Clarify the description of the x86-64-vnni256 and x86-64-avxvnni architectures

Now it is clearly explained that "x86-64-vnni256" requires full
support of AVX512-VNNI, but only 256-bit operands are used.

closes https://github.com/official-stockfish/Stockfish/pull/4427

No functional change

diff --git a/AUTHORS b/AUTHORS
index 634de4a3d906102236195fe42133a1dd99d14566..49f7009f10b16adb29f6eb8f7135fdb286a5bb8e 100644 (file)
--- a/AUTHORS
+++ b/AUTHORS
@@ -134,6 +134,7 @@ Matt Ginsberg (mattginsberg)
 Matthew Lai (matthewlai)
 Matthew Sullivan (Matt14916)
 Max A. (Disservin)
+Maxim Masiutin (maximmasiutin)
 Maxim Molchanov (Maxim)
 Michael An (man)
 Michael Byrne (MichaelB7)

diff --git a/src/Makefile b/src/Makefile
index 3d6432fd96b033c9c6964f6b11b0768968f625ad..774ba6ea8c4b57991342591108cbf4c962c36b7e 100644 (file)
--- a/src/Makefile
+++ b/src/Makefile
@@ -92,7 +92,7 @@ VPATH = syzygy:nnue:nnue/features
 # avx2 = yes/no       --- -mavx2             --- Use Intel Advanced Vector Extensions 2
 # avxvnni = yes/no    --- -mavxvnni          --- Use Intel Vector Neural Network Instructions AVX
 # avx512 = yes/no     --- -mavx512bw         --- Use Intel Advanced Vector Extensions 512
-# vnni256 = yes/no    --- -mavx512vnni       --- Use Intel Vector Neural Network Instructions 256
+# vnni256 = yes/no    --- -mavx256vnni       --- Use Intel Vector Neural Network Instructions 512 with 256bit operands
 # vnni512 = yes/no    --- -mavx512vnni       --- Use Intel Vector Neural Network Instructions 512
 # neon = yes/no       --- -DUSE_NEON         --- Use ARM SIMD architecture
 # dotprod = yes/no    --- -DUSE_NEON_DOTPROD --- Use ARM advanced SIMD Int8 dot product instructions
@@ -773,10 +773,10 @@ help:
        @echo ""
        @echo "Supported archs:"
        @echo ""
-       @echo "x86-64-vnni512          > x86 64-bit with vnni support 512bit wide"
-       @echo "x86-64-vnni256          > x86 64-bit with vnni support 256bit wide"
+       @echo "x86-64-vnni512          > x86 64-bit with vnni 512bit support"
+       @echo "x86-64-vnni256          > x86 64-bit with vnni 512bit support, limit operands to 256bit wide"
        @echo "x86-64-avx512           > x86 64-bit with avx512 support"
-       @echo "x86-64-avxvnni          > x86 64-bit with avxvnni support"
+       @echo "x86-64-avxvnni          > x86 64-bit with vnni 256bit support"
        @echo "x86-64-bmi2             > x86 64-bit with bmi2 support"
        @echo "x86-64-avx2             > x86 64-bit with avx2 support"
        @echo "x86-64-sse41-popcnt     > x86 64-bit with sse41 and popcnt support"