[cairo-atomic] Add a few more cpus that are known to have atomic access.

Add x86_64 and arm to the list of cpus which do not require memory
barriers for reading and writing integers/pointers atomically.

1 files changed, 6 insertions, 0 deletions

diff --git a/configure.in b/configure.in
index 7fbe408..8b433fc 100644
--- a/configure.in
+++ b/configure.in
@@ -108,6 +108,12 @@ case $host_cpu in
     i?86)
 	cairo_atomic_op_needs_memory_barrier="no"
 	;;
+    x86_64)
+	cairo_atomic_op_needs_memory_barrier="no"
+	;;
+    arm*)
+	cairo_atomic_op_needs_memory_barrier="no"
+	;;
     *)
 	cairo_atomic_op_needs_memory_barrier="yes"
 	;;