From: Gary Linscott <glinscott@gmail.com>
Date: Tue, 1 Jul 2014 21:01:54 +0000 (-0400)
Subject: Revert "Use compiler intrinsic instead of assembly for popcnt"
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=b9a88da4abe9a673e8ad0d254d7196da9623e54a

Revert "Use compiler intrinsic instead of assembly for popcnt"

This reverts commit a69f1d7c2060dc7b320a7b4801105df00b22a96a.
---

diff --git a/src/Makefile b/src/Makefile
index 562192ca..187e7b31 100644
--- 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
index 9feed19f..f84c51cb 100644
--- 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
 }