;;; GNU Guix --- Functional package management for GNU ;;; Copyright © 2021 Ludovic Courtès ;;; Copyright © 2022 Efraim Flashner ;;; ;;; This file is part of GNU Guix. ;;; ;;; GNU Guix is free software; you can redistribute it and/or modify it ;;; under the terms of the GNU General Public License as published by ;;; the Free Software Foundation; either version 3 of the License, or (at ;;; your option) any later version. ;;; ;;; GNU Guix is distributed in the hope that it will be useful, but ;;; WITHOUT ANY WARRANTY; without even the implied warranty of ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ;;; GNU General Public License for more details. ;;; ;;; You should have received a copy of the GNU General Public License ;;; along with GNU Guix. If not, see . (define-module (guix cpu) #:use-module (guix sets) #:use-module (guix memoization) #:use-module (srfi srfi-1) #:use-module (srfi srfi-9) #:use-module (ice-9 match) #:use-module (ice-9 rdelim) #:export (current-cpu cpu? cpu-architecture cpu-vendor cpu-family cpu-model cpu-flags cpu->gcc-architecture)) ;;; Commentary: ;;; ;;; This module provides tools to determine the micro-architecture supported ;;; by the CPU and to map it to a name known to GCC's '-march'. ;;; ;;; Code: ;; CPU description. (define-record-type (cpu architecture vendor family model flags) cpu? (architecture cpu-architecture) ;string, from 'uname' (vendor cpu-vendor) ;string (family cpu-family) ;integer (model cpu-model) ;integer (flags cpu-flags)) ;set of strings (define current-cpu (mlambda () "Return a record representing the host CPU." (define (prefix? prefix) (lambda (str) (string-prefix? prefix str))) (call-with-input-file "/proc/cpuinfo" (lambda (port) (let loop ((vendor #f) (family #f) (model #f) (flags '())) (match (read-line port) ((? eof-object?) (cpu (utsname:machine (uname)) vendor family model (list->set flags))) ((? (prefix? "vendor_id") str) (match (string-tokenize str) (("vendor_id" ":" vendor) (loop vendor family model flags)))) ((? (prefix? "CPU implementer") str) (match (string-tokenize str) (("CPU" "implementer" ":" vendor) (loop vendor family model flags)))) ((? (prefix? "cpu family") str) (match (string-tokenize str) (("cpu" "family" ":" family) (loop vendor (string->number family) model flags)))) ((? (prefix? "CPU architecture") str) (match (string-tokenize str) (("CPU" "architecture:" family) (loop vendor family model flags)))) ((? (prefix? "model") str) (match (string-tokenize str) (("model" ":" model) (loop vendor family (string->number model) flags)) (_ (loop vendor family model flags)))) ((? (prefix? "CPU part") str) (match (string-tokenize str) (("CPU" "part" ":" model) (loop vendor family (string->number (substring model 2) 16) flags)))) ((? (prefix? "flags") str) (match (string-tokenize str) (("flags" ":" flags ...) (loop vendor family model flags)))) ((? (prefix? "Features") str) (match (string-tokenize str) (("Features" ":" flags ...) (loop vendor family model flags)))) (_ (loop vendor family model flags)))))))) (define (cpu->gcc-architecture cpu) "Return the architecture name, suitable for GCC's '-march' flag, that corresponds to CPU, a record as returned by 'current-cpu'." (match (cpu-architecture cpu) ("x86_64" ;; Transcribed from GCC's 'host_detect_local_cpu' in driver-i386.c. (or (and (equal? "GenuineIntel" (cpu-vendor cpu)) (= 6 (cpu-family cpu)) ;the "Pentium Pro" family (letrec-syntax ((if-flags (syntax-rules (=>) ((_) #f) ((_ (flags ... => name) rest ...) (if (every (lambda (flag) (set-contains? (cpu-flags cpu) flag)) '(flags ...)) name (if-flags rest ...)))))) (if-flags ("avx" "avx512vp2intersect" "tsxldtrk" => "sapphirerapids") ("avx" "avx512vp2intersect" => "tigerlake") ("avx" "avx512bf16" => "cooperlake") ("avx" "wbnoinvd" => "icelake-server") ("avx" "avx512bitalg" => "icelake-client") ("avx" "avx512vbmi" => "cannonlake") ("avx" "avx5124vnniw" => "knm") ("avx" "avx512er" => "knl") ("avx" "avx512f" => "skylake-avx512") ("avx" "serialize" => "alderlake") ("avx" "clflushopt" => "skylake") ("avx" "adx" => "broadwell") ("avx" "avx2" => "haswell") ("avx" => "sandybridge") ("sse4_2" "gfni" => "tremont") ("sse4_2" "sgx" => "goldmont-plus") ("sse4_2" "xsave" => "goldmont") ("sse4_2" "movbe" => "silvermont") ("sse4_2" => "nehalem") ("ssse3" "movbe" => "bonnell") ("ssse3" => "core2") ("longmode" => "x86-64")))) (and (equal? "AuthenticAMD" (cpu-vendor cpu)) (letrec-syntax ((if-flags (syntax-rules (=>) ((_) #f) ((_ (flags ... => name) rest ...) (if (every (lambda (flag) (set-contains? (cpu-flags cpu) flag)) '(flags ...)) name (if-flags rest ...)))))) (or (and (= 22 (cpu-family cpu)) (if-flags ("movbe" => "btver2"))) (and (= 6 (cpu-family cpu)) (if-flags ("3dnowp" => "athalon"))) (if-flags ("vaes" => "znver3") ("clwb" => "znver2") ("clzero" => "znver1") ("avx2" => "bdver4") ("xsaveopt" => "bdver3") ("bmi" => "bdver2") ("xop" => "bdver1") ("sse4a" "has_ssse3" => "btver1") ("sse4a" => "amdfam10") ("sse2" "sse3" => "k8-sse3") ("longmode" "sse3" => "k8-sse3") ("sse2" => "k8") ("longmode" => "k8") ("mmx" "3dnow" => "k6-3") ("mmx" => "k6") (_ => "pentium"))))) ;; Fallback case for non-Intel processors or for Intel processors not ;; recognized above. (letrec-syntax ((if-flags (syntax-rules (=>) ((_) #f) ((_ (flags ... => name) rest ...) (if (every (lambda (flag) (set-contains? (cpu-flags cpu) flag)) '(flags ...)) name (if-flags rest ...)))))) (if-flags ("avx512" => "knl") ("adx" => "broadwell") ("avx2" => "haswell") ;; TODO: tigerlake, cooperlake, etc. ("avx" => "sandybridge") ("sse4_2" "gfni" => "tremont") ("sse4_2" "sgx" => "goldmont-plus") ("sse4_2" "xsave" => "goldmont") ("sse4_2" "movbe" => "silvermont") ("sse4_2" => "nehalem") ("ssse3" "movbe" => "bonnell") ("ssse3" => "core2"))) ;; TODO: Recognize CENTAUR/CYRIX/NSC? "x86_64")) (architecture ;; TODO: AArch64. architecture)))