From 4d487cea1fd210bf7d57156628609aec7fd309ca Mon Sep 17 00:00:00 2001
From: Dustin Brody <tersec@users.noreply.github.com>
Date: Wed, 5 Feb 2020 18:20:05 +0100
Subject: [PATCH] build with -march=native by default

---
 nim.cfg | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/nim.cfg b/nim.cfg
index e2a06a516..156531911 100644
--- a/nim.cfg
+++ b/nim.cfg
@@ -21,6 +21,13 @@
   -d:"chronicles_colors=off"
 @end
 
+# This helps especially for 32-bit x86, which sans SSE2 and newer instructions
+# requires quite roundabout code generation for cryptography, and other 64-bit
+# and larger arithmetic use cases, along with register starvation issues. When
+# engineering a more portable binary release, this should be tweaked but still
+# use at least -msse2 or -msse3.
+--passC:"-march=native"
+
 --threads:on
 --opt:speed
 --excessiveStackTrace:on