From 4204c922f87e8f2d9f5d37c717caf60cfdace478 Mon Sep 17 00:00:00 2001
From: Niklas Fiekas <niklas.fiekas@backscattering.de>
Date: Sun, 22 May 2022 13:06:58 +0200
Subject: [PATCH] Optimize target selection and use profile-build

* Add aarch64 to arch array
* On x86_64, add detection for all supported CPU capabilities (excluding
  x86-64-modern which is an alias for x86-64-sse41-popcnt)
* Fix performance on AMD before Zen 3
* Build with profile-guided optimization
---
 PKGBUILD | 30 ++++++++++++++++++++++++------
 1 file changed, 24 insertions(+), 6 deletions(-)

diff --git a/PKGBUILD b/PKGBUILD
index 3c870b0..ed3a5b6 100644
--- a/PKGBUILD
+++ b/PKGBUILD
@@ -5,13 +5,14 @@
 # Contributor: P. Badredin <p dot badredin at gmail dot com>
 # Contributor: Justin Blanchard <UncombedCoconut at gmail dot com>
 # Contributor: Auguste Pop < auguste [at] gmail [dot] com >
+# Contributor: niklas.fiekas at backscattering dot de
 
 pkgname=stockfish
 pkgver=15
-pkgrel=1
+pkgrel=2
 epoch=1
 pkgdesc="A strong chess engine written by Tord Romstad, Marco Costalba, Joona Kiiski"
-arch=('x86_64' 'i686' 'armv7h')
+arch=('x86_64' 'i686' 'armv7h' 'aarch64')
 url="https://stockfishchess.org/"
 license=('GPL3')
 depends=('glibc')
@@ -27,15 +28,32 @@ build() {
     _arch=armv8
   elif [[ "$CARCH" == "i686" ]]; then
     _arch=x86-32
+  elif grep -wq avx512dq /proc/cpuinfo && grep -wq avx512vl /proc/cpuinfo && grep -wq avx512_vnni /proc/cpuinfo; then
+    _arch=x86-64-vnni512
+  elif grep -wq avx512f /proc/cpuinfo && grep -wq avx512bw /proc/cpuinfo; then
+    _arch=x86-64-avx512
   elif grep -wq bmi2 /proc/cpuinfo; then
-    _arch=x86-64-bmi2
-  elif grep -w popcnt /proc/cpuinfo | grep -wqv cr8_legacy; then
-    _arch=x86-64-modern
+    if grep -wq GenuineIntel /proc/cpuinfo; then
+      _arch=x86-64-bmi2
+    elif grep -wq AuthenticAMD /proc/cpuinfo && [[ "$(grep --max-count=1 'cpu family' /proc/cpuinfo | sed -e 's/^.*: //')" -ge 25 ]]; then
+      _arch=x86-64-bmi2
+    else
+      # On AMD, bmi2 is emulated before Zen 3, so that using it is a slowdown
+      _arch=x86-64-avx2
+    fi
+  elif grep -wq avx2 /proc/cpuinfo; then
+    _arch=x86-64-avx2
+  elif grep -wq sse4_1 /proc/cpuinfo && grep -wq popcnt /proc/cpuinfo; then
+    _arch=x86-64-sse41-popcnt
+  elif grep -wq ssse3 /proc/cpuinfo; then
+    _arch=x86-64-ssse3
+  elif grep -wq pni /proc/cpuinfo && grep -wq popcnt /proc/cpuinfo; then
+    _arch=x86-64-sse3-popcnt
   else
     _arch=x86-64
   fi
 
-  make build ARCH="$_arch" COMP=gcc
+  make profile-build ARCH="$_arch" COMP=gcc
 }
 
 package() {