From cbb70ce070d220642b038ea101d9c0f9fbf860d6 Mon Sep 17 00:00:00 2001
From: dim <dim@FreeBSD.org>
Date: Sun, 20 Feb 2011 12:57:14 +0000
Subject: Vendor import of llvm trunk r126079:
http://llvm.org/svn/llvm-project/llvm/trunk@126079
---
lib/Support/Atomic.cpp | 112 +++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 112 insertions(+)
create mode 100644 lib/Support/Atomic.cpp
(limited to 'lib/Support/Atomic.cpp')
diff --git a/lib/Support/Atomic.cpp b/lib/Support/Atomic.cpp
new file mode 100644
index 0000000..c7b4bff
--- /dev/null
+++ b/lib/Support/Atomic.cpp
@@ -0,0 +1,112 @@
+//===-- Atomic.cpp - Atomic Operations --------------------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This header file implements atomic operations.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Support/Atomic.h"
+#include "llvm/Config/config.h"
+
+using namespace llvm;
+
+#if defined(_MSC_VER)
+#include <windows.h>
+#undef MemoryFence
+#endif
+
+void sys::MemoryFence() {
+#if LLVM_MULTITHREADED==0
+ return;
+#else
+# if defined(__GNUC__)
+ __sync_synchronize();
+# elif defined(_MSC_VER)
+ MemoryBarrier();
+# else
+# error No memory fence implementation for your platform!
+# endif
+#endif
+}
+
+sys::cas_flag sys::CompareAndSwap(volatile sys::cas_flag* ptr,
+ sys::cas_flag new_value,
+ sys::cas_flag old_value) {
+#if LLVM_MULTITHREADED==0
+ sys::cas_flag result = *ptr;
+ if (result == old_value)
+ *ptr = new_value;
+ return result;
+#elif defined(__GNUC__)
+ return __sync_val_compare_and_swap(ptr, old_value, new_value);
+#elif defined(_MSC_VER)
+ return InterlockedCompareExchange(ptr, new_value, old_value);
+#else
+# error No compare-and-swap implementation for your platform!
+#endif
+}
+
+sys::cas_flag sys::AtomicIncrement(volatile sys::cas_flag* ptr) {
+#if LLVM_MULTITHREADED==0
+ ++(*ptr);
+ return *ptr;
+#elif defined(__GNUC__)
+ return __sync_add_and_fetch(ptr, 1);
+#elif defined(_MSC_VER)
+ return InterlockedIncrement(ptr);
+#else
+# error No atomic increment implementation for your platform!
+#endif
+}
+
+sys::cas_flag sys::AtomicDecrement(volatile sys::cas_flag* ptr) {
+#if LLVM_MULTITHREADED==0
+ --(*ptr);
+ return *ptr;
+#elif defined(__GNUC__)
+ return __sync_sub_and_fetch(ptr, 1);
+#elif defined(_MSC_VER)
+ return InterlockedDecrement(ptr);
+#else
+# error No atomic decrement implementation for your platform!
+#endif
+}
+
+sys::cas_flag sys::AtomicAdd(volatile sys::cas_flag* ptr, sys::cas_flag val) {
+#if LLVM_MULTITHREADED==0
+ *ptr += val;
+ return *ptr;
+#elif defined(__GNUC__)
+ return __sync_add_and_fetch(ptr, val);
+#elif defined(_MSC_VER)
+ return InterlockedExchangeAdd(ptr, val) + val;
+#else
+# error No atomic add implementation for your platform!
+#endif
+}
+
+sys::cas_flag sys::AtomicMul(volatile sys::cas_flag* ptr, sys::cas_flag val) {
+ sys::cas_flag original, result;
+ do {
+ original = *ptr;
+ result = original * val;
+ } while (sys::CompareAndSwap(ptr, result, original) != original);
+
+ return result;
+}
+
+sys::cas_flag sys::AtomicDiv(volatile sys::cas_flag* ptr, sys::cas_flag val) {
+ sys::cas_flag original, result;
+ do {
+ original = *ptr;
+ result = original / val;
+ } while (sys::CompareAndSwap(ptr, result, original) != original);
+
+ return result;
+}
--
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