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Fix a data race for NNUE

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the stateInfo at the rootPos is no longer read-only, as the NNUE accumulator is part of it.
Threads can thus not share this object and need their own copy.

tested for no regression
https://tests.stockfishchess.org/tests/view/5f3022239081672066536bce
LLR: 2.96 (-2.94,2.94) {-1.50,0.50}
Total: 52800 W: 6843 L: 6802 D: 39155
Ptnml(0-2): 336, 4646, 16399, 4679, 340

closes https://github.com/official-stockfish/Stockfish/pull/2957

fixes https://github.com/official-stockfish/Stockfish/issues/2933

No functional change
This commit is contained in:
Joost VandeVondele
2020-08-09 18:11:38 +02:00
parent a6e89293df
commit 27b593a944
3 changed files with 8 additions and 10 deletions
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src/Makefile
+2 -2
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@@ -354,8 +354,8 @@ endif
endif
ifeq ($(KERNEL),Darwin)
CXXFLAGS += -arch $(arch) -mmacosx-version-min=10.13
LDFLAGS += -arch $(arch) -mmacosx-version-min=10.13
CXXFLAGS += -arch $(arch) -mmacosx-version-min=10.14
LDFLAGS += -arch $(arch) -mmacosx-version-min=10.14
endif
### Travis CI script uses COMPILER to overwrite CXX