4); exit }
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}
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' "$cpuinfo_path" 2>/dev/null
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}
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# Best-effort ARM architecture level (5/6/7/8/...) with a minimal fallback.
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# Prefer /proc/cpuinfo when available; fall back to uname -m only when it encodes it.
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get_arm_level() {
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arm_level=$(get_arm_arch_level || :)
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if [ -n "$arm_level" ]; then
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printf '%s\n' "$arm_level"
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return 0
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fi
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case ${1:-} in
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armv5*) printf '5\n' ;;
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armv6*) printf '6\n' ;;
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armv7*) printf '7\n' ;;
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armv8l) printf '8\n' ;;
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*) return 1 ;;
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esac
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}
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# Whole-token membership check.
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has_flag() {
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case " $flags " in
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*" $1 "*) return 0 ;;
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*) return 1 ;;
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esac
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}
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match_flags() {
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for f; do
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has_flag "$f" || return 1
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done
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return 0
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}
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match_any_flags() {
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for f; do
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has_flag "$f" && return 0
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done
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return 1
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}
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# SSE3 is often exposed as "pni" in /proc/cpuinfo.
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match_sse3() {
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match_any_flags sse3 pni
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}
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# AMD Excavator/Zen1/2 exclusion logic (used for bmi2 tier).
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# https://web.archive.org/web/20250821132355/https://en.wikichip.org/wiki/amd/cpuid
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# All of Bulldozer through Excavator are matched here, but pre-Excavator doesn't support bmi2 anyway
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has_slow_bmi2() (
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[ -r "$cpuinfo_path" ] || exit 1
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vendor_id=$(awk '/^vendor_id/{print $3; exit}' "$cpuinfo_path" 2>/dev/null)
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cpu_family=$(awk '/^cpu family/{print $4; exit}' "$cpuinfo_path" 2>/dev/null)
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[ "$vendor_id" = "AuthenticAMD" ] \
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&& { [ "$cpu_family" = "21" ] || [ "$cpu_family" = "23" ]; }
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)
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match_not_slow_bmi2_and_flags() {
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has_slow_bmi2 && return 1
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match_flags "$@"
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}
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match_sse3_popcnt() {
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has_flag popcnt || return 1
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match_sse3
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}
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match_true() { return 0; }
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# Generic selector: reads lines like "arch|predicate|arg1 arg2 ..."
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# First match wins; blank lines and lines starting with '#' are ignored.
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select_arch_from_table() {
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while IFS='|' read -r arch pred args; do
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[ -z "$arch" ] && continue
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case $arch in \#*) continue ;; esac
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if [ -n "$args" ]; then
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# Intentional splitting of args into words for the predicate.
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# shellcheck disable=SC2086
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$pred $args && { printf '%s\n' "$arch"; return 0; }
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else
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$pred && { printf '%s\n' "$arch"; return 0; }
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fi
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done
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return 1
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}
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# ---------------------------
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# Arch selection (table-driven)
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# ---------------------------
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set_arch_loongarch64() {
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true_arch=$(
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select_arch_from_table <<'EOF'
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loongarch64-lasx|match_flags|lasx
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loongarch64-lsx|match_flags|lsx
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loongarch64|match_true|
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EOF
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)
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}
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set_arch_x86_64() {
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true_arch=$(
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select_arch_from_table <<'EOF'
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# Strongest -> weakest (first match wins)
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x86-64-avx512icl|match_flags|avx512f avx512cd avx512vl avx512dq avx512bw avx512ifma avx512vbmi avx512vbmi2 avx512vpopcntdq avx512bitalg avx512vnni vpclmulqdq gfni vaes
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x86-64-vnni512|match_flags|avx512vnni avx512dq avx512f avx512bw avx512vl
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x86-64-avx512|match_flags|avx512f avx512bw
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x86-64-avxvnni|match_flags|avxvnni
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x86-64-bmi2|match_not_slow_bmi2_and_flags|bmi2
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x86-64-avx2|match_flags|avx2
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x86-64-sse41-popcnt|match_flags|sse41 popcnt
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x86-64-ssse3|match_flags|ssse3
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x86-64-sse3-popcnt|match_sse3_popcnt|
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x86-64|match_true|
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EOF
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)
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}
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set_arch_x86_32() {
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true_arch=$(
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select_arch_from_table <<'EOF'
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x86-32-sse41-popcnt|match_flags|sse41 popcnt
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x86-32-sse2|match_flags|sse2
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x86-32|match_true|
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EOF
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)
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}
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# PPC64 needs a little parsing to distinguish vsx vs altivec.
