Add an atomic increment and decrement implementation, which will be used for
thread-safe reference counting.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73587 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/configure b/configure
index 7fdb067..6920d6d 100755
--- a/configure
+++ b/configure
@@ -33760,6 +33760,8 @@
volatile unsigned long val = 1;
__sync_synchronize();
__sync_val_compare_and_swap(&val, 1, 0);
+ __sync_add_and_fetch(&val, 1);
+ __sync_sub_and_fetch(&val, 1);
return 0;
}