From a52907947d3883c63c37831d7d05ba7ded12ac26 Mon Sep 17 00:00:00 2001
From: Mark Rousskov <mark.simulacrum@gmail.com>
Date: Tue, 15 Feb 2022 21:50:35 -0500
Subject: [PATCH] Document target_has_atomic

---
 src/conditional-compilation.md | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/src/conditional-compilation.md b/src/conditional-compilation.md
index 8085cbfab..a94db5b57 100644
--- a/src/conditional-compilation.md
+++ b/src/conditional-compilation.md
@@ -191,6 +191,23 @@ Example values:
 * `"pc"`
 * `"unknown"`
 
+### `target_has_atomic`
+
+Key-value option set for each bit width that the target supports
+atomic loads, stores, and compare-and-swap operations.
+
+Notably, this does not mean that the alignment of atomics matches that of equal
+bit width integers.
+
+Possible values:
+
+* `"8"`
+* `"16"`
+* `"32"`
+* `"64"`
+* `"128"`
+* `"ptr"`
+
 ### `test`
 
 Enabled when compiling the test harness. Done with `rustc` by using the