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Use compiler intrinsic instead of assembly for popcnt

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This time, do not break compatibility with some AMD machines that have SSE3 and popcnt, but do
not have SSE4.2.

No functional change.
This commit is contained in:
lucasart 2014-07-03 18:22:53 +08:00
parent b9a88da4ab
commit 85b08ce3ad
2 changed files with 2 additions and 3 deletions
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2
src/Makefile
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@ -285,7 +285,7 @@ endif
### 3.9 popcnt
ifeq ($(popcnt),yes)
CXXFLAGS += -msse3 -DUSE_POPCNT
CXXFLAGS += -msse3 -mpopcnt -DUSE_POPCNT
endif
### 3.10 pext

3
src/bitcount.h
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@ -96,8 +96,7 @@ inline int popcount<CNT_HW_POPCNT>(Bitboard b) {
#else
__asm__("popcnt %1, %0" : "=r" (b) : "r" (b));
return b;
return __builtin_popcountll(b);
#endif
}