From ecfae949b68b69cb97b5e9015e3a2bc2bc01c3ec Mon Sep 17 00:00:00 2001
From: rymrg <54061433+rymrg@users.noreply.github.com>
Date: Tue, 19 Jan 2021 12:23:59 +0200
Subject: [PATCH] Add support for atomicFetchAdd and atomicFetchSub

---
 src/core/internal/atomic.d | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/core/internal/atomic.d b/src/core/internal/atomic.d
index fb21eb381e..dbc235c5e8 100644
--- a/src/core/internal/atomic.d
+++ b/src/core/internal/atomic.d
@@ -32,6 +32,18 @@ version (LDC)
         llvm_atomic_store!A(*cast(A*) &value, cast(shared A*) dest, _ordering!(order));
     }
 
+    T atomicFetchAdd(MemoryOrder order = MemoryOrder.seq, T)(T* dest, T value) pure nothrow @nogc @trusted
+    {
+        alias A = _AtomicType!T;
+        return llvm_atomic_rmw_add!A(cast(shared A*) dest, value, _ordering!(order));
+    }
+
+    T atomicFetchSub(MemoryOrder order = MemoryOrder.seq, T)(T* dest, T value) pure nothrow @nogc @trusted
+    {
+        alias A = _AtomicType!T;
+        return llvm_atomic_rmw_sub!A(cast(shared A*) dest, value, _ordering!(order));
+    }
+
     T atomicExchange(MemoryOrder order = MemoryOrder.seq, bool result = true, T)(T* dest, T value) pure nothrow @nogc @trusted
     {
         alias A = _AtomicType!T;