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support popcnt on armv8

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* Supports popcnt (thanks @daylen)
* bits = 64 is now the default

Tested with g++ (Ubuntu/Linaro 7.5.0-3ubuntu1~18.04) 7.5.0 on ThunderX CN8890,
yields about 9% speedup.

Also tested with clang version 6.0.0-1ubuntu2 (tags/RELEASE_600/final).

closes https://github.com/official-stockfish/Stockfish/pull/2770

No functional change.
This commit is contained in:
Niklas Fiekas
2020-06-25 12:42:25 +02:00
committed by Joost VandeVondele
parent a84e3ac287
commit aecfca2dc2
1 changed files with 2 additions and 2 deletions
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4
src/Makefile
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@@ -134,8 +134,8 @@ endif
ifeq ($(ARCH),armv8)
arch = armv8-a
bits = 64
prefetch = yes
popcnt = yes
endif
ifeq ($(ARCH),ppc-32)
@@ -322,7 +322,7 @@ endif
### 3.6 popcnt
ifeq ($(popcnt),yes)
ifeq ($(arch),ppc64)
ifeq ($(arch),$(filter $(arch),ppc64 armv8-a))
CXXFLAGS += -DUSE_POPCNT
else ifeq ($(comp),icc)
CXXFLAGS += -msse3 -DUSE_POPCNT