Support L1 cache line size up to 256 bytes.

max0x7ba · Oct 21, 2021 · e50e567 · e50e567
1 parent f2a36a3
commit e50e567
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Showing 2 changed files with 10 additions and 8 deletions.
diff --git a/include/atomic_queue/atomic_queue.h b/include/atomic_queue/atomic_queue.h
@@ -29,12 +29,14 @@ namespace details {
 ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 
 template<size_t elements_per_cache_line> struct GetCacheLineIndexBits { static int constexpr value = 0; };
-template<> struct GetCacheLineIndexBits<64> { static int constexpr value = 6; };
-template<> struct GetCacheLineIndexBits<32> { static int constexpr value = 5; };
-template<> struct GetCacheLineIndexBits<16> { static int constexpr value = 4; };
-template<> struct GetCacheLineIndexBits< 8> { static int constexpr value = 3; };
-template<> struct GetCacheLineIndexBits< 4> { static int constexpr value = 2; };
-template<> struct GetCacheLineIndexBits< 2> { static int constexpr value = 1; };
+template<> struct GetCacheLineIndexBits<256> { static int constexpr value = 8; };
+template<> struct GetCacheLineIndexBits<128> { static int constexpr value = 7; };
+template<> struct GetCacheLineIndexBits< 64> { static int constexpr value = 6; };
+template<> struct GetCacheLineIndexBits< 32> { static int constexpr value = 5; };
+template<> struct GetCacheLineIndexBits< 16> { static int constexpr value = 4; };
+template<> struct GetCacheLineIndexBits<  8> { static int constexpr value = 3; };
+template<> struct GetCacheLineIndexBits<  4> { static int constexpr value = 2; };
+template<> struct GetCacheLineIndexBits<  2> { static int constexpr value = 1; };
 
 template<bool minimize_contention, unsigned array_size, size_t elements_per_cache_line>
 struct GetIndexShuffleBits {

diff --git a/src/tests.cc b/src/tests.cc
@@ -156,7 +156,7 @@ BOOST_AUTO_TEST_CASE(try_push) {
       /* SPSC = */ true
       >;
 
-    constexpr unsigned CAPACITY = 4096;
+    constexpr unsigned CAPACITY = CACHE_LINE_SIZE * CACHE_LINE_SIZE;
     Queue q(CAPACITY);
     BOOST_CHECK_EQUAL(q.capacity(), CAPACITY);
     BOOST_CHECK(q.was_empty());
@@ -177,7 +177,7 @@ BOOST_AUTO_TEST_CASE(try_push) {
 
 BOOST_AUTO_TEST_CASE(size) {
     atomic_queue::RetryDecorator<atomic_queue::AtomicQueueB2<float>> q(10);
-    BOOST_CHECK_EQUAL(q.capacity(), 4096);
+    BOOST_CHECK_EQUAL(q.capacity(), CACHE_LINE_SIZE * CACHE_LINE_SIZE);
 }
 
 BOOST_AUTO_TEST_CASE(power_of_2) {