From 145e4c2a1006a629327dbd83ffbc7c112f8b8dfc Mon Sep 17 00:00:00 2001
From: joergoster <osterj165@googlemail.com>
Date: Wed, 1 Jul 2020 14:14:27 +0200
Subject: [PATCH] Add SSE41 switch. This allows building modern compiles with
 SSE41 enabled, which gives a nice speedup on my Bulldozer CPU.

For example:
make nnue ARCH=x86-64-modern sse41=yes -j
---
 src/Makefile | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/Makefile b/src/Makefile
index 24a62826..5c8a7a90 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -386,6 +386,13 @@ ifeq ($(avx2),yes)
 	endif
 endif
 
+ifeq ($(sse41),yes)
+	CXXFLAGS += -DUSE_SSE41
+	ifeq ($(comp),$(filter $(comp),gcc clang mingw msys2))
+		CXXFLAGS += -msse4
+	endif
+endif
+
 ### 3.7 pext
 ifeq ($(pext),yes)
 	CXXFLAGS += -DUSE_PEXT