1 files changed, 23 insertions, 0 deletions
diff --git a/lib/builtins/bswapsi2.c b/lib/builtins/bswapsi2.c
new file mode 100644
index 0000000000000..5d941e69f7c46
--- /dev/null
+++ b/lib/builtins/bswapsi2.c
@@ -0,0 +1,23 @@
+/* ===-- bswapsi2.c - Implement __bswapsi2 ---------------------------------===
+ *
+ *               The LLVM Compiler Infrastructure
+ *
+ * This file is dual licensed under the MIT and the University of Illinois Open
+ * Source Licenses. See LICENSE.TXT for details.
+ *
+ * ===----------------------------------------------------------------------===
+ *
+ * This file implements __bswapsi2 for the compiler_rt library.
+ *
+ * ===----------------------------------------------------------------------===
+ */
+
+#include "int_lib.h"
+
+COMPILER_RT_ABI uint32_t __bswapsi2(uint32_t u) {
+  return (
+      (((u)&0xff000000) >> 24) |
+      (((u)&0x00ff0000) >> 8)  |
+      (((u)&0x0000ff00) << 8)  |
+      (((u)&0x000000ff) << 24));
+}