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guix: cpu: Add gcc-architecture->micro-architecture-level mapping.

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* guix/cpu.scm (gcc-architecture->micro-architecture-level): New
variable.
This commit is contained in:
Efraim Flashner 2023-06-20 10:41:24 +03:00
parent 4dd5fa9e76
commit 1701b1244d
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1 changed files with 23 additions and 1 deletions
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24
guix/cpu.scm
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@ -32,7 +32,8 @@
cpu-model
cpu-flags
cpu->gcc-architecture))
cpu->gcc-architecture
gcc-architecture->micro-architecture-level))
;;; Commentary:
;;;
@ -283,3 +284,24 @@ correspond roughly to CPU, a record as returned by 'current-cpu'."
(architecture
;; TODO: More architectures
architecture)))
(define (gcc-architecture->micro-architecture-level gcc-architecture)
"Return a matching psABI micro-architecture, allowing optimizations for x86_64
CPUs for compilers which don't allow for more focused optimizing."
;; Matching gcc-architectures isn't an easy task, with the rule-of-thumb being
;; 'Haswell and higher' qualify for x86_64-v3.
;; https://gitlab.com/x86-psABIs/x86-64-ABI/-/blob/master/x86-64-ABI/low-level-sys-info.tex
(match gcc-architecture
((or "grandridge" "graniterapids" "sierraforest" "tigerlake"
"sapphirerapids" "cooperlake" "icelake-server" "icelake-client"
"cannonlake" "knm" "knl" "skylake-avx512" "alderlake" "skylake"
"broadwell" "haswell"
"znver4" "znver3" "znver2" "znver1" "bdver4")
"x86_64-v3")
((or "sandybridge" "tremont" "goldmont-plus" "goldmont" "silvermont"
"nehalem" "bonnell" "core2"
"btver2" "athalon" "k8-sse3" "k8" "bdver3" "bdver2" "bdver1" "btver1"
"amdfam10"
"lujiazui" "x86-64")
"x86_64-v1")
(_ gcc-architecture)))