Add prefetch to mpscq.

CTSRD-CHERI · Jul 2, 2019 · fdcbcf7 · fdcbcf7
1 parent daebe3f
commit fdcbcf7
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Showing 2 changed files with 10 additions and 0 deletions.
diff --git a/src/ds/bits.h b/src/ds/bits.h
@@ -136,6 +136,15 @@ namespace snmalloc
 #endif
     }
 
+    inline void prefetch(void* ptr)
+    {
+#if defined(PLATFORM_IS_X86)
+      _mm_prefetch(reinterpret_cast<const char *>(ptr), _MM_HINT_T0);
+#else
+#  warning "Missing pause intrinsic"
+#endif
+    }
+
     inline uint64_t tick()
     {
 #if defined(PLATFORM_IS_X86)

diff --git a/src/ds/mpscq.h b/src/ds/mpscq.h
@@ -71,6 +71,7 @@ namespace snmalloc
       if (next != nullptr)
       {
         front = next;
+        bits::prefetch(&(next->next));
         assert(front);
         std::atomic_thread_fence(std::memory_order_acquire);
         invariant();