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Remove x86-64-vnni256 target

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When vnni256 was first introduced #3038 it was very slightly faster than vnni512
on some machines. We have since sped up vnni512 significantly (#4796 over 10%
alone, #6139, and probably others I'm forgetting). Since any machine that can
run vnni256 can run vnni512 this arch is no longer useful.

Note, x86-64-avxvnni still covers targets that don't have AVX512 but do have
VNNI on 128- and 256-bit vectors.

closes https://github.com/official-stockfish/Stockfish/pull/6340

No functional change
This commit is contained in:
mstembera
2025-10-04 15:12:25 -07:00
committed by Joost VandeVondele
parent e5c2dc5edd
commit ee243f0fdc
3 changed files with 4 additions and 46 deletions
Download Patch File Download Diff File Expand all files Collapse all files
scripts/get_native_properties.sh
+2 -2
View File
@@ -42,7 +42,7 @@ set_arch_x86_64() {
if check_flags 'avx512f' 'avx512cd' 'avx512vl' 'avx512dq' 'avx512bw' 'avx512ifma' 'avx512vbmi' 'avx512vbmi2' 'avx512vpopcntdq' 'avx512bitalg' 'avx512vnni' 'vpclmulqdq' 'gfni' 'vaes'; then
true_arch='x86-64-avx512icl'
elif check_flags 'avx512vnni' 'avx512dq' 'avx512f' 'avx512bw' 'avx512vl'; then
true_arch='x86-64-vnni256'
true_arch='x86-64-vnni512'
elif check_flags 'avx512f' 'avx512bw'; then
true_arch='x86-64-avx512'
elif [ -z "${znver_1_2+1}" ] && check_flags 'bmi2'; then
@@ -83,7 +83,7 @@ case $uname_s in
'x86_64')
flags=$(sysctl -n machdep.cpu.features machdep.cpu.leaf7_features | tr '\n' ' ' | tr '[:upper:]' '[:lower:]' | tr -d '_.')
set_arch_x86_64
if [ "$true_arch" = 'x86-64-vnni256' ] || [ "$true_arch" = 'x86-64-avx512' ]; then
if [ "$true_arch" = 'x86-64-avx512' ]; then
file_arch='x86-64-bmi2'
fi
;;