From c1535c8ccfcb31008ce5528deeb2f206f95ce3c9 Mon Sep 17 00:00:00 2001
From: Jean-Marc Valin <jmvalin@jmvalin.ca>
Date: Thu, 24 Jun 2021 17:31:05 -0400
Subject: [PATCH] Adding option to disable int8 dot products

---
 dnn/configure.ac | 10 +++++++++-
 dnn/vec.h        |  2 ++
 dnn/vec_avx.h    |  2 ++
 dnn/vec_neon.h   |  2 ++
 4 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/dnn/configure.ac b/dnn/configure.ac
index 9efc10fe..fad54e27 100644
--- a/dnn/configure.ac
+++ b/dnn/configure.ac
@@ -73,6 +73,14 @@ AS_IF([test "$enable_assertions" = "yes"], [
   AC_DEFINE([OP_ENABLE_ASSERTIONS], [1], [Enable assertions in code])
 ])
 
+AC_ARG_ENABLE([dot-product],
+	      AS_HELP_STRING([--disable-dot-product], [Disable dot product implementation]),,
+  enable_dot_product=yes)
+
+AS_IF([test "$enable_dot_product" = "no"], [
+       AC_DEFINE([DISABLE_DOT_PROD], [1], [Disable dot product instructions])
+])
+
 AS_CASE(["$ac_cv_search_lrintf"],
   ["no"],[],
   ["none required"],[],
@@ -114,8 +122,8 @@ AC_MSG_NOTICE([
 ------------------------------------------------------------------------
   $PACKAGE_NAME $PACKAGE_VERSION: Automatic configuration OK.
 
+    Dot product intrinsics ....... ${enable_dot_product}
     Assertions ................... ${enable_assertions}
-
     Hidden visibility ............ ${cc_cv_flag_visibility}
 
     API documentation ............ ${enable_doc}
diff --git a/dnn/vec.h b/dnn/vec.h
index dbf50587..ef44cba5 100644
--- a/dnn/vec.h
+++ b/dnn/vec.h
@@ -45,8 +45,10 @@
 
 #define NO_OPTIMIZATIONS
 
+#ifndef DISABLE_DOT_PROD
 #define DOT_PROD
 //#define USE_SU_BIAS
+#endif
 
 #ifdef DOT_PROD
 typedef signed char qweight;
diff --git a/dnn/vec_avx.h b/dnn/vec_avx.h
index 53c725ff..ad39d0f7 100644
--- a/dnn/vec_avx.h
+++ b/dnn/vec_avx.h
@@ -34,8 +34,10 @@
 
 #include <immintrin.h>
 
+#ifndef DISABLE_DOT_PROD
 #define DOT_PROD
 #define USE_SU_BIAS
+#endif
 
 #ifdef __AVX2__
 static inline __m256 exp8_approx(__m256 X)
diff --git a/dnn/vec_neon.h b/dnn/vec_neon.h
index 39432232..1209b760 100644
--- a/dnn/vec_neon.h
+++ b/dnn/vec_neon.h
@@ -30,7 +30,9 @@
 
 #include <arm_neon.h>
 
+#ifndef DISABLE_DOT_PROD
 #define DOT_PROD
+#endif
 typedef signed char qweight;