From 8009973381f1064ea72e9533808166dd54a5445b Mon Sep 17 00:00:00 2001
From: Tomasz Sobczyk <tomasz.sobczyk1997@gmail.com>
Date: Wed, 25 Nov 2020 22:13:11 +0100
Subject: [PATCH] Special case for alpha=1 in saxpy, slight performance
 increase.

---
 src/extra/stockfish_blas.cpp | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/src/extra/stockfish_blas.cpp b/src/extra/stockfish_blas.cpp
index 2bf28b8f..70b258bc 100644
--- a/src/extra/stockfish_blas.cpp
+++ b/src/extra/stockfish_blas.cpp
@@ -177,10 +177,19 @@ namespace Blas {
         float * SF_BLAS_RESTRICT Y
     )
     {
-
-        for(int i = 0; i < N; ++i)
+        if (alpha == 1.0f)
         {
-            Y[i] += X[i] * alpha;
+            for (int i = 0; i < N; ++i)
+            {
+                Y[i] += X[i];
+            }
+        }
+        else
+        {
+            for (int i = 0; i < N; ++i)
+            {
+                Y[i] += X[i] * alpha;
+            }
         }
 
     }