From: disservin <disservin.social@gmail.com>
Date: Sun, 16 Oct 2022 12:37:01 +0000 (+0200)
Subject: enable bit manipulation instruction set 1
X-Git-Url: http://winboard.nl/cgi-bin?a=commitdiff_plain;h=f34d635ac85f51f095faa104198a7c309fa9a603;p=fairystockfish.git

enable bit manipulation instruction set 1

bmi1 enables the use of _blsr_u64 for pop_lsb, and is availabe when avx2 is.

verified a small speedup (0.2 - 0.6%)

closes https://github.com/official-stockfish/Stockfish/pull/4202

No functional change
---

diff --git a/src/Makefile b/src/Makefile
index f764596..3584386 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -571,7 +571,7 @@ endif
 ifeq ($(avx2),yes)
 	CXXFLAGS += -DUSE_AVX2
 	ifeq ($(comp),$(filter $(comp),gcc clang mingw))
-		CXXFLAGS += -mavx2
+		CXXFLAGS += -mavx2 -mbmi
 	endif
 endif