From 01c2e0fde95433ad2206dcf554418754c657d1b2 Mon Sep 17 00:00:00 2001
From: Michael Gottesman <mgottesman@apple.com>
Date: Fri, 14 Nov 2025 15:08:01 -0800
Subject: [PATCH] [irgen] Make AsyncLetBegin and AsyncLetFinish
 UNKNOWN_MEMEFFECTS instead of ArgMemOnly.

In a discussion with @rjmccall, we agreed that these should really be
UNKNOWN_MEMEFFECTS so we are conservative.

Just slicing this off from a larger patch stream.
---
 include/swift/Runtime/RuntimeFunctions.def | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/swift/Runtime/RuntimeFunctions.def b/include/swift/Runtime/RuntimeFunctions.def
index e82edee616fba..c0b55cf61be3f 100644
--- a/include/swift/Runtime/RuntimeFunctions.def
+++ b/include/swift/Runtime/RuntimeFunctions.def
@@ -2570,7 +2570,7 @@ FUNCTION(AsyncLetBegin,
          ),
          ATTRS(NoUnwind),
          EFFECT(RuntimeEffect::Concurrency),
-         MEMEFFECTS(ArgMemOnly))
+         UNKNOWN_MEMEFFECTS)
 
 /// void swift_asyncLet_finish(
 ///     AsyncLet *alet,
@@ -2592,7 +2592,7 @@ FUNCTION(AsyncLetFinish,
          ),
          ATTRS(NoUnwind),
          EFFECT(RuntimeEffect::Concurrency),
-         MEMEFFECTS(ArgMemOnly))
+         UNKNOWN_MEMEFFECTS)
 
 /// void swift_task_run_inline(
 ///     OpaqueValue *result,