From 877d9e50928e9686add1d5e55747e7ecff0312ce Mon Sep 17 00:00:00 2001
From: Yann Collet <yann.collet.73@gmail.com>
Date: Thu, 26 Dec 2024 15:25:51 -0800
Subject: [PATCH] enable runtime detection of vector extension on x86/64 target

---
 Makefile | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Makefile b/Makefile
index 3ffd593b..d32154ee 100644
--- a/Makefile
+++ b/Makefile
@@ -55,6 +55,13 @@ else
 EXT =
 endif
 
+# automatically enable runtime vector dispatch on x86/64 targets
+detect_x86_arch = $(shell $(CC) -dumpmachine | grep -E 'i[3-6]86|x86_64')
+ifneq ($(strip $(call detect_x86_arch)),)
+    #note: can be overridden at compile time, by setting DISPATCH=0
+    DISPATCH ?= 1
+endif
+
 ifeq ($(NODE_JS),1)
     # Link in unrestricted filesystem support
     LDFLAGS += -sNODERAWFS