Use compiler intrinsic instead of assembly for popcnt

No functional change.

diff --git a/src/Makefile b/src/Makefile
index 187e7b3..562192c 100644 (file)
--- a/src/Makefile
+++ b/src/Makefile
@@ -285,7 +285,7 @@ endif
 
 ### 3.9 popcnt
 ifeq ($(popcnt),yes)
-       CXXFLAGS += -msse3 -DUSE_POPCNT
+       CXXFLAGS += -msse4.2 -DUSE_POPCNT
 endif
 
 ### 3.10 pext

diff --git a/src/bitcount.h b/src/bitcount.h
index f84c51c..9feed19 100644 (file)
--- a/src/bitcount.h
+++ b/src/bitcount.h
@@ -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
 }