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Enable New Pass Manager for Clang.

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It's about 1% speedup for Stockfish.

Result of 100 runs
==================
base (...fish_clang12) =    1946851  +/- 3717
test (./stockfish    ) =    1967276  +/- 3408
diff                   =     +20425  +/- 2438

speedup        = +0.0105
P(speedup > 0) =  1.0000

Thanks to David Major for making me aware of this part
of LLVM development.

closes https://github.com/official-stockfish/Stockfish/pull/3346

No functional change
This commit is contained in:
Gian-Carlo Pascutto
2021-02-09 17:38:58 +01:00
committed by Joost VandeVondele
parent b15e3b3fa9
commit 550fed3343
1 changed files with 4 additions and 0 deletions
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4
src/Makefile
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@@ -481,6 +481,10 @@ ifeq ($(optimize),yes)
CXXFLAGS += -mdynamic-no-pic
endif
endif
ifeq ($(comp),clang)
CXXFLAGS += -fexperimental-new-pass-manager
endif
endif
### 3.4 Bits