From 84e5cac70ae394d708614016db20eb0cfbe82ec2 Mon Sep 17 00:00:00 2001
From: Owen Anderson <resistor@mac.com>
Date: Tue, 19 May 2009 01:08:36 +0000
Subject: [PATCH] Make using an unsupported CAS size a hard error on Windows.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72088 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/System/Atomic.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/llvm/System/Atomic.h b/include/llvm/System/Atomic.h
index 5bdbaffe023..5830b37083b 100644
--- a/include/llvm/System/Atomic.h
+++ b/include/llvm/System/Atomic.h
@@ -68,8 +68,10 @@ namespace llvm {
 			    T old_value) {
       if (sizeof(T) == 4)
 	return InterlockedCompareExchange(ptr, new_value, old_value);
-      else
+      else if (sizeof(T) == 8)
 	return InterlockedCompareExchange64(ptr, new_value, old_value);
+      else
+	assert(0 && "Unsupported compare-and-swap size!");
     }
     
     template<typename T>