From 9d6db573e265e2d01d5879adfb0f22b9768a6828 Mon Sep 17 00:00:00 2001
From: iximeow <me@iximeow.net>
Date: Sun, 17 Mar 2024 09:26:49 +0000
Subject: differential tests: RUSTFLAGS on aarch64 note

---
 differential-tests/README.md | 3 +++
 1 file changed, 3 insertions(+)
 create mode 100644 differential-tests/README.md

diff --git a/differential-tests/README.md b/differential-tests/README.md
new file mode 100644
index 0000000..e6e39d8
--- /dev/null
+++ b/differential-tests/README.md
@@ -0,0 +1,3 @@
+on aarch64 you really want `RUSTFLAGS="-C target-feature=+lse"` (if your aarch64 target supports armv8.1).
+
+without +lse you'll get outlined atomics for the per-thread atomic add/stat tracking, which means each atomic add is a call/feature test/return instead of ... just the op.
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