From 308ca9fac150cd28d62afef852f26ae4c40fa5a0 Mon Sep 17 00:00:00 2001
From: Tom Smeding <tom@tomsmeding.com>
Date: Fri, 14 Mar 2025 21:57:05 +0100
Subject: Provide +nonportable-simd flag

---
 ox-arrays.cabal | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/ox-arrays.cabal b/ox-arrays.cabal
index 1253956..19a61ab 100644
--- a/ox-arrays.cabal
+++ b/ox-arrays.cabal
@@ -17,6 +17,16 @@ flag trace-wrappers
   default: False
   manual: True
 
+flag nonportable-simd
+  description:
+    Assume the binary will be run on the same CPU as where it is built. Setting
+    this flag causes `-march=native` to be passed to the C compiler when
+    compiling arithmetic operations. The result is generally much faster
+    arithmetic operations, but the executable is much less portable to
+    different computers.
+  default: False
+  manual: True
+
 library
   exposed-modules:
     Data.Array.Mixed.Internal.Arith
@@ -53,7 +63,9 @@ library
   c-sources: cbits/arith.c
 
   cc-options: -O3 -Wall -Wextra -std=c99
-  if arch(x86_64) || arch(i386)
+  if flag(nonportable-simd)
+    cc-options: -march=native
+  elif arch(x86_64) || arch(i386)
     -- hmatrix assumes sse2, so we can too
     cc-options: -msse2
 
-- 
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