From d50c16456e503a46580b7cf83e5a20186c99932c Mon Sep 17 00:00:00 2001
From: Nikolay Igotti <nikolay.igotti@jetbrains.com>
Date: Wed, 4 Jul 2018 02:55:47 +0300
Subject: [PATCH] Fix MIPS atomics.

---
 runtime/src/main/cpp/Atomic.cpp | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/runtime/src/main/cpp/Atomic.cpp b/runtime/src/main/cpp/Atomic.cpp
index 8b7b24be27e..4ec1f685f92 100644
--- a/runtime/src/main/cpp/Atomic.cpp
+++ b/runtime/src/main/cpp/Atomic.cpp
@@ -58,7 +58,21 @@ KLong Kotlin_AtomicLong_addAndGet(KRef thiz, KLong delta) {
 }
 
 KLong Kotlin_AtomicLong_compareAndSwap(KRef thiz, KLong expectedValue, KLong newValue) {
+#ifdef __mips
+    // Potentially huge performance penalty, but correct.
+    // TODO: reconsider, once target MIPS can do proper 64-bit CAS.
+    static int lock = 0;
+    while (compareAndSwap(&lock, 0, 1) != 0);
+    KLong* address = reinterpret_cast<KLong*>(thiz + 1);
+    KLong old = *address;
+    if (old == expectedValue) {
+      *address = newValue;
+    }
+    compareAndSwap(&lock, 1, 0);
+    return old;
+#else
     return compareAndSwapImpl(thiz, expectedValue, newValue);
+#endif
 }
 
 KNativePtr Kotlin_AtomicNativePtr_compareAndSwap(KRef thiz, KNativePtr expectedValue, KNativePtr newValue) {
@@ -87,4 +101,4 @@ OBJ_GETTER(Kotlin_AtomicReference_get, KRef thiz) {
     RETURN_RESULT_OF(ReadRefLocked, &ref->value_, &ref->lock_);
 }
 
-}  // extern "C"
\ No newline at end of file
+}  // extern "C"