Revert "Use compiler intrinsic instead of assembly for popcnt"

This reverts commit a69f1d7.
official-stockfish · Jul 1, 2014 · b9a88da · b9a88da
1 parent a69f1d7
commit b9a88da
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Showing 2 changed files with 3 additions and 2 deletions.
diff --git a/src/Makefile b/src/Makefile
@@ -285,7 +285,7 @@ endif
 
 ### 3.9 popcnt
 ifeq ($(popcnt),yes)
-	CXXFLAGS += -msse4.2 -DUSE_POPCNT
+	CXXFLAGS += -msse3 -DUSE_POPCNT
 endif
 
 ### 3.10 pext

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