From b357121749c8103fec90a86a0b3ff1b47810aab5 Mon Sep 17 00:00:00 2001
From: Simon Renblad <srenblad@m-labs.hk>
Date: Mon, 6 Jan 2025 17:57:39 +0800
Subject: [PATCH] prevent vectorizing copy_work_buffer

---
 src/libboard_artiq/src/drtioaux.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/libboard_artiq/src/drtioaux.rs b/src/libboard_artiq/src/drtioaux.rs
index e86847b..ca94618 100644
--- a/src/libboard_artiq/src/drtioaux.rs
+++ b/src/libboard_artiq/src/drtioaux.rs
@@ -1,4 +1,5 @@
 use core::slice;
+use core::arch::asm;
 
 use core_io::{Error as IoError, ErrorKind as IoErrorKind};
 use crc;
@@ -39,6 +40,7 @@ pub fn copy_work_buffer(src: *mut u32, dst: *mut u32, len: isize) {
     // fix for artiq-zynq#344
     unsafe {
         for i in 0..(len / 4) {
+            asm!("", options(preserves_flags, nostack, readonly));
             *dst.offset(i) = *src.offset(i);
         }
     }