From c245c83be1ce004ee94a0dbd2815b424cc40f5cd Mon Sep 17 00:00:00 2001
From: Mark Peerdeman <mark.peerdeman@leaningtech.com>
Date: Thu, 8 Feb 2024 13:29:58 +0100
Subject: [PATCH] Set max bitwidths for atomic operations

---
 clang/lib/Basic/Targets/WebAssembly.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/clang/lib/Basic/Targets/WebAssembly.h b/clang/lib/Basic/Targets/WebAssembly.h
index cd7d2a7e8c03..52f36e8ba26a 100644
--- a/clang/lib/Basic/Targets/WebAssembly.h
+++ b/clang/lib/Basic/Targets/WebAssembly.h
@@ -212,6 +212,8 @@ class CheerpTargetInfo : public TargetInfo {
     LongDoubleWidth = LongDoubleAlign = 64;
     LongDoubleFormat = &llvm::APFloat::IEEEdouble();
     SizeType = UnsignedInt;
+    // We define these as 32-bit for now, since AsmJS cannot handle 64-bit atomic operations currently.
+    MaxAtomicPromoteWidth = MaxAtomicInlineWidth = 32;
 
     // Use 32-bit integers for two separated bit fields.
     UseBitFieldTypeAlignment = true;