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set_arch_ppc_64() {
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if [ -r "$cpuinfo_path" ] && grep -q "altivec" "$cpuinfo_path" 2>/dev/null; then
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# Typical: "cpu : POWER8E" (extract the number after POWER)
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power=$(
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awk -F: '/^cpu[ \t]*:/{print $2; exit}' "$cpuinfo_path" 2>/dev/null \
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| sed -n 's/.*[Pp][Oo][Ww][Ee][Rr][^0-9]*\([0-9][0-9]*\).*/\1/p'
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)
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if [ -z "$power" ]; then
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power=$(
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awk -F: '/^cpu[ \t]*:/{print $2; exit}' "$cpuinfo_path" 2>/dev/null \
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| sed -n 's/.*\([0-9][0-9]*\).*/\1/p'
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)
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fi
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case $power in
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''|*[!0-9]*)
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true_arch='ppc-64-altivec'
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;;
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*)
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if [ "$power" -gt 7 ] 2>/dev/null; then
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true_arch='ppc-64-vsx'
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else
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true_arch='ppc-64-altivec'
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fi
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;;
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esac
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else
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true_arch='ppc-64'
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fi
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}
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# ---------------------------
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# OS / machine dispatch
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# ---------------------------
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uname_s=$(uname -s 2>/dev/null)
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uname_m=$(uname -m 2>/dev/null)
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uname_s=${GP_UNAME_S:-$uname_s}
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uname_m=${GP_UNAME_M:-$uname_m}
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case $uname_s in
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Darwin)
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case $uname_m in
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arm64)
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true_arch='apple-silicon'
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;;
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x86_64)
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get_sysctl_flags
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set_arch_x86_64
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;;
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*)
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get_bits
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if [ "$bits" = "32" ]; then
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true_arch='general-32'
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else
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true_arch='general-64'
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fi
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;;
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esac
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;;
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Linux)
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get_flags
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case $uname_m in
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x86_64)
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set_arch_x86_64
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;;
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i?86)
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set_arch_x86_32
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;;
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ppc64*)
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set_arch_ppc_64
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;;
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aarch64|arm64)
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true_arch='armv8'
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if match_flags asimddp; then
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true_arch='armv8-dotprod'
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fi
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;;
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armv5*|armv6*|armv7*|armv8l|arm*)
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arm_level=$(get_arm_level "$uname_m" || :)
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case $arm_level in
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5|6)
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true_arch='general-32'
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;;
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7|8)
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true_arch='armv7'
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if match_flags neon; then
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true_arch='armv7-neon'
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fi
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;;
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*)
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true_arch='general-32'
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if match_flags neon; then
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true_arch='armv7-neon'
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fi
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;;
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esac
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;;
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loongarch64*)
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set_arch_loongarch64
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;;
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riscv64)
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true_arch='riscv64'
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;;
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e2k*)
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true_arch='e2k'
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;;
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ppc|ppc32|powerpc)
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true_arch='ppc-32'
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;;
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*)
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# Don't hard-fail: fall back to general-* so ARCH=native still builds
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get_bits
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if [ "$bits" = "32" ]; then
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true_arch='general-32'
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else
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true_arch='general-64'
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fi
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;;
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esac
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;;
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MINGW*ARM64*)
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# Windows ARM64 (MSYS2/MinGW)
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# Can't reliably detect ARM CPU features here
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true_arch='armv8-dotprod'
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;;
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CYGWIN*|MINGW*|MSYS*)
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# Windows x86_64 (MSYS2/Cygwin/MinGW)
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get_flags
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set_arch_x86_64
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;;
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*)
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die "Unsupported system type: $uname_s"
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;;
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esac
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printf '%s\n' "$true_arch"
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