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Support VNNI on 256bit vectors

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due to downclocking on current chips (tested up to cascade lake)
supporting avx512 and vnni512, it is better to use avx2 or vnni256
in multithreaded (in particular hyperthreaded) engine use.
In single threaded use, the picture is different.

gcc compilation for vnni256 requires a toolchain for gcc >= 9.

closes https://github.com/official-stockfish/Stockfish/pull/3038

No functional change
This commit is contained in:
mstembera
2020-08-20 16:59:27 -07:00
committed by Joost VandeVondele
parent e453f09f06
commit 701b2427bd
3 changed files with 42 additions and 11 deletions
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39
src/Makefile
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@@ -75,7 +75,8 @@ endif
# sse41 = yes/no --- -msse4.1 --- Use Intel Streaming SIMD Extensions 4.1
# avx2 = yes/no --- -mavx2 --- Use Intel Advanced Vector Extensions 2
# avx512 = yes/no --- -mavx512bw --- Use Intel Advanced Vector Extensions 512
# vnni = yes/no --- -mavx512vnni --- Use Intel Vector Neural Network Instructions 512
# vnni256 = yes/no --- -mavx512vnni --- Use Intel Vector Neural Network Instructions 256
# vnni512 = yes/no --- -mavx512vnni --- Use Intel Vector Neural Network Instructions 512
# neon = yes/no --- -DUSE_NEON --- Use ARM SIMD architecture
#
# Note that Makefile is space sensitive, so when adding new architectures
@@ -102,7 +103,8 @@ ssse3 = no
sse41 = no
avx2 = no
avx512 = no
vnni = no
vnni256 = no
vnni512 = no
neon = no
ARCH = x86-64-modern
STRIP = strip
@@ -192,7 +194,18 @@ ifeq ($(findstring -avx512,$(ARCH)),-avx512)
avx512 = yes
endif
ifeq ($(findstring -vnni,$(ARCH)),-vnni)
ifeq ($(findstring -vnni256,$(ARCH)),-vnni256)
popcnt = yes
sse = yes
sse2 = yes
ssse3 = yes
sse41 = yes
avx2 = yes
pext = yes
vnni256 = yes
endif
ifeq ($(findstring -vnni512,$(ARCH)),-vnni512)
popcnt = yes
sse = yes
sse2 = yes
@@ -201,7 +214,7 @@ ifeq ($(findstring -vnni,$(ARCH)),-vnni)
avx2 = yes
pext = yes
avx512 = yes
vnni = yes
vnni512 = yes
endif
ifeq ($(sse),yes)
@@ -500,7 +513,14 @@ ifeq ($(avx512),yes)
endif
endif
ifeq ($(vnni),yes)
ifeq ($(vnni256),yes)
CXXFLAGS += -DUSE_VNNI
ifeq ($(comp),$(filter $(comp),gcc clang mingw))
CXXFLAGS += -mavx512vnni -mavx512dq -mavx512vl -mprefer-vector-width=256
endif
endif
ifeq ($(vnni512),yes)
CXXFLAGS += -DUSE_VNNI
ifeq ($(comp),$(filter $(comp),gcc clang mingw))
CXXFLAGS += -mavx512vnni -mavx512dq -mavx512vl
@@ -623,7 +643,8 @@ help:
@echo ""
@echo "Supported archs:"
@echo ""
@echo "x86-64-vnni > x86 64-bit with vnni support"
@echo "x86-64-vnni512 > x86 64-bit with vnni support 512bit wide"
@echo "x86-64-vnni256 > x86 64-bit with vnni support 256bit wide"
@echo "x86-64-avx512 > x86 64-bit with avx512 support"
@echo "x86-64-bmi2 > x86 64-bit with bmi2 support"
@echo "x86-64-avx2 > x86 64-bit with avx2 support"
@@ -767,7 +788,8 @@ config-sanity:
@echo "sse41: '$(sse41)'"
@echo "avx2: '$(avx2)'"
@echo "avx512: '$(avx512)'"
@echo "vnni: '$(vnni)'"
@echo "vnni256: '$(vnni256)'"
@echo "vnni512: '$(vnni512)'"
@echo "neon: '$(neon)'"
@echo ""
@echo "Flags:"
@@ -794,7 +816,8 @@ config-sanity:
@test "$(sse41)" = "yes" || test "$(sse41)" = "no"
@test "$(avx2)" = "yes" || test "$(avx2)" = "no"
@test "$(avx512)" = "yes" || test "$(avx512)" = "no"
@test "$(vnni)" = "yes" || test "$(vnni)" = "no"
@test "$(vnni256)" = "yes" || test "$(vnni256)" = "no"
@test "$(vnni512)" = "yes" || test "$(vnni512)" = "no"
@test "$(neon)" = "yes" || test "$(neon)" = "no"
@test "$(comp)" = "gcc" || test "$(comp)" = "icc" || test "$(comp)" = "mingw" || test "$(comp)" = "clang" \
|| test "$(comp)" = "armv7a-linux-androideabi16-clang" || test "$(comp)" = "aarch64-linux-android21-clang"